Sidelink communications using cellular discontinuous reception configuration

Abstract

A user equipment (UE) receives (605) from a base station a discontinuous reception (DRX) configuration to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including an activation time during which the UE will monitor a physical downlink control channel (PDCCH) and an inactivation time during which the UE will avoid monitoring the PDCCH; identifies (610) a time window for sidelink communication with another UE based at least in part on the DRX configuration; and communicates (615) using one or more sidelink resources in the identified time window.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application Serial No. 62 / 947,983, filed on December 13, 2019, entitled “SIDELINK COMMUNICATION USING A CELLULAR DISCONTINUOUS RECEPTION CONFIGURATION,” and U.S. Non-Provisional Patent Application Serial No. 17 / 094,556, filed on November 10, 2020, entitled “SIDELINK COMMUNICATION USING ACELLULAR DISCONTINUOUS RECEPTION CONFIGURATION,” which are expressly incorporated herein by reference. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications and techniques and apparatus for sidelink communications using a cellular discontinuous reception configuration. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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 released by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include multiple base stations (BS) that may support communications for multiple user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at a city, country, region, or even global level. The new radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard released by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards that use orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) on the downlink (DL), CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and support beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0007] In some aspects, a wireless communication method performed by a user equipment (UE) may include: receiving a discontinuous reception (DRX) configuration from a base station to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor a physical downlink control channel (PDCCH) and inactivation times during which the UE will avoid monitoring the PDCCH; identifying a time window for sidelink communication with another UE based at least in part on the DRX configuration; and communicating using one or more sidelink resources in the identified time window.

[0008] In some aspects, a wireless communication method performed by a base station may include: sending a DRX configuration to a UE to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor a PDCCH and inactivation times during which the UE will avoid monitoring the PDCCH; identifying a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration; and configuring one or more sidelink resources for the UE in the identified time window.

[0009] In some aspects, a UE for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to: receive from a base station a DRX configuration to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including an active time during which the UE will monitor a PDCCH and an inactive time during which the UE will avoid monitoring the PDCCH; identify a time window for sidelink communication with another UE based at least in part on the DRX configuration; and communicate using one or more sidelink resources in the identified time window.

[0010] In some aspects, a base station for wireless communication may include a memory and one or more processors operably coupled to the memory. The memory and the one or more processors may be configured to: send a DRX configuration to a UE to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including an active time during which the UE will monitor a PDCCH and an inactive time during which the UE will avoid monitoring the PDCCH; identify a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration; and configure one or more sidelink resources for the UE in the identified time window.

[0011] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a UE, the one or more instructions may cause the one or more processors to: receive from a base station a DRX configuration to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including an active time during which the UE will monitor a PDCCH and an inactive time during which the UE will avoid monitoring the PDCCH; identify a time window for sidelink communication with another UE based at least in part on the DRX configuration; and communicate using one or more sidelink resources in the identified time window.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When executed by one or more processors of a base station, the one or more instructions may cause the one or more processors to: send a DRX configuration to a UE to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including an active time during which the UE will monitor a PDCCH and an inactive time during which the UE will avoid monitoring the PDCCH; identify a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration; and configure one or more sidelink resources for the UE in the identified time window.

[0013] In some aspects, an apparatus for wireless communication may include: components for receiving a DRX configuration from a base station to be used by the apparatus for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the apparatus will monitor a PDCCH and inactivation times during which the apparatus will avoid monitoring the PDCCH; components for identifying a time window for sidelink communication with another apparatus based at least in part on the DRX configuration; and components for communicating using one or more sidelink resources in the identified time window.

[0014] In some aspects, an apparatus for wireless communication may include: a component for sending a DRX configuration to a UE to be used by the UE for cellular communication with the apparatus, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor a PDCCH and inactivation times during which the UE will avoid monitoring the PDCCH; a component for identifying a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration; and a component for configuring one or more sidelink resources for the UE in the identified time window.

[0015] 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 generally described herein with reference to and as illustrated in the accompanying drawings and description.

[0016] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and methods of operation, and related advantages may be better understood through the following description when considered in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order that the above-mentioned features of the present disclosure may be understood in detail, the contents briefly summarized above may be described in more detail by reference to various aspects, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and therefore should not be considered as limiting the scope thereof, as the description may allow for other equivalent aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0019] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a UE in a wireless communication network according to various aspects of the present disclosure.

[0020] Figure 3 is a diagram illustrating an example of sidelink communications according to various aspects of the present disclosure.

[0021] Figure 4 is a diagram illustrating examples of sidelink communications and access link communications according to various aspects of the present disclosure.

[0022] Figure 5 is a diagram illustrating an example of a discontinuous reception (DRX) configuration according to various aspects of the present disclosure.

[0023] Figures 6 to 9 is a diagram illustrating an example of sidelink communications using a cellular DRX configuration in accordance with various aspects of the present disclosure.

[0024] Fig.10 is a diagram illustrating an example process performed, for example, by a user device according to various aspects of the present disclosure.

[0025] Fig.11 is a diagram illustrating example processes performed, for example, by a base station according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0026] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether the aspect of the present disclosure is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method, wherein the device or method is practiced using other structures, functions, or structures and functions other than the various aspects of the present disclosure set forth herein or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0027] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices 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 a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0028] It should be noted that although terms commonly associated with 3G and / or 4G wireless technologies may be used herein to describe various aspects, various aspects of the present disclosure may be applied to other generation-based communication systems including NR technology, such as 5G and beyond.

[0029] Figure 1 is a diagram showing a wireless network 100 in which various 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 plurality of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NRBS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0030] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access to UEs associated 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. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or more (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.

[0031] In some aspects, the cell may not necessarily be fixed, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected with each other and / or with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, etc.) using any suitable transport network.

[0032] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions of other UEs. Figure 1 In the example shown, a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0033] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a higher transmit power level (e.g., 5 watts to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0034] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0035] UE 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be fixed or mobile. UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. 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 computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0036] 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, etc. that can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, a connection to or to a network (e.g., a wide area network such as the 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 customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (such as a processor component, a memory component, etc.).

[0037] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, channel, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0038] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol, vehicle-to-infrastructure (V2I) protocol, vehicle-to-pedestrian (V2P) protocol, etc.), mesh network, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0039] As pointed out above, Figure 1 are provided as examples. Other examples may be related to Figure 1 Different than described.

[0040] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0041] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding can be used to generate synchronization signals to convey additional information.

[0042] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, 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. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0043] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0044] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the UE 120 may perform one or more techniques associated with sidelink communications using a cellular discontinuous reception configuration, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct e.g. Fig.10 The process of 1000 Fig.11 The operations of process 1100 and / or other processes described herein may be performed by the memory 242 and 282. The memory 242 and 282 may store data and program codes for the base station 110 and the UE 120, respectively. In some aspects, the memory 242 and / or the memory 282 may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, when executed by one or more processors of the base station 110 and / or the UE 120, the one or more instructions may perform or direct, for example, Fig.10 The process of 1000 Fig.11 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0045] In some aspects, UE 120 may include: means for receiving, from a base station, a DRX configuration to be used by UE 120 for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which UE 120 is to monitor PDCCH and inactivation times during which UE 120 is to avoid monitoring PDCCH; means for identifying a time window for sidelink communication with another UE 120 based at least in part on the DRX configuration; means for communicating using one or more sidelink resources in the identified time window; and the like. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, etc.

[0046] In some aspects, the base station 110 may include: a component for sending a DRX configuration to a UE to be used by the UE for cellular communication with the base station 110, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including an activation time during which the UE will monitor the PDCCH and an inactivation time during which the UE will avoid monitoring the PDCCH; a component for identifying a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration; a component for configuring one or more sidelink resources for the UE in the identified time window; and the like. In some aspects, such components may include in conjunction with Figure 2 One or more components of base station 110 are depicted, 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 the like.

[0047] As pointed out above, Figure 2 are provided as examples. Other examples may be related to Figure 2 Different than described.

[0048] Figure 3 is a diagram illustrating an example 300 of sidelink communications in accordance with various aspects of the present disclosure.

[0049] like Figure 3 As shown, the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more sidelink channels 310. UEs 305-1 and 305-2 can communicate using one or more sidelink channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication, V2P communication, etc.), mesh networks, etc. In some aspects, UE 305 may correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, the sidelink channel 310 may use a PC5 interface and / or may operate in a high frequency band (e.g., a 5.9 GHz band). Additionally or alternatively, UE 305 may use a global navigation satellite system (GNSS) timing to synchronize the timing of a transmission time interval (TTI) (e.g., a frame, a subframe, a time slot, a symbol, etc.).

[0050] like Figure 3As further shown, the sidelink channels 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 transmit control information, similar to a physical downlink control channel (PDCCH) and / or a physical uplink control channel (PUCCH) used for cellular communication with the base station 110 via an access link or access channel. The PSSCH 320 may be used to transmit data, similar to a physical downlink shared channel (PDSCH) and / or a physical uplink shared channel (PUSCH) used for cellular communication with the base station 110 via an access link or access channel. For example, the PSCCH 315 may carry sidelink control information (SCI) 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, spatial resources, etc.) in which a transport block (TB) 335 including data is carried on the PSSCH 320. The TB 335 may include data. The PSFCH 325 may be used to transmit sidelink feedback 340, such as hybrid automatic repeat request (HARQ) feedback (eg, acknowledgement or negative acknowledgement (ACK / NACK) information), transmit power control (TPC), scheduling request (SR), and the like.

[0051] In some aspects, the sidelink channel 310 may use a resource pool. For example, a scheduling assignment (e.g., included in the SCI 330) may be sent in a subchannel using specific resource blocks (RBs) across time. In some aspects, a data transmission associated with a scheduling assignment (e.g., on the PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and the associated data transmission are not sent on adjacent RBs.

[0052] In some aspects, the UE 305 may operate using a transmission mode in which resource selection and / or scheduling is performed by the UE 305 (e.g., rather than the base station 110). In some aspects, the UE 305 may perform resource selection and / or scheduling by sensing channel availability for transmission. For example, the UE 305 may measure received signal strength indicator (RSSI) parameters associated with various sidelink channels (e.g., sidelink RSSI (S-RSSI) parameters), may measure reference signal received power (RSRP) parameters associated with various sidelink channels (e.g., PSSCH-RSRP parameters), may measure reference signal received quality (RSRQ) parameters associated with various sidelink channels (e.g., PSSCH-RSRQ parameters), etc., and may select a channel for transmission of sidelink communications based at least in part on the measurements.

[0053] Additionally or alternatively, the UE 305 may perform resource selection and / or scheduling using the SCI 330 received in the PSCCH 315, where the SCI 330 may indicate occupied resources, channel parameters, etc. 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 may use for a particular set of subframes).

[0054] In a transmission mode in which resource selection and / or scheduling is performed by the UE 305, the UE 305 may generate a sidelink grant and may send the grant in the SCI 330. The 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 (e.g., for TB 335) to be used for an upcoming sidelink transmission on the PSSCH 320, 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, etc. In some aspects, the UE 305 may generate a sidelink grant indicating one or more parameters for semi-persistent scheduling (SPS), such as the periodicity of the 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.

[0055] As pointed out above, Figure 3 are provided as examples. Other examples may be related to Figure 3 Different than described.

[0056] Figure 4 is a diagram illustrating an example 400 of sidelink and access link communications in accordance with various aspects of the present disclosure.

[0057] like Figure 4 As shown, the transmitter (Tx) UE 405 and the receiver (Rx) UE 410 can communicate with each other via a side link, as described above in conjunction with Figure 3 Described. Figure 4, Tx UE 405 is illustrated as a Tx / Rx UE because UE 405 may be capable of transmitting and receiving simultaneously, or may transmit at one time and receive at another time. Similarly, Rx UE 410 is illustrated as an Rx / Tx UE because UE 410 may be capable of transmitting and receiving simultaneously, or may transmit at one time and receive at another time. As further shown, in some sidelink modes, base station 110 may communicate with Tx UE 405 via a first access link. Additionally or alternatively, in some sidelink modes, base station 110 may communicate with Rx UE 410 via a second access link. Tx UE 405 and / or Rx UE 410 may correspond to one or more UEs described elsewhere herein, such as Figure 1 UE 120 of the present invention. Thus, “sidelink” may refer to a direct link between UE 120, and “access link” may refer to a direct link between base station 110 and UE 120. Sidelink communications may be sent via the sidelink, and access link communications may be sent via the access link. Access link communications may be downlink communications (from base station 110 to UE 120) or uplink communications (from UE 120 to base station 110). In some aspects, access link communications may be referred to as cellular communications. In some aspects, cellular communications may be subject to a discontinuous reception configuration, as described below in conjunction with Figure 5 as described.

[0058] As pointed out above, Figure 4 are provided as examples. Other examples may be related to Figure 4 Different than described.

[0059] Figure 5 is a diagram illustrating an example 500 of a discontinuous reception (DRX) configuration in accordance with various aspects of the present disclosure.

[0060] like Figure 5 As shown, the base station 110 may send a DRX configuration to the UE 120 to configure a DRX cycle 505 for the UE 120. The DRX cycle 505 may include a DRX on duration 510 (e.g., during which the UE 120 is awake or in an active state) and an opportunity to enter a DRX sleep state 515. As used herein, the time during which the UE 120 is configured to be in an active state during the DRX on duration 510 may be referred to as an active time, and the time during which the UE 120 is configured to be in the DRX sleep state 515 may be referred to as an inactive time. As described below, the UE 120 may monitor a physical downlink control channel (PDCCH) during the active time, and may avoid monitoring the PDCCH during the inactive time.

[0061] During the DRX on duration 510 (e.g., activation time), the UE 120 may monitor a downlink control channel (e.g., PDCCH), as indicated by reference numeral 520. For example, the UE 120 may monitor the PDCCH to obtain downlink control information (DCI) related to the UE 120. If the UE 120 does not detect and / or successfully decode any PDCCH communication intended for the UE 120 during the DRX on duration 510, the UE 120 may enter a sleep state 515 (e.g., for the inactive time) at the end of the DRX on duration 510 (as indicated by reference numeral 525). In this way, the UE 120 may save battery power and reduce power consumption. As shown, the DRX cycle 505 may be repeated at a configured period according to the DRX configuration.

[0062] If the UE 120 detects and / or successfully decodes a PDCCH communication intended for the UE 120, the UE 120 may remain in an active state (e.g., awake) for the duration of the DRX inactivity timer 530 (e.g., which may extend the activation time). The UE 120 may start the DRX inactivity timer 530 at the time the PDCCH communication is received (e.g., in a transmission time interval (TTI), such as a timeslot, a subframe, etc., in which the PDCCH communication is received). The UE 120 may remain in the active state until the DRX inactivity timer 530 expires, at which time the UE 120 may enter the sleep state 515 (e.g., for the inactivity time), as indicated by reference numeral 535. During the duration of the DRX inactivity timer 530, the UE 120 may continue to monitor PDCCH communications, may obtain downlink data communications scheduled by the PDCCH communications (e.g., on a downlink data channel such as a physical downlink shared channel (PDSCH)), may prepare and / or send uplink communications scheduled by the PDCCH communications (e.g., on a physical uplink shared channel (PUSCH)), etc. The UE 120 may restart the DRX inactivity timer 530 each time a PDCCH communication intended for the UE 120 is detected for an initial transmission (e.g., but not for a retransmission).

[0063] By operating in this manner, the UE 120 may save battery power and reduce power consumption by entering a sleep state 515. However, the DRX configuration may only apply to cellular communications (e.g., access link communications) between the UE 120 and the base station 110, such as uplink communications or downlink communications. Traditionally, power consumption has not been a significant issue for UEs 120 using sidelink communications such as V2X communications, because such UEs 120 are typically integrated into vehicles and battery power is not a constraint on the operation of such UEs. However, some UEs 120 that communicate using sidelink communications such as V2X communications (e.g., V2P communications) may not be integrated into vehicles and may have limited battery power. For example, a UE 120 carried by a pedestrian, cyclist, etc. may be power-constrained.

[0064] Some techniques and apparatus described herein enable UE 120 to identify a time window for sidelink communications based at least in part on a DRX configuration intended for cellular (e.g., access link) communications. This may enable UE 120 to monitor and / or send sidelink communications in a limited time window, rather than continuously monitoring and / or sending sidelink communications, thereby conserving UE resources, reducing UE power consumption, and conserving UE battery power. In addition, some techniques and apparatus described herein allow for improved network scheduling and coordination. Although Figure 5 A connected mode DRX (CDRX) configuration is shown, but the techniques and apparatus described herein are equally applicable to an idle mode DRX configuration, which may include cyclically occurring active and inactive times.

[0065] As pointed out above, Figure 5 are provided as examples. Other examples may be related to Figure 5 Different than described.

[0066] Figure 6 is a diagram illustrating an example 600 of sidelink communications using a cellular DRX configuration in accordance with various aspects of the present disclosure.

[0067] like Figure 6As shown, the base station 110 and the first UE 120-1 can communicate with each other via cellular (e.g., access link) communication, and the first UE 120-1 and the second UE 120-2 can communicate with each other via sidelink communication. In some aspects, the first radio frequency (RF) spectrum band is used for cellular communication between the first UE 120-1 and the base station 110, and the second RF spectrum band is used for sidelink communication between the first UE 120-1 and the second UE 120-2. For example, cellular communication can use commercial spectrum, licensed spectrum, etc., such as 3.5GHz spectrum band. As another example, sidelink communication can use unlicensed spectrum, intelligent transmission spectrum (ITS), etc., such as 5.9GHz spectrum band.

[0068] As shown by reference numeral 605, the base station 110 may send a DRX configuration to the first UE 120-1. Figure 5 Details about DRX configuration are described. In some aspects, the base station 110 may send a DRX configuration in a radio resource control (RRC) message (e.g., an RRC configuration message, an RRC reconfiguration message, etc.), such as for an RRC connected mode DRX configuration. Additionally or alternatively, the base station 110 may send a DRX configuration in a system information block (SIB), such as for an RRC idle mode DRX configuration (e.g., for paging monitoring). The DRX configuration may be applied to cellular communications (sometimes referred to as access link communications) between the first UE 120-1 and the base station 110. For example, the DRX configuration may indicate a DRX cycle that includes a first time period (e.g., an activation time) during which the first UE 120-1 monitors the PDCCH and a second time period (e.g., an inactive time) during which the first UE 120-1 avoids monitoring the PDCCH. In some cases, the DRX configuration may be referred to as a cellular DRX configuration. The techniques and apparatus described herein are applicable to both an RRC connected mode DRX configuration and an RRC idle mode DRX configuration.

[0069] As shown at 610, the first UE 120-1 may identify a time window (e.g., one or more time windows) for sidelink communication with one or more other UEs 120 (e.g., including the second UE 120-2) based at least in part on the DRX configuration. Figure 4 As described, sidelink communications may be conducted directly between UEs 120 (e.g., without passing through base station 110, and in some cases, without being scheduled by base station 110), and cellular communications may be conducted directly between UE 120 and base station 110 (sometimes referred to as uplink and / or downlink communications).

[0070] like Figure 6As shown, in some aspects, the time window shown as the sidelink (SL) time window may be included in the DRX inactive time (e.g., may be the same as or may be a portion of the DRX inactive time). Figure 6 In some aspects, the time window is part of the DRX inactive time. However, in some aspects, the time window can be the same as the DRX inactive time (e.g., can be the same time period with the same start and end). By using the cellular DRX configuration to implicitly indicate the time window for sidelink communications occurring during the DRX inactive time, interference and conflicts between cellular communications and sidelink communications can be reduced.

[0071] Alternatively, in some aspects, the time window may be included in the DRX activation time (e.g., may be the same as or may be a portion of the DRX activation time). For example, the time window may be a portion of the DRX activation time. Alternatively, the time window may be the same as the DRX activation time (e.g., may be the same time period with the same start and end as the DRX activation time). By using the cellular DRX configuration to implicitly indicate the time window for sidelink communications occurring during the DRX activation time, UE battery power may be saved by preserving the DRX inactive time.

[0072] In some aspects, the time window may overlap with the DRX activation time and the DRX inactive time. For example, a first portion (e.g., an initial portion) of the time window may occur in the DRX activation time, and a second portion (e.g., a remaining portion) of the time window may occur in the DRX inactive time. Alternatively, a first portion (e.g., an initial portion) of the time window may occur in the DRX inactive time, and a second portion (e.g., a remaining portion) of the time window may occur in the DRX activation time. In this manner, sidelink communications may be flexibly configured to achieve a tradeoff between preventing interference with cellular communications and conserving UE battery power.

[0073] like Figure 6As shown, in some aspects, the time window may occur once per DRX cycle (e.g., with a specific periodicity). However, in some aspects, the DRX configuration may indicate that there are multiple time windows per DRX cycle. Any specific time window may be reserved for sidelink reception only by the first UE 120-1 (rather than sidelink transmission by the first UE 120-1), for sidelink transmission only by the first UE 120-1 (rather than sidelink reception by the first UE 120-1), or for both sidelink reception and sidelink transmission by the first UE 120-1. In some aspects, the DRX configuration may indicate a first time window for sidelink reception only (rather than sidelink transmission) and a second time window for sidelink transmission only (rather than sidelink reception). In some aspects, the first time window and the second time window may each occur once per DRX cycle.

[0074] In some aspects, the DRX configuration may imply (e.g., may implicitly indicate) the duration of the time window (e.g., the duration in terms of the number of code elements, time slots, etc.), the starting boundary and / or the ending boundary of the time window (e.g., which may be indicated as an offset from the boundary of the DRX activation time or the DRX inactivation time), the number of time windows per DRX cycle, etc.

[0075] As indicated by reference numeral 615, the first UE 120-1 may communicate with one or more other UEs 120 (e.g., including the second UE 120-2) using one or more sidelink resources included in the identified time window. For example, the one or more sidelink resources may include one or more time domain resources included in the time window (e.g., appearing within the boundaries of the time window, such as at or after the start of the time window, or at or before the end of the time window). In example 600, the one or more sidelink resources are not configured and / or scheduled by the base station 110. That is, the one or more sidelink resources may be configured and / or scheduled by one or more UEs 120 (e.g., the first UE 120-1, the second UE 120-2, etc.). However, in some aspects, the one or more sidelink resources may be configured and / or scheduled by the base station 110, as described below in conjunction with Figure 7 In some aspects, the first UE 120-1 may refrain from sending and / or receiving sidelink communications outside of the identified time window.

[0076] In some aspects, UE 120 may not be able to communicate using the first RF spectrum band and the second RF spectrum band at the same time. In this case, cellular communication between the first UE 120-1 and the base station 110 may occur outside the identified time window, and sidelink communication between the first UE 120-1 and the second UE 120-2 may occur within the time window. However, in some aspects, UE 120 (e.g., a multi-antenna UE 120) may be able to communicate using the first RF spectrum band and the second RF spectrum band at the same time. In this case, for the first UE 120-1, cellular communication and sidelink communication may overlap.

[0077] As pointed out above, Figure 6 are provided as examples. Other examples may be related to Figure 6 For example, although the first UE 120-1 is Figure 6 1 is shown as communicating with a single other UE 120 (e.g., second UE 120-2), but the first UE 120-1 may communicate with multiple other UEs 120 using sidelink communications (e.g., within the identified time window).

[0078] By enabling UE 120 to identify a time window for sidelink communications based at least in part on a DRX configuration intended for cellular (e.g., access link) communications, UE 120 may be able to monitor and / or send sidelink communications within a limited time window rather than continuously monitoring and / or sending sidelink communications, thereby conserving UE resources, reducing UE power consumption, and conserving UE battery power. Additionally or alternatively, conflicts and / or interference between sidelink communications and cellular communications may be reduced, as described above. In addition, base station 110 may coordinate DRX configurations across multiple UEs 120 served by base station 110 to enable those UEs 120 to communicate with reduced power consumption and signaling during the sidelink time window.

[0079] Figure 7 is a diagram illustrating an example 700 of sidelink communications using a cellular DRX configuration in accordance with various aspects of the present disclosure. Figure 7 The example 700 is similar to Figure 6 Example 600, except that in example 700, the base station 110 can configure and / or schedule sidelink resources for the first UE 120-1 and / or the second UE 120-2. As shown in reference numeral 705, the base station 110 can send a DRX configuration to the first UE 120-1, as described above in conjunction with Figure 5 and Figure 6 as described.

[0080] As shown in reference numeral 710, the base station 110 may be configured as described above in conjunction with Figure 6 In a similar manner as described above, a time window (e.g., one or more time windows) for sidelink communication between the first UE 120-1 and one or more other UEs 120 (e.g., including the second UE 120-2) is identified at least in part based on the DRX configuration. For example, the time window may have the above combined Figure 6 any of the features described.

[0081] As indicated by reference numeral 715, the base station 110 may configure (e.g., schedule) one or more sidelink resources for the first UE 120-1 in the identified time window. For example, the base station 110 may configure the one or more sidelink resources using control information such as DCI and / or SCI. The sidelink resources may include, for example, time domain resources, frequency domain resources, space domain resources, etc. The sidelink resources may appear in the identified time window (e.g., may include time domain resources that appear in the identified time window).

[0082] Additionally or alternatively, the base station 110 may configure (e.g., schedule) one or more cellular communications for the first UE 120-1 outside of the identified time window to reduce interference or conflict between the sidelink and the cellular communications. In some aspects, the base station 110 may configure or schedule one or more resources (e.g., time domain resources, frequency domain resources, spatial domain resources, etc.) for cellular communications using DCI. In some aspects, the base station 110 may schedule cellular communications for the first UE 120-1 to avoid conflict with the sidelink communications scheduled for the first UE 120-1.

[0083] As shown at 720, the first UE 120-1 may communicate with one or more other UEs 120 (e.g., including the second UE 120-2) using one or more sidelink resources configured and / or scheduled by the base station 110 and included in the identified time window, as described above in conjunction with Figure 6 as described.

[0084] By configuring sidelink resources within a time window based at least in part on a DRX configuration intended for cellular (e.g., access link) communications, base station 110 may be able to schedule sidelink resources to reduce UE power consumption or reduce conflicts and / or interference between sidelink communications and cellular communications.

[0085] As pointed out above, Figure 7 are provided as examples. Other examples may be related to Figure 7 Different than described.

[0086] Figure 8 is a diagram illustrating an example 800 of sidelink communications using a cellular DRX configuration in accordance with various aspects of the present disclosure. Figure 8 Example features of a time window for sidelink communications (sometimes referred to as a sidelink time window or SL time window) are shown, which may be implied, determined, or derived based at least in part on a DRX configuration, as described above in conjunction with Figure 6 and Figure 7 as described.

[0087] In some aspects, the sidelink time window may be included in the activation time of the DRX cycle. For example, as shown in reference numeral 805, the sidelink time window may be the same as the DRX activation time (e.g., may be the same time period with the same start and end). In this case, the two boundaries of the DRX activation time and the sidelink time window (e.g., the start time and the end time of both the DRX activation time and the sidelink time window) may be aligned. Alternatively, as shown in reference numeral 810, the sidelink time window may be part of the DRX activation time. In some aspects, a single boundary of the DRX activation time and the sidelink time window (e.g., shown as an end boundary, but it may alternatively be a start boundary) may be aligned. In some aspects, none of the boundaries of the sidelink time window is aligned with the boundaries of the DRX activation time. By using a cellular DRX configuration to implicitly indicate a time window for sidelink communications occurring during the DRX activation time, UE battery power may be saved by retaining the DRX inactive time.

[0088] In some aspects, the sidelink time window may be included in the inactive time of the DRX cycle. For example, as shown in reference numeral 815, the sidelink time window may be the same as the DRX inactive time (e.g., may be the same time period with the same start and end). In this case, the two boundaries of the DRX inactive time and the sidelink time window (e.g., the start time and the end time of both the DRX inactive time and the sidelink time window) may be aligned. Alternatively, as shown in reference numeral 820, the sidelink time window may be part of the DRX inactive time. In some aspects, a single boundary of the DRX inactive time and the sidelink time window (e.g., shown as a start boundary, but it may alternatively be an end boundary) may be aligned. In some aspects, none of the boundaries of the sidelink time window is aligned with the boundaries of the DRX inactive time. By using a cellular DRX configuration to implicitly indicate a time window for sidelink communications occurring during the DRX inactive time, interference and conflicts between cellular communications and sidelink communications may be reduced.

[0089] As shown in the reference numeral 825, in some aspects, the sidelink time window can overlap with the DRX activation time and the DRX inactive time. As shown, in some aspects, the first part (e.g., the initial part) of the sidelink time window can appear in the DRX inactive time, and the second part (e.g., the remaining part) of the sidelink time window can appear in the DRX activation time. Alternatively, the first part (e.g., the initial part) of the sidelink time window can appear in the DRX activation time, and the second part (e.g., the remaining part) of the sidelink time window can appear in the DRX inactive time. In this way, the sidelink communication can be flexibly configured to achieve a trade-off between preventing interference with cellular communications and saving UE battery power.

[0090] As pointed out above, Figure 8 are provided as examples. Other examples may be related to Figure 8 Different than described.

[0091] Fig. 9 is a diagram illustrating an example 900 of sidelink communications using a cellular DRX configuration in accordance with various aspects of the present disclosure. Fig. 9 Example features of a time window for sidelink communications (sometimes referred to as a sidelink time window or SL time window) are shown, which may be implied, determined, or derived based at least in part on a DRX configuration, as described above in conjunction with Figure 6 and Figure 7 as described.

[0092] As shown in reference numeral 905, in some aspects, the sidelink time window may occur once per DRX cycle (e.g., with a specific periodicity). As shown in reference numeral 910, in some aspects, the DRX configuration may indicate that there are multiple sidelink time windows per DRX cycle. Any particular time window may be reserved for sidelink reception only by UE 120 (rather than sidelink transmission by UE 120), for sidelink transmission only by UE 120 (rather than sidelink reception by UE 120), or for both sidelink reception and sidelink transmission by UE 120. In some aspects, the DRX configuration may indicate a first time window for sidelink reception only (rather than sidelink transmission) and a second time window for sidelink transmission only (rather than sidelink reception). In some aspects, the first time window and the second time window may each occur once per DRX cycle.

[0093] As pointed out above, Fig. 9 are provided as examples. Other examples may be related to Fig. 9 Different than described.

[0094] Fig.10 1 is a diagram illustrating an example process 1000, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 1000 is an example in which a UE (eg, UE 120, etc.) performs operations associated with sidelink communications using a cellular DRX configuration.

[0095] like Fig.10 As shown, in some aspects, process 1000 may include receiving, from a base station, a DRX configuration to be used by a UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor the PDCCH and inactivation times during which the UE will avoid monitoring the PDCCH (block 1010). For example, a UE (e.g., using a receive processor 258, a controller / processor 280, a memory 282, etc.) may receive, from a base station, a DRX configuration to be used by the UE for cellular communication with the base station, as described above. In some aspects, the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor the PDCCH and inactivation times during which the UE will avoid monitoring the PDCCH.

[0096] like Fig.10 As further shown, in some aspects, process 1000 may include identifying a time window for sidelink communication with another UE based at least in part on the DRX configuration (block 1020). For example, the UE (e.g., using receive processor 258, controller / processor 280, memory 282, etc.) may identify a time window for sidelink communication with another UE based at least in part on the DRX configuration, as described above.

[0097] like Fig.10 As further shown, in some aspects, process 1000 may include communicating using one or more sidelink resources in the identified time window (block 1030). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may communicate using one or more sidelink resources in the identified time window, as described above.

[0098] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0099] In a first aspect, one or more sidelink resources are not configured by a base station.

[0100] In a second aspect, alone or in combination with the first aspect, one or more sidelink resources are configured by a base station.

[0101] In a third aspect, alone or in combination with one or more of the first and second aspects, the first radio frequency spectrum band is used for cellular communication with a base station and the second radio frequency spectrum band is used for sidelink communication with another UE.

[0102] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the time window is included in the activation time of the DRX cycle.

[0103] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the time window is a time period that is the same as an activation time of a DRX cycle.

[0104] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the time window is a portion of the activation time of the DRX cycle.

[0105] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the time window is included in the inactive time of the DRX cycle.

[0106] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the time window is a time period that is the same as the inactive time of the DRX cycle.

[0107] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the time window is a portion of the inactive time of the DRX cycle.

[0108] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the time window overlaps the activation time and the inactivation time.

[0109] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the time window occurs once in each DRX cycle.

[0110] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the time window is one of a plurality of time windows occurring in each DRX cycle identified at least in part based on a DRX configuration.

[0111] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the time window is used for one of: receiving sidelink communications but not for sending sidelink communications, sending sidelink communications but not for receiving sidelink communications, or sending and receiving sidelink communications.

[0112] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the DRX configuration indicates at least one of: the duration of the time window, the starting boundary of the time window, the ending boundary of the time window, the number of time windows per DRX cycle, or a combination thereof.

[0113] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, identifying a time window for sidelink communication includes identifying a time window for sidelink communication based at least in part on at least one of an activation time or an inactivation time.

[0114] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, identifying a time window for sidelink communication includes: identifying at least one of a duration of the time window, a starting boundary of the time window, or an ending boundary of the time window based at least in part on a DRX configuration.

[0115] In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the boundaries of the time window for sidelink communication are aligned with the boundaries of the activation time.

[0116] although Fig.10 Example blocks of process 1000 are shown, but in some aspects, similar to Fig.10 Process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in FIG. Additionally or alternatively, two or more of the blocks of process 1000 may be performed in parallel.

[0117] Fig.11 1 is a diagram illustrating an example process 1100, for example, performed by a base station, in accordance with various aspects of the present disclosure. Example process 1100 is an example in which a base station (eg, base station 110, etc.) performs operations associated with sidelink communications using a cellular DRX configuration.

[0118] like Fig.11 As shown, in some aspects, process 1100 may include sending to the UE a DRX configuration to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor the PDCCH and inactivation times during which the UE will avoid monitoring the PDCCH (block 1110). For example, the base station (e.g., using the transmit processor 220, the controller / processor 240, the memory 242, etc.) may send to the UE a DRX configuration to be used by the UE for cellular communication with the base station, as described above. In some aspects, the DRX configuration indicates a DRX cycle, the DRX cycle including activation times during which the UE will monitor the PDCCH and inactivation times during which the UE will avoid monitoring the PDCCH.

[0119] like Fig.11 As further shown, in some aspects, process 1100 may include identifying a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration (block 1120). For example, the base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may identify a time window for sidelink communication between the UE and another UE based at least in part on the DRX configuration, as described above.

[0120] like Fig.11 As further shown, in some aspects, process 1100 may include configuring and / or transmitting one or more sidelink resources for the UE in the identified time window (block 1130). For example, the base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may configure one or more sidelink resources for the UE in the identified time window, as described above. Base station 110 may transmit the configured one or more sidelink resources to the UE, such as in downlink control information or another message.

[0121] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0122] In a first aspect, process 1100 includes scheduling one or more cellular communications between a UE and a base station outside of an identified time window.

[0123] In a second aspect, either alone or in combination with the first aspect, a first band of radio frequency spectrum is used for cellular communications and a second band of radio frequency spectrum is used for sidelink communications.

[0124] In a third aspect, alone or in combination with one or more of the first and second aspects, the time window is at least one of the following: included in the activation time of the DRX cycle, the same time period as the activation time of the DRX cycle, a part of the activation time of the DRX cycle, included in the inactive time of the DRX cycle, the same time period as the inactive time of the DRX cycle, a part of the inactive time of the DRX cycle, or overlapping with the activation time of the DRX cycle and the inactive time of the DRX cycle.

[0125] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the time window occurs once in each DRX cycle.

[0126] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the time window is one of a plurality of time windows occurring in each DRX cycle identified at least in part based on a DRX configuration.

[0127] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, the time window is used for one of: receiving sidelink communications but not sending sidelink communications, sending sidelink communications but not receiving sidelink communications, or sending and receiving sidelink communications.

[0128] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, the DRX configuration indicates at least one of: the duration of the time window, the starting boundary of the time window, the ending boundary of the time window, the number of time windows per DRX cycle, or a combination thereof.

[0129] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, identifying a time window for sidelink communication includes identifying the time window for sidelink communication based at least in part on at least one of an activation time or an inactivation time.

[0130] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, identifying a time window for sidelink communication includes identifying at least one of a duration of the time window, a starting boundary of the time window, or an ending boundary of the time window based at least in part on a DRX configuration.

[0131] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the boundaries of the time window for sidelink communication are aligned with the boundaries of the activation time.

[0132] although Fig.11 Example blocks of process 1100 are shown, but in some aspects, the Fig.11 The process 1100 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks compared to the blocks depicted in. Additionally or alternatively, two or more of the blocks of the process 1100 may be performed in parallel.

[0133] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the various aspects.

[0134] As used herein, the term "component" is intended to be broadly interpreted 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.

[0135] As used herein, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0136] It will be apparent that the systems and / or methods described herein can be implemented in various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, the operation and behavior of the systems and / or methods are described herein without reference to specific software code, and it should be understood that software and hardware can be designed to implement the systems and / or methods based at least in part on the description herein.

[0137] Even though specific combinations of features are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features can be combined in ways that are not specifically described 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 the various aspects includes each dependent claim combined with each other claim in the claim set. A phrase referring to "at least one" in a list of items refers to any combination of those items including a single member. As an example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc or any other ordering of a, b, and c).

[0138] Unless explicitly described in this way, any element, action or instruction used herein should not be interpreted as critical or necessary. In addition, as used herein, the articles "one" and "an" are intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set" and "grouping" are intended to include one or more items (e.g., related items, unrelated items, combinations of related items and unrelated items, etc.), and can be used interchangeably with "one or more". In the case of being intended to have only one item, the phrase "only one" or similar language is used. In addition, as used herein, the terms "has", "have", "having" etc. are intended to be open terms. In addition, unless otherwise expressly stated, the phrase "based on" is intended to mean "based at least in part on".

Claims

1. A method of wireless communication performed by a user equipment UE, comprising: receiving, from a base station, a discontinuous reception (DRX) configuration to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle including an activation time during which the UE is to monitor a physical downlink control channel (PDCCH) and an inactivation time during which the UE is to avoid monitoring the PDCCH; identifying a time window for sidelink communication with another UE based at least in part on the DRX configuration; and communicating using one or more sidelink resources during the identified time window, The one or more sidelink resources are not configured by the base station.

2. The method of claim 1, wherein a first radio frequency spectrum band is used for the cellular communication with the base station, and a second radio frequency spectrum band is used for the sidelink communication with the other UE.

3. The method according to claim 1, wherein the time window is at least one of the following: included in the activation time of the DRX cycle, a time period that is the same as the activation time of the DRX cycle, a portion of the activation time of the DRX cycle, included in the inactive time of the DRX cycle, a time period that is the same as the inactive time of the DRX cycle, a portion of the inactive time of the DRX cycle, or Overlapping with the activation time of the DRX cycle and the inactivation time of the DRX cycle. The method according to claim 1 , wherein the time window occurs once in each DRX cycle.

5. The method of claim 1, wherein the time window is one of a plurality of time windows occurring in each DRX cycle identified at least in part based on the DRX configuration.

6. The method of claim 1, wherein the time window is used for at least one of the following: receives sidelink communications but is not used to transmit sidelink communications, to transmit sidelink communications but not to receive sidelink communications, or Send and receive sidelink communications.

7. The method of claim 1, wherein the DRX configuration indicates at least one of: a duration of the time window, a start boundary of the time window, an end boundary of the time window, a number of time windows per DRX cycle, or a combination thereof.

8. The method of claim 1 , wherein identifying the time window for sidelink communication comprises: The time window for sidelink communication is identified based at least in part on at least one of the activation time or the inactivity time.

9. The method of claim 1 , wherein identifying the time window for sidelink communication comprises: At least one of a duration of the time window, a starting boundary of the time window, or an ending boundary of the time window is identified based at least in part on the DRX configuration.

10. The method of claim 1, wherein a boundary of the time window for sidelink communication is aligned with a boundary of the activation time.

11. A user equipment UE for wireless communication, comprising: Memory; as well as One or more processors operably coupled to the memory, the memory and the one or more processors configured to: receiving, from a base station, a discontinuous reception (DRX) configuration to be used by the UE for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle including an active time during which the UE is to monitor a physical downlink control channel (PDCCH) and an inactive time during which the UE is to avoid monitoring the PDCCH; identifying a time window for sidelink communication with another UE based at least in part on the DRX configuration; and One or more sidelink resources are used for communicating during the identified time window, wherein the one or more sidelink resources are not configured by the base station.

12. The UE according to claim 11, wherein the time window is at least one of the following: included in the activation time of the DRX cycle, a time period that is the same as the activation time of the DRX cycle, a portion of the activation time of the DRX cycle, included in the inactive time of the DRX cycle, a time period that is the same as the inactive time of the DRX cycle, a portion of the inactive time of the DRX cycle, or Overlapping with the activation time of the DRX cycle and the inactivation time of the DRX cycle. The UE according to claim 11 , wherein the time window occurs once in each DRX cycle.

14. The UE of claim 11, wherein the time window is one of a plurality of time windows occurring in each DRX cycle identified at least in part based on the DRX configuration.

15. The UE according to claim 11, wherein the DRX configuration indicates at least one of the following: a duration of the time window, a start boundary of the time window, an end boundary of the time window, a number of time windows per DRX cycle, or a combination thereof.

16. A UE according to claim 11, wherein the one or more processors, when identifying the time window for sidelink communication, are configured to: identify the time window for sidelink communication based at least in part on at least one of the activation time or the inactivation time.

17. A UE according to claim 11, wherein the one or more processors, when identifying the time window for sidelink communication, are configured to: identify at least one of the duration of the time window, the starting boundary of the time window, or the ending boundary of the time window based at least in part on the DRX configuration.

18. The UE of claim 11, wherein a boundary of the time window for sidelink communication is aligned with a boundary of the activation time.

19. An apparatus for wireless communication, comprising: means for receiving, from a base station, a discontinuous reception (DRX) configuration to be used by the apparatus for cellular communication with the base station, wherein the DRX configuration indicates a DRX cycle including an active time during which the apparatus is to monitor a physical downlink control channel (PDCCH) and an inactive time during which the apparatus is to refrain from monitoring the PDCCH; means for identifying a time window for sidelink communication with another apparatus based at least in part on the DRX configuration; as well as means for communicating using one or more sidelink resources during the identified time window, The one or more sidelink resources are not configured by the base station.

20. The apparatus for wireless communication of claim 19, further comprising means for performing the method of any one of claims 2 to 10.

21. A non-transitory computer-readable medium storing one or more instructions for wireless communication, wherein when the one or more instructions are executed by one or more processors of a user equipment (UE), the one or more processors cause the one or more processors to perform the method of any one of claims 1 to 10.

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