Patent Publication Number: US-2023156777-A1

Title: Techniques for handling scheduling conflicts between access link communications and sidelink communications

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 16/943,346, filed Jul. 30, 2020, entitled “TECHNIQUES FOR HANDLING SCHEDULING CONFLICTS BETWEEN ACCESS LINK COMMUNICATIONS AND SIDELINK COMMUNICATIONS,” which claims priority to U.S. Provisional Patent Application No. 62/880,888, filed on Jul. 31, 2019, entitled “TECHNIQUES FOR HANDLING SCHEDULING CONFLICTS BETWEEN ACCESS LINK COMMUNICATIONS AND SIDELINK COMMUNICATIONS,” the contents of which are incorporated herein by reference in their entireties. 
    
    
     FIELD OF THE DISCLOSURE 
     Aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for handling scheduling conflicts between access link communications and sidelink communications. 
     DESCRIPTION OF RELATED ART 
     Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP). 
     A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A user equipment (UE) may communicate with a base station (BS) via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a New Radio (NR) BS, a 5G Node B, and/or the like. 
     The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate on a municipal, national, regional, and even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies. 
     SUMMARY 
     In some aspects, a method of wireless communication, performed by a first user equipment (UE), may include identifying a first set of resources for an access link communication between the first UE and a base station; identifying a second set of resources for a sidelink communication between the first UE and a second UE; identifying a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication; and dropping at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the prioritization rule indicates that access link communications have a higher priority than sidelink communications. 
     In some aspects, the dropping comprises dropping at least a portion of the second set of resources for the sidelink communication based at least in part on the prioritization rule. 
     In some aspects, the dropping is further based at least in part on a capability of the first UE. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the dropping comprises dropping a subset of sidelink communications scheduled for the first UE to permit the first UE to receive the access link communication. 
     In some aspects, the sidelink communication is a transmission from the second UE to the first UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the first UE is configured to transmit a negative acknowledgement (NACK) corresponding to the transmissions, and the NACK is transmitted in connection with an indication that the NACK is due to the scheduling conflict. 
     In some aspects, the first UE is configured to receive an indication that multiple transmissions, including the transmission, have been dropped; and refrain from monitoring for the multiple transmissions based at least in part on the indication. 
     In some aspects, the indication that the multiple transmissions have been dropped is received from at least one of the base station or the second UE. 
     In some aspects, the sidelink communication is a transmission from the first UE to the second UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the transmission is dropped and a NACK corresponding to the transmission is not counted, for a procedure that modifies transmissions due to poor channel conditions, based at least in part on dropping the transmission. 
     In some aspects, the transmission is dropped, and the first UE is configured to transmit an indication to the second UE that multiple transmissions, including the transmission, have been dropped. 
     In some aspects, the sidelink communication is a physical sidelink control channel communication, the access link communication is one of a physical downlink control channel communication or a physical uplink control channel communication, and the scheduling conflict is identified based at least in part on a radio resource control message. 
     In some aspects, the sidelink communication is a physical sidelink shared channel communication, the access link communication is one of a physical downlink shared channel communication or a physical uplink shared channel communication, and the scheduling conflict is identified based at least in part on at least one of sidelink control information or downlink control information. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the first UE is configured to transmit an indication of the one or more resources to at least one of the base station or the second UE. 
     In some aspects, a method of wireless communication, performed by a base station, may include identifying a first set of resources for an access link communication between the base station and a first UE; identifying a second set of resources for a sidelink communication between the first UE and a second UE; and identifying a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE. 
     In some aspects, the method includes refraining from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the second set of resources is identified based at least in part on a sidelink resource pool configured by the base station for the first UE. 
     In some aspects, the sidelink resource pool is for sidelink reception. 
     In some aspects, refraining from scheduling at least a portion of the first set of resources comprises refraining from scheduling the access link communication in any resource included in the sidelink resource pool. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the second set of resources is identified from SCI transmitted from the second UE to the first UE. 
     In some aspects, a timing value, indicated in the SCI for timing between the SCI and a corresponding sidelink data communication, satisfies a threshold. 
     In some aspects, the first UE and the second UE are connected to the base station. 
     In some aspects, the first UE is connected to the base station and the second UE is connected to another base station, and the base station is configured to receive a sidelink configuration of the second UE directly or indirectly from the other base station. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the one or more resources are indicated in a message received from at least one of the first UE or the second UE. 
     In some aspects, the message is received from the first UE and the base station is configured to relay the message to the second UE. 
     In some aspects, the one or more resources are configured by the base station and indicated to at least one of the first UE or the second UE. 
     In some aspects, a first UE for wireless communication may include memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to identify a first set of resources for an access link communication between the first UE and a base station; identify a second set of resources for a sidelink communication between the first UE and a second UE; identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication; and drop at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the prioritization rule indicates that access link communications have a higher priority than sidelink communications. 
     In some aspects, the dropping comprises dropping at least a portion of the second set of resources for the sidelink communication based at least in part on the prioritization rule. 
     In some aspects, the dropping is further based at least in part on a capability of the first UE. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the dropping comprises dropping a subset of sidelink communications scheduled for the first UE to permit the first UE to receive the access link communication. 
     In some aspects, the sidelink communication is a transmission from the second UE to the first UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the first UE is configured to transmit a NACK corresponding to the transmissions, and the NACK is transmitted in connection with an indication that the NACK is due to the scheduling conflict. 
     In some aspects, the first UE is configured to receive an indication that multiple transmissions, including the transmission, have been dropped; and refrain from monitoring for the multiple transmissions based at least in part on the indication. 
     In some aspects, the indication that the multiple transmissions have been dropped is received from at least one of the base station or the second UE. 
     In some aspects, the sidelink communication is a transmission from the first UE to the second UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the transmission is dropped and a NACK corresponding to the transmission is not counted, for a procedure that modifies transmissions due to poor channel conditions, based at least in part on dropping the transmission. 
     In some aspects, the transmission is dropped, and the first UE is configured to transmit an indication to the second UE that multiple transmissions, including the transmission, have been dropped. 
     In some aspects, the sidelink communication is a physical sidelink control channel communication and the access link communication is one of a physical downlink control channel communication or a physical uplink control channel communication, and the scheduling conflict is identified based at least in part on a radio resource control message. 
     In some aspects, the sidelink communication is a physical sidelink shared channel communication and the access link communication is one of a physical downlink shared channel communication or a physical uplink shared channel communication, and the scheduling conflict is identified based at least in part on at least one of sidelink control information or downlink control information. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the first UE is configured to transmit an indication of the one or more resources to at least one of the base station or the second UE. 
     In some aspects, a base station for wireless communication may include memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to identify a first set of resources for an access link communication between the base station and a first UE; identify a second set of resources for a sidelink communication between the first UE and a second UE; and identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE. 
     In some aspects, the base station is configured to refrain from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the second set of resources is identified based at least in part on a sidelink resource pool configured by the base station for the first UE. 
     In some aspects, the sidelink resource pool is for sidelink reception. 
     In some aspects, refraining from scheduling at least a portion of the first set of resources comprises refraining from scheduling the access link communication in any resource included in the sidelink resource pool. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the second set of resources is identified from SCI transmitted from the second UE to the first UE. 
     In some aspects, a timing value, indicated in the SCI for timing between the SCI and a corresponding sidelink data communication, satisfies a threshold. 
     In some aspects, the first UE and the second UE are connected to the base station. 
     In some aspects, the first UE is connected to the base station and the second UE is connected to another base station, and the base station is configured to receive a sidelink configuration of the second UE directly or indirectly from the other base station. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the one or more resources are indicated in a message received from at least one of the first UE or the second UE. 
     In some aspects, the message is received from the first UE and the base station is configured to relay the message to the second UE. 
     In some aspects, the one or more resources are configured by the base station and indicated to at least one of the first UE or the second UE. 
     In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a first UE, may cause the one or more processors to: identify a first set of resources for an access link communication between the first UE and a base station; identify a second set of resources for a sidelink communication between the first UE and a second UE; identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication; and drop at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the prioritization rule indicates that access link communications have a higher priority than sidelink communications. 
     In some aspects, the dropping comprises dropping at least a portion of the second set of resources for the sidelink communication based at least in part on the prioritization rule. 
     In some aspects, the dropping is further based at least in part on a capability of the first UE. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the dropping comprises dropping a subset of sidelink communications scheduled for the first UE to permit the first UE to receive the access link communication. 
     In some aspects, the sidelink communication is a transmission from the second UE to the first UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the first UE is configured to transmit a NACK corresponding to the transmissions, and the NACK is transmitted in connection with an indication that the NACK is due to the scheduling conflict. 
     In some aspects, the first UE is configured to receive an indication that multiple transmissions, including the transmission, have been dropped; and refrain from monitoring for the multiple transmissions based at least in part on the indication. 
     In some aspects, the indication that the multiple transmissions have been dropped is received from at least one of the base station or the second UE. 
     In some aspects, the sidelink communication is a transmission from the first UE to the second UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the transmission is dropped and a NACK corresponding to the transmission is not counted, for a procedure that modifies transmissions due to poor channel conditions, based at least in part on dropping the transmission. 
     In some aspects, the transmission is dropped, and the first UE is configured to transmit an indication to the second UE that multiple transmissions, including the transmission, have been dropped. 
     In some aspects, the sidelink communication is a physical sidelink control channel communication and the access link communication is one of a physical downlink control channel communication or a physical uplink control channel communication, and the scheduling conflict is identified based at least in part on a radio resource control message. 
     In some aspects, the sidelink communication is a physical sidelink shared channel communication and the access link communication is one of a physical downlink shared channel communication or a physical uplink shared channel communication, and the scheduling conflict is identified based at least in part on at least one of sidelink control information or downlink control information. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the first UE is configured to transmit an indication of the one or more resources to at least one of the base station or the second UE. 
     In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to: identify a first set of resources for an access link communication between the base station and a first UE; identify a second set of resources for a sidelink communication between the first UE and a second UE; and identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE. 
     In some aspects, the one or more instructions cause the base station to refrain from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the second set of resources is identified based at least in part on a sidelink resource pool configured by the base station for the first UE. 
     In some aspects, the sidelink resource pool is for sidelink reception. 
     In some aspects, refraining from scheduling at least a portion of the first set of resources comprises refraining from scheduling the access link communication in any resource included in the sidelink resource pool. 
     In some aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the second set of resources is identified from SCI transmitted from the second UE to the first UE. 
     In some aspects, a timing value, indicated in the SCI for timing between the SCI and a corresponding sidelink data communication, satisfies a threshold. 
     In some aspects, the first UE and the second UE are connected to the base station. 
     In some aspects, the first UE is connected to the base station and the second UE is connected to another base station, and the base station is configured to receive a sidelink configuration of the second UE directly or indirectly from the other base station. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the one or more resources are indicated in a message received from at least one of the first UE or the second UE. 
     In some aspects, the message is received from the first UE and the base station is configured to relay the message to the second UE. 
     In some aspects, the one or more resources are configured by the base station and indicated to at least one of the first UE or the second UE. 
     In some aspects, a first apparatus for wireless communication may include means for identifying a first set of resources for an access link communication between the first apparatus and a base station; means for identifying a second set of resources for a sidelink communication between the first apparatus and a second apparatus; means for identifying a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication; and means for dropping at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the prioritization rule indicates that access link communications have a higher priority than sidelink communications. 
     In some aspects, the dropping comprises dropping at least a portion of the second set of resources for the sidelink communication based at least in part on the prioritization rule. 
     In some aspects, the dropping is further based at least in part on a capability of the first apparatus. 
     In some aspects, the capability indicates whether the first apparatus is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first apparatus for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first apparatus for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first apparatus for joint access link and sidelink communications scheduled in a same set of resources; whether the first apparatus is capable of communicating using multiple beams; whether the first apparatus is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the dropping comprises dropping a subset of sidelink communications scheduled for the first apparatus to permit the first apparatus to receive the access link communication. 
     In some aspects, the sidelink communication is a transmission from the second apparatus to the first apparatus, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the first apparatus is configured to transmit a NACK corresponding to the transmissions, and the NACK is transmitted in connection with an indication that the NACK is due to the scheduling conflict. 
     In some aspects, the first apparatus is configured to receive an indication that multiple transmissions, including the transmission, have been dropped; and refrain from monitoring for the multiple transmissions based at least in part on the indication. 
     In some aspects, the indication that the multiple transmissions have been dropped is received from at least one of the base station or the second apparatus. 
     In some aspects, the sidelink communication is a transmission from the first apparatus to the second apparatus, and the access link communication is one of an uplink communication or a downlink communication. 
     In some aspects, the transmission is dropped and a NACK corresponding to the transmission is not counted, for a procedure that modifies transmissions due to poor channel conditions, based at least in part on dropping the transmission. 
     In some aspects, the transmission is dropped, and the first apparatus is configured to transmit an indication to the second apparatus that multiple transmissions, including the transmission, have been dropped. 
     In some aspects, the sidelink communication is a physical sidelink control channel communication and the access link communication is one of a physical downlink control channel communication or a physical uplink control channel communication, and the scheduling conflict is identified based at least in part on a radio resource control message. 
     In some aspects, the sidelink communication is a physical sidelink shared channel communication and the access link communication is one of a physical downlink shared channel communication or a physical uplink shared channel communication, and the scheduling conflict is identified based at least in part on at least one of sidelink control information or downlink control information. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first apparatus is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the first apparatus is configured to transmit an indication of the one or more resources to at least one of the base station or the second apparatus. 
     In some aspects, an apparatus for wireless communication may include means for identifying a first set of resources for an access link communication between the apparatus and a first UE; means for identifying a second set of resources for a sidelink communication between the first UE and a second UE; and means for identifying a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE. 
     In some aspects, the apparatus includes means for refraining from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule. 
     In some aspects, the second set of resources is identified based at least in part on a sidelink resource pool configured by the apparatus for the first UE. 
     In some aspects, the sidelink resource pool is for sidelink reception. 
     In some aspects, refraining from scheduling at least a portion of the first set of resources comprises refraining from scheduling the access link communication in any resource included in the sidelink resource pool. 
     In some aspects, the capability indicates whether the first apparatus is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     In some aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In some aspects, the second set of resources is identified from SCI transmitted from the second UE to the first UE. 
     In some aspects, a timing value, indicated in the SCI for timing between the SCI and a corresponding sidelink data communication, satisfies a threshold. 
     In some aspects, the first UE and the second UE are connected to the apparatus. 
     In some aspects, the first UE is connected to the apparatus and the second UE is connected to another apparatus, and the apparatus is configured to receive a sidelink configuration of the second UE directly or indirectly from the other apparatus. 
     In some aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In some aspects, the one or more resources are indicated in a message received from at least one of the first UE or the second UE. 
     In some aspects, the message is received from the first UE and the apparatus is configured to relay the message to the second UE. 
     In some aspects, the one or more resources are configured by the apparatus and indicated to at least one of the first UE or the second UE. 
     Aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and specification. 
     The foregoing has outlined rather broadly the features and technical advantages of examples according to the disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The conception and specific examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. Characteristics of the concepts disclosed herein, both their organization and method of operation, together with associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for the purposes of illustration and description, and not as a definition of the limits of the claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       So that the above-recited features of the present disclosure can be understood in detail, a more particular description, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements. 
         FIG.  1    is a diagram illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure. 
         FIG.  2    is a diagram illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure. 
         FIG.  3    is a diagram illustrating an example of sidelink communications, in accordance with various aspects of the present disclosure. 
         FIG.  4    is a diagram illustrating an example of sidelink communications and access link communications, in accordance with various aspects of the present disclosure. 
         FIGS.  5 - 7    are diagrams illustrating examples of handling scheduling conflicts between access link communications and sidelink communications, in accordance with various aspects of the present disclosure. 
         FIG.  8    is a diagram illustrating an example process performed, for example, by a user equipment, in accordance with various aspects of the present disclosure. 
         FIG.  9    is a diagram illustrating an example process performed, for example, by a base station, in accordance with various aspects of the present disclosure. 
         FIG.  10    is a conceptual data flow diagram illustrating a data flow between different modules/means/components in an example apparatus, in accordance with various aspects of the present disclosure. 
         FIG.  11    is a conceptual data flow diagram illustrating a data flow between different modules/means/components in another example apparatus, in accordance with various aspects of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the disclosure is intended to cover any aspect of the disclosure disclosed herein, whether implemented independently of or combined with any other aspect of the disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method which is practiced using other structure, functionality, or structure and functionality in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim. 
     Several aspects of telecommunication systems will now be presented with reference to various apparatuses and techniques. These apparatuses and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, and/or the like (collectively referred to as “elements”). These elements may be implemented using hardware, software, or combinations thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. 
     It should be noted that while aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies. 
       FIG.  1    is a diagram illustrating a wireless network  100  in which aspects of the present disclosure may be practiced. The wireless network  100  may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network  100  may include a number of BSs  110  (shown as BS  110   a , BS  110   b , BS  110   c , and BS  110   d ) and other network entities. A BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB), an access point, a transmit receive point (TRP), and/or the like. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used. 
     A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. ABS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in  FIG.  1   , a BS  110   a  may be a macro BS for a macro cell  102   a , a BS  110   b  may be a pico BS for a pico cell  102   b , and a BS  110   c  may be a femto BS for a femto cell  102   c . A BS may support one or multiple (e.g., three) cells. The terms “eNB”, “base station”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” may be used interchangeably herein. 
     In some aspects, a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS. In some aspects, the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network  100  through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network. 
     Wireless network  100  may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in  FIG.  1   , a relay station  110   d  may communicate with macro BS  110   a  and a UE  120   d  in order to facilitate communication between BS  110   a  and UE  120   d . A relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like. 
     Wireless network  100  may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network  100 . For example, macro BSs may have a high transmit power level (e.g., 5 to 40 watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts). 
     A network controller  130  may couple to a set of BSs and may provide coordination and control for these BSs. Network controller  130  may communicate with the BSs via a backhaul. The BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul. 
     UEs  120  (e.g.,  120   a ,  120   b ,  120   c ) may be dispersed throughout wireless network  100 , and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium. 
     Some UEs may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices. Some UEs may be considered a Customer Premises Equipment (CPE). UE  120  may be included inside a housing that houses components of UE  120 , such as processor components, memory components, and/or the like. 
     In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, and/or the like. A frequency may also be referred to as a carrier, a frequency channel, and/or the like. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed. 
     In some aspects, two or more UEs  120  (e.g., shown as UE  120   a  and UE  120   e ) may communicate directly using one or more sidelink channels (e.g., without using a base station  110  as an intermediary to communicate with one another). For example, the UEs  120  may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like), a mesh network, and/or the like. In this case, the UE  120  may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station  110 . In some aspects, a UE  120  may operate in a transmission mode where resource selection and/or scheduling is performed by the base station  110 . In some aspects, a UE  120  may operate in a transmission mode where resource selection and/or scheduling is performed by the UE  120 . Additional details regarding sidelink communications are described below in connection with  FIG.  3   . 
     As indicated above,  FIG.  1    is provided as an example. Other examples may differ from what is described with regard to  FIG.  1   . 
       FIG.  2    shows a block diagram of a design  200  of base station  110  and UE  120 , which may be one of the base stations and one of the UEs in  FIG.  1   . Base station  110  may be equipped with T antennas  234   a  through  234   t , and UE  120  may be equipped with R antennas  252   a  through  252   r , where in general T≥1 and R≥1. 
     At base station  110 , a transmit processor  220  may receive data from a data source  212  for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS(s) selected for the UE, and provide data symbols for all UEs. Transmit processor  220  may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols. Transmit processor  220  may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS)) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor  230  may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs)  232   a  through  232   t . Each modulator  232  may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream. Each modulator  232  may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators  232   a  through  232   t  may be transmitted via T antennas  234   a  through  234   t , respectively. According to various aspects described in more detail below, the synchronization signals can be generated with location encoding to convey additional information. 
     At UE  120 , antennas  252   a  through  252   r  may receive the downlink signals from base station  110  and/or other base stations and may provide received signals to demodulators (DEMODs)  254   a  through  254   r , respectively. Each demodulator  254  may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples. Each demodulator  254  may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols. A MIMO detector  256  may obtain received symbols from all R demodulators  254   a  through  254   r , perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor  258  may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE  120  to a data sink  260 , and provide decoded control information and system information to a controller/processor  280 . A channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), and/or the like. In some aspects, one or more components of UE  120  may be included in a housing. 
     On the uplink, at UE  120 , a transmit processor  264  may receive and process data from a data source  262  and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor  280 . Transmit processor  264  may also generate reference symbols for one or more reference signals. The symbols from transmit processor  264  may be precoded by a TX MIMO processor  266  if applicable, further processed by modulators  254   a  through  254   r  (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to base station  110 . At base station  110 , the uplink signals from UE  120  and other UEs may be received by antennas  234 , processed by demodulators  232 , detected by a MIMO detector  236  if applicable, and further processed by a receive processor  238  to obtain decoded data and control information sent by UE  120 . Receive processor  238  may provide the decoded data to a data sink  239  and the decoded control information to controller/processor  240 . Base station  110  may include communication unit  244  and communicate to network controller  130  via communication unit  244 . Network controller  130  may include communication unit  294 , controller/processor  290 , and memory  292 . 
     Controller/processor  240  of base station  110 , controller/processor  280  of UE  120 , and/or any other component(s) of  FIG.  2    may perform one or more techniques associated with handling scheduling conflicts between access link communications and sidelink communications, as described in more detail elsewhere herein. For example, controller/processor  240  of base station  110 , controller/processor  280  of UE  120 , and/or any other component(s) of  FIG.  2    may perform or direct operations of, for example, process  800  of  FIG.  8   , process  900  of  FIG.  9   , and/or other processes as described herein. Memories  242  and  282  may store data and program codes for base station  110  and UE  120 , respectively. In some aspects, memory  242  and/or memory  282  may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of the base station  110  and/or the UE  120 , may perform or direct operations of, for example, process  800  of  FIG.  8   , process  900  of  FIG.  9   , and/or other processes as described herein. A scheduler  246  may schedule UEs for data transmission on the downlink and/or uplink. 
     In some aspects, a first UE (e.g., a UE  120 ) may include means for identifying (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , identification component  1006 , and/or the like) a first set of resources for an access link communication between the first UE and a base station; means for identifying (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , identification component  1006 , and/or the like) a second set of resources for a sidelink communication between the first UE and a second UE; means for identifying (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , identification component  1006 , and/or the like) a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication; means for dropping (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , dropping component  1008 , and/or the like) at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule; and/or the like. In some aspects, such means may include one or more components of UE  120  described in connection with  FIG.  2   , such as controller/processor  280 , transmit processor  264 , TX MIMO processor  266 , MOD  254 , antenna  252 , DEMOD  254 , MIMO detector  256 , receive processor  258 , and/or the like. 
     In some aspects, base station  110  may include means for identifying (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , identification component  1106 , and/or the like) a first set of resources for an access link communication between the base station  110  and a first UE; means for identifying (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , identification component  1106 , and/or the like) a second set of resources for a sidelink communication between the first UE and a second UE; means for identifying (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , identification component  1106 , and/or the like) a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE; means for refraining from scheduling (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , scheduling component  1108 , and/or the like) at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule; and/or the like. In some aspects, such means may include one or more components of base station  110  described in connection with  FIG.  2   , such as antenna  234 , DEMOD  232 , MIMO detector  236 , receive processor  238 , controller/processor  240 , transmit processor  220 , TX MIMO processor  230 , MOD  232 , antenna  234 , and/or the like. 
     As indicated above,  FIG.  2    is provided as an example. Other examples may differ from what is described with regard to  FIG.  2   . 
       FIG.  3    is a diagram illustrating an example  300  of sidelink communications, in accordance with various aspects of the present disclosure. 
     As shown in  FIG.  3   , a first UE  305 - 1  may communicate with a second UE  305 - 2  (and one or more other UEs  305 ) using device-to-device (D2D) communications via one or more sidelink channels  310 . In some aspects, the UEs  305  may correspond to one or more other UEs described elsewhere herein, such as UE  120  and/or the like. In some aspects, the sidelink channel  310  may use a PC5 interface and/or may operate in a high frequency band (e.g., the 5.9 GHz band). Additionally, or alternatively, the UEs  305  may synchronize timing of transmission time intervals (TTIs) (e.g., frames, subframes, slots, symbols, and/or the like) using global navigation satellite system (GNSS) timing. 
     As further shown in  FIG.  3   , the sidelink channel  310  may include a physical sidelink control channel (PSCCH)  315 , a physical sidelink shared channel (PSSCH)  320 , and/or a physical sidelink feedback channel (PSFCH)  325 . The PSCCH  315  may be used to communicate control information, similar to a physical downlink control channel (PDCCH) and/or a physical uplink control channel (PUCCH) used for communications with a base station  110  via an access link or an access channel. The PSSCH  320  may be used to communicate data, similar to a physical downlink shared channel (PDSCH) and/or a physical uplink shared channel (PUSCH) used for communications with a base station  110  via an access link or an access channel. For example, the PSCCH  315  may carry sidelink control information (SCI)  330 , which may indicate various control information used for sidelink communications, such as one or more resources (e.g., time resources, frequency resources, spatial resources, and/or the like) where a transport block (TB)  335  that includes data is carried on the PSSCH  320 . The TB  335  may include data. The PSFCH  325  may be used to communicate sidelink feedback  340 , such as hybrid automatic repeat request (HARD) feedback (e.g., acknowledgement or negative acknowledgement (ACK/NACK) information), transmit power control (TPC), channel state information (CSI), a scheduling request (SR), and/or the like. 
     In some aspects, the sidelink channel  310  may use resource pools. For example, a scheduling assignment (e.g., included in SCI  330 ) may be transmitted in sub-channels using specific resource blocks (RBs) across time. In some aspects, data transmissions (e.g., on the PSSCH  320 ) associated with a scheduling assignment may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, a scheduling assignment and associated data transmissions are not transmitted on adjacent RBs. 
     In some aspects, a UE  305  may operate using a transmission mode where resource selection and/or scheduling is performed by the UE  305  (e.g., rather than a base station  110 ). In some aspects, the UE  305  may perform resource selection and/or scheduling by sensing channel availability for transmissions. For example, the UE  305  may measure a received signal strength indicator (RSSI) parameter (e.g., a sidelink-RSSI (S-RSSI) parameter) associated with various sidelink channels, may measure a reference signal received power (RSRP) parameter (e.g., a PSSCH-RSRP parameter) associated with various sidelink channels, may measure a reference signal received quality (RSRQ) parameter (e.g., a PSSCH-RSRQ parameter) associated with various sidelink channels, and/or the like, and may select a channel for transmission of a sidelink communication based at least in part on the measurement(s). 
     Additionally, or alternatively, the UE  305  may perform resource selection and/or scheduling using SCI  330  received in the PSCCH  315 , which may indicate occupied resources, channel parameters, and/or the like. Additionally, or alternatively, the UE  305  may perform resource selection and/or scheduling by determining a channel busy rate (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE  305  can use for a particular set of subframes). 
     In the transmission mode where resource selection and/or scheduling is performed by a UE  305 , the UE  305  may generate sidelink grants, and may transmit the grants in SCI  330 . A sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks to be used for the upcoming sidelink transmission on the PSSCH  320  (e.g., for TBs  335 ), one or more subframes to be used for the upcoming sidelink transmission, a modulation and coding scheme (MCS) to be used for the upcoming sidelink transmission, and/or the like. In some aspects, a UE  305  may generate a sidelink grant that indicates one or more parameters for semi-persistent scheduling (SPS), such as a periodicity of a sidelink transmission. Additionally, or alternatively, the UE  305  may generate a sidelink grant for event-driven scheduling, such as for an on-demand sidelink message. 
     As indicated above,  FIG.  3    is provided as an example. Other examples may differ from what is described with respect to  FIG.  3   . 
       FIG.  4    is a diagram illustrating an example  400  of sidelink communications and access link communications, in accordance with various aspects of the present disclosure. 
     As shown in  FIG.  4   , a transmitter (Tx) UE  405  and a receiver (Rx) UE  410  may communicate with one another via a sidelink, as described above in connection with  FIG.  3   . As further shown, a base station  110  may communicate with the Tx UE  405  via a first access link. Additionally, or alternatively, the base station  110  may communicate with the Rx UE  410  via a second access link. The Tx UE  405  and/or the Rx UE  410  may correspond to one or more UEs described elsewhere herein, such as the UE  120  of  FIG.  1   . Thus, “sidelink” may refer to a direct link between UEs  120 , and “access link” may refer to a direct link between a base station  110  and a UE  120 . Sidelink communications may be transmitted via the sidelink and access link communications may be transmitted via the access link. An access link communication may be either a downlink communication (from a base station  110  to a UE  120 ) or an uplink communication (from a UE  120  to a base station  110 ). 
     A UE  120  may support various capabilities for communicating via an access link. For example, the UE  120  may be capable of communicating up to a maximum data rate on the access link, may be capable of communicating using up to a maximum bandwidth on the access link, and/or the like. The UE  120  may indicate such capabilities to a base station  110  using a UE capability report (e.g., as part of a radio resource control (RRC) configuration procedure). The base station  110  may use the indicated UE capabilities to schedule, generate, and/or encode communications for the UE  120 , such as by sending grants and/or other communications that conform with the indicated UE capabilities. In some cases, if a grant does not conform with the capabilities of a UE  120  (e.g., if the grant schedules a communication that does not conform with the capabilities of the UE  120 ), then the UE  120  may ignore the grant and/or a corresponding communication scheduled by the grant. 
     Similarly, a UE  120  may support various capabilities for communicating via a sidelink. For example, the UE  120  may be capable of communicating up to a maximum data rate on the sidelink, may be capable of communicating using up to a maximum bandwidth on the sidelink, and/or the like. The UE  120  may also support a joint capability for access link communications and sidelink communications in the same resources (e.g., the same time domain resources). In some cases, a joint capability may be different from a corresponding capability for either the access link or the sidelink. For example, because processing communications on two separate links (e.g., an access link and a sidelink) requires additional overhead as compared to processing a communication on a single link, a joint maximum data rate for the access link and the sidelink may be less than an individual maximum data rate for the access link and/or an individual maximum data rate for the sidelink. 
     In some sidelink communication modes, such as an autonomous scheduling mode where resource selection and/or scheduling is performed by a UE  120  (e.g., which may include transmission mode  2  and/or transmission mode  4 ), a base station  110  may not receive information regarding sidelink communications between UEs  120 . As a result, the base station  110  may transmit a grant and/or schedule a communication that conforms to an access link capability of a UE  120 , but that violates a joint access link and sidelink capability of the UE  120 . For example, the base station  110  may schedule a communication using a data rate that is less than or equal to a maximum data rate supported by the UE  120  for access link communications, but that is greater than a joint maximum data rate supported by the UE  120  for joint access link communications and sidelink communications (e.g., scheduled in the same slot). In this case, the UE  120  may be incapable of receiving both an access link communication and a sidelink communication that are scheduled in the same resources, may ignore the grant from the base station  110 , and/or the like. As a result, latency may be increased, reliability may be reduced, performance may be degraded, network resources may be wasted (e.g., for retransmission of a failed communication), and/or resources of the base station  110  and/or the UE  120  (e.g., processing resources, memory resources, battery power, and/or the like) may be wasted (e.g., for handling retransmissions). 
     Some techniques and apparatuses described herein permit conformance with access link capabilities, sidelink capabilities, and/or joint capabilities. Furthermore, some techniques and apparatuses described herein provide mechanisms for handling scheduling conflicts or potential scheduling conflicts between access link communications and sidelink communications to avoid violating a UE capability. In this way, latency may be reduced, reliability may be increased, performance may be improved, network resources may be conserved, and/or resources of the base station  110  and/or the UE  120  may be conserved. 
     As indicated above,  FIG.  4    is provided as an example. Other examples may differ from what is described with respect to  FIG.  4   . 
       FIG.  5    is a diagram illustrating an example  500  of handling scheduling conflicts between access link communications and sidelink communications, in accordance with various aspects of the present disclosure. 
     As shown in  FIG.  5   , a Tx UE  405  and an Rx UE  410  may communicate with one another via a sidelink, and the Rx UE  410  may communicate with a base station  110  via an access link. The Tx UE  405  and/or the Rx UE  410  may correspond to one or more UEs described elsewhere herein, such as the UE  120  of  FIG.  1   , the UE  305 - 1  of  FIG.  3   , the UE  305 - 2  of  FIG.  3   , and/or the like. 
     As shown by reference number  505 , the Rx UE  410  may identify a first set of resources for an access link communication between the Rx UE  410  and the base station  110 . For example, the first set of resources may be indicated in a radio resource control (RRC) message from the base station  110  (e.g., for semi-statically scheduled resources, such as for semi-persistent scheduling (SPS), configured grants (CGs), PDCCH communications, and/or the like), may be indicated in downlink control information (DCI) from the base station  110  (e.g., for communications scheduled via a PDCCH, for PDSCH communications, and/or the like), and/or the like. The first set of resources may include one or more resources (e.g., time domain resources, frequency domain resources, spatial domain resources, and/or the like) to be used for an access link communication on the access link. The access link communication between the Rx UE  410  and the base station  110  may include an uplink communication or a downlink communication. 
     As shown by reference number  510 , the Rx UE  410  may identify a second set of resources for a sidelink communication between the Tx UE  405  and the Rx UE  410 . For example, the second set of resources may be indicated in sidelink control information (SCI) from the Tx UE  405  (e.g., for communications scheduled via a PSCCH). The second set of resources may include one or more resources (e.g., time domain resources, frequency domain resources, spatial domain resources, and/or the like) to be used for a sidelink communication on the sidelink. In some aspects, the second set of resources may exclude one or more resources to be used by the Rx UE  410  for discontinuous reception (DRX) and/or sidelink communication skipping (e.g., one or more resources for which the Rx UE  410  indicates that the Rx UE  410  will not monitor). As shown, the sidelink communication between the Tx UE  405  and the Rx UE  410  may include a transmission from the Tx UE  405  to the Rx UE  410 . 
     As shown by reference number  515 , the Rx UE  410  may identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication. In example  500 , slots 2, 3, and 4 are included in the first set of resources for the access link communication, and slots 0, 1, 2, and 3 are included in the second set of resources for the sidelink communication. In this example, the Rx UE  410  identifies a scheduling conflict in slots 2 and 3 because the access link communication and the sidelink communication are both scheduled in slots 2 and 3 (e.g., slots 2 and 3 are included in both the first set of resources and the second set of resources). In some cases, access link communications and/or sidelink communications may be scheduled in a subset of time resources (e.g., OFDM symbols) within a slot. In these cases, a scheduling conflict may occur for a slot if a first subset of time resources scheduled for an access link communication in the slot overlaps in time with a second subset of time resources scheduled for a sidelink communication in the slot. 
     In some aspects, the access link communication is a PDCCH communication or a PUCCH communication. In this case, the Rx UE  410  may identify the scheduling conflict based at least in part on an RRC message, which may configure resources for the PDCCH and/or the PUCCH. In some aspects, the access link communication is a PDSCH communication or a PUSCH communication. In this case, the Rx UE  410  may identify the scheduling conflict based at least in part on DCI (or an RRC message for SPS or CG), which may schedule resources for the PDSCH and/or the PUSCH. In some aspects, the access link communication is a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), or another type of reference signal. In this case, the Rx UE  410  may identify the scheduling conflict based at least in part on a message that schedules the access link communication (e.g., the reference signal), such as an RRC message, a medium access control (MAC) control element (CE) (MAC-CE), DCI, and/or the like. In some aspects, the sidelink communication is a PSCCH communication. In this case, the Rx UE  410  may identify the scheduling conflict based at least in part on an RRC message, which may indicate a set of monitoring occasions (e.g., resources) for the PSCCH. In some aspects, the sidelink communication is a PSSCH. In this case, the Rx UE  410  may identify the scheduling conflict based at least in part on SCI, which may schedule resources for the PSSCH (e.g., from a set of possible locations configured in an RRC message). 
     As shown by reference number  520 , the Rx UE  410  may drop at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. The prioritization rule may indicate whether to prioritize access link communications over sidelink communications or whether to prioritize sidelink communications over access link communications. In some aspects, the prioritization rule may differ for different conditions (e.g., different sidelink channel conditions, different access link channel conditions, different quality of services (QoS) requirements associated with an access link communication and/or a sidelink communication, whether the access link communication and/or the sidelink communication carries data or control information, a type of control information carried in the access link communication and/or the sidelink communication, and/or the like). 
     In example  500 , the prioritization rule indicates that access link communications have a higher priority than sidelink communications. In this case, the Rx UE  410  may drop the sidelink communication in slots that are subject to the scheduling conflict. Thus, as shown by reference number  525 , the Rx UE  410  may drop the sidelink communication in slots 2 and 3, and may monitor for and/or receive the access link communication (shown as AL) from the base station  110  in slots 2 and 3. In some aspects, the Rx UE  410  may drop a portion of the resources in the second set of resources for the sidelink communication, such as by dropping the sidelink communication in slots 2 and 3 and monitoring for and/or receiving the sidelink communication in slots 0 and 1 (e.g., with a possibility to still be able to decode the sidelink communication). In some aspects, the Rx UE  410  may drop all of the resources in the second set of resources, such as by dropping the sidelink communication in slots 0, 1, 2, and 3. 
     In some aspects, the Rx UE  410  may determine whether to drop one or more conflicting resources based at least in part on a capability of the Rx UE  410 . For example, if the Rx UE  410  is capable of receiving both the access link communication and the sidelink communication in the conflicting resources (e.g., because an access link capability, a sidelink capability, and a joint capability of the Rx UE  410  are not violated in the conflicting resources), then the Rx UE  410  may receive both the sidelink communication and the access link communication in the conflicting resources. However, if the Rx UE  410  is not capable of receiving both the access link communication and the sidelink communication in the conflicting resources (e.g., because at least one of an access link capability, a sidelink capability, or a joint capability of the Rx UE  410  is violated in the conflicting resources), then the Rx UE  410  may drop either the sidelink communication or the access link communication in the conflicting resources based at least in part on the prioritization rule. 
     In some aspects, the capability of the Rx UE  410  may include a maximum bandwidth, a maximum data rate, and/or a maximum rank supported by the Rx UE  410  for access link communication, sidelink communications, and/or joint communications (e.g., joint communications where access link and sidelink communications are scheduled in a same set of resources). Additionally, or alternatively, the capability of the Rx UE  410  may include whether the Rx UE  410  is capable of communicating using multiple beams (e.g., a first beam for access link communications and a second beam for sidelink communications). Additionally, or alternatively, the capability of the Rx UE  410  may include whether the Rx UE  410  is capable of communicating in a half duplex mode (e.g., permitting only transmission or reception, and not both, at a point in time) or a full duplex mode (e.g., permitting concurrent transmission and reception at a point in time). 
     In some aspects, the Rx UE  410  may communicate with multiple UEs  120  using sidelink communications. In this case, the prioritization rule may indicate one or more sidelink communications to be dropped and/or one or more sidelink communications to be maintained (e.g., transmitted or received) when a scheduling conflict occurs. For example, a resource may be scheduled for an access link communication, a high priority sidelink communication with a first UE  120 , and a low priority sidelink communication with a second UE  120 . If the Rx UE  410  is capable of simultaneous communication of two of these communications, then the Rx UE  410  may drop the low priority sidelink communication in the resource and may transmit or receive the high priority sidelink communication (as well as the access link communication) in the resource. Thus, if there are multiple sidelink communications scheduled for a UE  120  (e.g., an Rx UE  410  and/or a Tx UE  405 ) in a set of conflicting resources, then the UE  120  may drop a subset of the sidelink communications in the set of conflicting resources based at least in part on a UE capability. 
     In some aspects, the Rx UE  410  may transmit a negative acknowledgment (NACK) based at least in part on dropping a communication. For example, the Rx UE  410  may be scheduled to receive a sidelink transmission from the Tx UE  405 , and the Rx UE  410  may drop the sidelink transmission due to a scheduling conflict with an access link communication. Based at least in part on dropping the sidelink transmission, the Rx UE  410  may transmit a NACK, to the Tx UE  405 , corresponding to the dropped sidelink transmission. In some aspects, the Rx UE  410  may also transmit an indication that the NACK is due to the scheduling conflict. In this case, because the NACK is due to the scheduling conflict and not due to poor channel conditions, the Tx UE  405  may refrain from counting the NACK for a procedure that modifies transmissions due to poor channel conditions. 
     By dropping one or more communications in conflicting resources, the Rx UE  410  may avoid violating a UE capability, such as an access link capability, a sidelink capability, and/or a joint capability. Furthermore, by dropping according to a prioritization rule, the Rx UE  410  may ensure that higher priority communications are transmitted or received in the conflicting resources. In this way, latency, reliability, and/or performance may be improved for the higher priority communications. 
     As indicated above,  FIG.  5    is provided as an example. Other examples may differ from what is described with respect to  FIG.  5   . 
       FIG.  6    is a diagram illustrating another example  600  of handling scheduling conflicts between access link communications and sidelink communications, in accordance with various aspects of the present disclosure. 
     As shown in  FIG.  6   , a Tx UE  405  and an Rx UE  410  may communicate with one another via a sidelink, and the Tx UE  405  may communicate with a base station  110  via an access link. As indicated above in connection with  FIG.  5   , the Tx UE  405  and/or the Rx UE  410  may correspond to one or more UEs described elsewhere herein, such as the UE  120  of  FIG.  1   , the UE  305 - 1  of  FIG.  3   , the UE  305 - 2  of  FIG.  3   , and/or the like. 
     As shown by reference number  605 , the Tx UE  405  may identify a first set of resources for an access link communication between the Tx UE  405  and the base station  110 . As described above in connection with  FIG.  5   , the first set of resources may be indicated in an RRC message from the base station  110 , may be indicated in DCI from the base station  110 , and/or the like. The first set of resources may include one or more resources (e.g., time domain resources, frequency domain resources, spatial domain resources, and/or the like) to be used for an access link communication on the access link. The access link communication between the Tx UE  405  and the base station  110  may include an uplink communication or a downlink communication. 
     As shown by reference number  610 , the Tx UE  405  may identify a second set of resources for a sidelink communication between the Tx UE  405  and the Rx UE  410 . For example, the second set of resources may be indicated in SCI transmitted by the Tx UE  405  to the Rx UE  410 . The second set of resources may include one or more resources (e.g., time domain resources, frequency domain resources, spatial domain resources, and/or the like) to be used for a sidelink communication on the sidelink. In some aspects, the second set of resources may exclude one or more resources to be used by the Rx UE  410  for DRX and/or sidelink communication skipping. As shown, the sidelink communication between the Tx UE  405  and the Rx UE  410  may include a transmission from the Tx UE  405  to the Rx UE  410 . 
     As shown by reference number  615 , the Tx UE  405  may identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication. In example  600 , slots 2, 3, and 4 are included in the first set of resources for the access link communication, and slots 0, 1, 2, and 3 are included in the second set of resources for the sidelink communication. In this example, the Tx UE  405  identifies a scheduling conflict in slots 2 and 3 because the access link communication and the sidelink communication are both scheduled in slots 2 and 3 (e.g., slots 2 and 3 are included in both the first set of resources and the second set of resources). 
     In some aspects, the access link communication is a PDCCH communication or a PUCCH communication. In this case, the Tx UE  405  may identify the scheduling conflict based at least in part on an RRC message, which may configure resources for the PDCCH and/or the PUCCH. In some aspects, the access link communication is a PDSCH communication or a PUSCH communication. In this case, the Tx UE  405  may identify the scheduling conflict based at least in part on DCI, which may schedule resources for the PDSCH and/or the PUSCH. In some aspects, the access link communication is a CSI-RS, an SRS, or another type of reference signal. In this case, the Tx UE  405  may identify the scheduling conflict based at least in part on a message that schedules the access link communication (e.g., the reference signal), such as an RRC message, a MAC-CE, DCI, and/or the like. In some aspects, the sidelink communication is a PSCCH communication. In this case, the Tx UE  405  may identify the scheduling conflict based at least in part on an RRC message, which may indicate a set of monitoring occasions and/or transmission occasions (e.g., resources) for the PSCCH. In some aspects, the sidelink communication is a PSSCH. In this case, the Tx UE  405  may identify the scheduling conflict based at least in part on SCI, which may schedule resources for the PSSCH (e.g., from a set of possible locations configured in an RRC message). 
     As shown by reference number  620 , the Tx UE  405  may drop at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. The prioritization rule may indicate whether to prioritize access link communications over sidelink communications or whether to prioritize sidelink communications over access link communications. In some aspects, the prioritization rule may differ for different conditions (e.g., different sidelink channel conditions, different access link channel conditions, different QoS requirements associated with an access link communication and/or a sidelink communication, whether the access link communication and/or the sidelink communication carries data or control information, a type of control information carried in the access link communication and/or the sidelink communication, and/or the like). 
     In example  600 , the prioritization rule indicates that access link communications have a higher priority than sidelink communications. In this case, the Tx UE  405  may drop the sidelink communication in slots that are subject to the scheduling conflict. Thus, as shown by reference number  625 , the Tx UE  405  may drop the sidelink communication in slots 2 and 3. As shown by reference number  630 , the Tx UE  405  may monitor for and/or receive the access link communication (shown as AL) from the base station  110  in slots 2 and 3. In some aspects, the Tx UE  405  may drop a portion of the resources in the second set of resources for the sidelink communication, such as by dropping the sidelink communication in slots 2 and 3 and transmitting the sidelink communication in slots 0 and 1, as shown by reference number  635 . In some aspects, the Tx UE  405  may drop all of the resources in the second set of resources, such as by dropping (e.g., refraining from transmitting) the sidelink communication in slots 0, 1, 2, and 3. 
     In some aspects, the Tx UE  405  may determine whether to drop one or more conflicting resources based at least in part on a capability of the Tx UE  405 . For example, if the Tx UE  405  is capable of transmitting the sidelink communication and transmitting or receiving the access link communication in the conflicting resources (e.g., because an access link capability, a sidelink capability, and a joint capability of the Tx UE  405  are not violated in the conflicting resources), then the Tx UE  405  may transmit the sidelink communication and may transmit or receive the access link communication in the conflicting resources. However, if the Tx UE  405  does not have this capability (e.g., because at least one of an access link capability, a sidelink capability, or a joint capability of the Tx UE  405  is violated in the conflicting resources), then the Tx UE  405  may drop either the sidelink communication or the access link communication in the conflicting resources based at least in part on the prioritization rule. 
     In some aspects, the capability of the Tx UE  405  may include a maximum bandwidth, a maximum data rate, and/or a maximum rank supported by the Tx UE  405  for access link communication, sidelink communications, and/or joint communications (e.g., joint communications where access link and sidelink communications are scheduled in a same set of resources). Additionally, or alternatively, the capability of the Tx UE  405  may include whether the Tx UE  405  is capable of communicating using multiple beams (e.g., a first beam for access link communications and a second beam for sidelink communications). Additionally, or alternatively, the capability of the Tx UE  405  may include whether the Tx UE  405  is capable of communicating in a half duplex mode (e.g., permitting only transmission or reception, and not both, on an antenna at a point in time) or a full duplex mode (e.g., permitting concurrent transmission and reception on an antenna at a point in time). 
     In some aspects, the Tx UE  405  may communicate with multiple UEs  120  using sidelink communications. In this case, the prioritization rule may indicate one or more sidelink communications to be dropped and/or one or more sidelink communications to be maintained (e.g., transmitted or received) when a scheduling conflict occurs. For example, a resource may be scheduled for an access link communication, a high priority sidelink communication with a first UE  120 , and a low priority sidelink communication with a second UE  120 . If the Tx UE  405  is capable of simultaneous communication of two of these communications, then the Tx UE  405  may drop the low priority sidelink communication in the resource and may transmit or receive the high priority sidelink communication (as well as the access link communication) in the resource. Thus, if there are multiple sidelink communications scheduled for a UE  120  (e.g., an Rx UE  410  and/or a Tx UE  405 ) in a set of conflicting resources, then the UE  120  may drop a subset of the sidelink communications in the set of conflicting resources based at least in part on a UE capability. 
     In some aspects, a sidelink transmission scheduled by the Tx UE  405  may be part of a group of transmissions, such as a data burst. In this case, if the Tx UE  405  drops a threshold number of transmissions included in the group of transmissions (e.g., one transmission, two transmissions, or the like), then the Tx UE  405  may drop the entire group of transmissions (or any remaining transmissions, in the group of transmissions, that have not yet been transmitted), thereby conserving network resources when the group of communications has a low likelihood of being successfully decoded by the Rx UE  410 . Additionally, or alternatively, the Tx UE  405  may transmit an indication, to the Rx UE  410 , that the group of transmissions has been dropped. In some aspects, if the base station  110  determines and/or receives an indication (e.g., from the Tx UE  405 ), that the group of transmissions is to be dropped, then the base station  110  may transmit an indication, to the Rx UE  410 , that the group of transmissions has been dropped. Based at least in part on receiving this indication, the Rx UE  410  may refrain from monitoring for the transmissions included in the group of transmissions, thereby conserving resources of the Rx UE  410  (e.g., processing resources, memory resources, and/or the like). 
     In some aspects, if the Tx UE  405  drops a transmission scheduled for the Rx UE  410 , then the Rx UE  410  may transmit a NACK corresponding to the dropped transmission because the Rx UE  410  will not receive the dropped transmission. In this case, because the NACK is due to the scheduling conflict (e.g., the dropped transmission) and not due to poor channel conditions, the Tx UE  405  may refrain from counting the NACK for a procedure that modifies transmissions due to poor channel conditions. 
     By dropping one or more communications in conflicting resources, the Tx UE  405  may avoid violating a UE capability, such as an access link capability, a sidelink capability, and/or a joint capability. Furthermore, by dropping according to a prioritization rule, the Tx UE  405  may ensure that higher priority communications are transmitted or received in the conflicting resources. In this way, latency, reliability, and/or performance may be improved for the higher priority communications. 
     In some aspects, a prioritization rule described herein may be defined solely for the access link (e.g., for different types of access link communications) to prioritize different types of traffic flows over the access link, such as by prioritizing ultra-reliable low latency communication (URLLC) traffic over enhanced mobile broadband (eMBB) traffic. Additionally, or alternatively, the same or similar rules may be applied to prioritize a set of traffic flows over a set of sidelinks and access links. For communications over only the access link, the prioritization rules may be less complex because all of the traffic flows may be scheduled by a common entity, such as a base station  110 , which may thus be aware of all of prioritization. When sidelink communications are also involved in such prioritization, some of the scheduling may occur at a UE  120 , which may require some additional signaling, such as to inform a receiver about the transmit prioritization, or to inform a transmitter about the receiver prioritization. 
     As indicated above,  FIG.  6    is provided as an example. Other examples may differ from what is described with respect to  FIG.  6   . 
       FIG.  7    is a diagram illustrating another example  700  of handling scheduling conflicts between access link communications and sidelink communications, in accordance with various aspects of the present disclosure. 
     As shown in  FIG.  7   , a base station  110  may communicate with a Tx UE  405  and/or an Rx UE  410  via respective access links, and the Tx UE  405  and the Rx UE  410  may communicate with one another via a sidelink. As indicated above in connection with  FIG.  5   , the Tx UE  405  and/or the Rx UE  410  may correspond to one or more UEs described elsewhere herein, such as the UE  120  of  FIG.  1   , the UE  305 - 1  of  FIG.  3   , the UE  305 - 2  of  FIG.  3   , and/or the like. 
     As shown by reference number  705 , the base station  110  may receive a report indicating a UE capability of a UE  120 . For example, the base station  110  may receive a capability report for the Tx UE  405 , may receive a capability report for the Rx UE  410 , and/or the like. A capability indicated in the capability report may include one or more capabilities described above in connection with  FIGS.  5  and  6   . 
     As shown by reference number  710 , the base station  110  may identify a scheduling conflict between an access link communication and a sidelink communication. For example, the base station  110  may identify a first set of resources for an access link communication between the base station  110  and a first UE  120  (e.g., one of the Tx UE  405  or the Rx UE  410 ), may identify a second set of resources for a sidelink communication between the first UE  120  and a second UE  120  (e.g., one of the Tx UE  405  or the Rx UE  410 ), and may identify a scheduling conflict between the first set of resources and the second set of resources, in a similar manner as described above in connection with  FIGS.  5  and  6   . In some aspects, the base station  110  may identify the scheduling conflict based at least in part on a capability of the first UE  120 , in a similar manner as described above. 
     In some aspects, the base station  110  may identify the first set of resources for the access link communication with the first UE  120  based at least in part on a configuration for the UE  120  (e.g., transmitted in an RRC message to the first UE  120 ), such as when the access link communication is a PDCCH communication, a PUCCH communication, an SPS communication, a CG communication, and/or the like. Additionally, or alternatively, the base station  110  may identify the first set of resources for the access link communication with the first UE  120  based at least in part on scheduling information for the first UE  120  (e.g., transmitted in DCI for the first UE  120 ), such as when the access link communication is a PDSCH communication, a PUSCH communication, and/or the like. 
     In some aspects, the base station  110  may identify the second set of resources for the sidelink communication based at least in part on sidelink configuration configured for the first UE  120  (e.g., transmitted in an RRC message to the first UE  120 ). For example, the base station  110  may configure a sidelink resource pool (e.g., an Rx resource pool for sidelink reception) for the first UE  120 , which may indicate a set of resources (e.g., monitoring occasions) for the PSCCH and/or a set of possible locations of PSSCH resources. 
     Additionally, or alternatively, the base station  110  may identify the second set of resources for the sidelink communication by monitoring for SCI transmitted from the Tx UE  405  to the Rx UE  410  (e.g., by monitoring a set of configured sidelink monitoring occasions). The SCI may indicate a resource allocation for the PSSCH, which may indicate the second set of resources that may cause a scheduling conflict. In this case, a timing value indicated in the SCI for a timing between the SCI and a corresponding PSSCH communication may be configured to satisfy a threshold (e.g., to be greater than or equal to a threshold) so that the base station  110  has sufficient time to process the SCI to avoid scheduling conflicts with the PSSCH communication. 
     In some aspects, the first UE  120  and the second UE  120  are both connected to the base station  110 . In this case, the base station  110  can use a sidelink configuration and/or scheduling information determined by the base station  110  to identify the first set of resources and/or the second set of resources. However, if the base station  110  is a first base station, and if one of the UEs  120  is connected to a second base station, then the second base station may transmit (e.g., directly via a connection with the first base station or indirectly via a core network) a sidelink configuration and/or scheduling information for that UE  120  to the first base station. The first base station may use the sidelink configuration and/or the scheduling information to identify the first set of resources and/or the second set of resources, as described above. 
     In some aspects, an Rx UE  410  may transmit an indication of one or more resources in which the Rx UE  410  is to perform DRX and/or sidelink communication skipping for sidelink communications (e.g., for one or more resources in a configured sidelink resource pool). In some aspects, the Rx UE  410  may transmit this indication directly to the base station  110 . In some aspects, the base station  110  may transmit (e.g., forward, relay, and/or the like) the indication to the Tx UE  405 . Additionally, or alternatively, the Rx UE  410  may transmit this indication directly to the Tx UE  405 . In some aspects, the Tx UE  405  may transmit (e.g., forward, relay, and/or the like) the indication to the base station  110 . In some aspects, the base station  110  may configure the one or more resources for DRX and/or sidelink communication skipping, and may indicate the one or more resources to one or both of the Tx UE  405  or the Rx UE  410 . In any case, the base station  110  may use the indication to identify the second set of resources for a sidelink communication. For example, the second set of resources may exclude the one or more resources indicated by the Rx UE  410  for DRX and/or sidelink communication skipping. 
     As shown by reference number  715 , the base station  110  may schedule or may refrain from scheduling access link communication in one or more conflicting resources based at least in part on the scheduling conflict, a UE capability, and/or a prioritization rule. For example, if scheduling an access link communication in a conflicting resource would violate a UE capability, then the base station  110  may refrain from scheduling an access link communication in the conflicting resource (e.g., if the prioritization rule indicates that sidelink communications have a higher priority than access link communications). 
     In some aspects, when the base station  110  configures a sidelink resource pool for the first UE  120 , then the base station  110  may refrain from scheduling an access link communication in any of the resources included in the sidelink resource pool (e.g., PSCCH monitoring occasions and/or possible PSSCH resource locations). In this way, scheduling conflicts can be avoided. Alternatively, for more efficient network resource usage, the base station  110  may refrain from scheduling an access link communication for a UE  120  in any resources indicated in SCI that indicates a resource allocation for the UE  120 . 
     As indicated above,  FIG.  7    is provided as an example. Other examples may differ from what is described with respect to  FIG.  7   . 
       FIG.  8    is a diagram illustrating an example process  800  performed, for example, by a first UE, in accordance with various aspects of the present disclosure. Example process  800  is an example where a first UE (e.g., UE  120 , UE  305 - 1 , UE  305 - 2 , Tx UE  405 , Rx UE  410 , and/or the like) performs operations associated with handling scheduling conflicts between access link communications and sidelink communications. 
     As shown in  FIG.  8   , in some aspects, process  800  may include identifying a first set of resources for an access link communication between the first UE and a base station (block  810 ). For example, the first UE (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , identification component  1006 , and/or the like) may identify a first set of resources for an access link communication between the first UE and a base station, as described above. 
     As further shown in  FIG.  8   , in some aspects, process  800  may include identifying a second set of resources for a sidelink communication between the first UE and a second UE (block  820 ). For example, the first UE (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , identification component  1006 , and/or the like) may identify a second set of resources for a sidelink communication between the first UE and a second UE, as described above. 
     As further shown in  FIG.  8   , in some aspects, process  800  may include identifying a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication (block  830 ). For example, the first UE (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , identification component  1006 , and/or the like) may identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication, as described above. 
     As further shown in  FIG.  8   , in some aspects, process  800  may include dropping at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule (block  840 ). For example, the first UE (e.g., using receive processor  258 , transmit processor  264 , controller/processor  280 , memory  282 , dropping component  1008 , and/or the like) may drop at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule, as described above. 
     Process  800  may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first aspect, the prioritization rule indicates that access link communications have a higher priority than sidelink communications. 
     In a second aspect, alone or in combination with the first aspect, the dropping comprises dropping at least a portion of the second set of resources for the sidelink communication based at least in part on the prioritization rule. 
     In a third aspect, alone or in combination with one or more of the first and second aspects, the dropping is further based at least in part on a capability of the first UE. 
     In a fourth aspect, alone or in combination with one or more of the first through third aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the dropping comprises dropping a subset of sidelink communications scheduled for the first UE to permit the first UE to receive the access link communication. 
     In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the sidelink communication is a transmission from the second UE to the first UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process  800  includes transmitting (e.g., using transmit processor  264 , controller/processor  280 , memory  282 , transmission component  1010 , and/or the like) a negative acknowledgement (NACK) corresponding to the transmissions, and the NACK is transmitted in connection with an indication that the NACK is due to the scheduling conflict. 
     In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, process  800  includes receiving (e.g., using receive processor  258 , controller/processor  280 , memory  282 , reception component  1004 , and/or the like) an indication that multiple transmissions, including the transmission, have been dropped; and refraining from monitoring for (e.g., using receive processor  258 , controller/processor  280 , memory  282 , reception component  1004 , and/or the like) the multiple transmissions based at least in part on the indication. 
     In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the indication that the multiple transmissions have been dropped is received from at least one of the base station or the second UE. 
     In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the sidelink communication is a transmission from the first UE to the second UE, and the access link communication is one of an uplink communication or a downlink communication. 
     In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the transmission is dropped and a NACK corresponding to the transmission is not counted, for a procedure that modifies transmissions due to poor channel conditions, based at least in part on dropping the transmission. 
     In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the transmission is dropped, and process  800  includes transmitting (e.g., using transmit processor  264 , controller/processor  280 , memory  282 , transmission component  1010 , and/or the like) an indication to the second UE that multiple transmissions, including the transmission, have been dropped. 
     In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the sidelink communication is a physical sidelink control channel communication and the access link communication is one of a physical downlink control channel communication or a physical uplink control channel communication, and the scheduling conflict is identified based at least in part on a radio resource control message. 
     In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the sidelink communication is a physical sidelink shared channel communication and the access link communication is one of a physical downlink shared channel communication or a physical uplink shared channel communication, and the scheduling conflict is identified based at least in part on at least one of sidelink control information or downlink control information. 
     In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In a sixteenth aspect, alone or in combination with one or more of the first through fifteenth aspects, process  800  includes transmitting (e.g., using transmit processor  264 , controller/processor  280 , memory  282 , transmission component  1010 , and/or the like) an indication of the one or more resources to at least one of the base station or the second UE. 
     In a seventeenth aspect, alone or in combination with one or more of the first through sixteenth aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     Although  FIG.  8    shows example blocks of process  800 , in some aspects, process  800  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG.  8   . Additionally, or alternatively, two or more of the blocks of process  800  may be performed in parallel. 
       FIG.  9    is a diagram illustrating an example process  900  performed, for example, by a base station, in accordance with various aspects of the present disclosure. Example process  900  is an example where a base station (e.g., base station  110  and/or the like) performs operations associated with handling scheduling conflicts between access link communications and sidelink communications. 
     As shown in  FIG.  9   , in some aspects, process  900  may include identifying a first set of resources for an access link communication between the base station and a first UE (block  910 ). For example, the base station (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , identification component  1106 , and/or the like) may identify a first set of resources for an access link communication between the base station and a first UE, as described above. 
     As further shown in  FIG.  9   , in some aspects, process  900  may include identifying a second set of resources for a sidelink communication between the first UE and a second UE (block  920 ). For example, the base station (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , identification component  1106 , and/or the like) may identify a second set of resources for a sidelink communication between the first UE and a second UE, as described above. 
     As further shown in  FIG.  9   , in some aspects, process  900  may include identifying a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE (block  930 ). For example, the base station (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , identification component  1106 , and/or the like) may identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication based at least in part on a capability of the first UE, as described above. 
     As further shown in  FIG.  9   , in some aspects, process  900  may include refraining from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule (block  940 ). For example, the base station (e.g., using transmit processor  220 , receive processor  238 , controller/processor  240 , memory  242 , scheduler  246 , scheduling component  1108 , and/or the like) may refrain from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule, as described above. 
     Process  900  may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein. 
     In a first aspect, the second set of resources is identified based at least in part on a sidelink resource pool configured by the base station for the first UE. 
     In a second aspect, alone or in combination with the first aspect, the sidelink resource pool is for sidelink reception. 
     In a third aspect, alone or in combination with one or more of the first and second aspects, refraining from scheduling at least a portion of the first set of resources comprises refraining from scheduling the access link communication in any resource included in the sidelink resource pool. 
     In a fourth aspect, alone or in combination with one or more of the first through third aspects, the capability indicates at least one of: a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for access link communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for sidelink communications; a maximum bandwidth, a maximum data rate, or a maximum rank supported by the first UE for joint access link and sidelink communications scheduled in a same set of resources; whether the first UE is capable of communicating using multiple beams; whether the first UE is capable of communicating in a half duplex mode or a full duplex mode; or a combination thereof. 
     In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the second set of resources is identified from SCI transmitted from the second UE to the first UE. 
     In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, a timing value, indicated in the SCI for timing between the SCI and a corresponding sidelink data communication, satisfies a threshold. 
     In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the first UE and the second UE are connected to the base station. 
     In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the first UE is connected to the base station and the second UE is connected to another base station, and the base station is configured to receive a sidelink configuration of the second UE directly or indirectly from the other base station. 
     In a ninth aspect, alone or in combination with one or more of the first through eighth aspects, the second set of resources is identified based at least in part on one or more resources in which the first UE is to perform discontinuous reception or sidelink communication skipping for sidelink communications. 
     In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the one or more resources are indicated in a message received from at least one of the first UE or the second UE. 
     In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the message is received from the first UE and the base station is configured to relay the message to the second UE. 
     In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the one or more resources are configured by the base station and indicated to at least one of the first UE or the second UE. 
     In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the capability indicates whether the first UE is capable of transmitting or receiving multiple communications scheduled in a same set of resources. 
     Although  FIG.  9    shows example blocks of process  900 , in some aspects, process  900  may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in  FIG.  9   . Additionally, or alternatively, two or more of the blocks of process  900  may be performed in parallel. 
       FIG.  10    is a conceptual data flow diagram  1000  illustrating a data flow between different modules/means/components in an example apparatus  1002 . The apparatus  1002  may be a UE (e.g., UE  120 , UE  305 - 1 , UE  305 - 2 , Tx UE  405 , Rx UE  410 , and/or the like). In some aspects, the apparatus  1002  includes a reception component  1004 , an identification component  1006 , a dropping component  1008 , and/or a transmission component  1010 . 
     The identification component  1006  may identify a first set of resources for an access link communication between the apparatus  1002  (e.g., a first UE) and an apparatus  1050  (e.g., a base station) and/or may identify a second set of resources for a sidelink communication between the apparatus  1002  and another apparatus  1055  (e.g., a second UE). For example, the identification component  1006  may receive information  1012  from the reception component (which may receive information  1014  from the apparatus  1050  and/or the apparatus  1055 ), and may use the information  1012  to identify the first set of resources and/or the second set of resources, as described above in connection with  FIGS.  5  and  6   . The identification component  1006  may identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication, as described above in connection with  FIGS.  5  and  6   . In some aspects, the identification component  1006  may provide information  1016  associated with the scheduling conflict to the dropping component  1008 . The dropping component  1008  may use the information  1016  to drop at least a portion of the first set of resources for the access link communication or the second set of resources for the sidelink communication based at least in part on the identification of the scheduling conflict and a prioritization rule. In some aspects, the dropping component  1008  may provide information  1018  to the reception component  1004  to drop reception of a communication. Additionally, or alternatively, the dropping component  1008  may provide information  1020  to the transmission component  1010  to drop transmission of a communication. In some aspects, the transmission component  1010  may transmit information  1022  to the apparatus  1050  and/or the apparatus  1055 , as described above in connection with  FIGS.  5  and  6   . 
     The apparatus  1002  may include additional components that perform each of the blocks of the algorithm in the aforementioned process  800  of  FIG.  8    and/or the like. Each block in the aforementioned process  800  of  FIG.  8    and/or the like may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     The number and arrangement of components shown in  FIG.  10    are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in  FIG.  10   . Furthermore, two or more components shown in  FIG.  10    may be implemented within a single component, or a single component shown in  FIG.  10    may be implemented as multiple, distributed components. Additionally, or alternatively, a set of components (e.g., one or more components) shown in  FIG.  10    may perform one or more functions described as being performed by another set of components shown in  FIG.  10   . 
       FIG.  11    is a conceptual data flow diagram  1100  illustrating a data flow between different modules/means/components in an example apparatus  1102 . The apparatus  1102  may be a base station (e.g., base station  110  and/or the like). In some aspects, the apparatus  1102  includes a reception component  1104 , an identification component  1106 , a scheduling component  1108 , and/or a transmission component  1110 . 
     The identification component  1106  may identify a first set of resources for an access link communication between the apparatus  1102  (e.g., a base station) and an apparatus  1150  (e.g., a first UE), may identify a second set of resources for a sidelink communication between the apparatus  1150  and another apparatus  1155  (e.g., a second UE), and may identify a scheduling conflict between the first set of resources for the access link communication and the second set of resources for the sidelink communication, as described above in connection with  FIG.  7   . For example, the identification component  1106  may receive information  1112  from the reception component (which may receive information  1114  from the apparatus  1150  and/or the apparatus  1155 ), and may use the information  1112  to identify the scheduling conflict, as described above in connection with  FIG.  7   . In some aspects, the identification component  1106  may provide information  1116  associated with the scheduling conflict to the scheduling component  1108 . The scheduling component  1108  may use the information  1116  to schedule or refrain from scheduling at least a portion of the first set of resources for the access link communication based at least in part on the identification of the scheduling conflict and a prioritization rule, as described above in connection with  FIG.  7   . In some aspects, the scheduling component  1108  may provide scheduling information  1118  to the reception component  1104  and/or may provide information  1120  to the transmission component  1110  to schedule and/or to refrain from scheduling a communication. In some aspects, the transmission component  1110  may transmit information  1122  to the apparatus  1150  and/or the apparatus  1155 , as described above in connection with  FIG.  7     
     The apparatus  1102  may include additional components that perform each of the blocks of the algorithm in the aforementioned process  900  of  FIG.  9    and/or the like. Each block in the aforementioned process  900  of  FIG.  9    and/or the like may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof. 
     The number and arrangement of components shown in  FIG.  11    are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in  FIG.  11   . Furthermore, two or more components shown in  FIG.  11    may be implemented within a single component, or a single component shown in  FIG.  11    may be implemented as multiple, distributed components. Additionally, or alternatively, a set of components (e.g., one or more components) shown in  FIG.  11    may perform one or more functions described as being performed by another set of components shown in  FIG.  11   . 
     The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects. 
     As used herein, the term “component” is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software. As used herein, a processor is implemented in hardware, firmware, and/or a combination of hardware and software. 
     As used herein, satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like. 
     It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware, firmware, and/or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods were described herein without reference to specific software code—it being understood that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein. 
     Even though particular combinations of features are recited in the claims and/or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c). 
     No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Also, as used herein, the articles “a” and “an” are intended to include one or more items, and may be used interchangeably with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, a combination of related and unrelated items, and/or the like), and may be used interchangeably with “one or more.” Where only one item is intended, the phrase “only one” or similar language is used. Also, as used herein, the terms “has,” “have,” “having,” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.