Patent Publication Number: US-2023156731-A1

Title: PDCCH Monitoring Periodicity

Description:
TECHNICAL FIELD 
     Particular embodiments are directed to wireless communications and, more particularly, to a periodicity for monitoring physical downlink control channels (PDCCH). 
     INTRODUCTION 
     The new radio (NR) standard in Third Generation Partnership Project (3GPP) includes service for multiple use cases such as enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and machine type communication (MTC). Each of these services has different technical requirements. For example, the general requirement for eMBB is high data rate with moderate latency and moderate coverage, while URLLC service requires a low latency and high reliability transmission, but perhaps for moderate data rates. 
     One solution for low latency data transmission is shorter transmission time intervals. In NR, in addition to transmission in a slot, a mini-slot transmission is used to reduce latency. A mini-slot may consist of any number of 1 to 14 orthogonal frequency division multiplexing (OFDM) symbols. The concepts of slot and mini-slot are not specific to a specific service, meaning that a mini-slot may be used for either eMBB, URLLC, or other services. 
       FIG.  1    illustrates an example radio resource in new radio (NR). The horizontal axis represents time and the other axis represents frequency. Each resource element corresponds to one OFDM subcarrier during one OFDM symbol interval. 
     The 3GPP NR standard includes a monitoring periodicity that can be configured for a user equipment (UE)-specific control-resource set (CORESET). The monitoring periodicity may be configured per CORESET or for a set of physical downlink control channel (PDCCH) candidates within the CORESET. Different monitoring periodicities for different search spaces provide flexibility. 
     A problem, however, is if different monitoring periodicities are configured for different search spaces, then a UE may have to perform several blind decodings in a slot with multiple PDCCHs but perform very few blind decodings on the other slots. 
     SUMMARY 
     The embodiments described herein include adjusting and distributing physical downlink control channel (PDCCH) monitoring occasions so that the number of blind decodes in every slot is the same (or close to the same) to efficiently use available blind decoding opportunities. 
     According to some embodiments, a method in a network node for configuring monitoring occasions for use in a network node of a wireless communication network comprises determining a PDCCH search space monitoring configuration for a wireless device. The PDCCH search space monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The method further comprises sending the monitoring configuration to the wireless device. 
     According to some embodiments, a network node is capable of configuring monitoring occasions in a wireless communication network. The network node comprises processing circuitry operable to determine a PDCCH search space monitoring configuration for a wireless device. The PDCCH search space monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The processing circuitry is further operable to send the monitoring configuration to the wireless device. 
     A particular advantage is that the number of blind decodes is configurable for each search space. Accordingly, the network node is able to optimize the available blind decoding opportunities. 
     In particular embodiments, a total number of blind decodes to be performed in each slot of the plurality of slots is equivalent for all slots. In some embodiments, the number of blind decodes for each search space is equivalent for all slots. The number of blind decodes for each search space may vary among slots. The number of blind decodes for each search space in a slot may be equivalent for all search spaces in the slot. The number of blind decodes for each search space in a slot may vary among search spaces in the slot. 
     In particular embodiments, a total number of blind decodes to be performed in a slot of the plurality of slots exceeds a total number of blind decodes that the wireless device is capable of performing in the slot. The PDCCH search space monitoring configuration may further comprise an indication whether a search space may be monitored using fewer than the configured number of blind decodes. The indication whether the search space may be monitored using fewer than the configured number of blind decodes may comprise an indication of whether a search space is a common search space or a user equipment specific search space. 
     A particular advantage is that the network node may oversubscribe the number of blind decodes for a slot or search space. The wireless device then determines an optimal use of blind decodes by determining which slots and search spaces to limit the number of blind decodes. 
     According to some embodiments, a method for use in a wireless device of monitoring signals comprises receiving a PDCCH search space monitoring configuration from a network node. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The method further comprises monitoring each search space according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). 
     In particular embodiments, a total number of blind decodes to be performed in each slot of the plurality of slots is equivalent for all slots. In some embodiments, the number of blind decodes for each search space is equivalent for all slots. The number of blind decodes for each search space may vary among slots. The number of blind decodes for each search space in a slot may be equivalent for all search spaces in the slot. The number of blind decodes for each search space in a slot may vary among search spaces in the slot. 
     In particular embodiments, the total number of blind decodes to be performed in a slot of the plurality of slots exceeds a total number of blind decodes that the wireless device is capable of performing in the slot. The method further comprises limiting a number of blind decodes to be performed in one more search spaces so that the total number of blind decodes in each slot is less than or equal to the total number of blind decodes that the wireless device is capable of performing in the slot. Limiting the number of blind decodes may be based on preconfigured rules for prioritizing a first search space over a second search space. In some embodiments, the PDCCH search space monitoring configuration further comprises an indication whether a search space may be monitored using fewer than the configured number of blind decodes. The indication whether the search space may be monitored using fewer than the configured number of blind decodes may comprise an indication of whether a search space is a common search space or a user equipment specific search space. 
     According to some embodiments, a wireless device is capable of monitoring signals in a wireless communication network. The wireless device comprises processing circuitry operable to receive a PDCCH search space monitoring configuration from a network node. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The processing circuitry is further operable to monitor each search space according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). 
     In particular embodiments, a total number of blind decodes to be performed in each slot of the plurality of slots is equivalent for all slots. In some embodiments, the number of blind decodes for each search space is equivalent for all slots. The number of blind decodes for each search space may vary among slots. The number of blind decodes for each search space in a slot may be equivalent for all search spaces in the slot. The number of blind decodes for each search space in a slot may vary among search spaces in the slot. 
     In particular embodiments, the total number of blind decodes to be performed in a slot of the plurality of slots exceeds a total number of blind decodes that the wireless device is capable of performing in the slot. The processing circuitry is further operable to limit a number of blind decodes to be performed in one or more search spaces so that the total number of blind decodes in each slot is less than or equal to the total number of blind decodes that the wireless device is capable of performing in the slot. In some embodiments, the processing circuitry is operable to limit the number of blind decodes based on preconfigured rules for prioritizing a first search space over a second search space. The PDCCH search space monitoring configuration may further comprise an indication whether a search space may be monitored using fewer than the configured number of blind decodes. The indication whether the search space may be monitored using fewer than the configured number of blind decodes may comprise an indication of whether a search space is a common search space or a user equipment specific search space. 
     According to some embodiments, a network node is capable of configuring monitoring occasions in a wireless communication network. The network node comprises a determining module and a transmitting module. The determining module is operable to determine a PDCCH search space monitoring configuration for a wireless device. The PDCCH search space monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The transmitting module is operable to send the monitoring configuration to the wireless device. 
     According to some embodiments, a wireless device is capable of monitoring signals in a wireless communication network. The wireless device comprises a receiving module and a determining module. The receiving module is operable to receive a PDCCH search space monitoring configuration from a network node. The monitoring configuration comprising a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The determining module is operable to monitor each search space according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). 
     Also disclosed is a computer program product. The computer program product comprises instructions stored on non-transient computer-readable media which, when executed by a processor, perform the step of determining a PDCCH search space monitoring configuration for a wireless device. The PDCCH search space monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The instructions further perform the step of sending the monitoring configuration to the wireless device. 
     Another computer program product comprises instructions stored on non-transient computer-readable media which, when executed by a processor, perform the step of receiving a PDCCH search space monitoring configuration from a network node. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The instructions further perform the step of monitoring each search space according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). Particular embodiments may include some, all, or none of the following advantages. 
     For example, particular embodiments distribute the number of blind decodes over multiple monitoring occasions, which can be advantageous because the user equipment (UE) is only capable of performing a certain number of blind decodes at a time. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a more complete understanding of the embodiments and their features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    illustrates an example radio resource in new radio (NR); 
         FIG.  2    is a block diagram illustrating an example wireless network, according to a particular embodiment; 
         FIG.  3    is a block diagram illustrating two CORESETs with different search spaces and different periodicities, according to some embodiments; 
         FIGS.  4 - 7    are block diagrams illustrating two CORESETs with different search spaces and different periodicities and the monitoring occasions associated with each CORESET, according to particular embodiments; 
         FIG.  8    is a flow diagram illustrating an example method in a network node, according to particular embodiments; 
         FIG.  9    is a flow diagram illustrating an example method in a wireless device, according to particular embodiments; 
         FIG.  10 A  is a block diagram illustrating an example embodiment of a wireless device; 
         FIG.  10 B  is a block diagram illustrating example components of a wireless device; 
         FIG.  11 A  is a block diagram illustrating an example embodiment of a network node; and 
         FIG.  11 B  is a block diagram illustrating example components of a network node. 
     
    
    
     DETAILED DESCRIPTION 
     Third Generation Partnership Project (3GPP) new radio (NR) includes services such as enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and machine type communication (MTC). Each of these services has different technical requirements with respect to data rate, latency, and coverage levels. To support these features. NR includes transmission in a slot as well as a mini-slot to reduce latency. 
     The 3GPP NR standard includes a monitoring periodicity that can be configured for a user equipment (UE)-specific control-resource set (CORESET). The monitoring periodicity may be configured per CORESET or for a set of physical downlink control channel (PDCCH) candidates within the CORESET. Different monitoring periodicities for different search spaces provide flexibility. 
     A problem, however, is if different monitoring periodicities are configured for different search spaces, then a UE may have to perform several blind decodings in a slot with multiple PDCCHs but perform very few blind decodings on the other slots. Particular embodiments obviate the problem described above and include adjusting and distributing PDCCH monitoring occasions so that the number of blind decodes in every slot is the same (or nearly the same), which can be advantageous because the UE is only capable of performing a certain number of blind decodes at a time. 
     References in the specification to “one embodiment,” “an embodiment,” “an example embodiment,” etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to implement such feature, structure, or characteristic in connection with other embodiments, whether or not explicitly described. 
     Particular embodiments are described with reference to  FIGS.  2 - 11 B  of the drawings, like numerals being used for like and corresponding parts of the various drawings. long term evolution (LTE) and fifth generation (5G) NR are used throughout this disclosure as an example cellular system, but the ideas presented herein may apply to other wireless communication systems as well. 
       FIG.  2    is a block diagram illustrating an example wireless network, according to a particular embodiment. Wireless network  100  includes one or more wireless devices  110  (such as mobile phones, smart phones, laptop computers, tablet computers, MTC devices, or any other devices that can provide wireless communication) and a plurality of network nodes  120  (such as base stations, eNodeBs, gNBs, etc.). Wireless device  110  may also be referred to as a UE. Network node  120  serves coverage area  115  (also referred to as cell  115 ). 
     In general, wireless devices  110  that are within coverage of network node  120  (e.g., within cell  115  served by network node  120 ) communicate with network node  120  by transmitting and receiving wireless signals  130 . For example, wireless devices  110  and network node  120  may communicate wireless signals  130  containing voice traffic, data traffic, and/or control signals. A network node  120  communicating voice traffic, data traffic, and/or control signals to wireless device  110  may be referred to as a serving network node  120  for the wireless device  110 . Communication between wireless device  110  and network node  120  may be referred to as cellular communication. Wireless signals  130  may include both downlink transmissions (from network node  120  to wireless devices  110 ) and uplink transmissions (from wireless devices  110  to network node  120 ). 
     Each network node  120  may have a single transmitter or multiple transmitters for transmitting signals  130  to wireless devices  110 . In some embodiments, network node  120  may comprise a multiple-input multiple-output (MIMO) system. Wireless signal  130  may comprise one or more beams. Particular beams may be beamformed in a particular direction. Each wireless device  110  may have a single receiver or multiple receivers for receiving signals  130  from network nodes  120  or other wireless devices  110 . Wireless device  110  may receive one or more beams comprising wireless signal  130 . 
     Wireless signals  130  may be transmitted on time-frequency resources. The time-frequency resources may be partitioned into radio frames, subframes, slots, and/or mini-slots. Network node  120  may dynamically schedule subframes/slots/mini-slots as uplink, downlink, or a combination uplink and downlink. Different wireless signals  130  may comprise different transmission processing times. 
     Network node  120  may operate in a licensed frequency spectrum, such as an LTE spectrum. Network node  120  may also operate in an unlicensed frequency spectrum, such as a 5 GHz Wi-Fi spectrum. In an unlicensed frequency spectrum, network node  120  may coexist with other devices such as IEEE 802.11 access points and terminals. To share the unlicensed spectrum, network node  120  may perform LBT protocols before transmitting or receiving wireless signals  130 . Wireless device  110  may also operate in one or both of licensed or unlicensed spectrum and in some embodiments may also perform LBT protocols before transmitting wireless signals  130 . Both network node  120  and wireless device  110  may also operate in licensed shared spectrum. 
     For example, network node  120   a  may operate in a licensed spectrum and network node  120   b  may operate in an unlicensed spectrum. Wireless device  110  may operate in both licensed and unlicensed spectrum. In particular embodiments, network nodes  120   a  and  120   b  may be configurable to operate in a licensed spectrum, an unlicensed spectrum, a licensed shared spectrum, or any combination. Although the coverage area of cell  115   b  is illustrated as included in the coverage area of cell  115   a , in particular embodiments the coverage areas of cells  115   a  and  115   b  may overlap partially or may not overlap at all. 
     In particular embodiments, wireless device  110  and network nodes  120  may perform carrier aggregation. For example, network node  120   a  may serve wireless device  110  as a PCell and network node  120   b  may serve wireless device  110  as a SCell. Network nodes  120  may perform self-scheduling or cross-scheduling. If network node  120   a  is operating in licensed spectrum and network node  120   b  is operating in unlicensed spectrum, network node  120   a  may provide license assisted access to the unlicensed spectrum (i.e., network node  120   a  is a LAA PCell and network node  120   b  is a LAA SCell). 
     In particular embodiments, wireless signals  130  may comprises time/frequency resources that arc grouped in control-resource sets (CORESETs), as described above. Network node  120  may configure wireless device  110  with a monitoring periodicity for wireless device  110  to monitor for particular channels, such as a PDCCH. Network node  120  may configure a number of blind decodes associated with each search space, CORESET, or DCI format. Wireless device  110  receives the monitoring configuration from network node  120 . Wireless device may perform blind decoding according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). In some embodiments, wireless device may modify the monitoring configuration (e.g., the network node configured more blind decodes than wireless device  110  is capable of and wireless device  110  determines which search space, CORESET, or DCI format to limit. Further details are described below and with respect to  FIGS.  3 - 9   . 
     In wireless network  100 , each network node  120  may use any suitable radio access technology, such as long term evolution (LTE), LTE-Advanced, UMTS, HSPA, GSM, cdma2000, NR, WiMax, WiFi, and/or other suitable radio access technology. Wireless network  100  may include any suitable combination of one or more radio access technologies. For purposes of example, various embodiments may be described within the context of certain radio access technologies. However, the scope of the disclosure is not limited to the examples and other embodiments could use different radio access technologies. 
     As described above, embodiments of a wireless network may include one or more wireless devices and one or more different types of radio network nodes capable of communicating with the wireless devices. The network may also include any additional elements suitable to support communication between wireless devices or between a wireless device and another communication device (such as a landline telephone). A wireless device may include any suitable combination of hardware and/or software. For example, in particular embodiments, a wireless device, such as wireless device  110 , may include the components described with respect to  FIG.  10 A  below. Similarly, a network node may include any suitable combination of hardware and/or software. For example, in particular embodiments, a network node, such as network node  120 , may include the components described with respect to  FIG.  11 A  below. 
     While the embodiments below are described using an example of blind decodes assigned to specific search spaces, the embodiments equally cover the application of the same principles to CORESETs or to DCI formats as well. 
     Particular embodiments include configuring PDCCH monitoring occasions to maximally use blind decoding capability. According to some embodiments, PDCCH monitoring periodicity and occasions are configured such that the number of blind decodes in every slot is the same. An example is illustrated in  FIGS.  3  and  4   . 
       FIG.  3    is a block diagram illustrating two CORESETs with different search spaces and different periodicities, according to some embodiments. In the illustrated example, CORESET  0  is transmitted in Slots  0 ,  1 ,  2 ,  3  . . . and has search spaces X and Y. CORESET  1  is transmitted in slots  1 , 3 , 5 , . . . and has search space Z. 
       FIG.  4    is a block diagram illustrating two CORESETs with different search spaces and different periodicities and an equivalent number of blind decodes for each monitoring occasion, according to a particular embodiment. To keep the number of blind decodes the same, the UE monitors search space X with periodicity  0 ,  1 ,  2 , . . . , and search space Y with periodicity  0 ,  2 ,  4 , . . . and search space Z with periodicity  1 ,  3 ,  5 , . . . as illustrated. The illustrated example includes a total of 44 blind decodes that can be performed within a slot. Other embodiments may include any suitable number of blind decodes and any suitable periodicity. 
     Particular embodiments include configuring blind decodes to maximally utilize blind decoding capability. According to some embodiments, the blind decodes that are assigned may be different in different slots and may have different periodicities associated with them. An example is illustrated in  FIG.  5   . 
       FIG.  5    is a block diagram illustrating two CORESETs with different search spaces and different periodicities where a number of blind decodes varies among slots, according to a particular embodiment. The monitoring periodicity for search spaces X and Y is such that the search spaces are monitored in every slot. However, the number of blind decodes assigned to the search space vary depending on the slot. In the illustrated example, the configuration is as follows. 
     Search space X and Y: Perform  22  blind decodes in slots  0 ,  2 ,  4  . . . and 16 blind decodes in slots  1 ,  3 ,  5 , . . . . Some irregular patterns with larger duty cycles may also be configured and that this is just a simple example. In the illustrated example, search space Z has a monitoring periodicity that does not require monitoring in every slot but that has the same number of blind decodes assigned to it every time the search space is monitored. 
     It is possible that different search spaces may have the same monitoring periodicity, but one search space may have its blind decodes vary depending on the slot while the other one does not. An example is illustrated in  FIG.  6   . 
       FIG.  6    is another block diagram illustrating two CORESETs with different search spaces and different periodicities where a number of blind decodes varies among slots, according to a particular embodiment. The illustrated example may be interpreted as search space Z borrowing blind decodes only from one of the other search spaces. 
     Particular embodiments include CORESET monitoring prioritization. In the previous embodiments, the gNB configures the monitoring periodicities and blind decodes appropriately so that the UE follows the particular semi-static configuration given by the gNB. 
     In some embodiments, the gNB can configure monitoring periodicities and blind decodes to the UE such that the maximum blind decoding capability in a given slot is nominally exceeded. However, the UE limits the number of blind decodes actually performed to the number the UE is capable of by prioritizing the monitoring of certain CORESETs or search spaces or DCI formats over others. An example is illustrated in  FIG.  7     
       FIG.  7    is a block diagram illustrating two CORESETs with different search spaces and different periodicities where a number of blind decodes may exceed the UE capacity, according to a particular embodiment. In the illustrated example, search spaces X, Y and Z are all configured with  22  blind decodes each. The UE automatically adjusts the blind decodes to fit within the capability by applying some prioritization between search spaces. The configuration could include these prioritizations. 
     In a particular embodiment, search space j could be assigned a priority number, p j . The blind decodes can then be adjusted at the UE so that the blind decodes for search space j is given by 
         B   j =└( o   4 /Σ k    p   k )· B   M ┘,
 
     where B j  is the number of blind decodes assigned to search space j and B M  is the maximum number of blind decodes in a slot. 
     While this is a general prioritization rule that may be applied, simpler rules may also be used. In one variation of this embodiment, the configuration of a search space may explicitly indicate whether blind decodes from this search space can be borrowed for another search space or not. Blind decodes are then reduced only for search spaces whose configuration indicates that borrowing is allowed. For example, blind decodes for a common search space may be indicated as being fixed, while those for a UE search space may be indicated as being able to be reduced. 
     Similarly, the configuration of a particular search space may also indicate that this search space is a high priority search space, and that the search space is allowed to borrow blind decodes from other lower priority search spaces. 
     In another variation of this embodiment, the configuration for a search space may explicitly provide a pointer to other search spaces from which blind decodes may be borrowed by the UE. 
     In another variation of this embodiment, the prioritization or the ability to borrow blind decodes or not may be dependent on the location of the search space and CORESET in the slot. For instance, blind decodes may be borrowed only from UE specific search spaces at the beginning of a slot (say in the first three OFDM symbols), but not those that occur elsewhere in the slot, or vice-versa. 
     General examples of the embodiments described above are illustrated in  FIGS.  8  and  9   .  FIG.  8    is an example in a network node, such as a gNB, and  FIG.  9    is an example in a wireless device, such as a UE. 
       FIG.  8    is a flow diagram illustrating an example method in a network node, according to particular embodiments. In particular embodiments, one or more steps of  FIG.  8    may be performed by network node  120  of network  100  described with respect to  FIG.  3   . 
     The method begins at step  812 , where a network node determines a monitoring configuration for a wireless device. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. For example, network node  120  may determine a monitoring configuration for a number of search spaces according to any of the embodiments and examples described with respect to  FIGS.  3 - 7   . 
     In particular embodiments, a total number of blind decodes to be performed in each slot of the plurality of slots is equivalent for all slots (see, e.g.,  FIGS.  4 - 6   ). In some embodiments, the number of blind decodes for each search space is equivalent for all slots (see, e.g., search space X of  FIG.  4   ). The number of blind decodes for each search space may vary among slots (see, e.g., search space Y of  FIG.  5   ). The number of blind decodes  30  for each search space in a slot may be equivalent for all search spaces in the slot (see, e.g., Slot  0  of  FIG.  5   ). The number of blind decodes for each search space in a slot may vary among search spaces in the slot (see, e.g., Slot  1  of  FIG.  5   ). In particular embodiments, the total number of blind decodes to be performed in a slot of the plurality of slots exceeds a total number of blind decodes that the wireless device is capable of performing in the slot (see, e.g., Slot  1  of  FIG.  7   ). 
     At step  814 , the network node sends the monitoring configuration to the wireless device. For example, network node  120  may send the monitoring configuration to wireless device  110 . 
     Modifications, additions, or omissions may be made to method  800  of  FIG.  8   . Additionally, one or more steps in the method of  FIG.  8    may be performed in parallel or in any suitable order. The steps may be repeated over time as necessary. 
       FIG.  9    is a flow diagram illustrating an example method in a wireless device, according to particular embodiments. In particular embodiments, one or more steps of  FIG.  9    may be performed by wireless device  110  of network  100  described with respect to  FIG.  2   . 
     The method begins at step  912 , where a wireless device receives a monitoring configuration from a network node. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. For example, wireless device  110  may receive a monitoring configuration for a number of search spaces according to any of the embodiments and examples described with respect to  FIGS.  3 - 7   . Particular configurations are also described with respect to step  812  of  FIG.  8   . 
     At step  914 , the wireless device may limit a number of blind decodes for one or more search spaces. For example, the total number of blind decodes to be performed in a slot of the plurality of slots may exceed a total number of blind decodes that the wireless device is capable of performing in the slot. The wireless device may limit a number of blind decodes to be performed in one more search spaces so that the total number of blind decodes in each slot is less than or equal to the total number of blind decodes that the wireless device is capable of performing in the slot. 
     Limiting the number of blind decodes may be based on preconfigured rules for prioritizing a first search space over a second search space. In some embodiments, the PDCCH search space monitoring configuration further comprises an indication whether a search space may be monitored using fewer than the configured number of blind decodes. 
     The indication whether the search space may be monitored using fewer than the configured number of blind decodes may comprise an indication of whether a search space is a common search space or a user equipment specific search space. 
     At step  916 , the wireless device monitors each search space according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). For example, wireless device  110  may monitor the search space according to the monitoring configuration received from network node  120  in step  912 , and according to any modifications or limitations from step  914 . 
     Modifications, additions, or omissions may be made to method  900  of  FIG.  9   . Additionally, one or more steps in the method of  FIG.  9    may be performed in parallel or in any suitable order. The steps may be repeated over time as necessary. 
       FIG.  10 A  is a block diagram illustrating an example embodiment of a wireless device. The wireless device is an example of the wireless devices  110  illustrated in  FIG.  2   . In particular embodiments, the wireless device is capable of receiving a monitoring configuration from a network node. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space of a plurality of search spaces over a plurality of slots. The wireless device may also monitor each search space according to the monitoring configuration (i.e., the monitoring periodicity and the number of blind decodes). If the total number of blind decodes to be performed in a slot exceeds a total number of blind decodes that the wireless device is capable of performing in the slot, then the wireless device may limit a number of blind decodes to be performed in one more search spaces. 
     Particular examples of a wireless device include a mobile phone, a smart phone, a PDA (Personal Digital Assistant), a portable computer (e.g., laptop, tablet), a sensor, a modem, a machine type (MTC) device/machine to machine (M2M) device, laptop embedded equipment (LEE), laptop mounted equipment (LME), USB dongles, a device-to-device capable device, a vehicle-to-vehicle device, or any other device that can provide wireless communication. The wireless device includes transceiver  1310 , processing circuitry  1320 , memory  1330 , and power source  1340 . In some embodiments, transceiver  1310  facilitates transmitting wireless signals to and receiving wireless signals from wireless network node  120  (e.g., via an antenna), processing circuitry  1320  executes instructions to provide some or all of the functionality described herein as provided by the wireless device, and memory  1330  stores the instructions executed by processing circuitry  1320 . Power source  1340  supplies electrical power to one or more of the components of wireless device  110 , such as transceiver  1310 , processing circuitry  1320 , and/or memory  1330 . 
     Processing circuitry  1320  includes any suitable combination of hardware and software implemented in one or more integrated circuits or modules to execute instructions and manipulate data to perform some or all of the described functions of the wireless device. In some embodiments, processing circuitry  1320  may include, for example, one or more computers, one more programmable logic devices, one or more central processing units (CPUs), one or more microprocessors, one or more applications, and/or other logic, and/or any suitable combination of the preceding. Processing circuitry  1320  may include analog and/or digital circuitry configured to perform some or all of the described functions of wireless device  110 . For example, processing circuitry  1320  may include resistors, capacitors, inductors, transistors, diodes, and/or any other suitable circuit components. 
     Memory  1330  is generally operable to store computer executable code and data. Examples of memory  1330  include computer memory (e.g., Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (e.g., a hard disk), removable storage media (e.g., a Compact Disk (CD) or a Digital Video Disk (DVD)), and/or or any other volatile or non-volatile, non-transitory computer-readable and/or computer-executable memory devices that store information. 
     Power source  1340  is generally operable to supply electrical power to the components of wireless device  110 . Power source  1340  may include any suitable type of battery, such as lithium-ion, lithium-air, lithium polymer, nickel cadmium, nickel metal hydride, or any other suitable type of battery for supplying power to a wireless device. 
     Other embodiments of the wireless device may include additional components (beyond those shown in  FIG.  10 A ) responsible for providing certain aspects of the wireless device&#39;s functionality, including any of the functionality described above and/or any additional functionality (including any functionality necessary to support the solution described above). 
       FIG.  10 B  is a block diagram illustrating example components of a wireless device  110 . The components may include determining module  1350 , transmitting module  1352  and receiving module  1354 . 
     Determining module  1350  may perform the determining functions of wireless device  110 . For example, determining module  1350  may determine total number of blind decodes to be performed in a slot of the plurality of slots exceeds a total number of blind decodes that the wireless device is capable of performing in the slot, and limit a number of blind decodes to be performed in one more search spaces (or CORESETS, DCI format, etc.) according to any of the examples and embodiments described above. In certain embodiments, determining module  1350  may include or be included in processing circuitry  1320 . In particular embodiments, determining module  1350  may communicate with transmitting module  1352  and receiving module  1354 . 
     Transmitting module  1352  may perform the transmitting functions of wireless device  110 . In certain embodiments, transmitting module  1352  may include or be included in processing circuitry  1320 . In particular embodiments, transmitting module  1352  may communicate with determining module  1350  and receiving module  1354 . 
     Receiving module  1354  may perform the receiving functions of wireless device  110 . For example, receiving module  1354  may receive a monitoring configuration according to any of the examples and embodiments described above. In certain embodiments, receiving module  1354  may include or be included in processing circuitry  1320 . In particular embodiments, transmitting module  1352  may communicate with determining module  1350  and transmitting module  1352 . 
       FIG.  11 A  is a block diagram illustrating an example embodiment of a network node. The network node is an example of the network node  120  illustrated in  FIG.  2   . In particular embodiments, the network node is capable of determining a monitoring configuration for a wireless device. The monitoring configuration comprises a monitoring periodicity and a number of blind decodes for each search space (or CORESETS, DCI format, etc.) of a plurality of search spaces (or CORESETS, DCI format, etc.) over a plurality of slots. The network node is capable of sending the monitoring configuration to a wireless device. 
     Network node  120  can be an eNodeB, a nodeB, a base station, a wireless access point (e.g., a Wi-Fi access point), a low power node, a base transceiver station (BTS), a transmission point or node, a remote RF unit (RRU), a remote radio head (RRH), or other radio access node. The network node includes at least one transceiver  1410 , at least one processing circuitry  1420 , at least one memory  1430 , and at least one network interface  1440 . Transceiver  1410  facilitates transmitting wireless signals to and receiving wireless signals from a wireless device, such as wireless devices  110  (e.g., via an antenna); processing circuitry  1420  executes instructions to provide some or all of the functionality described above as being provided by a network node  120 ; memory  1430  stores the instructions executed by processing circuitry  1420 ; and network interface  1440  communicates signals to backend network components, such as a gateway, switch, router, Internet, Public Switched Telephone Network (PSTN), controller, and/or other network nodes  120 . Processing circuitry  1420  and memory  1430  can be of the same types as described with respect to processing circuitry  1320  and memory  1330  of  FIG.  10 A  above. 
     In some embodiments, network interface  1440  is communicatively coupled to processing circuitry  1420  and refers to any suitable device operable to receive input for network node  120 , send output from network node  120 , perform suitable processing of the input or output or both, communicate to other devices, or any combination of the preceding. Network interface  1440  includes appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, to communicate through a network. 
       FIG.  11 B  is a block diagram illustrating example components of a network node  120 . The components may include determining module  1450 , transmitting module  1452  and receiving module  1454 . 
     Determining module  1450  may perform the determining functions of network node  120 . For example, determining module  1450  may determine a monitoring configuration for a wireless device according to any of the examples and embodiments described above. In certain embodiments, determining module  1450  may include or be included in processing circuitry  1420 . In particular embodiments, determining module  1450  may communicate with transmitting module  1452  and receiving module  1454 . 
     Transmitting module  1452  may perform the transmitting functions of network node  120 . For example, transmitting module  1452  may transmit a monitoring configuration to a wireless device according to any of the examples and embodiments described above. In certain embodiments, transmitting module  1452  may include or be included in processing circuitry  1420 . In particular embodiments, transmitting module  1452  may communicate with determining module  1450  and receiving module  1454 . 
     Receiving module  1454  may perform the receiving functions of network node  120 . In certain embodiments, receiving module  1454  may include or be included in processing circuitry  1420 . In particular embodiments, transmitting module  1452  may communicate with determining module  1450  and transmitting module  1452 . 
     Modifications, additions, or omissions may be made to the systems and apparatuses disclosed herein without departing from the scope of the invention. The components of the systems and apparatuses may be integrated or separated. Moreover, the operations of the systems and apparatuses may be performed by more, fewer, or other components. Additionally, operations of the systems and apparatuses may be performed using any suitable logic comprising software, hardware, and/or other logic. As used in this document, “each” refers to each member of a set or each member of a subset of a set. 
     Modifications, additions, or omissions may be made to the methods disclosed herein without departing from the scope of the invention. The methods may include more, fewer, or other steps. Additionally, steps may be performed in any suitable order. 
     Although this disclosure has been described in terms of certain embodiments, alterations and permutations of the embodiments will be apparent to those skilled in the art. Accordingly, the above description of the embodiments does not constrain this disclosure. Other changes, substitutions, and alterations arc possible without departing from the spirit and scope of this disclosure, as defined by the claims below. 
     Abbreviations used in the preceding description include: 3GPP Third Generation Partnership Project 
     BBU Baseband Unit 
     BTS Base Transceiver Station 
     CC Component Carrier 
     CORESET Control-Resource Set 
     CQI Channel Quality Information 
     CSI Channel State Information 
     D2D Device to Device 
     DFT Discrete Fourier Transform 
     DMRS Demodulation Reference Signal 
     eMBB Enhanced Mobile Broadband 
     eNB eNodeB 
     FDD Frequency Division Duplex 
     FFT Fast Fourier Transform 
     gNB Next-generation NodeB 
     LAA Licensed-Assisted Access 
     LBT Listen-before-talk 
     LTE Long Term Evolution 
     LTE-U LTE in Unlicensed Spectrum 
     M2M Machine to Machine 
     MC S Modulation and Coding Scheme 
     MIB Master Information Block 
     MIMO Multi-Input Multi-Output 
     MTC Machine Type Communication 
     NR New Radio 
     OFDM Orthogonal Frequency Division Multiplexing 
     PDCCH Physical Downlink Control Channel 
     PRB Physical Resource Block 
     PUCCH Physical Uplink Control Channel 
     P U SCH Physical Uplink Shared Channel 
     RAN Radio Access Network 
     RAT Radio Access Technology 
     RBS Radio Base Station 
     RNC Radio Network Controller 
     RRC Radio Resource Control 
     RRH Remote Radio Head 
     RRU Remote Radio Unit 
     SCell Secondary Cell 
     SI System Information 
     SIB System Information Block 
     SR Scheduling Request 
     TB Transport Block 
     TBS Transport Block Size 
     TDD Time Division Duplex 
     TTI Transmission Time Interval 
     UE User Equipment 
     UL Uplink 
     URLLC Ultra Reliable Low Latency Communication 
     UTRAN Universal Terrestrial Radio Access Network 
     WAN Wireless Access Network