Patent Description:
Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic.

Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into <NUM> types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PCS interface and/or Uu interface.

Regarding V2X communication, a scheme of providing a safety service, based on a V2X message such as Basic Safety Message (BSM), Cooperative Awareness Message (CAM), and Decentralized Environmental Notification Message (DENM) is focused in the discussion on the RAT used before the NR. The V2X message may include position information, dynamic information, attribute information, or the like. For example, a UE may transmit a periodic message type CAM and/or an event triggered message type DENM to another UE.

For example, the CAM may include dynamic state information of the vehicle such as direction and speed, static data of the vehicle such as a size, and basic vehicle information such as an exterior illumination state, route details, or the like. For example, the UE may broadcast the CAM, and latency of the CAM may be less than <NUM>. For example, the UE may generate the DENM and transmit it to another UE in an unexpected situation such as a vehicle breakdown, accident, or the like. For example, all vehicles within a transmission range of the UE may receive the CAM and/or the DENM. In this case, the DENM may have a higher priority than the CAM.

Thereafter, regarding V2X communication, various V2X scenarios are proposed in NR. For example, the various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, or the like.

For example, based on the vehicle platooning, vehicles may move together by dynamically forming a group. For example, in order to perform platoon operations based on the vehicle platooning, the vehicles belonging to the group may receive periodic data from a leading vehicle. For example, the vehicles belonging to the group may decrease or increase an interval between the vehicles by using the periodic data.

For example, based on the advanced driving, the vehicle may be semi-automated or fully automated. For example, each vehicle may adjust trajectories or maneuvers, based on data obtained from a local sensor of a proximity vehicle and/or a proximity logical entity. In addition, for example, each vehicle may share driving intention with proximity vehicles.

For example, based on the extended sensors, raw data, processed data, or live video data obtained through the local sensors may be exchanged between a vehicle, a logical entity, a UE of pedestrians, and/or a V2X application server. Therefore, for example, the vehicle may recognize a more improved environment than an environment in which a self-sensor is used for detection.

For example, based on the remote driving, for a person who cannot drive or a remote vehicle in a dangerous environment, a remote driver or a V2X application may operate or control the remote vehicle. For example, if a route is predictable such as public transportation, cloud computing based driving may be used for the operation or control of the remote vehicle. In addition, for example, an access for a cloud-based back-end service platform may be considered for the remote driving.

Meanwhile, a scheme of specifying service requirements for various V2X scenarios such as vehicle platooning, advanced driving, extended sensors, remote driving, or the like is discussed in NR-based V2X communication.

Prior art can be found in <CIT> which generally relates to methods and apparatus for transmission scheduling in a wireless communication system.

According to an embodiment, a method of operating a first apparatus <NUM> in a wireless communication system is proposed. The method may include: determining priority related to a sidelink, SL, transmission; receiving information related to an SL threshold related to an uplink, UL, transmission from a base station <NUM>; and performing one of the SL transmission or the UL transmission, based on the priority related to the SL transmission and the SL threshold.

The user equipment (UE) may efficiently perform SL communication.

In the present specification, "A or B" may mean "only A", "only B" or "both A and B. " In other words, in the present specification, "A or B" may be interpreted as "A and/or B". For example, in the present specification, "A, B, or C" may mean "only A", "only B", "only C", or "any combination of A, B, C".

A slash (/) or comma used in the present specification may mean "and/or". For example, "A, B, C" may mean "A, B, or C".

In the present specification, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, in the present specification, the expression "at least one of A or B" or "at least one of A and/or B" may be interpreted as "at least one of A and B".

In addition, in the present specification, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". In addition, "at least one of A, B, or C" or "at least one of A, B, and/or C" may mean "at least one of A, B, and C".

In addition, a parenthesis used in the present specification may mean "for example". Specifically, when indicated as "control information (PDCCH)", it may mean that "PDCCH" is proposed as an example of the "control information". In other words, the "control information" of the present specification is not limited to "PDCCH", and "PDDCH" may be proposed as an example of the "control information". In addition, when indicated as "control information (i.e., PDCCH)", it may also mean that "PDCCH" is proposed as an example of the "control information".

A technical feature described individually in one figure in the present specification may be individually implemented, or may be simultaneously implemented.

<FIG> shows a structure of an NR system, in accordance with an embodiment of the present disclosure.

<FIG> shows a functional division between an NG-RAN and a 5GC, in accordance with an embodiment of the present disclosure.

Referring to <FIG>, the gNB may provide functions, such as Inter Cell Radio Resource Management (RRM), Radio Bearer (RB) control, Connection Mobility Control, Radio Admission Control, Measurement Configuration & Provision, Dynamic Resource Allocation, and so on. An AMF may provide functions, such as Non Access Stratum (NAS) security, idle state mobility processing, and so on. AUPF may provide functions, such as Mobility Anchoring, Protocol Data Unit (PDU) processing, and so on. A Session Management Function (SMF) may provide functions, such as user equipment (UE) Internet Protocol (IP) address allocation, PDU session control, and so on.

Layers of a radio interface protocol between the UE and the network can be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system. Among them, a physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel, and a radio resource control (RRC) layer belonging to the third layer serves to control a radio resource between the UE and the network. For this, the RRC layer exchanges an RRC message between the UE and the BS.

<FIG> shows a radio protocol architecture, in accordance with an embodiment of the present disclosure. Specifically, <FIG> shows a radio protocol architecture for a user plane, and <FIG> shows a radio protocol architecture for a control plane. The user plane corresponds to a protocol stack for user data transmission, and the control plane corresponds to a protocol stack for control signal transmission.

A radio resource control (RRC) layer is defined only in the control plane. The RRC layer serves to control the logical channel, the transport channel, and the physical channel in association with configuration, reconfiguration and release of RBs. The RB is a logical path provided by the first layer (i.e., the physical layer or the PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, and the packet data convergence protocol (PDCP) layer) for data delivery between the UE and the network.

The physical channel includes several OFDM symbols in a time domain and several sub-carriers in a frequency domain. One sub-frame includes a plurality of OFDM symbols in the time domain. A resource block is a unit of resource allocation, and consists of a plurality of OFDM symbols and a plurality of sub-carriers. Further, each subframe may use specific sub-carriers of specific OFDM symbols (e.g., a first OFDM symbol) of a corresponding subframe for a physical downlink control channel (PDCCH), i.e., an L1/L2 control channel. A transmission time interval (TTI) is a unit time of subframe transmission.

A sub frame (SF) may be divided into one or more slots, and the number of slots within a subframe may be determined in accordance with subcarrier spacing (SCS).

Table <NUM> shown below represents an example of a number of symbols per slot (Nslotsymb), a number slots per frame (Nframe,uslot), and a number of slots per subframe (Nsubframe,uslot) in accordance with an SCS configuration (u), in a case where a normal CP is used.

Table <NUM> shows an example of a number of symbols per slot, a number of slots per frame, and a number of slots per subframe in accordance with the SCS, in a case where an extended CP is used.

<FIG> shows a structure of a slot of an NR frame, in accordance with an embodiment of the present disclosure.

Meanwhile, a radio interface between a UE and another UE or a radio interface between the UE and a network may consist of an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may imply a physical layer. In addition, for example, the L2 layer may imply at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. In addition, for example, the L3 layer may imply an RRC layer.

The BWP may be a set of consecutive physical resource blocks (PRBs) in a given numerology. The PRB may be selected from consecutive sub-sets of common resource blocks (CRBs) for the given numerology on a given carrier.

When using bandwidth adaptation (BA), a reception bandwidth and transmission bandwidth of a UE are not necessarily as large as a bandwidth of a cell, and the reception bandwidth and transmission bandwidth of the BS may be adjusted. For example, a network/BS may inform the UE of bandwidth adjustment. For example, the UE receive information/configuration for bandwidth adjustment from the network/BS. In this case, the UE may perform bandwidth adjustment based on the received information/configuration. For example, the bandwidth adjustment may include an increase/decrease of the bandwidth, a position change of the bandwidth, or a change in subcarrier spacing of the bandwidth.

For example, the bandwidth may be decreased during a period in which activity is low to save power. For example, the position of the bandwidth may move in a frequency domain. For example, the position of the bandwidth may move in the frequency domain to increase scheduling flexibility. For example, the subcarrier spacing of the bandwidth may be changed. For example, the subcarrier spacing of the bandwidth may be changed to allow a different service. A subset of a total cell bandwidth of a cell may be called a bandwidth part (BWP). The BA may be performed when the BS/network configures the BWP to the UE and the BS/network informs the UE of the BWP currently in an active state among the configured BWPs.

For example, the UE may not receive PDCCH, PDSCH, or CSI-RS (excluding RRM) outside the active DL BWP. For example, the UE may not transmit PUCCH or PUSCH outside an active UL BWP. For example, in a downlink case, the initial BWP may be given as a consecutive RB set for an RMSI CORESET (configured by PBCH). For example, in an uplink case, the initial BWP may be given by SIB for a random access procedure. For energy saving, if the UE fails to detect DCI during a specific period, the UE may switch the active BWP of the UE to the default BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used in transmission and reception. For example, a transmitting UE may transmit an SL channel or an SL signal on a specific BWP, and a receiving UE may receive the SL channel or the SL signal on the specific BWP. In a licensed carrier, the SL BWP may be defined separately from a Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for the SL BWP from the BS/network. The SL BWP may be (pre-)configured in a carrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UE in the RRC_CONNECTED mode, at least one SL BWP may be activated in the carrier.

<FIG> shows an example of a BWP, in accordance with an embodiment of the present disclosure.

<FIG> shows a radio protocol architecture for a SL communication, in accordance with an embodiment of the present disclosure. More specifically, <FIG> shows a user plane protocol stack, and <FIG> shows a control plane protocol stack.

Hereinafter, a sidelink synchronization signal (SLSS) and synchronization information will be described.

The SLSS may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS), as an SL-specific sequence. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, length-<NUM>-sequences may be used for the S-PSS, and length-<NUM> gold sequences may be used for the S-SSS. For example, a UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information which must be first known by the UE before SL signal transmission/reception. For example, the default information may be information related to SLSS, a duplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL) configuration, information related to a resource pool, a type of an application related to the SLSS, a subframe offset, broadcast information, or the like. For example, for evaluation of PSBCH performance, in NR V2X, a payload size of the PSBCH may be <NUM> bits including <NUM>-bit CRC.

<FIG> shows a UE performing V2X or SL communication, in accordance with an embodiment of the present disclosure.

Referring to <FIG>, in V2X or SL communication, the term 'UE' may generally imply a UE of a user. However, if a network equipment such as a BS transmits/receives a signal according to a communication scheme between UEs, the BS may also be regarded as a sort of the UE. For example, a UE <NUM> may be a first apparatus <NUM>, and a UE <NUM> may be a second apparatus <NUM>.

<FIG> shows a procedure of performing V2X or SL communication by a UE based on a transmission mode, in accordance with an embodiment of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be called a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode may be called an LTE transmission mode. In NR, the transmission mode may be called an NR resource allocation mode.

For example, <FIG> shows a UE operation related to an LTE transmission mode <NUM> or an LTE transmission mode <NUM>. Alternatively, for example, <FIG> shows a UE operation related to an NR resource allocation mode <NUM>. For example, the LTE transmission mode <NUM> may be applied to general SL communication, and the LTE transmission mode <NUM> may be applied to V2X communication.

For example, <FIG> shows a UE operation related to an LTE transmission mode <NUM> or an LTE transmission mode <NUM>. Alternatively, for example, <FIG> shows a UE operation related to an NR resource allocation mode <NUM>.

Referring to <FIG>, in the LTE transmission mode <NUM>, the LTE transmission mode <NUM>, or the NR resource allocation mode <NUM>, a BS may schedule an SL resource to be used by the UE for SL transmission. For example, the BS may perform resource scheduling to a UE <NUM> through a PDCCH (more specifically, downlink control information (DCI)), and the UE 1may perform V2X or SL communication with respect to a UE <NUM> according to the resource scheduling. For example, the UE <NUM> may transmit a sidelink control information (SCI) to the UE <NUM> through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to the UE <NUM> through a physical sidelink shared channel (PSSCH).

Referring to <FIG>, in the LTE transmission mode <NUM>, the LTE transmission mode <NUM>, or the NR resource allocation mode <NUM>, the UE may determine an SL transmission resource within an SL resource configured by a BS/network or a pre-configured SL resource. For example, the configured SL resource or the pre-configured SL resource may be a resource pool. For example, the UE may autonomously select or schedule a resource for SL transmission. For example, the UE may perform SL communication by autonomously selecting a resource within a configured resource pool. For example, the UE may autonomously select a resource within a selective window by performing a sensing and resource (re)selection procedure. For example, the sensing may be performed in unit of subchannels. In addition, the UE <NUM> which has autonomously selected the resource within the resource pool may transmit the SCI to the UE <NUM> through a PSCCH, and thereafter may transmit data based on the SCI to the UE <NUM> through a PSSCH.

<FIG> shows three cast types, in accordance with an embodiment of the present disclosure. Specifically, <FIG> shows broadcast-type SL communication, <FIG> shows unicast type-SL communication, and <FIG> shows groupcast-type SL communication. In case of the unicast-type SL communication, a UE may perform one-to-one communication with respect to another UE. In case of the groupcast-type SL transmission, the UE may perform SL communication with respect to one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced with SL multicast communication, SL one-to-many communication, or the like.

Meanwhile, in a next generation system, various usage cases may be supported. For example, services for communication of self-driving vehicles, smart cars or connected cars, and so on, may be considered. For such services, each vehicle may receive and send (or transmit) information as a user equipment capable of performing communication. And, depending upon the circumstances, each vehicle may select resources for communication with the help (or assistance) of the base station or without any help (or assistance) of the base station and transmit and receive messages to and from other UEs.

On the other hand, as one of the issues in NR sidelink (SL), there is an issue related to a prioritization between uplink (UL) transmission and SL transmission on the Uu interface. The prioritization scheme may be applied between SL transmission and UL transmission in intra-RAT or between SL transmission and UL transmission in inter-RAT. For example, prioritization in inter-RAT may be applied between LTE UL transmission and NR SL transmission, or between LTE SL transmission and NR UL transmission.

For example, in LTE V2X, the following three cases have been discussed as cases to which the prioritization scheme should be applied. That is, from the perspective of one UE, when simultaneous transmission of UL transmission and SL transmission is performed on the same or shared carrier, or when simultaneous transmission of LTL transmission and SL transmission is performed on different carriers, a situation occurs in which simultaneous transmission of the UL transmission and the SL transmission cannot be performed when the UL transmission and the SL transmission overlap on the time axis, according to the first case (case <NUM>) to the third case (case <NUM>) of Table <NUM> below. For example, in the case of the first case, if the two transmissions overlap on the time axis, the UE may not be able to perform either UL transmission or SL transmission although the UL transmission and the SL transmission each have different TX chains and power budgets. Likewise, in the case of the second case, even if UL transmission and SL transmission have different TX chains and share power, if the two transmissions overlap on the time axis, the UE may not be able to perform either the UL transmission or the SL transmission. In case <NUM>, when UL transmission and SL transmission share both the TX chain and power, there may be an issue related to determining which one of the two transmissions to drop or how to perform power allocation of the two transmissions in cases that the two transmissions overlap in the time axis.

Table <NUM> shows an example in which UL transmission and SL transmission are simultaneously performed.

With respect to the issue raised in LTE V2X, LTE V2X MAC procedure was specified as shown in Table <NUM> below in terms of procedure. Details included in Table <NUM> may be referred to in 3GPP TS <NUM>.

Briefly describing the operation in Table <NUM>, when the above three conditions are satisfied, V2X SL transmission is prioritized over UL transmission. The above three conditions may include a condition that a MAC layer cannot transmit all UL transmissions and all SL transmissions at the same time, and a condition that UL transmission is not prioritized by higher layer designation, and a condition that a value related to the highest priority of an SL logical channel (LCH) is smaller than a pre-configured SL threshold. For example, the SL threshold may include thresSL-TxPrioritization. For example, when comparing two values related to priority, a numerically small value of one side may mean that the actual priority of the item related to the numerically small value is relatively higher than the priority of the item related to the other value. For example, a case that all UL transmissions and all SL transmissions cannot be transmitted simultaneously at the same timing may include the first to third cases in Table <NUM> above. Alternatively, a case that all UL transmissions and all SL transmissions cannot be transmitted simultaneously at the same timing may be included in a scenario related to Table <NUM>. For example, referring to document TS <NUM> of 3GPP, the thresSL-TxPrioritization may represent a threshold value used to determine whether the V2X SL transmission has priority over the UL transmission when V2X SL transmission and UL transmission overlap on the time axis. In addition, referring to document TS <NUM> of 3GPP, thresSL-TxPrioritization may be overwritten with thresSL-TxPrioritization configured in the V2X SL pre-configuration.

On the other hand, even in NR V2X, it is necessary to regulate the prioritization of UL transmission and SL transmission according to the collision that occurs as described above. For example, a collision may include a case where two transmissions overlap in the time axis. In the present disclosure, a method for prioritization according to collision between UL transmission and SL transmission on intra-RAT or inter-RAT related to NR sidelink is proposed. First, a scenario to which the prioritization method proposed below can be applied will be exemplified.

Hereinafter, in the above scenario, it is proposed whether a UE prioritizes or drops SL transmission over UL transmission based on a pre-configured threshold. Here, the UL transmission may be performed based on a PUCCH resource or a PUSCH resource pre-configured to the UE. For example, the UL transmission may include a PUCCH or a PUSCH transmitted through a PUCCH resource or a PUSCH resource pre-configured to the UE.

According to an embodiment of the present disclosure, in NR, since information related to priority is not always linked to PUCCH resources, when UL transmission is PUCCH transmission, like the principle of LTE in UL/SL prioritization, when a value related to the highest priority of SL LCH related to SL transmission is smaller than a pre-configured SL threshold, a scheme of prioritizing SL transmission over UL transmission may be applied. For example, the SL threshold may include thresSL-TxPrioritization. For example, a cases that the value related to the highest priority of the SL LCH related to the SL transmission is smaller than the pre-configured SL threshold may include a case that the priority of the SL LCH related to SL transmission is higher than the priority related to the threshold, or a case that the priority of the SL LCH is higher than the priority corresponding to the pre-configured SL threshold. Here, what is proposed here is that an SL threshold value for comparing the priority with SL transmission may be different depending on what kind of content UL transmission having a collision includes.

For example, PUCCH may be used to transmit information related to at least one of a scheduling request (SR), HARQ ACK/NACK related to PDSCH transmission, and/or channel status information (CSI). In general, HARQ ACK/NACK and SR may have a relatively higher priority than CSI, because the HARQ ACK/NACK and the SR are information related to success or failure of the initial transmission, or resource scheduling requests for urgently needed data, whereas CSI is used for the purpose of adapting the state of a link by reporting the channel state. Accordingly, a base station may configure the SL threshold differently according to the content to be transmitted through the PUCCH in advance. For example, the SL threshold may include a thresSL-TxPrioritization value.

For example, a first SL threshold (for example, thresSL-TxPrioritization1), to be applied to prioritization between PUCCH related to HARQ ACK/NACK and/or SR and SL transmission, may be configured relatively smaller than a second SL threshold (for example, thresSL-Txprioritization2), to be applied to prioritization between PUCCH related to CSI transmission and SL transmission.

For example, when PSFCH transmission and UL transmission collide, in terms of priority between the PSFCH transmission and the UL transmission, the priority of the PSFCH transmission may be the same as the highest priority among PSCCH/PSSCH related to the PSFCH. For example, when the UL transmission is not related to the SL HARQ report, if the UL transmission is configured to high priority from a higher layer, or if the UL transmission is UL transmission related to DCI indicating 'high' in a priority field, where the last two options correspond to the claimed embodiment, and an SL threshold related to URLLC is configured, the UE may perform either the UL transmission or the PSFCH transmission based on the SL threshold and the priority of SL transmission. Here, if an SL threshold related to URLLC is not configured, the UE may prioritize the UL transmission over the PSFCH transmission. For example, if the priority value related to the SL transmission is smaller than the SL threshold, the UE may prioritize the SL transmission over the UL transmission, if the priority value is greater than the SL threshold, the UE may prioritize the UL transmission over the SL transmission. For example, when UL transmission is not related to an SL HARQ report, if the UL transmission is configured to high priority from a higher layer or the UL transmission is not UL transmission related to DCI indicating 'high' in a priority field, the UE may perform prioritization based on an SL threshold that is not related to URLLC. Additionally, for example, a UE may always prioritize PRACH and PUSCH scheduled by the RAR UL grant.

<FIG> shows a procedure for determining whether to perform SL transmission, according to an embodiment of the present disclosure.

Referring to <FIG>, an SL priority value may be <NUM>. For example, the SL priority value may represent a value related to a priority included in an LCH related to SL transmission. For example, a first SL threshold (e.g., thresSL-TxPrioritization1) and a second SL threshold (e.g., thresSL-TxPrioritization2) may be <NUM> and <NUM>, respectively. Here, the UE may perform prioritization related to the SL transmission and the UL transmission based on two differently configured SL thresholds. For example, if a collision between PUCCH transmission and SL transmission related to HARQ ACK/NACK and/or SR occurs, the UE may compare the first SL threshold value with an SL priority value, and give priority to UL PUCCH transmission because the SL transmission has a lower priority. At this time, for example, the UE may drop the SL transmission. Conversely, if, for example, a collision between PUCCH and SL transmission of low priority related to CSI occurs, since the SL priority value is smaller than the second SL threshold, the UE may drop the UL PUCCH transmission.

In the above, it was assumed that priority of PUCCH related to HARQ ACK/NACK and SR is higher than that of PUCCH related to CSI, the priority relationship between these PUCCHs may be defined in advance and reflected in an SL threshold signaled by a base station. For example, the SL threshold may include thresSL-TxPrioritization. For example, a base station may configure an SL threshold related to URLLC transmission to be smaller in order to perform urgent URLLC transmission and to protect HARQ ACK/NACK related therewith. For example, this threshold configuration may be signaled periodically and changed.

According to an embodiment of the present disclosure, when an LCH priority value related to PUCCH exists, a UE may determine whether to drop SL transmission by comparing the priorities between UL transmission and the SL transmission. For example, in the case of an SR of an NR, priority of the SR may be that of an LCH related to the SR. For example, in cast of the SR, by directly comparing priority of the LCH related to the PUCCH and priority of SL LCH, transmission related to the LCH having a higher priority may be prioritized. That is, for example, transmission related to an LCH having a lower priority as a result of comparison may be dropped.

According to an embodiment of the present disclosure, a UE may determine which transmission is to be prioritized in a UL/SL collision scenario, thereby preventing a phenomenon in which transmission of all data fails in the collision scenario.

<FIG> shows a procedure for a UE to determine whether to transmit an SL signal, according to an embodiment of the present disclosure.

Referring to <FIG>, for example, a UE may include at least one of VRU, V2X, and/or RSU. <FIG> is a flowchart for explaining a method for a UE to determine whether to drop transmission of a UL signal and transmit an SL signal with priority, in case that the SL signal to be transmitted from the UE and the UL signal to be transmitted from the UE overlap in the time domain.

Referring to <FIG>, when transmission of a UL signal and transmission of an SL signal overlap each other in time domain, in step S <NUM>, a UE may compare a pre-configured threshold value with a priority related to the SL signal. Here, priority related to the SL signal may be the highest priority among LCH priorities configured for the SL signal or LCH priorities configured for the SL signal. Also, here, the pre-configured threshold value may be configured differently based on content related to the UL signal. For example, a threshold value configured when the UL signal is a signal related to HARQ ACK/NACK and SR may be configured to a value smaller than a threshold value configured when the UL signal is a signal related to CSI.

In step S <NUM>, the UE may determine whether to transmit the SL signal with priority over the UL signal, based on the comparison result between the pre-configured threshold value corresponding to the content related to the UL signal and the priority related to the SL signal. Specifically, when the priority value related to the SL signal has a value smaller than the pre-configured threshold value (that is, when the priority of the SL signal takes precedence over the priority corresponding to the pre-configured threshold value), the UE may drop the UL signal and transmit the SL signal with priority. On the other hand, when the priority value related to the SL signal has a value greater than the pre-configured threshold value (that is, when the priority corresponding to the pre-configured threshold value has priority over the priority of the SL signal), the UE may drop the SL signal and transmit the UL signal.

<FIG> shows a procedure for a first apparatus to perform any one of UL transmission, according to an embodiment of the present disclosure.

Referring to <FIG>, in step S <NUM><NUM>, a first apparatus determines priority related to a sidelink, SL, transmission. In step S1420, the first apparatus may receive information related to an SL threshold related to an uplink, UL, transmission from a base station. In step S1430, the first apparatus performs one of the SL transmission or the UL transmission, based on the priority related to the SL transmission and the SL threshold. For example, the SL transmission and the UL transmission may overlap in time domain, and the SL threshold may be configured to the first apparatus based on priority related to the UL transmission.

For example, the priority related to the SL transmission may be determined based on a first logical channel, LCH, related to the SL transmission.

For example, a transmission which is not performed among the SL transmission or the UL transmission may be dropped.

For example, based on the priority related to the SL transmission which has a greater value than the SL threshold, the UL transmission may be performed among the SL transmission or the UL transmission.

For example, the priority related to the UL transmission may include priority related to a packet which is transmitted through the UL transmission.

For example, the packet which is transmitted through the UL transmission may include information related to at least one of physical uplink control channel, PUCCH, a scheduling request, SR, a hybrid automatic repeat request, HARQ, feedback, and/or channel state information, CSI.

For example, priority related to the packet which is transmitted through the UL transmission may be configured by a base station.

For example, the priority related to the packet which is transmitted through the UL transmission may be 'high'.

For example, the priority related to the packet which is transmitted through the UL transmission may be changed periodically.

For example, the priority related to the UL transmission may be received from a base station.

For example, the priority related to the UL transmission may be received through downlink control information, DCI, from the base station.

For example, the priority related to the UL transmission may be received through a radio resource control, RRC, message from the base station.

For example, the priority related to the SL transmission may be included in a first LCH related to the SL transmission, the priority related to the UL transmission may be included in a second LCH related to the UL transmission, and the transmission which is performed may be performed as one among the SL transmission and the UL transmission based on the priority related to the SL transmission and the priority related to the UL transmission.

The above-described embodiment may be applied to various devices to be described below. For example, a processor <NUM> of a first apparatus <NUM> may determine priority related to a sidelink, SL, transmission. And, the processor <NUM> of the first apparatus <NUM> may control a transceiver <NUM> to receive information related to an SL threshold related to an uplink, UL, transmission from a base station <NUM>. And, the processor <NUM> of the first apparatus <NUM> may control the transceiver <NUM> to perform one of the SL transmission or the UL transmission, based on the priority related to the SL transmission and the SL threshold. For example, the SL transmission and the UL transmission may overlap in time domain, and the SL threshold may be configured to the first apparatus based on priority related to the UL transmission.

According to an embodiment of the present disclosure, a first apparatus for performing wireless communication may be supported. For example, the first apparatus may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: determine priority related to a sidelink, SL, transmission; receive information related to an SL threshold related to an uplink, UL, transmission from a base station; and perform one of the SL transmission or the UL transmission, based on the priority related to the SL transmission and the SL threshold, wherein the SL transmission and the UL transmission overlap in time domain, and wherein the SL threshold is configured to the first apparatus based on priority related to the UL transmission.

According to an embodiment of the present disclosure, an apparatus configured to control a first user equipment, UE, may be proposed. For example, the apparatus may comprise: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: determine priority related to a sidelink, SL, transmission; receive information related to an SL threshold related to an uplink, UL, transmission from a base station; and perform one of the SL transmission or the UL transmission, based on the priority related to the SL transmission and the SL threshold, wherein the SL transmission and the UL transmission overlap in time domain, and wherein the SL threshold is configured to the first apparatus based on priority related to the UL transmission.

According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be supported. For example, the instructions, when executed, may cause a first user equipment, UE, to: determine priority related to a sidelink, SL, transmission; receive information related to an SL threshold related to an uplink, UL, transmission from a base station; and perform one of the SL transmission or the UL transmission, based on the priority related to the SL transmission and the SL threshold, wherein the SL transmission and the UL transmission overlap in time domain, and wherein the SL threshold is configured to the first apparatus based on priority related to the UL transmission.

<FIG> shows a procedure for a base station to receive UL transmission, according to an embodiment of the present disclosure.

Referring to <FIG>, in step S1510, a base station may transmit information related to a sidelink, SL, threshold related to an uplink, UL, transmission, based on priority related to an UL transmission to a first apparatus. In step S1520, the base station may receive an UL transmission from the first apparatus. For example, the UL transmission may be performed by the first apparatus based on priority related to an SL transmission and the SL threshold.

The above-described embodiment may be applied to various devices to be described below. For example, a processor <NUM> of a base station <NUM> may control a transceiver <NUM> to transmit information related to a sidelink, SL, threshold related to an uplink, UL, transmission, based on priority related to an UL transmission to a first apparatus <NUM>. And, the processor <NUM> of the base station <NUM> may control the transceiver <NUM> to receive an UL transmission from the first apparatus <NUM>. For example, the UL transmission may be performed by the first apparatus based on priority related to an SL transmission and the SL threshold.

According to an embodiment of the present disclosure, a base station for performing wireless communication may be supported. For example, the base station may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: transmit information related to a sidelink, SL, threshold related to an uplink, UL, transmission, based on priority related to an UL transmission to a first apparatus; and receive an UL transmission from the first apparatus, wherein the UL transmission is performed by the first apparatus based on priority related to an SL transmission and the SL threshold.

Hereinafter, an apparatus to which various embodiments of the present disclosure can be applied will be described.

<FIG> shows a communication system <NUM>, in accordance with an embodiment of the present disclosure.

Referring to <FIG>, a communication system <NUM> to which various embodiments of the present disclosure are applied includes wireless devices, Base Stations (BSs), and a network. Herein, the wireless devices represent devices performing communication using Radio Access Technology (RAT) (e.g., <NUM> New RAT (NR)) or Long-Term Evolution (LTE)) and may be referred to as communication/radio/SG devices. The wireless devices may include, without being limited to, a robot 100a, vehicles 100b-<NUM> and 100b-<NUM>, an extended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an Artificial Intelligence (AI) device/server <NUM>. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. Herein, the vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). For example, the BSs and the network may be implemented as wireless devices and a specific wireless device 200a may operate as a BS/network node with respect to other wireless devices.

Wireless communication/connections 150a, 150b, or 150c may be established between the wireless devices 100a to 100fBS <NUM>, or BS 200BS <NUM>. Herein, the wireless communication/connections may be established through various RATs (e.g., <NUM> NR) such as uplink/downlink communication 150a, sidelink communication 150b (or, D2D communication), or inter BS communication(e.g. relay, Integrated Access Backhaul(IAB)). The wireless devices and the BSs/the wireless devices may transmit/receive radio signals to/from each other through the wireless communication/connections 150a and 150b. For example, the wireless communication/connections 150a and 150b may transmit/receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.

<FIG> shows wireless devices, in accordance with an embodiment of the present disclosure.

<FIG> shows a signal process circuit for a transmission signal, in accordance with an embodiment of the present disclosure.

<FIG> shows another example of a wireless device, in accordance with an embodiment of the present disclosure.

<FIG> shows a hand-held device, in accordance with an embodiment of the present disclosure. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), or a portable computer (e.g., a notebook). The hand-held device may be referred to as a mobile station (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

<FIG> shows a vehicle or an autonomous vehicle, in accordance with an embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aerial Vehicle (AV), a ship, etc..

For example, the communication unit <NUM> may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit <NUM> may control the driving unit 140a such that the vehicle or the autonomous vehicle <NUM> may move along the autonomous driving path according to the driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit <NUM> may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain a vehicle state and/or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit <NUM> may transfer information about a vehicle position, the autonomous driving path, and/or the driving plan to the external server. The external server may predict traffic information data using AI technology, etc., based on the information collected from vehicles or autonomous vehicles and provide the predicted traffic information data to the vehicles or the autonomous vehicles.

Claim 1:
A method for performing, by a first apparatus, wireless communication, the method comprising:
obtaining (S1410) a priority value related to a sidelink, SL, communication;
obtaining (S1420) information related to a first SL threshold for prioritization between the SL communication and an uplink, UL, transmission;
based on the UL transmission being related to a high priority:
based on a second SL threshold related to ultra reliable and low latency communication, URLLC, being configured:
performing a prioritization between the SL communication and the UL transmission related to URLLC, based on the priority value related to the SL communication and the second SL threshold; and
performing (S1430) the prioritized one of the SL communication or the UL transmission;
based on the second SL threshold being not configured, performing the UL transmission,
wherein the SL communication and the UL transmission overlap in a time domain.