Patent Publication Number: US-2022240289-A1

Title: Cbg based transmission in multiple pdsch scheduling

Description:
TECHNICAL FIELD 
     This disclosure pertains to wireless communication technology, in particular for high frequencies. 
     BACKGROUND 
     For future wireless communication systems, use of higher frequencies is considered, which allows large bandwidths to be used for communication. However, use of such higher frequencies brings new problems, for example regarding physical properties and timing. Ubiquitous or almost ubiquitous use of beamforming, with often comparatively small beams, may provide additional complications that need to be addressed. 
     SUMMARY 
     It is an object of this disclosure to provide improved approaches of handling wireless communication, in particular of data signaling. The approaches are particularly suitable for millimeter wave communication, in particular for radio carrier frequencies around and/or above 52.6 GHz, which may be considered high radio frequencies (high frequency) and/or millimeter waves. The carrier frequency/ies may be between 52.6 and 140 GHz, e.g. with a lower border between 52.6, 55, 60, 71 GHz and/or a higher border between 71, 72, 90, 114, 140 GHz or higher, in particular between 55 and 90 GHz, or between 60 and 72 GHz; however, higher frequencies may be considered. The carrier frequency may in particular refer to a center frequency or maximum frequency of the carrier. The radio nodes and/or network described herein may operate in wideband, e.g. with a carrier bandwidth of 1 GHz or more, or 2 GHz or more, or even larger, e.g. up to 8 GHz; the scheduled or allocated bandwidth may be the carrier bandwidth, or be smaller, e.g. depending on channel and/or procedure. In some cases, operation may be based on an OFDM waveform or a SC-FDM waveform (e.g., downlink and/or uplink), in particular a FDF-SC-FDM-based waveform. However, operation based on a single carrier waveform, e.g. SC-FDE (which may be pulse-shaped or Frequency Domain Filtered, e.g. based on modulation scheme and/or MCS), may be considered for downlink and/or uplink. In general, different waveforms may be used for different communication directions. Communicating using or utilising a carrier and/or beam may correspond to operating using or utilising the carrier and/or beam, and/or may comprise transmitting on the carrier and/or beam and/or receiving on the carrier and/or beam. 
     The approaches are particularly advantageously implemented in a 5 th  or 6th Generation (5G) telecommunication network or 5G radio access technology or network (RAT/RAN), in particular according to 3GPP (3 rd  Generation Partnership Project, a standardisation organization). A suitable RAN may in particular be a RAN according to NR, for example release  15  or later, or LTE Evolution. However, the approaches may also be used with other RAT, for example future 5.5G or 6G systems or IEEE based systems. 
     There is disclosed a method of operating a receiving radio node in a wireless communication network. The method comprises communicating utilising data signaling based on a received control information message, the control information message scheduling multiple occurrences of data signaling. Communicating is based on extracting a code block group (CBG) setup for communicating based on the received control information message and/or a CBG configuration. Alternatively, or additionally, the method may comprise one or more actions as described herein with regard to a wireless device or UE or receiving radio node. 
     A receiving radio node for a wireless communication network is described. The receiving radio node is adapted for communicating utilising data signaling based on a received control information message. The control information message schedules multiple occurrences of data signaling. Communicating is based on extracting a code block group (CBG) setup for communicating based on the received control information message and/or a CBG configuration. Alternatively, or additionally, the receiving radio node may be adapted for performing one or more actions as described herein with regard to a wireless device or UE or receiving radio node. 
     There is also considered a method of operating a signaling radio node in a wireless communication network. The method comprises communicating, with a receiving radio node, utilising data signaling, Communicating is according to a code block group (CBG) setup indicated to the receiving radio node with a control information message scheduling multiple occurrences of data signaling and/or a CBG configuration. Alternatively, or additionally, the method may comprise one or more actions as described herein with regard to a network node or gNB or signaling radio node. 
     A signaling radio node for a wireless communication network is proposed. The signaling radio node is adapted for communicating, with a receiving radio node, utilising data signaling. The communicating is according to a code block group (CBG) setup indicated to the receiving radio node with a control information message scheduling multiple occurrences of data signaling and/or a CBG configuration. Alternatively, or additionally, the signaling radio node may be adapted to perform one or more actions as described herein with regard to a network node or gNB or signaling radio node. 
     A code block group setup may indicate one or more parameters for handling CBGs, e.g. for HARQ feedback or HARQ format. It may for example comprise and/or indicate transmission information (e.g., CBGTI) and/or flush information (CBGFI), for one or more data signaling occurrences, and/or a number of scheduled occurrences. Communicating may comprise transmitting data signaling or feedback signaling (e.g., HARQ information feedback). Transmitting feedback signaling may be based on receiving the data signaling, e.g. as subject signaling, and/or receiving the control information message. A HARQ codebook, which may represent HARQ information signaling or feedback, may be based on the code block group setup. A CBG configuration may indicate a format for the data signaling, in particular for one or more occurrences, e.g. indicating which and/or how many CBG to be used, and/or how to provide feedback for the occurrence, e.g. for one or more CBGs. Each data signaling occurrence may be represented by transmission of a data block like a transport block, which may comprise one or more CBGs, e.g. according to and/or in line with a CBG configuration. A signaling radio node may operate (e.g., communicate) according to a set and/or configuration, e.g. such that signaling it transmits conforms to the setup and/or configuration and/or such that it assumes signaling it receives conforms to the setup and/or configuration. 
     Approaches described herein allow handling of multiple occurrences of data signaling, which may be scheduled with (e.g., exactly and/or a single) one control information message, e.g. one DCI message. The multiple occurrences may pertain to the same communication direction, e.g. uplink or downlink or sidelink. The control information message may be a scheduling assignment (e.g., scheduling the data signaling for reception by the receiving radio node) or a scheduling grant (e.g., scheduling the data signaling for transmission by the receiving radio node). The control information message may be transmitted by the signaling radio node. The CBG configuration may be pre-defined, and/or configured or configurable, e.g. by the signaling radio node and/or with higher layer signaling, e.g. RRC signaling or RLC layer signaling or MAC layer signaling. 
     Extracting a CBG setup may comprise determining the CBG setup, e.g. based on information in the control information message and/or the configuration. In particular, the CBG setup may be determined based on a number of schedulable or configured data signaling occurrence (e.g., configured with the CBG configuration), and/or the number and/or size of bit fields in the control information message, in particular bit fields pertaining to a CBG, like CBGTI and/or CBGTI and/or pertaining to new data (e.g., NDI, New Data Indication) and/or retransmission (e.g., indicating RV, Redundancy Version) and/or M and/or F. It may be considered that a configured number of data signaling occurrences (which may be a maximum number) may pertain to a single data signaling occurrence being scheduled with the control information message; for multiple occurrences scheduled with the control information message, the number of scheduled occurrences and/or the maximum number of scheduled or schedulable occurrences may be smaller, e.g. depending on the CBG configuration. The CBG setup may be determined based implicitly assuming CBG setup information based on the control information message and/or CBG configuration. The CBG setup may indicate different CBG setups for different data signaling occurrences and/or acknowledgement signaling like HARQ feedback pertaining thereto; in particular, the CBG setup may indicate that for some occurrences (one or more) and/or transport blocks, HARQ feedback pertain to and/or is only for a transport block and/or consists of one bit, e.g. one bit for one transport block, and for some (one or more), HARQ feedback pertains to and/or is for one or more CBGs of a transport block (and potentially for the transport block), and/or comprises more than one bit, e.g. one each for a CBG and/or the transport block as a whole. 
     It may be considered that the data signaling may be on a physical uplink data channel or a physical downlink data channel, e.g. PUSCH or PDSCH. 
     It may be considered that the multiple occurrences of data signaling may be associated to different transmission resources. Each occurrence may pertain to at least one different transmission resource. A transmission resource may pertain to and/or comprise a frequency domain resource and/or a time domain resource and/or a code resource and/or a layer and/or antenna port; resources may be distinguishable by associated coding (e.g., a cover code) and/or cyclic shift as cycling code and/or a signaling sequence, e.g. associated DM-RS (different/shifted DM-RS may be used for different resources and/or occurrences). Each data signaling occurrence may pertain to and/or represent a different transmission, e.g. on PUSCH or PDSCH or PSSCH, and/or to a different acknowledgement process, e.g. associated to a different HARQ ID. Different occurrences may be associated to the same carrier, or to different carriers. 
     The signaling radio node may in general comprise, and/or be adapted to utilise, processing circuitry and/or radio circuitry, in particular a transmitter and/or transceiver and/or receiver, to process (e.g., trigger and/or schedule) and/or transmit reference signaling and/or for receiving signaling indicative of the beam switching time. The signaling radio node (also referred to transmitting radio node) may in particular be a network node or base station, and/or a network radio node; it may be implemented as an IAB or relay node. However, in some cases, e.g. a sidelink scenario, it may be a wireless device. In general, signaling radio node may comprise and/or be adapted for transmission diversity, and/or may be connected or connectable to, and/or comprise, antenna circuitry and/or two or more independently operable or controllable antenna arrays or arrangements and/or transmitter circuitries and/or antenna circuitries, and/or may be adapted to use (e.g., simultaneously) a plurality of antenna ports (e.g., for transmitting synchronisation signaling, in particular first and second synchronisation signaling), e.g. controlling transmission using the antenna array/s. The signaling radio node may comprise multiple components and/or transmitters and/or TRPs (and/or be connected or connectable thereto) and/or be adapted to control transmission from such. Any combination of units and/or devices able to control transmission on an air interface and/or in radio as described herein may be considered a signaling radio node. 
     The approaches are particularly advantageously implemented in a 5 th  Generation (5G) telecommunication network or 5G radio access technology or network (RAT/RAN), in particular according to 3GPP (3 rd  Generation Partnership Project, a standardisation organization). A suitable RAN may in particular be a RAN according to NR, for example release  15  or later, or LTE Evolution. However, the approaches may also be used with other RAT, for example future 5.5G or 6G systems or IEEE based systems. It may be considered that the RAN is operating in an unlicensed frequency band (or carrier or part thereof) and/or based on a LBT procedure to access (for transmission) the frequency band (or carrier or part thereof), for example in a License Assisted Access (LAA) operation mode and/or in the context of NR-U (NR unlicensed). 
     There is also described a program product comprising instructions causing processing circuitry to control and/or perform a method as described herein. Moreover, a carrier medium arrangement carrying and/or storing a program product as described herein is considered. An information system comprising, and/or connected or connectable, to a radio node and/or wireless device is also disclosed. 
     It may be considered that the data signaling represents one occurrence of data signaling, e.g. covering a data block The data signaling may be part of a longer data signaling sequence, which may cover, and/or be embedded in, and/or represent a data transmission (time) interval. The data transmission interval may comprise a plurality of data signaling occurrences, each of which may carry, and/or be capable or configured or scheduled to carry, a different data block. The occurrences may be scheduled or configured jointly, e.g. with a scheduling grant or assignment, or separately, e.g. with multiple scheduling assignments. A data transmission time and/or data signaling sequence may comprise at least 2, at least 4, or at least 8 data signaling occurrences. 
     It may be considered that each data block (and/or code block and/or code block bundle and/or data signaling occurrence) may be associated to a different acknowledgement signaling process. Different processes may be associated to different process IDs and/or data (sub-) streams and/or transmission layers and/or buffers (e.g., for soft combining). 
     In general, it may be considered that a code block represents a part of a data block and/or CBB. A part of a data block associated to an allocation unit may be a code block, or a different part (e.g., smaller or larger than one code block, and/or comprising parts of more than one code block). 
     Communication may be based on TDD and/or FDD. Communicating may in general comprise transmitting and/or receiving signaling, e.g. data signaling. Communicating utilising or using data signaling may comprise transmitting or receiving data signaling, e.g. data signaling being transmitted according to the code block distribution. A node being configured for data signaling, e.g. receiving data signaling, may be considered to be set up with, and/or provided with a configuration or indication of a code block distribution, and/or provided with the code block distribution and/or associated mapping, and/or the associated resource structure/s, e.g. with control signaling, e.g. physical layer signaling or higher layer signaling, in particular with scheduling assignment/s and/or grant/s and/or resource configuration using higher layer signaling, e.g. RRC signaling configuring resources for data signaling (and/or indicating the CB distribution, e.g. indicating a Code block bundle size, and/or CB and/or BS as discussed herein) 
     A feedback or receiving radio node in general may be configured or configurable, e.g. by a network or a radio node, in particular a signaling radio node. The data signaling and/or code block bundle/s and/or signaling resource structure or structures may be configured with control information or control signaling, e.g. with physical layer signaling, e.g. on a physical control channel like PDCCH or PSCCH (for example, it may be scheduled, e.g. with one or more scheduling assignments or scheduling grants), and/or with higher layer signaling, e.g. RRC layer or MAC layer signaling, which may for example be mapped to a data channel, like PDSCH or PSSCH or similar. The indication signaling and/or indication resource structure may be configured with control information or control signaling, e.g. with physical layer signaling, e.g. on a physical control channel like PDCCH or PSCCH (for example, it may be scheduled or triggered, e.g. with one or more scheduling assignments or scheduling grants), and/or with higher layer signaling, e.g. RRC layer or MAC layer signaling, which may for example be mapped to a data channel, like PDSCH or PSSCH or similar. 
     A receiving radio node may comprise, and/or be adapted to utilise, processing circuitry and/or radio circuitry, in particular a receiver and/or transceiver and/or transmitter, for receiving the subject signaling like data signaling like data signaling and/or controls signaling, and/or for receiving control signaling associated to subject signaling, and/or for higher layer processing, and/or for demodulating and/or decoding the data and/or control and/or subject signaling, and/or for determining and/or transmitting control signaling, e.g. feedback signaling like acknowledgment signaling, in particular HARQ feedback. The receiving radio node may be a network node like a base station or relay node or a reception point or transmission and reception point, or may be implemented as wireless device like a terminal or user equipment. A receiving radio node may generally be adapted to receive signaling from the signaling radio node, e.g. data signaling and/or control signaling, and/or subject signaling. 
     A signaling radio node may comprise, and/or be adapted to utilise, processing circuitry and/or radio circuitry, in particular a transmitter and/or receiver and/or transceiver, for transmitting the subject signaling like data signaling, and/or control signaling like one or more scheduling assignment/s associated to subject signaling and/or representing subject signaling, and/or encoding and/or mapping code block/s and or CBGs to subject or data signaling, and/or for higher layer processing and/or receiving and/or transmitting of control signaling. The signaling radio node may be a network node like a base station or relay node or a reception point or transmission and reception point, or may be implemented as wireless device like a terminal or user equipment. A signaling radio node may generally be adapted to transmit and/or receive signaling to and/or from the receiving radio node, e.g. data signaling and/or control signaling, in particular feedback signaling like HARQ feedback signaling and/or acknowledgement signaling. 
     Receiving data signaling may comprise and/or be based on decoding and/or demodulating data signaling, e.g. based on a configuration and/or scheduling information. Data signaling may be configured and/or scheduled for transmission and/or reception, e.g. by the network or a network node, for example with physical layer signaling and/or higher layer signaling. For example, a network node as signaling radio node may configure and/or schedule data signaling to be received by a wireless device, or as a receiving node, it may schedule or configure data signaling to be transmitted by a wireless device. Receiving may be based on the assumption that code blocks are mapped to allocation units as described herein. Transmitting data signaling may be based on and/or comprise, mapping information or data or corresponding bits to code blocks and/or allocation units, e.g. based on a modulation scheme and/or scheduling and/or operating conditions. A network node may be adapted to schedule and/or configure data signaling. 
     There is also described a program product comprising instructions causing processing circuitry to control and/or perform a method as described herein. Moreover, a carrier medium arrangement carrying and/or storing a program product as described herein is considered. An information system comprising, and/or connected or connectable, to a radio node is also disclosed. 
     The data signaling may be associated to a data channel, and/or a priority level. Different data signalings may be associated to different data channels, or different priority levels, e.g. for URLLC or other high priority signaling. 
     Transmission parameters may comprise in particular frequency resources and/or start (in time domain, e.g. in which allocation unit) and/or modulation and/or coding (in particular, modulation and coding scheme) and/or code rate and/or beam parameters, e.g. pertaining to the beam in which the data signaling is transmitted) and/or MIMO parameter/s and/or parameter/s indicating an arrangement of code blocks of the data signaling, and/or information regarding reception, e.g. antenna and/or beams for reception, and/or information indicative of a beam pair to use for transmission and/or reception. 
     A code block may in general represent bits of information (e.g., user data and/or payload) and/or error coding, and/or may be represented by a corresponding bit sequence. A code block (e.g., its bits or representation) may be mapped to one or more modulation symbols contained in the one or more allocation units (e.g., depending on modulation and/or coding scheme and/or bandwidth and/or waveform). The allocation unit may in some cases contain reference signaling, e.g. phase tracking reference signaling, which may for example be included as a sequence, e.g. in a fixed and/or predefined and/or configured or configurable location (e.g. in time domain) of the allocation unit. Control information like header information and/or similar from higher layers may be represented by the information bits of the code block. In general, a code block may be padded (e.g. with zeros or ones) to allow occupying an allocation unit, e.g. if the code block size otherwise is too small to fully occupy one allocation unit. Alternatively, padding signaling may be used, e.g. padding symbols associated to the allocation unit not completely filled by a code block and/or its error coded representation. An error coded representation of a code block may comprise bits representing the information of the code block and/or error detection coding and/or error correction coding; the information bits may be directly included, or transformed (e.g., when using polar coding for FEC). A code block bundle (CBB) or code block group (CBG) may comprise a plurality of code blocks; the code blocks in a CBB may be encoded separately. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings are provided to illustrate concepts and approaches described herein, and are not intended to limit their scope. The drawings comprise: 
         FIG. 1 , showing an exemplary HARQ feedback scenario; 
         FIG. 2 , showing a schematic flowchart for an exemplary operation scenario; 
         FIG. 3 , showing a schematic flowchart for another exemplary operation scenario; 
         FIG. 4 , showing an exemplary receiving radio node, implementable as a wireless device; and 
         FIG. 5 , showing an exemplary signaling radio node, implementable as a network node. 
     
    
    
     DETAILED DESCRIPTION 
     In this disclosure, reference may be made to symbols. A symbol in this context may be considered an example of an allocation unit or block symbol, and these terms may be used interchangeably, e.g. for different waveforms. In the following, there are described, by way of example, some approaches in the context of NR technology. However, approaches may be analogously applicable in other contexts. 
     Downlink control information may be representative of control signaling. In the 3GPP NR standard, downlink control information (DCI), which is transmitted in a physical downlink control channel (PDCCH), may be used to indicate DL data related information, UL related information, power control information, slot format indication, etc. There are different formats of DCI associated with each of these control signals and the UE may identify them based on different radio network temporary identifiers (RNTIs) and/or one or more signaling characteristics. 
     A UE may be configured by higher layer signaling to monitor for Das in different resources with different periodicities, etc. DCI formats 1_0, 1_1, and 1_2 (which are examples of scheduling assignments) may be used for scheduling DL data (which may be a form of subject signaling) which is sent in a physical downlink shard channel (PDSCH); these formats may indicate and/or allocate and/or include time and frequency resources for DL transmission, and/or modulation and coding information, HARQ (hybrid automatic repeat request) information, etc. 
     In case of DL semi-persistent scheduling (SPS) and UL configured grant type 2, part of the scheduling including the periodicity is provided by a higher layer configuration, while the rest of scheduling information such as time domain and frequency domain resource allocation, modulation and coding, etc, are provided by the DCI in PDCCH. 
     The time domain resources for the scheduled PDSCH or PUSCH may be indicated to the UE via a 4-bit time domain resource assignment (TDRA) field, which may be an example of a time resource indication. The TDRA field value m of the DCI provides a row index m+1 to an time domain resource allocation table. An exemplary PDSCH time domain resource allocation table is shown in Table 1. Each indexed row defines a slot offset K 0 , the start and length indicator SLIV, or equivalently the start symbol S and the allocation length L, and the PDSCH mapping type to be assumed in the PDSCH reception. Similarly, each row in the PUSCH time domain resource allocation table defines a slot offset K 2 , the start and length indicator SLIV, or directly the start symbol S and the allocation length L, and the PUSCH mapping type. 
     
       
         
           
               
             
               
                 TABLE 1  
               
             
            
               
                   
               
               
                 Exemplary PDSCH time domain resource allocation table 
               
            
           
           
               
               
               
               
               
            
               
                   
                   
                   
                   
                 PDSCH 
               
               
                 Row 
                   
                   
                   
                 mapping 
               
               
                 index 
                 K 0   
                 S 
                 L 
                 type 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 1 
                 0 
                 2 
                 12 
                 Type A 
               
               
                 2 
                 0 
                 2 
                 10 
                 Type A 
               
               
                 3 
                 0 
                 2 
                 9 
                 Type A 
               
               
                 4 
                 0 
                 2 
                 7 
                 Type A 
               
               
                 5 
                 0 
                 2 
                 5 
                 Type A 
               
               
                 6 
                 0 
                 9 
                 4 
                 Type B 
               
               
                 7 
                 0 
                 4 
                 4 
                 Type B 
               
               
                 8 
                 0 
                 5 
                 7 
                 Type B 
               
               
                 9 
                 0 
                 5 
                 2 
                 Type B 
               
               
                 10 
                 0 
                 9 
                 2 
                 Type B 
               
               
                 11 
                 0 
                 12 
                 2 
                 Type B 
               
               
                 12 
                 0 
                 1 
                 13 
                 Type A 
               
               
                 13 
                 0 
                 1 
                 6 
                 Type A 
               
               
                 14 
                 0 
                 2 
                 4 
                 Type A 
               
               
                 15 
                 0 
                 4 
                 7 
                 Type B 
               
               
                 16 
                 0 
                 8 
                 4 
                 Type B 
               
               
                   
               
            
           
         
       
     
     In Rel-15 NR, a DCI can schedule one PDSCH or one PUSCH and, hence, each row of the PDSCH or PUSCH time domain resource allocation table contains time domain resource parameters for one PDSCH or one PUSCH. In Rel-16 NR, the PUSCH time domain resource allocation table is enhanced such that each row can provide the start symbols and the allocation lengths, and the PUSCH mapping types for multiple consecutive PUSCH starting from one slot offset K 2 . An exemplary Rel-16 PUSCH time domain resource allocation table with multiple PUSCH scheduling is shown in Table 2. Row 1 can be used to schedule two consecutive PUSCHs both starting in OS #0 with lengths 14 OSs and with the same mapping type A. Row 2 can be used to schedule two consecutive PUSCHs with different lengths. Row 3 can be used to schedule three consecutive PUSCHs with different lengths and different mapping types. 
     
       
         
           
               
             
               
                 TABLE 2  
               
             
            
               
                   
               
               
                 Exemplary Rel-16 PUSCH time domain resource allocation 
               
               
                 table with multiple PUSCH scheduling 
               
            
           
           
               
               
               
               
               
            
               
                   
                   
                   
                   
                 PUSCH 
               
               
                 Row 
                   
                   
                   
                 mapping 
               
               
                 index 
                 K 2   
                 S 
                 L 
                 type 
               
               
                   
               
               
                 1 
                 j 
                 0, 0 
                 14, 14 
                 Type A, 
               
               
                   
                   
                   
                   
                 Type A 
               
               
                 2 
                 j 
                 0, 0 
                 14, 12 
                 Type A, 
               
               
                   
                   
                   
                   
                 Type A 
               
               
                 3 
                 j 
                 0, 0, 2 
                 14, 14, 10 
                 Type A, 
               
               
                   
                   
                   
                   
                 Type A, 
               
               
                   
                   
                   
                   
                 Type B 
               
               
                 4 
                 j 
                 0, 2 
                 12, 10 
                 Type A, 
               
               
                   
                   
                   
                   
                 Type B 
               
               
                 . . . 
                 . . . 
                 . . . 
                 . . . 
                 . . . 
               
               
                   
               
            
           
         
       
     
     Uplink control information may be seen as a form of control signaling transmitted by a receiving radio node like a UE or terminal. Uplink control information (UCI) may be control information sent by a UE to a gNB. It may comprise and/or consist of
         Acknowledgement information in the form of Hybrid-ARQ acknowledgement (HARQ-ACK) which is a feedback information corresponding to, and/or associated to, a (scheduled) downlink transport block, indicating for example whether the transport block reception is successful or not,   Measurement information like Channel state information (CSI) related to downlink channel conditions, which provides a gNB with channel-related information useful for DL scheduling, including information for multi-antenna and beamforming schemes, and/or   Scheduling request (SR), which indicates a need of UL resources for UL data transmission.       

     UCI is typically transmitted on physical uplink control channel (PUCCH). However, if a UE is transmitting data on a PUSCH with a valid PUSCH resource overlapping with PUCCH, UCI can be multiplexed with UL data and transmitted on PUSCH instead, if the timeline requirements for UCI multiplexing is met. 
     A Physical Uplink Control Channel (PUCCH) may be used by a UE to a transmit feedback, which may include a HARQ-ACK feedback message, corresponding to the reception of DL data transmission (which may be subject signaling). It may also be used by the UE to send channel state information (CSI) and/or to request for an uplink grant for transmitting UL data. 
     In NR, there exist multiple PUCCH formats supporting different UCI payload sizes. PUCCH formats 0 and 1 support UCI up to 2 bits, while PUCCH formats 2, 3, and 4 can support UCI of more than 2 bits. In terms of PUCCH transmission duration, PUCCH formats 0 and 2 are considered short PUCCH formats supporting PUCCH duration of 1 or 2 OFDM symbols, while PUCCH formats 1,3, and 4 are considered as long formats and can support PUCCH duration from 4 to 14 symbols. 
     The frequency/time resources for sending the HARQ-ACK information corresponding a PDSCH are indicated by PUCCH resource indicator (PRI) field and K 1  in the DCI which points to one of PUCCH resources that are configured by higher layers. 
     If the first symbol of PUCCH intended to carry the HARQ-ACK information starts no earlier than at symbol L 1 , where L 1  is defined as the earliest uplink symbol with its CP starting after T proc,1  after the end of the last symbol of the PDSCH carrying the TB being acknowledged, then the UE shall provide a valid HARQ-ACK information, wherein T proc,1  is given in the standard. 
     Otherwise, if the UE is not provided with a K 1  that allows for enough processing time, the UE may not provide a valid HARQ-ACK corresponding to the scheduled PDSCH in the indicated PUCCH occasion. This case can happen if the first symbol of PUCCH which carries the HARQ-ACK information starts earlier than T proc,1  after the end of the last symbol of the PDSCH carrying the TB being acknowledged. 
     NR defines  2  UE categories with respect to PDSCH decoding time Ni. Ni depends on the DMRS configuration, UE capability and the subcarrier spacing as shown in tables 3 and 4. 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 PDSCH processing time for PDSCH processing capability 1 
               
            
           
           
               
               
            
               
                   
                 PDSCH decoding time N 1  [symbols] 
               
            
           
           
               
               
               
            
               
                   
                   
                 dmrs-AdditionalPosition ≠ pos0 
               
               
                   
                 dmrs-AdditionalPosition = pos0 
                 in DMRS-DownlinkConfig in either of 
               
               
                   
                 in DMRS-DownlinkConfig in both of 
                 dmrs-DownlinkForPDSCH-MappingTypeA, 
               
               
                   
                 dmrs-DownlinkForPDSCH-MappingTypeA, 
                 dmrs-DownlinkForPDSCH-MappingTypeB or 
               
               
                 μ 
                 dmrs-DownlinkForPDSCH-MappingTypeB 
                 if the higher layer parameter is not configured 
               
               
                   
               
            
           
           
               
               
               
            
               
                 0 
                 8 
                 N 1, 0   
               
               
                 1 
                 10 
                 13 
               
               
                 2 
                 17 
                 20 
               
               
                 3 
                 20 
                 24 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
             
            
               
                   
               
               
                 PDSCH processing time for PDSCH processing capability 2 
               
            
           
           
               
               
               
            
               
                   
                   
                 PDSCH decoding time N 1  [symbols] 
               
               
                   
                   
                 dmrs-AdditionalPosition = pos0 in 
               
               
                   
                   
                 DMRS-DownlinkConfig in both of 
               
               
                   
                   
                 dmrs-DownlinkForPDSCH-MappingTypeA, 
               
               
                   
                 μ 
                 dmrs-DownlinkForPDSCH-MappingTypeB 
               
               
                   
                   
               
               
                   
                 0 
                 3   
               
               
                   
                 1 
                 4.5 
               
               
                   
                 2 
                 9 for frequency range 1 
               
               
                   
                   
               
            
           
         
       
     
     A procedure for receiving downlink transmission may comprise that the UE first monitors and decodes a PDCCH in slot n, which points to a subject transmission (DL data, on PDSCH) scheduled in slot n+K 0  slots (K 0  is larger than or equal to 0). The UE then decodes the data in the corresponding PDSCH. Based on the outcome of the decoding, the UE sends an acknowledgement of the correct decoding (ACK) or a negative acknowledgement (NACK) to the gNB at time slot n+K 0 +K 1  (in case of slot aggregation n+K 0  would be replaced by the slot where PDSCH ends). Both of K 0  and K 1  are indicated in the DCI. The resources for sending the acknowledgement are indicated by PUCCH resource indicator (PRI) field in the DCI which points to one of PUCCH resources that are configured by higher layers. 
     Depending on DL/UL slot configurations, or whether carrier aggregation, or per code-block group (CBG) transmission used in the DL, the feedback for several PDSCHs may need to be multiplexed in one feedback. This is done by constructing HARQ-ACK codebooks. In NR, the UE can be configured to multiplex the A/N bits using a semi-static codebook or a dynamic codebook. 
       FIG. 1  illustrates the timeline in a simple scenario with two PDSCHs and one feedback. In this example, there are a total of 4 PUCCH resources configured, and the PRI indicates PUCCH  2  to be used for HARQ feedback.  FIG. 1  shows an example of a transmission timeline. The timing for sending HARQ feedback is determined based on both PDSCH transmission slot with reference to PDCCH slot (K 0 ) and the PUCCH slot that contains HARQ feedback (K 1 ). 
     A UE may be configurable with a maximum of 4 PUCCH resource sets for transmission of HARQ-ACK information. Each set is associated with a range of UCI payload bits including HARQ-ACK bits. The first set is always associated to 1 or 2 HARQ-ACK bits and may include only PUCCH format 0 or 1 or both. The range of payload values (minimum of maximum values) for other sets, if configured, is provided by configuration, except the maximum value for the last set where a default value is used, and the minimum value of the second set being 3. The first set can include a maximum of 32 PUCCH resources of PUCCH format 0 or 1. Other sets can include maximum 8 bits of format 2 or 3 or 4. 
     The UE may determine a slot for transmission of HARQ-ACK bits in a PUCCH corresponding to PDSCHs scheduled or activated by DCI via K1 value provided by configuration or a field in the corresponding DCI. The UE forms a codebook from the HARQ-ACK bits with associated PUCCH in a same slot via corresponding K1 values. 
     The UE determines a PUCCH resource set that the size of the codebook is within the corresponding range of payload values associated to that set. The UE determines a PUCCH resource in that set if the set is configured with maximum 8 PUCCH resources, by a field in the last DCI associated to the corresponding PDSCHs. If the set is the first set and is configured with more than 8 resources, a PUCCH resource in that set is determined by a field in the last DCI associated to the corresponding PDSCHs and implicit rules based on the CCE (Control Channel Element, a resource structure in a CORESET or search space monitored for DCI). 
     A PUCCH resource for HARQ-ACK transmission can overlap in time with other PUCCH resources for CSI and/or SR transmissions as well as PUSCH transmissions in a slot. In case of overlapping PUCCH and/or PUSCH resources, first the UE resolves overlapping between PUCCH resources, if any, by determining a PUCCH resource carrying the total UCI (including HARQ-ACK bits) such that the UCI multiplexing timeline requirements are met. There might be partial or completely dropping of CSI bits, if any, to multiplex the UCI in the determined PUCCH resource. Then, the UE resolves overlapping between PUCCH and PUSCH resources, if any, by multiplexing the UCI on the PUSCH resource if the timeline requirements for UCI multiplexing is met. 
     Type 1 or semi-static codebook consists of a bit sequence where each element contains the A/N bit from a possible allocation in a certain slot, carrier, or transport block (TB). When the UE is configured with CBG and/or time-domain resource allocation (TDRA) table with multiple entries, multiple bits are generated per slot and TB (see below). It is important to note that the codebook is derived regardless of the actual PDSCH scheduling. The size and format of the semi-static codebook is preconfigured based on the mentioned parameters. The drawback of semi-static HARQ ACK codebook is that the size is fixed, and regardless of whether there is a transmission or not a bit is reserved in the feedback matrix. In the case that a UE has a TDRA table with multiple time-domain resource allocation entries configured, the table may be pruned (e.g., entries may be removed based on a specified algorithm) to derive a TDRA table that only contains non-overlapping time-domain allocations. One bit is then reserved in the HARQ CB for each non-overlapping entry (assuming a UE is capable of supporting reception of multiple PDSCH in a slot). 
     In type 2 or dynamic HARQ codebook, an A/N bit is present in a codebook only if there is a corresponding transmission scheduled. To avoid any confusion between the gNB and the UE on the number of PDSCHs that the UE has to send a feedback for, a counter downlink assignment indicator (counter DAI or C-DAI) field exists in DL assignment, which indicates (e.g., using a modulo operation) accumulative number of {serving cell, PDCCH occasion} pairs in which a PDSCH is scheduled to a UE up to the current PDCCH. In addition to that, there is another field called total DAI (T-DAI) when carrier aggregation is configured, which when present indicates the total number of {serving cell, PDCCH occasion} up to (and including) all PDCCHs across all serving cells of the current PDCCH monitoring occasion. The timing for sending HARQ feedback is determined based on both PDSCH transmission slot with reference to PDCCH slot (K 0 ) and the PUCCH slot that contains HARQ feedback (K 1 ). 
     An enhanced dynamic codebook or enhanced Type-2 codebook based on Type 2 codebook is introduced to enable retransmission of the HARQ feedback corresponding to the used HARQ processes. If, for any reason, the scheduled codebook (representing the HARQ feedback) was not received from the UE, the retransmission of the feedback can be requested by the gNB. A toggle bit, new feedback indicator (NFI), is added in the DCI to indicate whether the HARQ-ACK feedback from the UE was received by the gNB or not. If toggled, the UE assumes that the reported feedback was correctly received. Otherwise, if the gNB fails to receive the scheduled PUCCH, the UE is expected to retransmit the feedback. In the latter case, the DAI (C/T-DAI) counting is not reset, instead the DAI are accumulated within a PDSCH group until NFI for the PDSCH group is toggled. 
     As the triggering of additional HARQ feedback reporting occurs with ambiguous timing relation to the associated PDSCHs, PDSCH grouping is introduced. A PDSCH group is defined as the PDSCH(s) for which the HARQ-ACK information is originally indicated to be carried in a same PUCCH. PDSCH grouping allows the gNB to explicitly indicate which codebook is missing. The group index is explicitly signaled in the scheduling DCI. If an enhanced dynamic codebook is configured, two PDSCH groups are supported. Together with the group ID, the gNB signals a request group ID which is a 1-bit field. By referring to the group Id (ID), request ID (RI), and the value of the NFI field in the DCI, the UE can figure out if the next feedback occasion should include only initial transmission or also retransmission of feedback corresponding to PDSCH(s) associated with the indicated group. 
     Similar to NR, the DAI value may also be included in the UL grant scheduling PUSCH. As an additional functionality, the gNB can indicate the DAI value for each group separately in the UL grant to resolve any possible ambiguity at the UE side. 
     A one-shot (Type-3) HARQ codebook may be used. The UE may be configured to monitor for a feedback request of a HARQ-ACK codebook containing all DL HARQ processes. The feedback can be requested in DL DCI format 1_1. In response to the trigger, the UE reports the HARQ-ACK feedback for all (e.g., current) DL HARQ processes. The format of the feedback, either CBG-based HARQ-ACK or TB-based HARQ-ACK, can be configured to be part of the one-shot HARQ feedback for the component carriers. 
     Additionally, to resolve any possible ambiguity between the gNB and the UE that might be caused by possible mis-detection of PDCCH(s), the UE can be configured to report the corresponding latest NDI value for a latest received PDSCH for that HARQ process along with the corresponding HARQ-ACK for the received PDSCH. From a gNB perspective, if the NDI value matches the last transmitted value, it indicates that the reported HARQ-ACK feedback correctly corresponds to the HARQ process with pending feedback. Otherwise, the mismatch suggests that the UE is reporting an outdated feedback. 
     Up to rel-16, the PDSCH can be scheduled using DCI 1_0, 1_1,2_1, all which schedule one PDSCH at a time. Multiple PDSCH scheduling, i.e., one DL DCI schedules multiple PDSCHs, may be considered. A solution to dynamically enable CBG based HARQ feedback for multiple PDSCH scheduling (with one scheduling assignment) is proposed. 
     The proposed approaches may enhance DL data scheduling DCI Formats to support CBG based HARQ feedback for multiple PDSCH scheduling. Specifically, approaches are provided to update DL DCI Formats to dynamically indicate TB based or CBG based HARQ feedback in multiple PDSCH scheduling. 
     A CBG-based HARQ feedback solution is provided, and dynamic switching between TB based and CBG based HARQ feedback in multiple PDSCH scheduling is facilitated. 
     Even though the variants below are explicitly referring to multiple PDSCH scheduling, they are equally equivalent to multiple PUSCH scheduling, where multiple PUSCH scheduling and PUSCH-CodeBlockGroup Transmission can be configured simultaneously. 
     According to following variants, a UE may be configured with PDSCH-CodeBlockGroupTransmission, which indicates CBG based transmission is used and the maximum number of CBGs per TB (M). If the UE is not configured with PDSCH-CodeBlockGroupTransmission, it should may TB based transmission is used. A transport block (TB) may be considered an example of a data block, a CBG may be an example of a sub block. 
     In one variant, a UE may be configured with maxNrofMultiplePDSCHs-r17 and maxNrofMultiplePDSCHsWithCBG-r17, which respectively indicate the maximum number of PDSCHs scheduled by a single DCI (denoted as X) and maximum number of PDSCHs scheduled by a single DCI and with CBGTI/CBGFI included (denoted as Y); this may be in context of multiple PDSCH scheduling (by one DCI) being enabled and/or configured. 
     In a DL DCI format that may schedule multiple PDSCHs, there are some fields that may be PDSCH specific, such as NDI (New Data Indicator) and RV (Redundancy Version). Assuming the number of bits for NDI and RV as N NDI  and N RV  respectively, the total number of bits for signaling NDI and RV in a multiple PDSCH scheduling DCI is (N NDI +N RV )*X, where X is the higher layer configured maxNrofMultiplePDSCHs-r17. 
     If CBG based transmission should be used in conjunction with multiple PDSCH scheduling, for each CBG scheduled PDSCH, a CBGTI field of M bits and a CBGFI field of F bit may be included into the scheduling assignment, where M may be the higher layer configured maxCodeBlockGroupsPerTransportBlock, and F may be 0 or 1, e.g., depending on higher layer configured codeBlockGroupFlushIndicator. Hence, the total number of bits for signaling NDI, RV and CBGTI in a multiple PDSCH scheduling DCI with CBG base transmission is (N NDI +N RV +M+F)*Y, where Y is the higher layer configured maxNrofMultiplePDSCHsWithCBG-r17. 
     According to this variant, in a multiple PDSCH scheduling scenario, UE detects a DCI Format 1_1 or other form of scheduling assignment. The number of PDSCHs being scheduling (N) is obtained from reading the TDRA field of the DCI, and the pre-configured higher layer PDSCH Time Domain Resource Allocation table (e.g., pdsch-TimeDomainAllocationList-ForMultiPDSCH-r17). The UE may determine whether CBGTI/CBGFI is included in the DCI per scheduled PDSCH according to the following procedure:
         If CBG based transmission is not configured, UE should assume CBGTI/CBGFI is not included for all scheduled PDSCHs;   Otherwise, if CBG based transmission is configured:
           If N is larger than Y, UE should assume CBGTI/CBGFI is not included for all scheduled PDSCHs;   Otherwise, i.e., Nis smaller or equal   
               

     to Y, UE should assume CBGTI/CBGFI is included for all scheduled PDSCHs. 
     This decision-making procedure is illustrated in the flowchart in  FIG. 2  Figure.  FIG. 2  shows a flow chart for determinating whether CBGTI/CBGFI is included per scheduled PDSCH, according to a variant 1. 
     If the CBGTI for a scheduled PDSCH is not included in the DCI, the UE may implicitly assume that all the CBGs for said PDSCH are included in the transmitted PDSCH, e.g., the equivalent to indicating CBGTI is all “1”s. 
     If the CBGFI for a scheduled PDSCH is not included in the DCI, the UE may implicitly assume that CBGFI for said PDSCH equals to “0”. 
     According to this variant, based on a maxNrofMultiplePDSCHs-r17 configuration, the DCI may contain a fixed (N NDI +N RV )*X bits to be shared between the information fields needed for multiple PDSCH and CBG scheduling. That is, the following inequation may be maintained: 
     
       
         
           
             
               
                 
                   ( 
                   
                     
                       N 
                       NDI 
                     
                     + 
                     
                       N 
                       RV 
                     
                   
                   ) 
                 
                 * 
               
               ⁢ 
               X 
             
             &gt;= 
             
               
                 
                   ( 
                   
                     
                       N 
                       NDI 
                     
                     + 
                     
                       N 
                       RV 
                     
                     + 
                     M 
                     + 
                     F 
                   
                   ) 
                 
                 ⋆ 
               
               ⁢ 
               Y 
             
           
         
       
     
     The maximum number of PDSCHs with CBGTI/CBGFI included in the multiple scheduling DCI may be: 
     
       
         
           
             Y 
             = 
             
               ⌊ 
               
                 
                   
                     ( 
                     
                       
                         N 
                         NDI 
                       
                       + 
                       
                         N 
                         
                           R 
                           ⁢ 
                           V 
                         
                       
                     
                     ) 
                   
                   * 
                   X 
                 
                 
                   
                     N 
                     NDI 
                   
                   + 
                   
                     N 
                     
                       R 
                       ⁢ 
                       V 
                     
                   
                   + 
                   M 
                   + 
                   F 
                 
               
               ⌋ 
             
           
         
       
     
     where └x┘ is the floor function giving the largest integer no larger than x. 
     The maximum number of PDSCHs scheduled by a single DCI and with CBGTI/CBGFI included (denoted as Y) can be derived by the gNB and explicitly signaled to the UE by means of RRC configuration (e.g. the higher layer configured maxNrofMultiplePDSCHsWithCBG-r17). Alternatively, the gNB may signal the maximum number of CBGs per TB (M) which is used by the UE to implicitly derive Y (e.g. using the equations above). 
     As an example, assume X=8, N NDI =1, N RV =1, M=4, F=0, Y should be no more than 2. 
     As another example, assume X=8, N NDI =1, N RV =1, M=2, F=0, Y should be no more than 4. 
     The UE may be configured accordingly. 
     The inequation equation may be generalized to consider other DCI fields depending on whether or not CBG-based transmission is configured. For example, it may be assumed that the summation of the bit-widths of all DCI fields that are present when CBG-based transmission is not configured is donated by Z TB  and the summation of bit-widths of all DCI fields that are present when CBG-based transmission is configured is donated by Z CBG . 
     The following inequation may be maintained (e.g., by configuring the UE/receiving radio node) accordingly: 
     
       
         
           
             
               
                 Z 
                 
                   T 
                   ⁢ 
                   B 
                 
               
               + 
               
                 
                   
                     ( 
                     
                       
                         N 
                         NDI 
                       
                       + 
                       
                         N 
                         RV 
                       
                     
                     ) 
                   
                   * 
                 
                 ⁢ 
                 X 
               
             
             &gt;= 
             
               
                 
                   
                     ( 
                     
                       
                         N 
                         NDI 
                       
                       + 
                       
                         N 
                         RV 
                       
                       + 
                       M 
                       + 
                       F 
                     
                     ) 
                   
                   ⋆ 
                 
                 ⁢ 
                 Y 
               
               + 
               
                 
                   Z 
                   
                     C 
                     ⁢ 
                     B 
                     ⁢ 
                     G 
                   
                 
                 . 
               
             
           
         
       
     
     Certain fields can be disabled depending on whether or not CBG-based transmission is configured, and in such a situation, Z TB ≠Z CBG . For example, the gNB can configure absence of certain fields when CBG-based transmission is configured, for instance, ZP CSI-RS trigger, and/or SRS request, etc. 
     According to another variant, a multiple scheduling DCI can still schedule up to X PDSCHs as pre-configured by higher layer, even when CBG base transmission is also configured. In this case, CBGTI/CBGFI for the first (or last) Y PDSCHs are assumed to be included, while CBGTI/CBGFI for the remaining PDSCHs are assumed to be not included. The gNB may ensure the following inequation to hold such that the total number of bits for signaling NDI, RV, CBGTI and CBGFI does not increase compared to the case when CBG based transmission is not configured: 
     
       
         
           
             
               
                 
                   ( 
                   
                     
                       N 
                       NDI 
                     
                     + 
                     
                       N 
                       RV 
                     
                   
                   ) 
                 
                 ⋆ 
               
               ⁢ 
               X 
             
             &gt;= 
             
               
                 
                   
                     ( 
                     
                       
                         N 
                         NDI 
                       
                       + 
                       
                         N 
                         RV 
                       
                       + 
                       M 
                       + 
                       F 
                     
                     ) 
                   
                   ⋆ 
                 
                 ⁢ 
                 Y 
               
               + 
               
                 
                   
                     ( 
                     
                       
                         N 
                         NDI 
                       
                       + 
                       
                         N 
                         RV 
                       
                     
                     ) 
                   
                   ⋆ 
                 
                 ⁢ 
                 
                   ( 
                   
                     N 
                     - 
                     Y 
                   
                   ) 
                 
               
             
           
         
       
     
     According to this variant, UE may determine whether CBGTI/CBGFI is included in the DCI per scheduled PDSCH according to the following procedure
         If CBG based transmission is not configured, the UE may assume CBGTI/CBGFI is not included for all scheduled PDSCHs;   Otherwise, if CBG based transmission is configured:
           If N is larger than Y, UE may assume CBGTI/CBGFI is included for the first (or the last) Y PDSCHs, while not included for the remaining PDSCHs;   Otherwise, i.e., N is smaller or equal to Y, UE may assume CBGTI/CBGFI to be included for all scheduled PDSCHs.   
               

     This decision-making procedure is illustrated in the flowchart in  FIG. 3 .  FIG. 3  shows a flowchart for determinating whether CBGTI/CBGFI is included per scheduled PDSCH according to a variant 2 
     If the CBGTI for a scheduled PDSCH is not included in the DCI, the UE may implicitly assume that all the CBGs for said PDSCH are included in the transmitted PDSCH, equivalent to indicating CBGTI is all “1”s. If the CBGFI for a scheduled PDSCH is not included in the DCI, the UE may implicitly assume that CBGFI for said PDSCH equals to “0”. 
     As an example, there may be assumed X=8, N NDI =1, N RV =1, M=4, F=0, Y=2. If the UE identifies from the DCI that N is 4, the UE may assume CBG based transmission for the first 2 PDSCHs, and TB based transmission for the other 2 PDSCHs. If may be considered that either the first or the last Y PDSCHs are indicated with CBGTI/CBGFI are specified in the relevant specification. 
     Alternatively, or additionally, the UE may determine either the first or the last Y PDSCHs are indicated with CBGTI/CBGFI according to the following procedure:
         Among the fixed (N NDI +N RV )*X bits, the first (N NDI +N RV )*N bits are used for NDI and RX;   the remaining bits (N NDI +N RV )*(X−N) are allocated to CBGTI/CBGFI for Y PDSCHs, where Y is derived as:       

     
       
         
           
             
               Y 
               = 
               
                 min 
                 ⁡ 
                 
                   ( 
                   
                     N 
                     , 
                     
                       ⌊ 
                       
                         
                           
                             ( 
                             
                               
                                 N 
                                 NDI 
                               
                               + 
                               
                                 N 
                                 
                                   R 
                                   ⁢ 
                                   V 
                                 
                               
                             
                             ) 
                           
                           * 
                           
                             ( 
                             
                               X 
                               - 
                               N 
                             
                             ) 
                           
                         
                         
                           M 
                           + 
                           F 
                         
                       
                       ⌋ 
                     
                   
                   ) 
                 
               
             
             ; 
           
         
       
         
         
           
             If Y=N, all N scheduled PDSCHs are indicated with CBGTI/CBGFI; 
             Otherwise, the number of left-over bits is (N NDI +N RV )*(X−N)−(M+F)*Y; 
             If (N NDI +N RV )*(X−N)−(M+F)*Y=0: UE should assume the first (or last, as specified by the relevant specification) Y scheduled PDSCHs are indicated with CBGTI/CBGFI, the remaining (N-Y) scheduled PDSCHs are not; 
             If (N NDI +N RV )*(X−N)−(M+F)*Y&gt;0: use the i-th bit is used as indicator where i=((N NDI +N RV )*N+(M+F)*Y); 
             If i-th bit is 0: UE should assume the first Y scheduled PDSCHs are indicated with CBGTI/CBGFI, the remaining (N−Y) scheduled PDSCHs are not; 
             If i-th bit is 1: UE should assume the last Y scheduled PDSCHs are indicated with CBGTI/CBGFI, the remaining (N−Y) scheduled PDSCHs are not; 
           
         
       
    
     The reverse approach may be utilised analogously. 
     Alternatively, or additionally, if the UE is configured with PDSCH-CodeBlockGroupTransmission and multiple PDSCH scheduling, the UE may prepare CBG-based HARQ-ACK feedback for all scheduled PDSCHs regardless of whether CBGTI or CBGFI fields of any of the scheduled PDSCHs are actually included in the DCI according the above DCI processing variants. 
     More alternatively, or additionally, if the UE is configured with PDSCH-CodeBlockGroupTransmission and multiple PDSCH scheduling, the UE may prepare
         CBG-based HARQ-ACK feedback for the scheduled PDSCHs with CBGTI/CBGFI included in the DCI; and/or   TB-based HARQ-ACK feedback for the scheduled PDSCHs without CBGTI/CBGFI included in the DCI, according the above DCI processing variants.       

       FIG. 4  schematically shows a radio node, in particular a wireless device or terminal or a UE (User Equipment) or receiving radio node. Radio node  10  comprises processing circuitry (which may also be referred to as control circuitry)  20 , which may comprise a controller connected to a memory. Any module of the radio node  10 , e.g. a communicating module or determining module, may be implemented in and/or executable by, the processing circuitry  20 , in particular as module in the controller. Radio node  10  also comprises radio circuitry  22  providing receiving and transmitting or transceiving functionality (e.g., one or more transmitters and/or receivers and/or transceivers), the radio circuitry  22  being connected or connectable to the processing circuitry. An antenna circuitry  24  of the radio node  10  is connected or connectable to the radio circuitry  22  to collect or send and/or amplify signals. Radio circuitry  22  and the processing circuitry  20  controlling it are configured for cellular communication with a network, e.g. a RAN as described herein, and/or for sidelink communication (which may be within coverage of the cellular network, or out of coverage; and/or may be considered non-cellular communication and/or be associated to a non-cellular wireless communication network). Radio node  10  may generally be adapted to carry out any of the methods of operating a radio node like terminal or UE disclosed herein; in particular, it may comprise corresponding circuitry, e.g. processing circuitry, and/or modules, e.g. software modules. It may be considered that the radio node  10  comprises, and/or is connected or connectable, to a power supply. 
       FIG. 5  schematically show a radio node  100 , which may in particular be implemented as a network node  100  or signaling radio node, for example an eNB or gNB or similar for NR. Radio node  100  comprises processing circuitry (which may also be referred to as control circuitry)  120 , which may comprise a controller connected to a memory. Any module, e.g. transmitting module and/or receiving module and/or configuring module of the node  100  may be implemented in and/or executable by the processing circuitry  120 . The processing circuitry  120  is connected to control radio circuitry  122  of the node  100 , which provides receiver and transmitter and/or transceiver functionality (e.g., comprising one or more transmitters and/or receivers and/or transceivers). An antenna circuitry  124  may be connected or connectable to radio circuitry  122  for signal reception or transmittance and/or amplification. Node  100  may be adapted to carry out any of the methods for operating a radio node or network node disclosed herein; in particular, it may comprise corresponding circuitry, e.g. processing circuitry, and/or modules. The antenna circuitry  124  may be connected to and/or comprise an antenna array. The node  100 , respectively its circuitry, may be adapted to perform any of the methods of operating a network node or a radio node as described herein; in particular, it may comprise corresponding circuitry, e.g. processing circuitry, and/or modules. The radio node  100  may generally comprise communication circuitry, e.g. for communication with another network node, like a radio node, and/or with a core network and/or an internet or local net, in particular with an information system, which may provide information and/or data to be transmitted to a user equipment. 
     In general, a clear channel assessment (CCA) procedure may comprise monitoring and/or performing measurements on a frequency range and/or channel and/or carrier and/or spectrum; in some cases a CCA procedure may also be referred to as LBT procedure; e.g., if only one CCA is performed for a LBT procedure. In particular, the CCA procedure may comprise determining whether a channel or frequency range or spectrum or carrier is occupied, for example based on one or more parameters, e.g. measured or monitored energy and/or power and/or signal strength and/or energy density and/or power density or similar. A CCA procedure may be performed and/or pertain to a specific time interval (also referred to as CCA duration), for example a measuring or monitoring interval over which measurement and/or monitoring is performed. The CCA procedure may be performed and/or pertain to a specific frequency range (also referred to as CCA frequency range), for example a measurement and/or monitoring range. The CCA frequency range may be part of and/or comprise the frequency range and/or carrier and/or spectrum and/or channel to be accessed (which may be referred to as access target frequency range, or access target in short; accessing in this context may be considered to refer to transmitting signaling on the range and/or carrier and/or spectrum). The CCA frequency range may be considered representative of the access target frequency range in terms of occupation status (occupied or non-occupied). A CCA procedure may indicate whether the access target is occupied or not, for example by comparing measurement results with one or more threshold values. For example, if the measured power or energy over the CCA duration is lower than an occupancy threshold, the access target may be considered unoccupied; if it reaches or is higher than the threshold, it may be considered occupied. A determination as unoccupied may be considered a positive result; a determination of occupied may be considered a negative result. A Listen-Before-Talk procedure (LBT) may comprise one or more CCA procedure in an LBT time interval, for example with the same duration and/or same condition or threshold for positive result, or with different durations and/or different conditions or thresholds. An LBT procedure may be considered positive if a threshold number of CCAs of the LBT procedure are positive, for example each or half, and/or a minimum consecutive in time are positive. A positive LBT and/or CCA procedure may allow access to the access target for transmission, for example to be accessed within an access time interval. Access (permission to transmit) may be valid for a channel occupation time (COT); the maximum time of access may be a maximum COT (M-COT). The time of access may be referred to as transmission duration (which may be as long as the M-COT or shorter). A radio node like a wireless device does not have to transmit the whole M-COT after successful CCA/LBT. It may be considered that part of the M-COT is passed on to another device, which then may transmit (using the rest of the M-COT), e.g. upon and/or based on suitable control signaling; this may be particularly useful in a centralised system. For example, in centralised system, a base station may initiate an access, transmit DL signaling to a wireless device scheduled for UL transmission such that the wireless device transmits within the M-COT after the DL transmission has ended, e.g. due to suitable scheduling information. The device performing successful access to start transmission at the beginning of a M-COT or COT may be considered the device initiating a COT or M-COT. Depending on whether there is a gap between transmissions of different device, one or more CCA procedures (in particular, shorter in total than for initiation) may have to be performed by the device taking over transmission. If a LBT procedure was unsuccessful, a device may be required to backoff (e.g., not trying to access for a backoff time interval, which may be predefined or random). Accessing and/or transmitting on an access target frequency range may comprise on the whole bandwidth of the frequency range, or on part of it, for example interleaved and/or in a contiguous part and/or utilising frequency hopping, and/or may be based on allocated and/or scheduled and/or configured resources, for example in time domain (e.g., for a number of symbols or a time interval) and/or frequency domain (e.g., as in terms of frequency subranges and/or subcarriers and/or PRBs and/or groups of PRBs assigned for transmission, e.g. allocated or scheduled or configured). 
     Data signaling may be on a data channel, for example on a PDSCH or PSSCH, or on a dedicated data channel, e.g. for low latency and/or high reliability, e.g. a URLLC channel. Control signaling may be on a control channel, for example on a common control channel or a PDCCH or PDCCH, and/or comprise one or more DCI messages or SCI messages. Reference signaling may be associated to control signaling and/or data signaling, e.g. DM-RS and/or PT-RS. 
     Communicating may comprise transmitting or receiving. It may be considered that communicating like transmitting signaling is based on a SC-FDM based waveform, and/or corresponds to a Frequency Domain Filtered (FDF) DFTS-OFDM waveform. However, the approaches may be applied to a Single Carrier based waveform, e.g. a SC-FDM or SC-FDE-waveform, which may be pulse-shaped/FDF-based. It should be noted that SC-FDM may be considered DFT-spread OFDM, such that SC-FDM and DFTS-OFDM may be used interchangeably. Alternatively, or additionally, the signaling (e.g., first signaling and/or second signaling) and/or beam/s (in particular, the first received beam and/or second received beam) may be based on a waveform with CP or comparable guard time. The received beam and the transmission beam of the first beam pair may have the same (or similar) or different angular and/or spatial extensions; the received beam and the transmission beam of the second beam pair may have the same (or similar) or different angular and/or spatial extensions. It may be considered that the received beam and/or transmission beam of the first and/or second beam pair have angular extension of 20 degrees or less, or 15 degrees or less, or 10 or 5 degrees or less, at least in one of horizontal or vertical direction, or both; different beams may have different angular extensions. An extended guard interval or switching protection interval may have a duration corresponding to essentially or at least N CP (cyclic prefix) durations or equivalent duration, wherein N may be 2, or 3 or 4. An equivalent to a CP duration may represent the CP duration associated to signaling with CP (e.g., SC-FDM-based or OFDM-based) for a waveform without CP with the same or similar symbol time duration as the signaling with CP. Pulse-shaping (and/or performing FDF for) a modulation symbol and/or signaling, e.g. associated to a first subcarrier or bandwidth, may comprise mapping the modulation symbol (and/or the sample associated to it after FFT) to an associated second subcarrier or part of the bandwidth, and/or applying a shaping operation regarding the power and/or amplitude and/or phase of the modulation symbol on the first subcarrier and the second subcarrier, wherein the shaping operation may be according to a shaping function. Pulse-shaping signaling may comprise pulse-shaping one or more symbols; pulse-shaped signaling may in general comprise at least one pulse-shaped symbol. Pulse-shaping may be performed based on a Nyquist-filter. It may be considered that pulse-shaping is performed based on periodically extending a frequency distribution of modulation symbols (and/or associated samples after FFT) over a first number of subcarrier to a larger, second number of subcarriers, wherein a subset of the first number of subcarriers from one end of the frequency distribution is appended at the other end of the first number of subcarriers. 
     In some variants, communicating may be based on a numerology (which may, e.g., be represented by and/or correspond to and/or indicate a subcarrier spacing and/or symbol time length) and/or an SC-FDM based waveform (including a FDF-DFTS-FDM based waveform) or a single-carrier based waveform. Whether to use pulse-shaping or FDF on a SC-FDM or SC-based waveform may depend on the modulation scheme (e.g., MCS) used. Such waveforms may utilise a cyclic prefix and/or benefit particularly from the described approaches. Communicating may comprise and/or be based on beamforming, e.g. transmission beamforming and/or reception beamforming, respectively. It may be considered that a beam is produced by performing analog beamforming to provide the beam, e.g. a beam corresponding to a reference beam. Thus, signaling may be adapted, e.g. based on movement of the communication partner. A beam may for example be produced by performing analog beamforming to provide a beam corresponding to a reference beam. This allows efficient postprocessing of a digitally formed beam, without requiring changes to a digital beamforming chain and/or without requiring changes to a standard defining beam forming precoders. In general, a beam may be produced by hybrid beamforming, and/or by digital beamforming, e.g. based on a precoder. This facilitates easy processing of beams, and/or limits the number of power amplifiers/ADC/DCA required for antenna arrangements. It may be considered that a beam is produced by hybrid beamforming, e.g. by analog beamforming performed on a beam representation or beam formed based on digital beamforming. Monitoring and/or performing cell search may be based on reception beamforming, e.g. analog or digital or hybrid reception beamforming. The numerology may determine the length of a symbol time interval and/or the duration of a cyclic prefix. The approaches described herein are particularly suitable to SC-FDM, to ensure orthogonality, in particular subcarrier orthogonality, in corresponding systems, but may be used for other waveforms. Communicating may comprise utilising a waveform with cyclic prefix. The cyclic prefix may be based on a numerology, and may help keeping signaling orthogonal. Communicating may comprise, and/or be based on performing cell search, e.g. for a wireless device or terminal, or may comprise transmitting cell identifying signaling and/or a selection indication, based on which a radio node receiving the selection indication may select a signaling bandwidth from a set of signaling bandwidths for performing cell search. 
     A beam or beam pair may in general be targeted at one radio node, or a group of radio nodes and/or an area including one or more radio nodes. In many cases, a beam or beam pair may be receiver-specific (e.g., UE-specific), such that only one radio node is served per beam/beam pair. A beam pair switch or switch of received beam (e.g., by using a different reception beam) and/or transmission beam may be performed at a border of a transmission timing structure, e.g. a slot border, or within a slot, for example between symbols Some tuning of radio circuitry, e.g. for receiving and/or transmitting, may be performed. Beam pair switching may comprise switching from a second received beam to a first received beam, and/or from a second transmission beam to a first transmission beam. Switching may comprise inserting a guard period to cover retuning time; however, circuitry may be adapted to switch sufficiently quickly to essentially be instantaneous; this may in particular be the case when digital reception beamforming is used to switch reception beams for switching received beams. 
     A reference beam may be a beam comprising reference signaling, based on which for example a of beam signaling characteristics may be determined, e.g. measured and/or estimated. A signaling beam may comprise signaling like control signaling and/or data signaling and/or reference signaling. A reference beam may be transmitted by a source or transmitting radio node, in which case one or more beam signaling characteristics may be reported to it from a receiver, e.g. a wireless device. However, in some cases it may be received by the radio node from another radio node or wireless device. In this case, one or more beam signaling characteristics may be determined by the radio node. A signaling beam may be a transmission beam, or a reception beam. A set of signaling characteristics may comprise a plurality of subsets of beam signaling characteristics, each subset pertaining to a different reference beam. Thus, a reference beam may be associated to different beam signaling characteristics. 
     A beam signaling characteristic, respectively a set of such characteristics, may represent and/or indicate a signal strength and/or signal quality of a beam and/or a delay characteristic and/or be associated with received and/or measured signaling carried on a beam. Beam signaling characteristics and/or delay characteristics may in particular pertain to, and/or indicate, a number and/or list and/or order of beams with best (e.g., lowest mean delay and/or lowest spread/range) timing or delay spread, and/or of strongest and/or best quality beams, e.g. with associated delay spread. A beam signaling characteristic may be based on measurement/s performed on reference signaling carried on the reference beam it pertains to. The measurement/s may be performed by the radio node, or another node or wireless device. The use of reference signaling allows improved accuracy and/or gauging of the measurements. In some cases, a beam and/or beam pair may be represented by a beam identity indication, e.g. a beam or beam pair number. Such an indication may be represented by one or more signaling sequences (e.g., a specific reference signaling sequences or sequences), which may be transmitted on the beam and/or beam pair, and/or a signaling characteristic and/or a resource/s used (e.g., time/frequency and/or code) and/or a specific RNTI (e.g., used for scrambling a CRC for some messages or transmissions) and/or by information provided in signaling, e.g. control signaling and/or system signaling, on the beam and/or beam pair, e.g. encoded and/or provided in an information field or as information element in some form of message of signaling, e.g. DCI and/or MAC and/or RRC signaling. 
     A reference beam may in general be one of a set of reference beams, the second set of reference beams being associated to the set of signaling beams. The sets being associated may refer to at least one beam of the first set being associated and/or corresponding to the second set (or vice versa), e.g. being based on it, for example by having the same analog or digital beamforming parameters and/or precoder and/or the same shape before analog beamforming, and/or being a modified form thereof, e.g. by performing additional analog beamforming. The set of signaling beams may be referred to as a first set of beams, a set of corresponding reference beams may be referred to as second set of beams. 
     In some variants, a reference beam and/or reference beams and/or reference signaling may correspond to and/or carry random access signaling, e.g. a random access preamble. Such a reference beam or signaling may be transmitted by another radio node. The signaling may indicate which beam is used for transmitting. Alternatively, the reference beams may be beams receiving the random access signaling. Random access signaling may be used for initial connection to the radio node and/or a cell provided by the radio node, and/or for reconnection. Utilising random access signaling facilitates quick and early beam selection. The random access signaling may be on a random access channel, e.g. based on broadcast information provided by the radio node (the radio node performing the beam selection), e.g. with synchronisation signaling (e.g., SSB block and/or associated thereto). The reference signaling may correspond to synchronisation signaling, e.g. transmitted by the radio node in a plurality of beams. The characteristics may be reported on by a node receiving the synchronisation signaling, e.g. in a random access process, e.g. a msg3 for contention resolution, which may be transmitted on a physical uplink shared channel based on a resource allocation provided by the radio node. 
     A delay characteristic (which may correspond to delay spread information) and/or a measurement report may represent and/or indicate at least one of mean delay, and/or delay spread, and/or delay distribution, and/or delay spread distribution, and/or delay spread range, and/or relative delay spread, and/or energy (or power) distribution, and/or impulse response to received signaling, and/or the power delay profile of the received signals, and/or power delay profile related parameters of the received signal. A mean delay may represent the mean value and/or an averaged value of the delay spread, which may be weighted or unweighted. A distribution may be distribution over time/delay, e.g. of received power and/or energy of a signal. A range may indicate an interval of the delay spread distribution over time/delay, which may cover a predetermined percentage of the delay spread respective received energy or power, e.g. 50% or more, 75% or more, 90% or more, or 100%. A relative delay spread may indicate a relation to a threshold delay, e.g. of the mean delay, and/or a shift relative to an expected and/or configured timing, e.g. a timing at which the signaling would have been expected based on the scheduling, and/or a relation to a cyclic prefix duration (which may be considered on form of a threshold). Energy distribution or power distribution may pertain to the energy or power received over the time interval of the delay spread. A power delay profile may pertain to representations of the received signals, or the received signals energy/power, across time/delay. Power delay profile related parameters may pertain to metrics computed from the power delay profile. Different values and forms of delay spread information and/or report may be used, allowing a wide range of capabilities. The kind of information represented by a measurement report may be predefined, or be configured or configurable, e.g. with a measurement configuration and/or reference signaling configuration, in particular with higher layer signaling like RRC or MAC signaling and/or physical layer signaling like DCI signaling. 
     In general, different beam pair may differ in at least one beam; for example, a beam pair using a first received beam and a first transmission beam may be considered to be different from a second beam pair using the first received beam and a second transmission beam. A transmission beam using no precoding and/or beamforming, for example using the natural antenna profile, may be considered as a special form of transmission beam of a transmission beam pair. A beam may be indicated to a radio node by a transmitter with a beam indication and/or a configuration, which for example may indicate beam parameters and/or time/frequency resources associated to the beam and/or a transmission mode and/or antenna profile and/or antenna port and/or precoder associated to the beam. Different beams may be provided with different content, for example different received beams may carry different signaling; however, there may be considered cases in which different beams carry the same signaling, for example the same data signaling and/or reference signaling. The beams may be transmitted by the same node and/or transmission point and/or antenna arrangement, or by different nodes and/or transmission points and/or antenna arrangements. 
     Communicating utilising a beam pair or a beam may comprise receiving signaling on a received beam (which may be a beam of a beam pair), and/or transmitting signaling on a beam, e.g. a beam of a beam pair. The following terms are to be interpreted from the point of view of the referred radio node: a received beam may be a beam carrying signaling received by the radio node (for reception, the radio node may use a reception beam, e.g. directed to the received beam, or be non-beamformed). A transmission beam may be a beam used by the radio node to transmit signaling. A beam pair may consist of a received beam and a transmission beam. The transmission beam and the received beam of a beam pair may be associated to each and/or correspond to each other, e.g. such that signaling on the received beam and signaling on a transmission beam travel essentially the same path (but in opposite directions), e.g. at least in a stationary or almost stationary condition. It should be noted that the terms “first” and “second” do not necessarily denote an order in time; a second signaling may be received and/or transmitted before, or in some cases simultaneous to, first signaling, or vice versa. The received beam and transmission beam of a beam pair may be on the same carrier or frequency range or bandwidth part, e.g. in a TDD operation; however, variants with FDD may be considered as well. Different beam pairs may operate on the same frequency ranges or carriers or bandwidth parts (e.g., such that transmission beams operate on the same frequency range or carriers or bandwidth part, and received beams on the same frequency range or carriers or bandwidth part (the transmission beam and received beams may be on the same or different ranges or carriers or BWPs). Communicating utilizing a first beam pair and/or first beam may be based on, and/or comprise, switching from the second beam pair or second beam to the first beam pair or first beam for communicating. The switching may be controlled by the network, for example a network node (which may be the source or transmitter of the received beam of the first beam pair and/or second beam pair, or be associated thereto, for example associated transmission points or nodes in dual connectivity). Such controlling may comprise transmitting control signaling, e.g. physical layer signaling and/or higher layer signaling. In some cases, the switching may be performed by the radio node without additional control signaling, for example based on measurements on signal quality and/or signal strength of beam pairs (e.g., of first and second received beams), in particular the first beam pair and/or the second beam pair. For example, it may be switched to the first beam pair (or first beam) if the signal quality or signal strength measured on the second beam pair (or second beam) is considered to be insufficient, and/or worse than corresponding measurements on the first beam pair indicate. Measurements performed on a beam pair (or beam) may in particular comprise measurements performed on a received beam of the beam pair. It may be considered that the timing indication may be determined before switching from the second beam pair to the first beam pair for communicating. Thus, the synchronization may be in place 8 and/or the timing indication may be available for synchronising) when starting communication utilizing the first beam pair or first beam. However, in some cases the timing indication may be determined after switching to the first beam pair or first beam. This may be in particular useful if first signaling is expected to be received after the switching only, for example based on a periodicity or scheduled timing of suitable reference signaling on the first beam pair, e.g. first received beam. 
     In some variants, reference signaling may be and/or comprise CSI-RS, e.g. transmitted by the network node. In other variants, the reference signaling may be transmitted by a UE, e.g. to a network node or other UE, in which case it may comprise and/or be Sounding Reference Signaling. Other, e.g. new, forms of reference signaling may be considered and/or used. In general, a modulation symbol of reference signaling respectively a resource element carrying it may be associated to a cyclic prefix. 
     Data signaling may be on a data channel, for example on a PDSCH or PSSCH, or on a dedicated data channel, e.g. for low latency and/or high reliability, e.g. a URLLC channel. Control signaling may be on a control channel, for example on a common control channel or a PDCCH or PSCCH, and/or comprise one or more DCI messages or SCI messages. Reference signaling may be associated to control signaling and/or data signaling, e.g. DM-RS and/or PT-RS. 
     Reference signaling, for example, may comprise DM-RS and/or pilot signaling and/or discovery signaling and/or synchronisation signaling and/or sounding signaling and/or phase tracking signaling and/or cell-specific reference signaling and/or user-specific signaling, in particular CSI-RS. Reference signaling in general may be signaling with one or more signaling characteristics, in particular transmission power and/or sequence of modulation symbols and/or resource distribution and/or phase distribution known to the receiver. Thus, the receiver can use the reference signaling as a reference and/or for training and/or for compensation. The receiver can be informed about the reference signaling by the transmitter, e.g. being configured and/or signaling with control signaling, in particular physical layer signaling and/or higher layer signaling (e.g., DCI and/or RRC signaling), and/or may determine the corresponding information itself, e.g. a network node configuring a UE to transmit reference signaling. Reference signaling may be signaling comprising one or more reference symbols and/or structures. Reference signaling may be adapted for gauging and/or estimating and/or representing transmission conditions, e.g. channel conditions and/or transmission path conditions and/or channel (or signal or transmission) quality. It may be considered that the transmission characteristics (e.g., signal strength and/or form and/or modulation and/or timing) of reference signaling are available for both transmitter and receiver of the signaling (e.g., due to being predefined and/or configured or configurable and/or being communicated). Different types of reference signaling may be considered, e.g. pertaining to uplink, downlink or sidelink, cell-specific (in particular, cell-wide, e.g., CRS) or device or user specific (addressed to a specific target or user equipment, e.g., CSI-RS), demodulation-related (e.g., DMRS) and/or signal strength related, e.g. power-related or energy-related or amplitude-related (e.g., SRS or pilot signaling) and/or phase-related, etc. 
     References to specific resource structures like an allocation unit and/or block symbol and/or block symbol group and/or transmission timing structure and/or symbol and/or slot and/or mini-slot and/or subcarrier and/or carrier may pertain to a specific numerology, which may be predefined and/or configured or configurable. A transmission timing structure may represent a time interval, which may cover one or more symbols. Some examples of a transmission timing structure are transmission time interval (TTI), subframe, slot and mini-slot. A slot may comprise a predetermined, e.g. predefined and/or configured or configurable, number of symbols, e.g. 6 or 7, or 12 or 14. A mini-slot may comprise a number of symbols (which may in particular be configurable or configured) smaller than the number of symbols of a slot, in particular 1, 2, 3 or 4, or more symbols, e.g. less symbols than symbols in a slot. A transmission timing structure may cover a time interval of a specific length, which may be dependent on symbol time length and/or cyclic prefix used. A transmission timing structure may pertain to, and/or cover, a specific time interval in a time stream, e.g. synchronized for communication. Timing structures used and/or scheduled for transmission, e.g. slot and/or mini-slots, may be scheduled in relation to, and/or synchronized to, a timing structure provided and/or defined by other transmission timing structures. Such transmission timing structures may define a timing grid, e.g., with symbol time intervals within individual structures representing the smallest timing units. Such a timing grid may for example be defined by slots or subframes (wherein in some cases, subframes may be considered specific variants of slots). A transmission timing structure may have a duration (length in time) determined based on the durations of its symbols, possibly in addition to cyclic prefix/es used. The symbols of a transmission timing structure may have the same duration, or may in some variants have different duration. The number of symbols in a transmission timing structure may be predefined and/or configured or configurable, and/or be dependent on numerology. The timing of a mini-slot may generally be configured or configurable, in particular by the network and/or a network node. The timing may be configurable to start and/or end at any symbol of the transmission timing structure, in particular one or more slots. 
     A transmission quality parameter may in general correspond to the number R of retransmissions and/or number T of total transmissions, and/or coding (e.g., number of coding bits, e.g. for error detection coding and/or error correction coding like FEC coding) and/or code rate and/or BLER and/or BER requirements and/or transmission power level (e.g., minimum level and/or target level and/or base power level P0 and/or transmission power control command, TPC, step size) and/or signal quality, e.g. SNR and/or SIR and/or SINR and/or power density and/or energy density. 
     A buffer state report (or buffer status report, BSR) may comprise information representing the presence and/or size of data to be transmitted (e.g., available in one or more buffers, for example provided by higher layers). The size may be indicated explicitly, and/or indexed to range/s of sizes, and/or may pertain to one or more different channel/s and/or acknowledgement processes and/or higher layers and/or channel groups/s, e.g., one or more logical channel/s and/or transport channel/s and/or groups thereof: The structure of a BSR may be predefined and/or configurable of configured, e.g. to override and/or amend a predefined structure, for example with higher layer signaling, e.g. RRC signaling. There may be different forms of BSR with different levels of resolution and/or information, e.g. a more detailed long BSR and a less detailed short BSR. A short BSR may concatenate and/or combine information of a long BSR, e.g. providing sums for data available for one or more channels and/or or channels groups and/or buffers, which might be represented individually in a long BSR; and/or may index a less-detailed range scheme for data available or buffered. A BSR may be used in lieu of a scheduling request, e.g. by a network node scheduling or allocating (uplink) resources for the transmitting radio node like a wireless device or UE or IAB node. 
     There is generally considered a program product comprising instructions adapted for causing processing and/or control circuitry to carry out and/or control any method described herein, in particular when executed on the processing and/or control circuitry. Also, there is considered a carrier medium arrangement carrying and/or storing a program product as described herein. 
     A carrier medium arrangement may comprise one or more carrier media. Generally, a carrier medium may be accessible and/or readable and/or receivable by processing or control circuitry. Storing data and/or a program product and/or code may be seen as part of carrying data and/or a program product and/or code. A carrier medium generally may comprise a guiding/transporting medium and/or a storage medium. A guiding/transporting medium may be adapted to carry and/or carry and/or store signals, in particular electromagnetic signals and/or electrical signals and/or magnetic signals and/or optical signals. A carrier medium, in particular a guiding/transporting medium, may be adapted to guide such signals to carry them. A carrier medium, in particular a guiding/transporting medium, may comprise the electromagnetic field, e.g. radio waves or microwaves, and/or optically transmissive material, e.g. glass fiber, and/or cable. A storage medium may comprise at least one of a memory, which may be volatile or non-volatile, a buffer, a cache, an optical disc, magnetic memory, flash memory, etc. 
     A system comprising one or more radio nodes as described herein, in particular a network node and a user equipment, is described. The system may be a wireless communication system, and/or provide and/or represent a radio access network. 
     Moreover, there may be generally considered a method of operating an information system, the method comprising providing information. Alternatively, or additionally, an information system adapted for providing information may be considered. Providing information may comprise providing information for, and/or to, a target system, which may comprise and/or be implemented as radio access network and/or a radio node, in particular a network node or user equipment or terminal. Providing information may comprise transferring and/or streaming and/or sending and/or passing on the information, and/or offering the information for such and/or for download, and/or triggering such providing, e.g. by triggering a different system or node to stream and/or transfer and/or send and/or pass on the information. The information system may comprise, and/or be connected or connectable to, a target, for example via one or more intermediate systems, e.g. a core network and/or internet and/or private or local network. Information may be provided utilising and/or via such intermediate system/s. Providing information may be for radio transmission and/or for transmission via an air interface and/or utilising a RAN or radio node as described herein. Connecting the information system to a target, and/or providing information, may be based on a target indication, and/or adaptive to a target indication. A target indication may indicate the target, and/or one or more parameters of transmission pertaining to the target and/or the paths or connections over which the information is provided to the target. Such parameter/s may in particular pertain to the air interface and/or radio access network and/or radio node and/or network node. Example parameters may indicate for example type and/or nature of the target, and/or transmission capacity (e.g., data rate) and/or latency and/or reliability and/or cost, respectively one or more estimates thereof. The target indication may be provided by the target, or determined by the information system, e.g. based on information received from the target and/or historical information, and/or be provided by a user, for example a user operating the target or a device in communication with the target, e.g. via the RAN and/or air interface. For example, a user may indicate on a user equipment communicating with the information system that information is to be provided via a RAN, e.g. by selecting from a selection provided by the information system, for example on a user application or user interface, which may be a web interface. An information system may comprise one or more information nodes. An information node may generally comprise processing circuitry and/or communication circuitry. In particular, an information system and/or an information node may be implemented as a computer and/or a computer arrangement, e.g. a host computer or host computer arrangement and/or server or server arrangement. In some variants, an interaction server (e.g., web server) of the information system may provide a user interface, and based on user input may trigger transmitting and/or streaming information provision to the user (and/or the target) from another server, which may be connected or connectable to the interaction server and/or be part of the information system or be connected or connectable thereto. The information may be any kind of data, in particular data intended for a user of for use at a terminal, e.g. video data and/or audio data and/or location data and/or interactive data and/or game-related data and/or environmental data and/or technical data and/or traffic data and/or vehicular data and/or circumstantial data and/or operational data. The information provided by the information system may be mapped to, and/or mappable to, and/or be intended for mapping to, communication or data signaling and/or one or more data channels as described herein (which may be signaling or channel/s of an air interface and/or used within a RAN and/or for radio transmission). It may be considered that the information is formatted based on the target indication and/or target, e.g. regarding data amount and/or data rate and/or data structure and/or timing, which in particular may be pertaining to a mapping to communication or data signaling and/or a data channel. Mapping information to data signaling and/or data channel/s may be considered to refer to using the signaling/channel/s to carry the data, e.g. on higher layers of communication, with the signaling/channel/s underlying the transmission. A target indication generally may comprise different components, which may have different sources, and/or which may indicate different characteristics of the target and/or communication path/s thereto. A format of information may be specifically selected, e.g. from a set of different formats, for information to be transmitted on an air interface and/or by a RAN as described herein. This may be particularly pertinent since an air interface may be limited in terms of capacity and/or of predictability, and/or potentially be cost sensitive. The format may be selected to be adapted to the transmission indication, which may in particular indicate that a RAN or radio node as described herein is in the path (which may be the indicated and/or planned and/or expected path) of information between the target and the information system. A (communication) path of information may represent the interface/s (e.g., air and/or cable interfaces) and/or the intermediate system/s (if any), between the information system and/or the node providing or transferring the information, and the target, over which the information is, or is to be, passed on. A path may be (at least partly) undetermined when a target indication is provided, and/or the information is provided/transferred by the information system, e.g. if an internet is involved, which may comprise multiple, dynamically chosen paths. Information and/or a format used for information may be packet-based, and/or be mapped, and/or be mappable and/or be intended for mapping, to packets. Alternatively, or additionally, there may be considered a method for operating a target device comprising providing a target indicating to an information system. More alternatively, or additionally, a target device may be considered, the target device being adapted for providing a target indication to an information system. 
     In another approach, there may be considered a target indication tool adapted for, and/or comprising an indication module for, providing a target indication to an information system. The target device may generally be a target as described above. A target indication tool may comprise, and/or be implemented as, software and/or application or app, and/or web interface or user interface, and/or may comprise one or more modules for implementing actions performed and/or controlled by the tool. The tool and/or target device may be adapted for, and/or the method may comprise, receiving a user input, based on which a target indicating may be determined and/or provided. Alternatively, or additionally, the tool and/or target device may be adapted for, and/or the method may comprise, receiving information and/or communication signaling carrying information, and/or operating on, and/or presenting (e.g., on a screen and/or as audio or as other form of indication), information. The information may be based on received information and/or communication signaling carrying information. Presenting information may comprise processing received information, e.g. decoding and/or transforming, in particular between different formats, and/or for hardware used for presenting. Operating on information may be independent of or without presenting, and/or proceed or succeed presenting, and/or may be without user interaction or even user reception, for example for automatic processes, or target devices without (e.g., regular) user interaction like MTC devices, of for automotive or transport or industrial use. The information or communication signaling may be expected and/or received based on the target indication. Presenting and/or operating on information may generally comprise one or more processing steps, in particular decoding and/or executing and/or interpreting and/or transforming information. Operating on information may generally comprise relaying and/or transmitting the information, e.g. on an air interface, which may include mapping the information onto signaling (such mapping may generally pertain to one or more layers, e.g. one or more layers of an air interface, e.g. RLC (Radio Link Control) layer and/or MAC layer and/or physical layer/s). The information may be imprinted (or mapped) on communication signaling based on the target indication, which may make it particularly suitable for use in a RAN (e.g., for a target device like a network node or in particular a UE or terminal). The tool may generally be adapted for use on a target device, like a UE or terminal. Generally, the tool may provide multiple functionalities, e.g. for providing and/or selecting the target indication, and/or presenting, e.g. video and/or audio, and/or operating on and/or storing received information. Providing a target indication may comprise transmitting or transferring the indication as signaling, and/or carried on signaling, in a RAN, for example if the target device is a UE, or the tool for a UE. It should be noted that such provided information may be transferred to the information system via one or more additionally communication interfaces and/or paths and/or connections. The target indication may be a higher-layer indication and/or the information provided by the information system may be higher-layer information, e.g. application layer or user-layer, in particular above radio layers like transport layer and physical layer. The target indication may be mapped on physical layer radio signaling, e.g. related to or on the user-plane, and/or the information may be mapped on physical layer radio communication signaling, e.g. related to or on the user-plane (in particular, in reverse communication directions). The described approaches allow a target indication to be provided, facilitating information to be provided in a specific format particularly suitable and/or adapted to efficiently use an air interface. A user input may for example represent a selection from a plurality of possible transmission modes or formats, and/or paths, e.g. in terms of data rate and/or packaging and/or size of information to be provided by the information system. 
     In general, a numerology and/or subcarrier spacing may indicate the bandwidth (in frequency domain) of a subcarrier of a carrier, and/or the number of subcarriers in a carrier and/or the numbering of the subcarriers in a carrier, and/or the symbol time length. Different numerologies may in particular be different in the bandwidth of a subcarrier. In some variants, all the subcarriers in a carrier have the same bandwidth associated to them. The numerology and/or subcarrier spacing may be different between carriers in particular regarding the subcarrier bandwidth. A symbol time length, and/or a time length of a timing structure pertaining to a carrier may be dependent on the carrier frequency, and/or the subcarrier spacing and/or the numerology. In particular, different numerologies may have different symbol time lengths, even on the same carrier. 
     Signaling may generally comprise one or more (e.g., modulation) symbols and/or signals and/or messages. A signal may comprise or represent one or more bits. An indication may represent signaling, and/or be implemented as a signal, or as a plurality of signals. One or more signals may be included in and/or represented by a message. Signaling, in particular control signaling, may comprise a plurality of signals and/or messages, which may be transmitted on different carriers and/or be associated to different signaling processes, e.g. representing and/or pertaining to one or more such processes and/or corresponding information. An indication may comprise signaling, and/or a plurality of signals and/or messages and/or may be comprised therein, which may be transmitted on different carriers and/or be associated to different acknowledgement signaling processes, e.g. representing and/or pertaining to one or more such processes. Signaling associated to a channel may be transmitted such that represents signaling and/or information for that channel, and/or that the signaling is interpreted by the transmitter and/or receiver to belong to that channel. Such signaling may generally comply with transmission parameters and/or format/s for the channel. 
     An antenna arrangement may comprise one or more antenna elements (radiating elements), which may be combined in antenna arrays. An antenna array or subarray may comprise one antenna element, or a plurality of antenna elements, which may be arranged e.g. two dimensionally (for example, a panel) or three dimensionally. It may be considered that each antenna array or subarray or element is separately controllable, respectively that different antenna arrays are controllable separately from each other. A single antenna element/radiator may be considered the smallest example of a subarray. Examples of antenna arrays comprise one or more multi-antenna panels or one or more individually controllable antenna elements. An antenna arrangement may comprise a plurality of antenna arrays. It may be considered that an antenna arrangement is associated to a (specific and/or single) radio node, e.g. a configuring or informing or scheduling radio node, e.g. to be controlled or controllable by the radio node. An antenna arrangement associated to a UE or terminal may be smaller (e.g., in size and/or number of antenna elements or arrays) than the antenna arrangement associated to a network node. Antenna elements of an antenna arrangement may be configurable for different arrays, e.g. to change the beamforming characteristics. In particular, antenna arrays may be formed by combining one or more independently or separately controllable antenna elements or subarrays. The beams may be provided by analog beamforming, or in some variants by digital beamforming, or by hybrid beamforming combing analog and digital beamforming. The informing radio nodes may be configured with the manner of beam transmission, e.g. by transmitting a corresponding indicator or indication, for example as beam identify indication. However, there may be considered cases in which the informing radio node/s are not configured with such information, and/or operate transparently, not knowing the way of beamforming used. An antenna arrangement may be considered separately controllable in regard to the phase and/or amplitude/power and/or gain of a signal feed to it for transmission, and/or separately controllable antenna arrangements may comprise an independent or separate transmit and/or receive unit and/or ADC (Analog-Digital-Converter, alternatively an ADC chain) or DCA (Digital-to-Analog Converter, alternatively a DCA chain) to convert digital control information into an analog antenna feed for the whole antenna arrangement (the ADC/DCA may be considered part of, and/or connected or connectable to, antenna circuitry) or vice versa. A scenario in which an ADC or DCA is controlled directly for beamforming may be considered an analog beamforming scenario; such controlling may be performed after encoding/decoding and/or after modulation symbols have been mapped to resource elements. This may be on the level of antenna arrangements using the same ADC/DCA, e.g. one antenna element or a group of antenna elements associated to the same ADC/DCA. Digital beamforming may correspond to a scenario in which processing for beamforming is provided before feeding signaling to the ADC/DCA, e.g. by using one or more precoder/s and/or by precoding information, for example before and/or when mapping modulation symbols to resource elements. Such a precoder for beamforming may provide weights, e.g. for amplitude and/or phase, and/or may be based on a (precoder) codebook, e.g. selected from a codebook. A precoder may pertain to one beam or more beams, e.g. defining the beam or beams. The codebook may be configured or configurable, and/or be predefined. DFT beamforming may be considered a form of digital beamforming, wherein a DFT procedure is used to form one or more beams. Hybrid forms of beamforming may be considered. 
     A beam may be defined by a spatial and/or angular and/or spatial angular distribution of radiation and/or a spatial angle (also referred to as solid angle) or spatial (solid) angle distribution into which radiation is transmitted (for transmission beamforming) or from which it is received (for reception beamforming). Reception beamforming may comprise only accepting signals coming in from a reception beam (e.g., using analog beamforming to not receive outside reception beam/s), and/or sorting out signals that do not come in in a reception beam, e.g. in digital postprocessing, e.g. digital beamforming. A beam may have a solid angle equal to or smaller than 4*pi sr (4*pi correspond to a beam covering all directions), in particular smaller than 2*pi, or pi, or pi/2, or pi/4 or pi/8 or pi/16. In particular for high frequencies, smaller beams may be used. Different beams may have different directions and/or sizes (e.g., solid angle and/or reach). A beam may have a main direction, which may be defined by a main lobe (e.g., center of the main lobe, e.g. pertaining to signal strength and/or solid angle, which may be averaged and/or weighted to determine the direction), and may have one or more sidelobes. A lobe may generally be defined to have a continuous or contiguous distribution of energy and/or power transmitted and/or received, e.g. bounded by one or more contiguous or contiguous regions of zero energy (or practically zero energy). A main lobe may comprise the lobe with the largest signal strength and/or energy and/or power content. However, sidelobes usually appear due to limitations of beamforming, some of which may carry signals with significant strength, and may cause multi-path effects. A sidelobe may generally have a different direction than a main lobe and/or other side lobes, however, due to reflections a sidelobe still may contribute to transmitted and/or received energy or power. A beam may be swept and/or switched over time, e.g., such that its (main) direction is changed, but its shape (angular/solid angle distribution) around the main direction is not changed, e.g. from the transmitter&#39;s views for a transmission beam, or the receiver&#39;s view for a reception beam, respectively. Sweeping may correspond to continuous or near continuous change of main direction (e.g., such that after each change, the main lobe from before the change covers at least partly the main lobe after the change, e.g. at least to 50 or 75 or 90 percent). Switching may correspond to switching direction non-continuously, e.g. such that after each change, the main lobe from before the change does not cover the main lobe after the change, e.g. at most to 50 or 25 or 10 percent. 
     Signal strength may be a representation of signal power and/or signal energy, e.g. as seen from a transmitting node or a receiving node. A beam with larger strength at transmission (e.g., according to the beamforming used) than another beam does may not necessarily have larger strength at the receiver, and vice versa, for example due to interference and/or obstruction and/or dispersion and/or absorption and/or reflection and/or attrition or other effects influencing a beam or the signaling it carries. Signal quality may in general be a representation of how well a signal may be received over noise and/or interference. A beam with better signal quality than another beam does not necessarily have a larger beam strength than the other beam. Signal quality may be represented for example by SIR, SNR, SINR, BER, BLER, Energy per resource element over noise/interference or another corresponding quality measure. Signal quality and/or signal strength may pertain to, and/or may be measured with respect to, a beam, and/or specific signaling carried by the beam, e.g. reference signaling and/or a specific channel, e.g. a data channel or control channel. Signal strength may be represented by received signal strength, and/or relative signal strength, e.g. in comparison to a reference signal (strength). 
     Uplink or sidelink signaling may be OFDMA (Orthogonal Frequency Division Multiple Access) or SC-FDMA (Single Carrier Frequency Division Multiple Access) signaling. Downlink signaling may in particular be OFDMA signaling. However, signaling is not limited thereto (Filter-Bank based signaling and/or Single-Carrier based signaling, e.g. SC-FDE signaling, may be considered alternatives). 
     A radio node may generally be considered a device or node adapted for wireless and/or radio (and/or millimeter wave) frequency communication, and/or for communication utilising an air interface, e.g. according to a communication standard. 
     A radio node may be a network node, or a user equipment or terminal. A network node may be any radio node of a wireless communication network, e.g. a base station and/or gNodeB (gNB) and/or eNodeB (eNB) and/or relay node and/or micro/nano/pico/femto node and/or transmission point (TP) and/or access point (AP) and/or other node, in particular for a RAN or other wireless communication network as described herein. 
     The terms user equipment (UE) and terminal may be considered to be interchangeable in the context of this disclosure. A wireless device, user equipment or terminal may represent an end device for communication utilising the wireless communication network, and/or be implemented as a user equipment according to a standard. Examples of user equipments may comprise a phone like a smartphone, a personal communication device, a mobile phone or terminal, a computer, in particular laptop, a sensor or machine with radio capability (and/or adapted for the air interface), in particular for MTC (Machine-Type-Communication, sometimes also referred to M2M, Machine-To-Machine), or a vehicle adapted for wireless communication. A user equipment or terminal may be mobile or stationary. A wireless device generally may comprise, and/or be implemented as, processing circuitry and/or radio circuitry, which may comprise one or more chips or sets of chips. The circuitry and/or circuitries may be packaged, e.g. in a chip housing, and/or may have one or more physical interfaces to interact with other circuitry and/or for power supply. Such a wireless device may be intended for use in a user equipment or terminal. 
     A radio node may generally comprise processing circuitry and/or radio circuitry. A radio node, in particular a network node, may in some cases comprise cable circuitry and/or communication circuitry, with which it may be connected or connectable to another radio node and/or a core network. 
     Circuitry may comprise integrated circuitry. Processing circuitry may comprise one or more processors and/or controllers (e.g., microcontrollers), and/or ASICs (Application Specific Integrated Circuitry) and/or FPGAs (Field Programmable Gate Array), or similar. It may be considered that processing circuitry comprises, and/or is (operatively) connected or connectable to one or more memories or memory arrangements. A memory arrangement may comprise one or more memories. A memory may be adapted to store digital information. Examples for memories comprise volatile and non-volatile memory, and/or Random Access Memory (RAM), and/or Read-Only-Memory (ROM), and/or magnetic and/or optical memory, and/or flash memory, and/or hard disk memory, and/or EPROM or EEPROM (Erasable Programmable ROM or Electrically Erasable Programmable ROM). 
     Radio circuitry may comprise one or more transmitters and/or receivers and/or transceivers (a transceiver may operate or be operable as transmitter and receiver, and/or may comprise joint or separated circuitry for receiving and transmitting, e.g. in one package or housing), and/or may comprise one or more amplifiers and/or oscillators and/or filters, and/or may comprise, and/or be connected or connectable to antenna circuitry and/or one or more antennas and/or antenna arrays. An antenna array may comprise one or more antennas, which may be arranged in a dimensional array, e.g. 2D or 3D array, and/or antenna panels. A remote radio head (RRH) may be considered as an example of an antenna array. However, in some variants, an RRH may be also be implemented as a network node, depending on the kind of circuitry and/or functionality implemented therein. 
     Communication circuitry may comprise radio circuitry and/or cable circuitry. Communication circuitry generally may comprise one or more interfaces, which may be air interface/s and/or cable interface/s and/or optical interface/s, e.g. laser-based. Interface/s may be in particular packet-based. Cable circuitry and/or a cable interfaces may comprise, and/or be connected or connectable to, one or more cables (e.g., optical fiber-based and/or wire-based), which may be directly or indirectly (e.g., via one or more intermediate systems and/or interfaces) be connected or connectable to a target, e.g. controlled by communication circuitry and/or processing circuitry. 
     Any one or all of the modules disclosed herein may be implemented in software and/or firmware and/or hardware. Different modules may be associated to different components of a radio node, e.g. different circuitries or different parts of a circuitry. It may be considered that a module is distributed over different components and/or circuitries. A program product as described herein may comprise the modules related to a device on which the program product is intended (e.g., a user equipment or network node) to be executed (the execution may be performed on, and/or controlled by the associated circuitry). 
     A wireless communication network may be or comprise a radio access network and/or a backhaul network (e.g. a relay or backhaul network or an IAB network), and/or a Radio Access Network (RAN) in particular according to a communication standard. A communication standard may in particular a standard according to 3GPP and/or 5G, e.g. according to NR or LTE, in particular LTE Evolution. 
     A wireless communication network may be and/or comprise a Radio Access Network (RAN), which may be and/or comprise any kind of cellular and/or wireless radio network, which may be connected or connectable to a core network. The approaches described herein are particularly suitable for a 5G network, e.g. LTE Evolution and/or NR (New Radio), respectively successors thereof. A RAN may comprise one or more network nodes, and/or one or more terminals, and/or one or more radio nodes. A network node may in particular be a radio node adapted for radio and/or wireless and/or cellular communication with one or more terminals. A terminal may be any device adapted for radio and/or wireless and/or cellular communication with or within a RAN, e.g. a user equipment (UE) or mobile phone or smartphone or computing device or vehicular communication device or device for machine-type-communication (MTC), etc. A terminal may be mobile, or in some cases stationary. A RAN or a wireless communication network may comprise at least one network node and a UE, or at least two radio nodes. There may be generally considered a wireless communication network or system, e.g. a RAN or RAN system, comprising at least one radio node, and/or at least one network node and at least one terminal. 
     Transmitting in downlink may pertain to transmission from the network or network node to the terminal. Transmitting in uplink may pertain to transmission from the terminal to the network or network node. Transmitting in sidelink may pertain to (direct) transmission from one terminal to another. Uplink, downlink and sidelink (e.g., sidelink transmission and reception) may be considered communication directions. In some variants, uplink and downlink may also be used to described wireless communication between network nodes, e.g. for wireless backhaul and/or relay communication and/or (wireless) network communication for example between base stations or similar network nodes, in particular communication terminating at such. It may be considered that backhaul and/or relay communication and/or network communication is implemented as a form of sidelink or uplink communication or similar thereto. 
     Control information or a control information message or corresponding signaling (control signaling) may be transmitted on a control channel, e.g. a physical control channel, which may be a downlink channel or (or a sidelink channel in some cases, e.g. one UE scheduling another UE). For example, control information/allocation information may be signaled by a network node on PDCCH (Physical Downlink Control Channel) and/or a PDSCH (Physical Downlink Shared Channel) and/or a HARQ-specific channel. Acknowledgement signaling, e.g. as a form of control information or signaling like uplink control information/signaling, may be transmitted by a terminal on a PUCCH (Physical Uplink Control Channel) and/or PUSCH (Physical Uplink Shared Channel) and/or a HARQ-specific channel. Multiple channels may apply for multi-component/multi-carrier indication or signaling. 
     Transmitting acknowledgement signaling may in general be based on and/or in response to subject transmission, and/or to control signaling scheduling subject transmission. Such control signaling and/or subject signaling may be transmitted by a signaling radio node (which may be a network node, and/or a node associated to it, e.g. in a dual connectivity scenario. Subject transmission and/or subject signaling may be transmission or signaling to which ACK/NACK or acknowledgement information pertains, e.g. indicating correct or incorrect reception and/or decoding of the subject transmission or signaling. Subject signaling or transmission may in particular comprise and/or be represented by data signaling, e.g. on a PDSCH or PSSCH, or some forms of control signaling, e.g. on a PDCCH or PSSCH, for example for specific formats. 
     A signaling characteristic may be based on a type or format of a scheduling grant and/or scheduling assignment, and/or type of allocation, and/or timing of acknowledgement signaling and/or the scheduling grant and/or scheduling assignment, and/or resources associated to acknowledgement signaling and/or the scheduling grant and/or scheduling assignment. For example, if a specific format for a scheduling grant (scheduling or allocating the allocated resources) or scheduling assignment (scheduling the subject transmission for acknowledgement signaling) is used or detected, the first or second communication resource may be used. Type of allocation may pertain to dynamic allocation (e.g., using DCI/PDCCH) or semi-static allocation (e.g., for a configured grant). Timing of acknowledgement signaling may pertain to a slot and/or symbol/s the signaling is to be transmitted. Resources used for acknowledgement signaling may pertain to the allocated resources. Timing and/or resources associated to a scheduling grant or assignment may represent a search space or CORESET (a set of resources configured for reception of PDCCH transmissions) in which the grant or assignment is received. Thus, which transmission resource to be used may be based on implicit conditions, requiring low signaling overhead. 
     Scheduling may comprise indicating, e.g. with control signaling like DCI or SCI signaling and/or signaling on a control channel like PDCCH or PSCCH, one or more scheduling opportunities of a configuration intended to carry data signaling or subject signaling. The configuration may be represented or representable by, and/or correspond to, a table. A scheduling assignment may for example point to an opportunity of the reception allocation configuration, e.g. indexing a table of scheduling opportunities. In some cases, a reception allocation configuration may comprise 15 or 16 scheduling opportunities. The configuration may in particular represent allocation in time. It may be considered that the reception allocation configuration pertains to data signaling, in particular on a physical data channel like PDSCH or PSSCH. In general, the reception allocation configuration may pertain to downlink signaling, or in some scenarios to sidelink signaling. Control signaling scheduling subject transmission like data signaling may point and/or index and/or refer to and/or indicate a scheduling opportunity of the reception allocation configuration. It may be considered that the reception allocation configuration is configured or configurable with higher-layer signaling, e.g. RRC or MAC layer signaling. The reception allocation configuration may be applied and/or applicable and/or valid for a plurality of transmission timing intervals, e.g. such that for each interval, one or more opportunities may be indicated or allocated for data signaling. These approaches allow efficient and flexible scheduling, which may be semi-static, but may updated or reconfigured on useful timescales in response to changes of operation conditions. 
     Control information, e.g., in a control information message, in this context may in particular be implemented as and/or represented by a scheduling assignment, which may indicate subject transmission for feedback (transmission of acknowledgement signaling), and/or reporting timing and/or frequency resources and/or code resources. Reporting timing may indicate a timing for scheduled acknowledgement signaling, e.g. slot and/or symbol and/or resource set. Control information may be carried by control signaling. 
     Subject transmissions may comprise one or more individual transmissions. Scheduling assignments may comprise one or more scheduling assignments. It should generally be noted that in a distributed system, subject transmissions, configuration and/or scheduling may be provided by different nodes or devices or transmission points. Different subject transmissions may be on the same carrier or different carriers (e.g., in a carrier aggregation), and/or same or different bandwidth parts, and/or on the same or different layers or beams, e.g. in a MIMO scenario, and/or to same or different ports. Generally, subject transmissions may pertain to different HARQ or ARQ processes (or different sub-processes, e.g. in MIMO with different beams/layers associated to the same process identifier, but different sub-process-identifiers like swap bits). A scheduling assignment and/or a HARQ codebook may indicate a target HARQ structure. A target HARQ structure may for example indicate an intended HARQ response to a subject transmission, e.g. the number of bits and/or whether to provide code block group level response or not. However, it should be noted that the actual structure used may differ from the target structure, e.g. due to the total size of target structures for a subpattern being larger than the predetermined size. 
     Transmitting acknowledgement signaling, also referred to as transmitting acknowledgement information or feedback information or simply as ARQ or HARQ feedback or feedback or reporting feedback, may comprise, and/or be based on determining correct or incorrect reception of subject transmission/s, e.g. based on error coding and/or based on scheduling assignment/s scheduling the subject transmissions. Transmitting acknowledgement information may be based on, and/or comprise, a structure for acknowledgement information to transmit, e.g. the structure of one or more subpatterns, e.g. based on which subject transmission is scheduled for an associated subdivision. Transmitting acknowledgement information may comprise transmitting corresponding signaling, e.g. at one instance and/or in one message and/or one channel, in particular a physical channel, which may be a control channel. In some cases, the channel may be a shared channel or data channel, e.g. utilising rate-matching of the acknowledgment information. The acknowledgement information may generally pertain to a plurality of subject transmissions, which may be on different channels and/or carriers, and/or may comprise data signaling and/or control signaling. The acknowledgment information may be based on a codebook, which may be based on one or more size indications and/or assignment indications (representing HARQ structures), which may be received with a plurality of control signalings and/or control messages, e.g. in the same or different transmission timing structures, and/or in the same or different (target) sets of resources. Transmitting acknowledgement information may comprise determining the codebook, e.g. based on control information in one or more control information messages and/or a configuration. A codebook may pertain to transmitting acknowledgement information at a single and/or specific instant, e.g. a single PUCCH or PUSCH transmission, and/or in one message or with jointly encoded and/or modulated acknowledgement information. Generally, acknowledgment information may be transmitted together with other control information, e.g. a scheduling request and/or measurement information. 
     Acknowledgement signaling may in some cases comprise, next to acknowledgement information, other information, e.g. control information, in particular, uplink or sidelink control information, like a scheduling request and/or measurement information, or similar, and/or error detection and/or correction information, respectively associated bits. The payload size of acknowledgement signaling may represent the number of bits of acknowledgement information, and/or in some cases the total number of bits carried by the acknowledgement signaling, and/or the number of resource elements needed. Acknowledgement signaling and/or information may pertain to ARQ and/or HARQ processes; an ARQ process may provide ACK/NACK (and perhaps additional feedback) feedback, and decoding may be performed on each (re-)transmission separately, without soft-buffering/soft-combining intermediate data, whereas HARQ may comprise soft-buffering/soft-combining of intermediate data of decoding for one or more (re-)transmissions. 
     Subject transmission may be data signaling or control signaling. The transmission may be on a shared or dedicated channel. Data signaling may be on a data channel, for example on a PDSCH or PSSCH, or on a dedicated data channel, e.g. for low latency and/or high reliability, e.g. a URLLC channel. Control signaling may be on a control channel, for example on a common control channel or a PDCCH or PSCCH, and/or comprise one or more DCI messages or SCI messages. In some cases, the subject transmission may comprise, or represent, reference signaling. For example, it may comprise DM-RS and/or pilot signaling and/or discovery signaling and/or sounding signaling and/or phase tracking signaling and/or cell-specific reference signaling and/or user-specific signaling, in particular CSI-RS. A subject transmission may pertain to one scheduling assignment and/or one acknowledgement signaling process (e.g., according to identifier or subidentifier), and/or one subdivision. In some cases, a subject transmission may cross the borders of subdivisions in time, e.g. due to being scheduled to start in one subdivision and extending into another, or even crossing over more than one subdivision. In this case, it may be considered that the subject transmission is associated to the subdivision it ends in. 
     It may be considered that transmitting acknowledgement information, in particular of acknowledgement information, is based on determining whether the subject transmission/s has or have been received correctly, e.g. based on error coding and/or reception quality. Reception quality may for example be based on a determined signal quality. Acknowledgement information may generally be transmitted to a signaling radio node and/or node arrangement and/or to a network and/or network node. 
     Acknowledgement information, or bit/s of a subpattern structure of such information (e.g., an acknowledgement information structure, may represent and/or comprise one or more bits, in particular a pattern of bits. Multiple bits pertaining to a data structure or substructure or message like a control message may be considered a subpattern. The structure or arrangement of acknowledgement information may indicate the order, and/or meaning, and/or mapping, and/or pattern of bits (or subpatterns of bits) of the information. The structure or mapping may in particular indicate one or more data block structures, e.g. code blocks and/or code block groups and/or transport blocks and/or messages, e.g. command messages, the acknowledgement information pertains to, and/or which bits or subpattern of bits are associated to which data block structure. In some cases, the mapping may pertain to one or more acknowledgement signaling processes, e.g. processes with different identifiers, and/or one or more different data streams. The configuration or structure or codebook may indicate to which process/es and/or data stream/s the information pertains. Generally, the acknowledgement information may comprise one or more subpatterns, each of which may pertain to a data block structure, e.g. a code block or code block group or transport block. A subpattern may be arranged to indicate acknowledgement or non-acknowledgement, or another retransmission state like non-scheduling or non-reception, of the associated data block structure. It may be considered that a subpattern comprises one bit, or in some cases more than one bit. It should be noted that acknowledgement information may be subjected to significant processing before being transmitted with acknowledgement signaling. Different configurations may indicate different sizes and/or mapping and/or structures and/or pattern. 
     An acknowledgment signaling process (providing acknowledgment information) may be a HARQ process, and/or be identified by a process identifier, e.g. a HARQ process identifier or subidentifier. Acknowledgement signaling and/or associated acknowledgement information may be referred to as feedback or acknowledgement feedback. It should be noted that data blocks or structures to which subpatterns may pertain may be intended to carry data (e.g., information and/or systemic and/or coding bits). However, depending on transmission conditions, such data may be received or not received (or not received correctly), which may be indicated correspondingly in the feedback. In some cases, a subpattern of acknowledgement signaling may comprise padding bits, e.g. if the acknowledgement information for a data block requires fewer bits than indicated as size of the subpattern. Such may for example happen if the size is indicated by a unit size larger than required for the feedback. 
     Acknowledgment information may generally indicate at least ACK or NACK, e.g. pertaining to an acknowledgment signaling process, or an element of a data block structure like a data block, subblock group or subblock, or a message, in particular a control message. Generally, to an acknowledgment signaling process there may be associated one specific subpattern and/or a data block structure, for which acknowledgment information may be provided. Acknowledgement information may comprise a plurality of pieces of information, represented in a plurality of ARQ and/or HARQ structures. 
     An acknowledgment signaling process may determine correct or incorrect reception, and/or corresponding acknowledgement information, of a data block like a transport block, and/or substructures thereof, based on coding bits associated to the data block, and/or based on coding bits associated to one or more data block and/or subblocks and/or subblock group/s. Acknowledgement information (determined by an acknowledgement signaling process) may pertain to the data block as a whole, and/or to one or more subblocks or subblock groups. A code block may be considered an example of a subblock, whereas a code block group may be considered an example of a subblock group. Accordingly, the associated subpattern may comprise one or more bits indicating reception status or feedback of the data block, and/or one or more bits indicating reception status or feedback of one or more subblocks or subblock groups. Each subpattern or bit of the subpattern may be associated and/or mapped to a specific data block or subblock or subblock group. In some variants, correct reception for a data block may be indicated if all subblocks or subblock groups are correctly identified. In such a case, the subpattern may represent acknowledgement information for the data block as a whole, reducing overhead in comparison to provide acknowledgement information for the subblocks or subblock groups. The smallest structure (e.g. subblock/subblock group/data block) the subpattern provides acknowledgement information for and/or is associated to may be considered its (highest) resolution. In some variants, a subpattern may provide acknowledgment information regarding several elements of a data block structure and/or at different resolution, e.g. to allow more specific error detection. For example, even if a subpattern indicates acknowledgment signaling pertaining to a data block as a whole, in some variants higher resolution (e.g., subblock or subblock group resolution) may be provided by the subpattern. A subpattern may generally comprise one or more bits indicating ACK/NACK for a data block, and/or one or more bits for indicating ACK/NACK for a subblock or subblock group, or for more than one subblock or subblock group. 
     A subblock and/or subblock group may comprise information bits (representing the data to be transmitted, e.g. user data and/or downlink/sidelink data or uplink data). It may be considered that a data block and/or subblock and/or subblock group also comprises error one or more error detection bits, which may pertain to, and/or be determined based on, the information bits (for a subblock group, the error detection bit/s may be determined based on the information bits and/or error detection bits and/or error correction bits of the subblock/s of the subblock group). A data block or substructure like subblock or subblock group may comprise error correction bits, which may in particular be determined based on the information bits and error detection bits of the block or substructure, e.g. utilising an error correction coding scheme, in particular for forward error correction (FEC), e.g. LDPC or polar coding and/or turbo coding. Generally, the error correction coding of a data block structure (and/or associated bits) may cover and/or pertain to information bits and error detection bits of the structure. A subblock group may represent a combination of one or more code blocks, respectively the corresponding bits. A data block may represent a code block or code block group, or a combination of more than one code block groups. A transport block may be split up in code blocks and/or code block groups, for example based on the bit size of the information bits of a higher layer data structure provided for error coding and/or size requirements or preferences for error coding, in particular error correction coding. Such a higher layer data structure is sometimes also referred to as transport block, which in this context represents information bits without the error coding bits described herein, although higher layer error handling information may be included, e.g. for an internet protocol like TCP. However, such error handling information represents information bits in the context of this disclosure, as the acknowledgement signaling procedures described treat it accordingly. 
     In some variants, a subblock like a code block may comprise error correction bits, which may be determined based on the information bit/s and/or error detection bit/s of the subblock. An error correction coding scheme may be used for determining the error correction bits, e.g. based on LDPC or polar coding or Reed-Mueller coding. In some cases, a subblock or code block may be considered to be defined as a block or pattern of bits comprising information bits, error detection bit/s determined based on the information bits, and error correction bit/s determined based on the information bits and/or error detection bit/s. It may be considered that in a subblock, e.g. code block, the information bits (and possibly the error correction bit/s) are protected and/or covered by the error correction scheme or corresponding error correction bit/s. A code block group may comprise one or more code blocks. In some variants, no additional error detection bits and/or error correction bits are applied, however, it may be considered to apply either or both. A transport block may comprise one or more code block groups. It may be considered that no additional error detection bits and/or error correction bits are applied to a transport block, however, it may be considered to apply either or both. In some specific variants, the code block group/s comprise no additional layers of error detection or correction coding, and the transport block may comprise only additional error detection coding bits, but no additional error correction coding. This may particularly be true if the transport block size is larger than the code block size and/or the maximum size for error correction coding. A subpattern of acknowledgement signaling (in particular indicating ACK or NACK) may pertain to a code block, e.g. indicating whether the code block has been correctly received. It may be considered that a subpattern pertains to a subgroup like a code block group or a data block like a transport block. In such cases, it may indicate ACK, if all subblocks or code blocks of the group or data/transport block are received correctly (e.g. based on a logical AND operation), and NACK or another state of non-correct reception if at least one subblock or code block has not been correctly received. It should be noted that a code block may be considered to be correctly received not only if it actually has been correctly received, but also if it can be correctly reconstructed based on soft-combining and/or the error correction coding. 
     A subpattern/HARQ structure may pertain to one acknowledgement signaling process and/or one carrier like a component carrier and/or data block structure or data block. It may in particular be considered that one (e.g. specific and/or single) subpattern pertains, e.g. is mapped by the codebook, to one (e.g., specific and/or single) acknowledgement signaling process, e.g. a specific and/or single HARQ process. It may be considered that in the bit pattern, subpatterns are mapped to acknowledgement signaling processes and/or data blocks or data block structures on a one-to-one basis. In some variants, there may be multiple subpatterns (and/or associated acknowledgment signaling processes) associated to the same component carrier, e.g. if multiple data streams transmitted on the carrier are subject to acknowledgement signaling processes. A subpattern may comprise one or more bits, the number of which may be considered to represent its size or bit size. Different bit n-tupels (n being 1 or larger) of a subpattern may be associated to different elements of a data block structure (e.g., data block or subblock or subblock group), and/or represent different resolutions. There may be considered variants in which only one resolution is represented by a bit pattern, e.g. a data block. A bit n-tupel may represent acknowledgement information (also referred to a feedback), in particular ACK or NACK, and optionally, (if n&gt;1), may represent DTX/DRX or other reception states. ACK/NACK may be represented by one bit, or by more than one bit, e.g. to improve disambiguity of bit sequences representing ACK or NACK, and/or to improve transmission reliability. 
     The acknowledgement information or feedback information may pertain to a plurality of different transmissions, which may be associated to and/or represented by data block structures, respectively the associated data blocks or data signaling. The data block structures, and/or the corresponding blocks and/or signaling, may be scheduled for simultaneous transmission, e.g. for the same transmission timing structure, in particular within the same slot or subframe, and/or on the same symbol/s. However, alternatives with scheduling for non-simultaneous transmission may be considered. For example, the acknowledgment information may pertain to data blocks scheduled for different transmission timing structures, e.g. different slots (or mini-slots, or slots and mini-slots) or similar, which may correspondingly be received (or not or wrongly received). Scheduling signaling may generally comprise indicating resources, e.g. time and/or frequency resources, for example for receiving or transmitting the scheduled signaling. 
     Signaling may generally be considered to represent an electromagnetic wave structure (e.g., over a time interval and frequency interval), which is intended to convey information to at least one specific or generic (e.g., anyone who might pick up the signaling) target. A process of signaling may comprise transmitting the signaling. Transmitting signaling, in particular control signaling or communication signaling, e.g. comprising or representing acknowledgement signaling and/or resource requesting information, may comprise encoding and/or modulating. Encoding and/or modulating may comprise error detection coding and/or forward error correction encoding and/or scrambling. Receiving control signaling may comprise corresponding decoding and/or demodulation. Error detection coding may comprise, and/or be based on, parity or checksum approaches, e.g. CRC (Cyclic Redundancy Check). Forward error correction coding may comprise and/or be based on for example turbo coding and/or Reed-Muller coding, and/or polar coding and/or LDPC coding (Low Density Parity Check). The type of coding used may be based on the channel (e.g., physical channel) the coded signal is associated to. A code rate may represent the ratio of the number of information bits before encoding to the number of encoded bits after encoding, considering that encoding adds coding bits for error detection coding and forward error correction. Coded bits may refer to information bits (also called systematic bits) plus coding bits. 
     Communication signaling may comprise, and/or represent, and/or be implemented as, data signaling, and/or user plane signaling. Communication signaling may be associated to a data channel, e.g. a physical downlink channel or physical uplink channel or physical sidelink channel, in particular a PDSCH (Physical Downlink Shared Channel) or PSSCH (Physical Sidelink Shared Channel). Generally, a data channel may be a shared channel or a dedicated channel. Data signaling may be signaling associated to and/or on a data channel. 
     An indication generally may explicitly and/or implicitly indicate the information it represents and/or indicates. Implicit indication may for example be based on position and/or resource used for transmission. Explicit indication may for example be based on a parametrisation with one or more parameters, and/or one or more index or indices, and/or one or more bit patterns representing the information. It may in particular be considered that control signaling as described herein, based on the utilised resource sequence, implicitly indicates the control signaling type. 
     A resource element may generally describe the smallest individually usable and/or encodable and/or decodable and/or modulatable and/or demodulatable time-frequency resource, and/or may describe a time-frequency resource covering a symbol time length in time and a subcarrier in frequency. A signal may be allocatable and/or allocated to a resource element. A subcarrier may be a subband of a carrier, e.g. as defined by a standard. A carrier may define a frequency and/or frequency band for transmission and/or reception. In some variants, a signal (jointly encoded/modulated) may cover more than one resource elements. A resource element may generally be as defined by a corresponding standard, e.g. NR or LTE. As symbol time length and/or subcarrier spacing (and/or numerology) may be different between different symbols and/or subcarriers, different resource elements may have different extension (length/width) in time and/or frequency domain, in particular resource elements pertaining to different carriers. 
     A resource generally may represent a time-frequency and/or code resource, on which signaling, e.g. according to a specific format, may be communicated, for example transmitted and/or received, and/or be intended for transmission and/or reception. 
     A border symbol (or allocation unit) may generally represent a starting symbol (allocation unit) or an ending symbol (allocation unit) for transmitting and/or receiving. A starting symbol (or allocation unit) may in particular be a starting symbol of uplink or sidelink signaling, for example control signaling or data signaling. Such signaling may be on a data channel or control channel, e.g. a physical channel, in particular a physical uplink shared channel (like PUSCH) or a sidelink data or shared channel, or a physical uplink control channel (like PUCCH) or a sidelink control channel. If the starting symbol (or allocation unit) is associated to control signaling (e.g., on a control channel), the control signaling may be in response to received signaling (in sidelink or downlink), e.g. representing acknowledgement signaling associated thereto, which may be HARQ or ARQ signaling. An ending symbol (or allocation unit) may represent an ending symbol (in time) of downlink or sidelink transmission or signaling, which may be intended or scheduled for the radio node or user equipment. Such downlink signaling may in particular be data signaling, e.g. on a physical downlink channel like a shared channel, e.g. a PDSCH (Physical Downlink Shared Channel). A starting symbol (or allocation unit) may be determined based on, and/or in relation to, such an ending symbol (or allocation unit). 
     Configuring a radio node, in particular a terminal or user equipment, may refer to the radio node being adapted or caused or set and/or instructed to operate according to the configuration. Configuring may be done by another device, e.g., a network node (for example, a radio node of the network like a base station or eNodeB) or network, in which case it may comprise transmitting configuration data to the radio node to be configured. Such configuration data may represent the configuration to be configured and/or comprise one or more instruction pertaining to a configuration, e.g. a configuration for transmitting and/or receiving on allocated resources, in particular frequency resources. A radio node may configure itself, e.g., based on configuration data received from a network or network node. A network node may utilise, and/or be adapted to utilise, its circuitry/ies for configuring. Allocation information may be considered a form of configuration data. Configuration data may comprise and/or be represented by configuration information, and/or one or more corresponding indications and/or message/s 
     Generally, configuring may include determining configuration data representing the configuration and providing, e.g. transmitting, it to one or more other nodes (parallel and/or sequentially), which may transmit it further to the radio node (or another node, which may be repeated until it reaches the wireless device). Alternatively, or additionally, configuring a radio node, e.g., by a network node or other device, may include receiving configuration data and/or data pertaining to configuration data, e.g., from another node like a network node, which may be a higher-level node of the network, and/or transmitting received configuration data to the radio node. Accordingly, determining a configuration and transmitting the configuration data to the radio node may be performed by different network nodes or entities, which may be able to communicate via a suitable interface, e.g., an X2 interface in the case of LTE or a corresponding interface for NR. Configuring a terminal may comprise scheduling downlink and/or uplink transmissions for the terminal, e.g. downlink data and/or downlink control signaling and/or DCI and/or uplink control or data or communication signaling, in particular acknowledgement signaling, and/or configuring resources and/or a resource pool therefor. 
     A resource structure may be considered to be neighbored in frequency domain by another resource structure, if they share a common border frequency, e.g. one as an upper frequency border and the other as a lower frequency border. Such a border may for example be represented by the upper end of a bandwidth assigned to a subcarrier n, which also represents the lower end of a bandwidth assigned to a subcarrier n+1. A resource structure may be considered to be neighbored in time domain by another resource structure, if they share a common border time, e.g. one as an upper (or right in the figures) border and the other as a lower (or left in the figures) border. Such a border may for example be represented by the end of the symbol time interval assigned to a symbol n, which also represents the beginning of a symbol time interval assigned to a symbol n+1. 
     Generally, a resource structure being neighbored by another resource structure in a domain may also be referred to as abutting and/or bordering the other resource structure in the domain. 
     A resource structure may in general represent a structure in time and/or frequency domain, in particular representing a time interval and a frequency interval. A resource structure may comprise and/or be comprised of resource elements, and/or the time interval of a resource structure may comprise and/or be comprised of symbol time interval/s, and/or the frequency interval of a resource structure may comprise and/or be comprised of subcarrier/s. A resource element may be considered an example for a resource structure, a slot or mini-slot or a Physical Resource Block (PRB) or parts thereof may be considered others. A resource structure may be associated to a specific channel, e.g. a PUSCH or PUCCH, in particular resource structure smaller than a slot or PRB. 
     Examples of a resource structure in frequency domain comprise a bandwidth or band, or a bandwidth part. A bandwidth part may be a part of a bandwidth available for a radio node for communicating, e.g. due to circuitry and/or configuration and/or regulations and/or a standard. A bandwidth part may be configured or configurable to a radio node. In some variants, a bandwidth part may be the part of a bandwidth used for communicating, e.g. transmitting and/or receiving, by a radio node. The bandwidth part may be smaller than the bandwidth (which may be a device bandwidth defined by the circuitry/configuration of a device, and/or a system bandwidth, e.g. available for a RAN). It may be considered that a bandwidth part comprises one or more resource blocks or resource block groups, in particular one or more PRBs or PRB groups. A bandwidth part may pertain to, and/or comprise, one or more carriers. A resource structure may in time domain comprise and/or represent a time interval, e.g. one of more allocation units and/or symbols and/or slots and/or subframes. In general, any reference to a symbol as a time interval may be considered as a reference to an allocation unit as a more general term, unless the reference to the symbol is specific, e.g. referring to a specific division or modulation technique, or to modulation symbols as transmission structures. 
     A carrier may generally represent a frequency range or band and/or pertain to a central frequency and an associated frequency interval. It may be considered that a carrier comprises a plurality of subcarriers. A carrier may have assigned to it a central frequency or center frequency interval, e.g. represented by one or more subcarriers (to each subcarrier there may be generally assigned a frequency bandwidth or interval). Different carriers may be non-overlapping, and/or may be neighboring in frequency domain. 
     It should be noted that the term “radio” in this disclosure may be considered to pertain to wireless communication in general, and may also include wireless communication utilising millimeter waves, in particular above one of the thresholds 10 GHz or 20 GHz or 50 GHz or 52 GHz or 52.6 GHz or 60 GHz or 72 GHz or 100 GHz or 114 GHz. Such communication may utilise one or more carriers, e.g. in FDD and/or carrier aggregation. Upper frequency boundaries may correspond to 300 GHz or 200 GHz or 120 GHz or any of the thresholds larger than the one representing the lower frequency boundary. 
     A radio node, in particular a network node or a terminal, may generally be any device adapted for transmitting and/or receiving radio and/or wireless signals and/or data, in particular communication data, in particular on at least one carrier. The at least one carrier may comprise a carrier accessed based on an LBT procedure (which may be called LBT carrier), e.g., an unlicensed carrier. It may be considered that the carrier is part of a carrier aggregate. 
     Receiving or transmitting on a cell or carrier may refer to receiving or transmitting utilizing a frequency (band) or spectrum associated to the cell or carrier. A cell may generally comprise and/or be defined by or for one or more carriers, in particular at least one carrier for UL communication/transmission (called UL carrier) and at least one carrier for DL communication/transmission (called DL carrier). It may be considered that a cell comprises different numbers of UL carriers and DL carriers. Alternatively, or additionally, a cell may comprise at least one carrier for UL communication/transmission and DL communication/transmission, e.g., in TDD-based approaches. 
     A channel may generally be a logical, transport or physical channel. A channel may comprise and/or be arranged on one or more carriers, in particular a plurality of subcarriers. A channel carrying and/or for carrying control signaling/control information may be considered a control channel, in particular if it is a physical layer channel and/or if it carries control plane information. Analogously, a channel carrying and/or for carrying data signaling/user information may be considered a data channel, in particular if it is a physical layer channel and/or if it carries user plane information. A channel may be defined for a specific communication direction, or for two complementary communication directions (e.g., UL and DL, or sidelink in two directions), in which case it may be considered to have two component channels, one for each direction. Examples of channels comprise a channel for low latency and/or high reliability transmission, in particular a channel for Ultra-Reliable Low Latency Communication (URLLC), which may be for control and/or data. 
     A control region generally may comprise time and/or frequency domain resources. A control region may be intended and/or indicated and/or configured, e.g. with higher layer signaling, for transmission of control signaling, in particular first control signaling. A control region may be periodic or aperiodic; in some cases, it may repeat at certain time intervals (e.g., within a larger time interval) or be set or triggered or indicated for limited usage, e.g. in general in relation to a timing structure like a frame structure associated to the wireless communication network and/or used therein. A control region may be represented by a CORESET or a resource set in time and/or frequency domain. To a control region, there may be associated a search space. The search space may contain and/or be based on the control region. In this disclosure, features associated to a control region may be associated to the associated search space and vice versa. A search space may provide parameters and/or features associated to control signaling to be expected and/or processed and/or received and/or transmitted on resource of the control region, e.g. one or more signaling characteristics of control signaling associated to the search space, e.g. type of control signaling (e.g., format) and/or allowable aggregation level and/or possible location in the control region. It should be noted that the control region may be shifted in time domain from the perspective of the transmitter and receiver, e.g. due to delay effects and/or travel time of signaling. However, the same term will be used for both perspectives, as there will be an unambiguous association; in particular, the transmitter will intend reception in the control region of the receiver. A control region and/or search space may be configured by a network, e.g. a transmitting radio node, e.g. with higher layer signaling and/or broadcast signaling. A search space may be device-specific (e.g., configured specifically for one device, and/or with unicast signaling) or a common search space, e.g. configured with multicast and/or broadcast signaling. A control region may span one or more block symbols and/or allocation units and/or have an extension in frequency domain corresponding to a control region bandwidth and/or a plurality of subcarriers or resource blocks, e.g. physical and/or virtual resource blocks. It should be noted that control signaling of the set of control signalings may comprise control signaling that may occupy time/frequency resource/s (e.g., a set of resources) included in the control region and/or search space, but do not necessarily have to use all resources of the control region and/or search space. In general, the control region and/or search space may represent resources (e.g., a set of time/frequency resources) a receiver may monitor and/or search for control signaling, e.g. control signaling addressed to and/or intended for the receiver. Parameters and/or characteristics of the search space may limit and/or define the monitoring in more detail. 
     In general, a symbol or allocation unit may represent and/or be associated to a symbol time length (or unit time length), which may be dependent on the carrier and/or subcarrier spacing and/or numerology of the associated carrier. Accordingly, a symbol may be considered to indicate a time interval having a symbol time length in relation to frequency domain. A symbol time length may be dependent on a carrier frequency and/or bandwidth and/or numerology and/or subcarrier spacing of, or associated to, a symbol. Accordingly, different symbols may have different symbol time lengths. In particular, numerologies with different subcarrier spacings may have different symbol time length. Generally, a symbol time length may be based on, and/or include, a guard time interval or cyclic extension, e.g. prefix or postfix. 
     A sidelink may generally represent a communication channel (or channel structure) between two UEs and/or terminals, in which data is transmitted between the participants (UEs and/or terminals) via the communication channel, e.g. directly and/or without being relayed via a network node. A sidelink may be established only and/or directly via air interface/s of the participant, which may be directly linked via the sidelink communication channel. In some variants, sidelink communication may be performed without interaction by a network node, e.g. on fixedly defined resources and/or on resources negotiated between the participants. Alternatively, or additionally, it may be considered that a network node provides some control functionality, e.g. by configuring resources, in particular one or more resource pool/s, for sidelink communication, and/or monitoring a sidelink, e.g. for charging purposes. 
     Sidelink communication may also be referred to as device-to-device (D2D) communication, and/or in some cases as ProSe (Proximity Services) communication, e.g. in the context of LTE. A sidelink may be implemented in the context of V2x communication (Vehicular communication), e.g. V2V (Vehicle-to-Vehicle), V2I (Vehicle-to-Infrastructure) and/or V2P (Vehicle-to-Person). Any device adapted for sidelink communication may be considered a user equipment or terminal. 
     A sidelink communication channel (or structure) may comprise one or more (e.g., physical or logical) channels, e.g. a PSCCH (Physical Sidelink Control CHannel, which may for example carry control information like an acknowledgement position indication, and/or a PSSCH (Physical Sidelink Shared CHannel, which for example may carry data and/or acknowledgement signaling). It may be considered that a sidelink communication channel (or structure) pertains to and/or used one or more carrier/s and/or frequency range/s associated to, and/or being used by, cellular communication, e.g. according to a specific license and/or standard. Participants may share a (physical) channel and/or resources, in particular in frequency domain and/or related to a frequency resource like a carrier) of a sidelink, such that two or more participants transmit thereon, e.g. simultaneously, and/or time-shifted, and/or there may be associated specific channels and/or resources to specific participants, so that for example only one participant transmits on a specific channel or on a specific resource or specific resources, e.g., in frequency domain and/or related to one or more carriers or subcarriers. 
     A sidelink may comply with, and/or be implemented according to, a specific standard, e.g. an LTE-based standard and/or NR. A sidelink may utilise TDD (Time Division Duplex) and/or FDD (Frequency Division Duplex) technology, e.g. as configured by a network node, and/or preconfigured and/or negotiated between the participants. A user equipment may be considered to be adapted for sidelink communication if it, and/or its radio circuitry and/or processing circuitry, is adapted for utilising a sidelink, e.g. on one or more frequency ranges and/or carriers and/or in one or more formats, in particular according to a specific standard. It may be generally considered that a Radio Access Network is defined by two participants of a sidelink communication. 
     Alternatively, or additionally, a Radio Access Network may be represented, and/or defined with, and/or be related to a network node and/or communication with such a node. 
     Communication or communicating may generally comprise transmitting and/or receiving signaling. Communication on a sidelink (or sidelink signaling) may comprise utilising the sidelink for communication (respectively, for signaling). Sidelink transmission and/or transmitting on a sidelink may be considered to comprise transmission utilising the sidelink, e.g. associated resources and/or transmission formats and/or circuitry and/or the air interface. Sidelink reception and/or receiving on a sidelink may be considered to comprise reception utilising the sidelink, e.g. associated resources and/or transmission formats and/or circuitry and/or the air interface. Sidelink control information (e.g., SCI) may generally be considered to comprise control information transmitted utilising a sidelink. 
     Generally, carrier aggregation (CA) may refer to the concept of a radio connection and/or communication link between a wireless and/or cellular communication network and/or network node and a terminal or on a sidelink comprising a plurality of carriers for at least one direction of transmission (e.g. DL and/or UL), as well as to the aggregate of carriers. A corresponding communication link may be referred to as carrier aggregated communication link or CA communication link; carriers in a carrier aggregate may be referred to as component carriers (CC). In such a link, data may be transmitted over more than one of the carriers and/or all the carriers of the carrier aggregation (the aggregate of carriers). A carrier aggregation may comprise one (or more) dedicated control carriers and/or primary carriers (which may e.g. be referred to as primary component carrier or PCC), over which control information may be transmitted, wherein the control information may refer to the primary carrier and other carriers, which may be referred to as secondary carriers (or secondary component carrier, SCC). However, in some approaches, control information may be sent over more than one carrier of an aggregate, e.g. one or more PCCs and one PCC and one or more SCCs. 
     A transmission may generally pertain to a specific channel and/or specific resources, in particular with a starting symbol and ending symbol in time, covering the interval therebetween. A scheduled transmission may be a transmission scheduled and/or expected and/or for which resources are scheduled or provided or reserved. However, not every scheduled transmission has to be realized. For example, a scheduled downlink transmission may not be received, or a scheduled uplink transmission may not be transmitted due to power limitations, or other influences (e.g., a channel on an unlicensed carrier being occupied). A transmission may be scheduled for a transmission timing substructure (e.g., a mini-slot, and/or covering only a part of a transmission timing structure) within a transmission timing structure like a slot. A border symbol may be indicative of a symbol in the transmission timing structure at which the transmission starts or ends. 
     Predefined in the context of this disclosure may refer to the related information being defined for example in a standard, and/or being available without specific configuration from a network or network node, e.g. stored in memory, for example independent of being configured. Configured or configurable may be considered to pertain to the corresponding information being set/configured, e.g. by the network or a network node. 
     A configuration or schedule, like a mini-slot configuration and/or structure configuration, may schedule transmissions, e.g. for the time/transmissions it is valid, and/or transmissions may be scheduled by separate signaling or separate configuration, e.g. separate RRC signaling and/or downlink control information signaling. The transmission/s scheduled may represent signaling to be transmitted by the device for which it is scheduled, or signaling to be received by the device for which it is scheduled, depending on which side of a communication the device is. It should be noted that downlink control information or specifically DCI signaling may be considered physical layer signaling, in contrast to higher layer signaling like MAC (Medium Access Control) signaling or RRC layer signaling. The higher the layer of signaling is, the less frequent/the more time/resource consuming it may be considered, at least partially due to the information contained in such signaling having to be passed on through several layers, each layer requiring processing and handling. 
     A scheduled transmission, and/or transmission timing structure like a mini-slot or slot, may pertain to a specific channel, in particular a physical uplink shared channel, a physical uplink control channel, or a physical downlink shared channel, e.g. PUSCH, PUCCH or PDSCH, and/or may pertain to a specific cell and/or carrier aggregation. A corresponding configuration, e.g. scheduling configuration or symbol configuration may pertain to such channel, cell and/or carrier aggregation. It may be considered that the scheduled transmission represents transmission on a physical channel, in particular a shared physical channel, for example a physical uplink shared channel or physical downlink shared channel. For such channels, semi-persistent configuring may be particularly suitable. 
     Generally, a configuration may be a configuration indicating timing, and/or be represented or configured with corresponding configuration data. A configuration may be embedded in, and/or comprised in, a message or configuration or corresponding data, which may indicate and/or schedule resources, in particular semi-persistently and/or semi-statically. 
     A control region of a transmission timing structure may be an interval in time and/or frequency domain for intended or scheduled or reserved for control signaling, in particular downlink control signaling, and/or for a specific control channel, e.g. a physical downlink control channel like PDCCH. The interval may comprise, and/or consist of, a number of symbols in time, which may be configured or configurable, e.g. by (UE-specific) dedicated signaling (which may be single-cast, for example addressed to or intended for a specific UE), e.g. on a PDCCH, or RRC signaling, or on a multicast or broadcast channel. In general, the transmission timing structure may comprise a control region covering a configurable number of symbols. It may be considered that in general the border symbol is configured to be after the control region in time. A control region may be associated, e.g. via configuration and/or determination, to one or more specific UEs and/or formats of PDCCH and/or DCI and/or identifiers, e.g. UE identifiers and/or RNTIs or carrier/cell identifiers, and/or be represented and/or associated to a CORESET and/or a search space. 
     The duration of a symbol (symbol time length or interval or allocation unit) of the transmission timing structure may generally be dependent on a numerology and/or carrier, wherein the numerology and/or carrier may be configurable. The numerology may be the numerology to be used for the scheduled transmission. 
     A transmission timing structure may comprise a plurality of allocation units or symbols, and/or define an interval comprising several symbols or allocation units (respectively their associated time intervals). In the context of this disclosure, it should be noted that a reference to a symbol for ease of reference may be interpreted to refer to the time domain projection or time interval or time component or duration or length in time of the symbol, unless it is clear from the context that the frequency domain component also has to be considered. Examples of transmission timing structures include slot, subframe, mini-slot (which also may be considered a substructure of a slot), slot aggregation (which may comprise a plurality of slots and may be considered a superstructure of a slot), respectively their time domain component. A transmission timing structure may generally comprise a plurality of symbols and/or allocation units defining the time domain extension (e.g., interval or length or duration) of the transmission timing structure, and arranged neighboring to each other in a numbered sequence. A timing structure (which may also be considered or implemented as synchronisation structure) may be defined by a succession of such transmission timing structures, which may for example define a timing grid with symbols representing the smallest grid structures. A transmission timing structure, and/or a border symbol or a scheduled transmission may be determined or scheduled in relation to such a timing grid. A transmission timing structure of reception may be the transmission timing structure in which the scheduling control signaling is received, e.g. in relation to the timing grid. A transmission timing structure may in particular be a slot or subframe or in some cases, a mini-slot. In some cases, a timing structure may be represented by a frame structure. Timing structures may be associated to specific transmitters and/or cells and/or beams and/or signalings. 
     Feedback signaling may be considered a form or control signaling, e.g. uplink or sidelink control signaling, like UCI (Uplink Control Information) signaling or SCI (Sidelink Control Information) signaling. Feedback signaling may in particular comprise and/or represent acknowledgement signaling and/or acknowledgement information and/or measurement reporting. 
     Signaling utilising, and/or on and/or associated to, resources or a resource structure may be signaling covering the resources or structure, signaling on the associated frequency/ies and/or in the associated time interval/s. It may be considered that a signaling resource structure comprises and/or encompasses one or more substructures, which may be associated to one or more different channels and/or types of signaling and/or comprise one or more holes (resource element/s not scheduled for transmissions or reception of transmissions). A resource substructure, e.g. a feedback resource structure, may generally be continuous in time and/or frequency, within the associated intervals. It may be considered that a substructure, in particular a feedback resource structure, represents a rectangle filled with one or more resource elements in time/frequency space. However, in some cases, a resource structure or substructure, in particular a frequency resource range, may represent a non-continuous pattern of resources in one or more domains, e.g. time and/or frequency. The resource elements of a substructure may be scheduled for associated signaling. 
     Example types of signaling comprise signaling of a specific communication direction, in particular, uplink signaling, downlink signaling, sidelink signaling, as well as reference signaling (e.g., SRS or CRS or CSI-RS), communication signaling, control signaling, and/or signaling associated to a specific channel like PUSCH, PDSCH, PUCCH, PDCCH, PSCCH, PSSCH, etc.). 
     In some cases, a shifting object like a signaling or signals or sequences or information may be shifted, e.g. relative to a predecessor (e.g., one is subject to a shift, and the shifted version is used), or relative to another (e.g., one associated to one signaling or allocation unit may be shifted to another associated to a second signaling or allocation unit, both may be used). One possible way of shifting is operating a code on it, e.g. to multiply each element of a shifting object with a factor. A ramping (e.g. multiplying with a monotonously increasing or periodic factor) may be considered an example of shifting. Another is a cyclic shift in a domain or interval. A cyclic shift (or circular shift) may correspond to a rearrangement of the elements in the shifting object, corresponding to moving the final element or elements to the first position, while shifting all other entries to the next position, or by performing the inverse operation (such that the shifted object as the result will have the same elements as the shifting object, in a shifted but similar order). Shifting in general may be specific to an interval in a domain, e.g. an allocation unit in time domain, or a bandwidth in frequency domain. For example, it may be considered that signals or modulation symbols in an allocation unit are shifted, such that the order of the modulation symbols or signals is shifted in the allocation unit. In another example, allocation units may be shifted, e.g. in a larger time interval—this may leave signals in the allocation units unshifted with reference to the individual allocation unit, but may change the order of the allocation units. Domains for shifting may for example be time domain and/or phase domain and/or frequency domain. Multiple shifts in the same domain or different domains, and/or the same interval or different intervals (differently sized intervals, for example) may be performed. 
     A transmitting radio node may in some variants be represented by, and/or considered or implemented as, a signaling radio node. A receiving radio node in some variants may be represented by, and/or considered or implemented as, feedback radio node. 
     Synchronisation signaling may be provided by a transmitting (radio) node, e.g. a network node, to allow a receiving (radio) node like a user equipment to identify a cell and/or transmitter, and/or to synchronise to the transmitter and/or cell, and/or to provide information regarding the transmitter and/or cell. Synchronisation signaling may in general comprise one or more components (e.g., different types of signaling), e.g. primary synchronisation signaling (PSS) and/or secondary synchronisation signaling (SSS) and/or broadcast signaling and/or system information (e.g., on a Physical Broadcast Channel). System information (SI) may for example comprise a Master Information Block (MIB) and/or one or more System Information Blocks (SIBs), e.g. at least a SIB1. The different components may be transmitted in a block, e.g. neighboring in time and/or frequency domain. PSS may indicate a transmitter and/or cell identity, e.g. a group of cell and/or transmitter identities the cell belongs to. The SSS may indicate which cell and/or transmitter of the group the cell and/or transmitter the transmitter is associated to and/or represented by (it may be considered that more than one transmitters are associated to the same ID, e.g. in the same cell and/or in a multiple transmission point scenario). PSS may indicate a rougher timing (larger granularity) than the SSS; synchronisation may be based on evaluating PSS and SSS, e.g. in sequence and/or step-wise from a first (rougher) timing to a second (finer) timing. Synchronisation signaling, e.g. PSS and/or SSS, and/or SI may indicate a beam (e.g., beam ID and/or number) and/or beam timing of a beam used for transmitting the synchronisation signaling. Synchronisation signaling may be in form of a SS/PBCH block and/or SSB. It may be considered that synchronisation signaling is transmitted periodically, e.g. every NP ms, e.g. NP=20, 40 or 80. In some cases, synchronisation signaling may be transmitted in bursts, e.g. such that signaling is repeated over more than one synchronisation time interval (e.g., neighboring time intervals, or with gaps between them); a burst may be associated to a burst interval, e.g. within a slot and/or frame and/or a number of NB allocation units, wherein NB may be 100 or less, or 50 or less, or 40 or less or 20 or less. In some cases, a synchronisation time interval may comprise NS allocation units carrying signaling (e.g., PSS and/or SSS and/or PBCH or SI); it may be considered that a burst interval comprises P1 (P1&gt;=1) occasions (thus, P1-1 repetitions) of the synchronisation signaling, and/or comprises at least P1×NS allocation units in time domain; it may be larger than P1×NS units, e.g. to allow for gaps between individual occasions and/or one or more guard interval/s. In some variants, it may comprise at least (P1+1)×NS allocation units, or (P1+2)×NS allocation units, e.g. including gaps between occasions. The synchronisation signaling may be transmitted on, and/or be associated to, a synchronisation bandwidth in frequency space, which may be predefined and/or configured or configurable (e.g., for a receiving node). The synchronisation bandwidth may for example be 100 MHz and/or 500 MHz, or 250 MHz, or another value. A synchronisation bandwidth may be associated to and/or be arranged within a carrier and/or a communication frequency interval. It may be considered that for each carrier and/or frequency interval, there are one or more possible location of a synchronisation bandwidth. PSS and/or SSS may be considered physical layer signaling representing information without having coding (e.g., error coding). Broadcast signaling, e.g. on a PBCH may be coded, in particular comprises error coding like error correction coding, e.g. a CRC. 
     In the context of this disclosure, there may be distinguished between dynamically scheduled or aperiodic transmission and/or configuration, and semi-static or semi-persistent or periodic transmission and/or configuration. The term “dynamic” or similar terms may generally pertain to configuration/transmission valid and/or scheduled and/or configured for (relatively) short timescales and/or a (e.g., predefined and/or configured and/or limited and/or definite) number of occurrences and/or transmission timing structures, e.g. one or more transmission timing structures like slots or slot aggregations, and/or for one or more (e.g., specific number) of transmission/occurrences. Dynamic configuration may be based on low-level signaling, e.g. control signaling on the physical layer and/or MAC layer, in particular in the form of DCI or SCI. Periodic/semi-static may pertain to longer timescales, e.g. several slots and/or more than one frame, and/or a non-defined number of occurrences, e.g., until a dynamic configuration contradicts, or until a new periodic configuration arrives. A periodic or semi-static configuration may be based on, and/or be configured with, higher-layer signaling, in particular RCL layer signaling and/or RRC signaling and/or MAC signaling. 
     In this disclosure, for purposes of explanation and not limitation, specific details are set forth (such as particular network functions, processes and signaling steps) in order to provide a thorough understanding of the technique presented herein. It will be apparent to one skilled in the art that the present concepts and aspects may be practiced in other variants and variants that depart from these specific details. 
     For example, the concepts and variants are partially described in the context of Long Term Evolution (LTE) or LTE-Advanced (LTE-A) or New Radio mobile or wireless communications technologies; however, this does not rule out the use of the present concepts and aspects in connection with additional or alternative mobile communication technologies such as the Global System for Mobile Communications (GSM) or IEEE standards as IEEE 802.11ad or IEEE 802.11 ay. While described variants may pertain to certain Technical Specifications (TSs) of the Third Generation Partnership Project (3GPP), it will be appreciated that the present approaches, concepts and aspects could also be realized in connection with different Performance Management (PM) specifications. 
     Moreover, those skilled in the art will appreciate that the services, functions and steps explained herein may be implemented using software functioning in conjunction with a programmed microprocessor, or using an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA) or general purpose computer. It will also be appreciated that while the variants described herein are elucidated in the context of methods and devices, the concepts and aspects presented herein may also be embodied in a program product as well as in a system comprising control circuitry, e.g. a computer processor and a memory coupled to the processor, wherein the memory is encoded with one or more programs or program products that execute the services, functions and steps disclosed herein. 
     It is believed that the advantages of the aspects and variants presented herein will be fully understood from the foregoing description, and it will be apparent that various changes may be made in the form, constructions and arrangement of the exemplary aspects thereof without departing from the scope of the concepts and aspects described herein or without sacrificing all of its advantageous effects. The aspects presented herein can be varied in many ways. 
     Some useful abbreviations comprise 
     
       
         
           
               
               
             
               
                   
               
               
                 Abbreviation 
                 Explanation 
               
               
                   
               
             
            
               
                 ACK/NACK 
                 Acknowledgment/Negative Acknowledgement 
               
               
                 ARQ 
                 Automatic Repeat reQuest 
               
               
                 BER 
                 Bit Error Rate 
               
               
                 BLER 
                 Block Error Rate 
               
               
                 BPSK 
                 Binary Phase Shift Keying 
               
               
                 BWP 
                 Bandwidth Part 
               
               
                 CAZAC 
                 Constant Amplitude Zero Cross Correlation 
               
               
                 CB 
                 Code Block 
               
               
                 CBB 
                 Code Block Bundle 
               
               
                 CBG 
                 Code Block Group 
               
               
                 CBGFI 
                 CBG Flush Indication (indicating whether 
               
               
                   
                 to perform Soft Combining) 
               
               
                 CBGTI 
                 CBG Transmission Information 
               
               
                 CDM 
                 Code Division Multiplex 
               
               
                 CM 
                 Cubic Metric 
               
               
                 CORESET 
                 Control Resource Set 
               
               
                 CQI 
                 Channel Quality Information 
               
               
                 CRC 
                 Cyclic Redundancy Check 
               
               
                 CRS 
                 Common reference signal 
               
               
                 CSI 
                 Channel State Information 
               
               
                 CSI-RS 
                 Channel state information reference signal 
               
               
                 DAI 
                 Downlink Assignment Indicator 
               
               
                 DCI 
                 Downlink Control Information 
               
               
                 DFT 
                 Discrete Fourier Transform 
               
               
                 DFTS-FDM 
                 DFT-spread-FDM 
               
               
                 DM(-)RS 
                 Demodulation reference signal(ing) 
               
               
                 eMBB 
                 enhanced Mobile BroadBand 
               
               
                 FDD 
                 Frequency Division Duplex 
               
               
                 FDE 
                 Frequency Domain Equalisation 
               
               
                 FDF 
                 Frequency Domain Filtering 
               
               
                 FDM 
                 Frequency Division Multiplex 
               
               
                 HARQ 
                 Hybrid Automatic Repeat Request 
               
               
                 IAB 
                 Integrated Access and Backhaul 
               
               
                 IFFT 
                 Inverse Fast Fourier Transform 
               
               
                 IR 
                 Impulse Response 
               
               
                 ISI 
                 Inter Symbol Interference 
               
               
                 MBB 
                 Mobile Broadband 
               
               
                 MCS 
                 Modulation and Coding Scheme 
               
               
                 MIMO 
                 Multiple-input-multiple-output 
               
               
                 MRC 
                 Maximum-ratio combining 
               
               
                 MRT 
                 Maximum-ratio transmission 
               
               
                 MU-MIMO 
                 Multiuser multiple-input-multiple-output 
               
               
                 OFDM/A 
                 Orthogonal Frequency Division Multiplex/Multiple Access 
               
               
                 PAPR 
                 Peak to Average Power Ratio 
               
               
                 PDCCH 
                 Physical Downlink Control Channel 
               
               
                 PDSCH 
                 Physical Downlink Shared Channel 
               
               
                 PRACH 
                 Physical Random Access CHannel 
               
               
                 PRB 
                 Physical Resource Block 
               
               
                 PUCCH 
                 Physical Uplink Control Channel 
               
               
                 PUSCH 
                 Physical Uplink Shared Channel 
               
               
                 (P)SCCH 
                 (Physical) Sidelink Control Channel 
               
               
                 PSS 
                 Primary Synchronisation Signal(ing) 
               
               
                 PT-RS 
                 Phase Tracking Reference Signaling 
               
               
                 (P)SSCH 
                 (Physical) Sidelink Shared Channel 
               
               
                 QAM 
                 Quadrature Amplitude Modulation 
               
               
                 OCC 
                 Orthogonal Cover Code 
               
               
                 QPSK 
                 Quadrature Phase Shift Keying 
               
               
                 PSD 
                 Power Spectral Density 
               
               
                 RAN 
                 Radio Access Network 
               
               
                 RAT 
                 Radio Access Technology 
               
               
                 RB 
                 Resource Block 
               
               
                 RNTI 
                 Radio Network Temporary Identifier 
               
               
                 RRC 
                 Radio Resource Control 
               
               
                 RX 
                 Receiver, Reception, Reception-related/side 
               
               
                 SA 
                 Scheduling Assignment 
               
               
                 SC-FDE 
                 Single Carrier Frequency Domain Equalisation 
               
               
                 SC-FDM/A 
                 Single Carrier Frequency Division Multiplex/Multiple 
               
               
                   
                 Access 
               
               
                 SCI 
                 Sidelink Control Information 
               
               
                 SINR 
                 Signal-to-interference-plus-noise ratio 
               
               
                 SIR 
                 Signal-to-interference ratio 
               
               
                 SNR 
                 Signal-to-noise-ratio 
               
               
                 SR 
                 Scheduling Request 
               
               
                 SRS 
                 Sounding Reference Signal(ing) 
               
               
                 SSS 
                 Secondary Synchronisation Signal(ing) 
               
               
                 SVD 
                 Singular-value decomposition 
               
               
                 TB 
                 Transport Block 
               
               
                 TDD 
                 Time Division Duplex 
               
               
                 TDM 
                 Time Division Multiplex 
               
               
                 T-RS 
                 Tracking Reference Signaling or Timing Reference 
               
               
                   
                 Signaling 
               
               
                 TX 
                 Transmitter, Transmission, Transmission-related/side 
               
               
                 UCI 
                 Uplink Control Information 
               
               
                 UE 
                 User Equipment 
               
               
                 URLLC 
                 Ultra Low Latency High Reliability Communication 
               
               
                 VL-MIMO 
                 Very-large multiple-input-multiple-output 
               
               
                 ZF 
                 Zero Forcing 
               
               
                 ZP 
                 Zero-Power, e.g. muted CSI-RS symbol 
               
               
                   
               
            
           
         
       
     
     Abbreviations may be considered to follow 3G PP usage if applicable.