Discontinuous reception for Mode 1 sidelink

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive an indication of an access link discontinuous reception (DRX) configuration and a side link DRX configuration from a base station (BS). The access link DRX configuration and the side link DRX configuration may synchronize the access link DRX operation and the side link DRX operation of the UE. The UE may perform access link communications with the BS based at least in part on the access link DRX configuration and / or may perform side link communications with another UE based at least in part on the side link DRX configuration. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 887,260, filed on August 15, 2019, entitled “DISCONTINUOUS RECEPTION FOR MODE 1 SIDELINK,” and U.S. Non-Provisional Patent Application No. 16 / 947,596, filed on August 7, 2020, entitled “DISCONTINUOUS RECEPTION FOR MODE 1 SIDELINK,” which are hereby expressly incorporated herein by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for discontinuous reception (DRX) operation for a Mode 1 sidelink.

[0005] background

[0006] Wireless communication systems are widely deployed to provide various 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 promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless communication network may include several base stations (BS) that can support communication of several 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, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set 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 spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also referred to as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to better integrate with other open standards. However, as the demand for mobile broadband access continues to grow, 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.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a user equipment (UE) may include: receiving a sidelink configured grant from a base station on an access link; transitioning to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant; and communicating with another UE on the sidelink using the sidelink configured grant while in the idle mode or the inactive mode on the access link.

[0011] In some aspects, a wireless communication method performed by a UE may include: transmitting an indication to a BS to suspend an inactivity timer when requesting a sidelink communication grant; receiving a sidelink configured grant from the base station on an access link from the BS based at least in part on transmitting the indication; and suspending the access link inactivity timer based at least in part on receiving the sidelink configured grant with the suspension indication so that the UE suppresses transitioning to an idle mode or an inactive mode on the access link.

[0012] In some aspects, a wireless communication method performed by a UE may include: transmitting a request to a BS for radio resources for transmitting sidelink communications to another UE on a sidelink; and receiving from the BS an indication of timing for retransmitting the request for radio resources to the BS based at least in part on transmitting the request for radio resources, wherein the indication of the timing is based at least in part on the other UE being in a sidelink discontinuous reception sleep mode.

[0013] In some aspects, a wireless communication method performed by a BS may include: receiving a request from a first UE for radio resources for transmitting sidelink communications to a second UE on a sidelink; determining that the second UE is in a sidelink discontinuous reception (DRX) sleep mode; and transmitting to the first UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period in which the second UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE is in the sidelink DRX sleep mode.

[0014] In some aspects, a wireless communication method performed by a UE may include: transmitting a request to a BS to synchronize an access link DRX operation and a side link DRX operation of the UE; receiving an indication of an access link DRX configuration and a side link DRX configuration from the BS based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and at least one of the following: performing access link communication with the BS based at least in part on the access link DRX configuration, or performing side link communication with another UE based at least in part on the side link DRX configuration.

[0015] In some aspects, a wireless communication method performed by a BS may include: configuring an access link DRX configuration and a side link DRX configuration for a UE so that the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and transmitting an indication of the access link DRX configuration and the side link DRX configuration to the UE.

[0016] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive a sidelink configured grant from a base station on an access link; transition to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant; and communicate with another UE on the sidelink using the sidelink configured grant while in the idle mode or the inactive mode on the access link.

[0017] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit an indication of suspending an inactivity timer to a BS when requesting a sidelink communication grant; receive a sidelink configured grant from the BS on an access link from a base station based at least in part on transmitting the indication; and suspend the access link inactivity timer based at least in part on receiving the sidelink configured grant with the suspend indication so that the UE refrains from transitioning to an idle mode or an inactive mode on the access link.

[0018] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit a request for radio resources for transmitting sidelink communications to another UE on a sidelink to a BS; and receive an indication of timing for retransmitting the request for radio resources to the BS based at least in part on transmitting the request for radio resources, wherein the indication of the timing is based at least in part on the other UE being in a sidelink discontinuous reception sleep mode.

[0019] In some aspects, a BS for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive a request from a first UE for radio resources for transmitting sidelink communications to a second UE on a sidelink; determine that the second UE is in a sidelink DRX sleep mode; and transmit to the first UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period when the second UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE is in the sidelink DRX sleep mode.

[0020] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: transmit a request to a BS to synchronize access link DRX operation and side link DRX operation of the UE; receive an indication of an access link DRX configuration and a side link DRX configuration from the BS based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and at least one of the following: perform access link communication with the BS based at least in part on the access link DRX configuration, or perform side link communication with another UE based at least in part on the side link DRX configuration.

[0021] In some aspects, a BS for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: configure an access link DRX configuration and a side link DRX configuration for a UE so that the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and transmit an indication of the access link DRX configuration and the side link DRX configuration to the UE.

[0022] 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 UE, may cause the one or more processors to: receive a sidelink configured grant from a BS on an access link; transition to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant; and communicate with another UE on the sidelink using the sidelink configured grant while in the idle mode or the inactive mode on the access link.

[0023] 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 UE, may cause the one or more processors to: transmit an indication of suspending an inactivity timer to a BS when requesting a sidelink communication grant; receive a sidelink configured grant from a base station on an access link from the BS based at least in part on transmitting the indication; and suspend the access link inactivity timer based at least in part on receiving the sidelink configured grant with the suspend indication so that the UE refrains from transitioning to an idle mode or an inactive mode on the access link.

[0024] 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 UE, may cause the one or more processors to: transmit a request for radio resources for transmitting sidelink communications to another UE on a sidelink to a BS; and receive an indication of timing for retransmitting the request for radio resources to the BS based at least in part on transmitting the request for radio resources, wherein the indication of the timing is based at least in part on the other UE being in a sidelink discontinuous reception sleep mode.

[0025] 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 BS, may cause the one or more processors to: receive a request for radio resources for transmitting sidelink communications to a second UE on a sidelink from a first UE; determine that the second UE is in a sidelink DRX sleep mode; and transmit to the first UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period when the second UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE is in the sidelink DRX sleep mode.

[0026] 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 UE, may cause the one or more processors to: transmit a request to a BS to synchronize access link DRX operation and side link DRX operation of the UE; receive an indication of an access link DRX configuration and a side link DRX configuration from the BS based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and at least one of the following: perform access link communication with the BS based at least in part on the access link DRX configuration, or perform side link communication with another UE based at least in part on the side link DRX configuration.

[0027] 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 BS, may cause the one or more processors to: configure an access link DRX configuration and a side link DRX configuration for a UE so that the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and transmit an indication of the access link DRX configuration and the side link DRX configuration to the UE.

[0028] In some aspects, an apparatus for wireless communication may include: a device for receiving a sidelink configured grant from a base station on an access link; a device for transitioning to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant; and a device for communicating with another apparatus on the sidelink using the sidelink configured grant while in the idle mode or the inactive mode on the access link.

[0029] In some aspects, an apparatus for wireless communications may include: a device for transmitting an indication to a BS to suspend an inactivity timer when requesting a sidelink communications grant; a device for receiving a sidelink configured grant from the BS on an access link from a base station based at least in part on transmitting the indication; and a device for suspending the access link inactivity timer based at least in part on receiving the sidelink configured grant with the suspension indication so that the equipment suppresses transitioning to an idle mode or an inactive mode on the access link.

[0030] In some aspects, an apparatus for wireless communications may include: a device for transmitting a request to a BS for radio resources for transmitting sidelink communications to another equipment on a sidelink; and a device for receiving from the BS an indication of timing for retransmitting the request for radio resources to the BS based at least in part on transmitting the request for radio resources, wherein the indication of the timing is based at least in part on the other equipment being in a sidelink discontinuous reception sleep mode.

[0031] In some aspects, an apparatus for wireless communications may include: a device for receiving a request for radio resources for transmitting sidelink communications to a second UE on a sidelink from a first UE; a device for determining that the second UE is in a sidelink DRX sleep mode; and a device for transmitting to the first UE an indication of timing for retransmitting the request for radio resources to the apparatus or an indication of a sidelink grant for a time period in which the second UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE is in the sidelink DRX sleep mode.

[0032] In some aspects, an apparatus for wireless communication may include: a device for transmitting a request to a BS to synchronize access link DRX operation and side link DRX operation of the equipment; a device for receiving indications of access link DRX configuration and side link DRX configuration from the BS based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and side link DRX operation of the equipment; and at least one of the following: a device for performing access link communication with the BS based at least in part on the access link DRX configuration, or a device for performing side link communication with another equipment based at least in part on the side link DRX configuration.

[0033] In some aspects, an apparatus for wireless communication may include: a device for configuring an access link DRX configuration and a side link DRX configuration for a UE so that the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; and a device for transmitting an indication of the access link DRX configuration and the side link DRX configuration to the UE.

[0034] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0037] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0038] Figure 2 is a block diagram conceptually illustrating an example of a base station (BS) and a user equipment (UE) in communication in a wireless communication network according to various aspects of the present disclosure.

[0039] Figure 3 is a diagram illustrating one or more examples of sidelink discontinuous reception (DRX) operations according to various aspects of the present disclosure.

[0040] Figure 4-6 is a diagram illustrating an example of DRX operation for a Mode 1 sidelink according to various aspects of the present disclosure.

[0041] Figure 7 is a diagram illustrating one or more examples of side link configured grant usage based at least in part on a connectivity mode change in accordance with various aspects of the present disclosure.

[0042] Figure 8 is a diagram illustrating one or more examples of maintaining a connectivity mode based at least in part on sidelink activity in accordance with various aspects of the present disclosure.

[0043] Figure 9-11 is a diagram illustrating example processes performed, for example, by a UE according to various aspects of the present disclosure.

[0044] Fig.12 is a diagram illustrating example processes performed, for example, by a BS according to various aspects of the present disclosure.

[0045] Fig.13 is a diagram illustrating example processes performed, for example, by a UE according to various aspects of the present disclosure.

[0046] Fig.14 is a diagram illustrating example processes performed, for example, by a BS according to various aspects of the present disclosure.

[0047] Detailed Description

[0048] The 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 given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or 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 devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as 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.

[0049] 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, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0050] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0051] Figure 11 is a diagram illustrating 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 several 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, NR BS, B node, gNB, 5G B node (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0052] 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 subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by 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 1 In the example shown in , 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. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0053] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to 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, and / or the like using any suitable transport network.

[0054] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions 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. Figure 1 In the example shown in , 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.

[0055] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, 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 high transmit power level (e.g., 5 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 to 2 watts).

[0056] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0057] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. 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, 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 equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0058] Some UEs may be considered as machine type communication (MTC) UEs, 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., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like.

[0059] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may 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 may be deployed.

[0060] 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) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, 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.

[0061] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0062] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1One for each base station and one for each UE in the base station 110. 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.

[0063] 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) the 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)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may 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 may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0064] 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 where 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.

[0065] 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 as well as 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 sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a 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.

[0066] 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 base station 110 may perform one or more techniques associated with discontinuous reception (DRX) operation for the mode 1 side link, 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 Fig. 9 The process of 900 Fig.10 The process of 1000 Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 Process 1300, Fig.14 1400, and / or operations of 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 include: 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 base station 110 and / or UE 120, may perform or direct, for example, Fig. 9 The process of 900 Fig.10 The process of 1000 Fig.11 Process 1100, Fig.12 The process 1200 Fig.13 Process 1300, Fig.14 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0067] In some aspects, UE 120 may include: means for receiving a sidelink configured grant from a base station on an access link; means for transitioning to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant; means for communicating with another UE 120 on the sidelink using the sidelink configured grant while in the idle mode or inactive mode on the access link; etc. In some aspects, UE 120 may include: means for transmitting an indication to BS 110 to suspend an inactivity timer when requesting a sidelink communication grant; means for receiving a sidelink configured grant from a base station on the access link from BS 110 based at least in part on transmitting the indication; means for suspending the access link inactivity timer based at least in part on receiving the sidelink configured grant with a suspension indication so that UE 120 refrains from transitioning to the idle mode or the inactive mode on the access link; etc. In some aspects, UE 120 may include: a device for transmitting a request to BS 110 for radio resources for transmitting sidelink communications to another UE 120 on a sidelink; a device for receiving from BS 110 an indication of timing for retransmitting the request for radio resources to BS 110 based at least in part on transmitting the request for radio resources, wherein the indication of timing is based at least in part on the other UE 120 being in a sidelink discontinuous reception sleep mode; and the like. In some aspects, UE 120 may include: means for transmitting a request to BS 110 to synchronize access link DRX operation and side link DRX operation of the UE; means for receiving an indication of an access link DRX configuration and a side link DRX configuration from BS 110 based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of UE 120; means for performing at least one of: performing access link communication with BS 110 based at least in part on the access link DRX configuration, or performing side link communication with another UE 120 based at least in part on the side link DRX configuration; and so on. 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, and the like.

[0068] In some aspects, BS 110 may include: means for receiving a request from a first UE 120 for radio resources for transmitting sidelink communications to a second UE 120 on a sidelink; means for determining that the second UE 120 is in a sidelink DRX sleep mode; means for transmitting to the first UE 120 an indication of timing for retransmitting the request for radio resources to the BS 110 or an indication of a sidelink grant for a time period during which the second UE 120 is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE 120 is in the sidelink DRX sleep mode; and the like. In some aspects, BS 110 may include: means for configuring an access link DRX configuration and a sidelink DRX configuration for UE 120 such that the access link DRX configuration and the sidelink DRX configuration synchronize access link DRX operation and sidelink DRX operation of UE 120; means for transmitting to UE 120 an indication of the access link DRX configuration and the sidelink DRX configuration; and the like. In some aspects, such means may include means for combining Figure 2 One or more components of BS 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.

[0069] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0070] Figure 3 300 is a diagram illustrating one or more examples of sidelink DRX operations according to various aspects of the present disclosure. In some cases, a UE may perform DRX operations for an access link between the UE and a BS to protect the battery life of the UE. The DRX operations may include transitioning to a DRX sleep mode for a DRX sleep duration. In the DRX sleep mode, the UE may suppress transmission or reception on the access link, may deactivate specific subcarriers or component carriers of the access link (e.g., in the case of implementing carrier aggregation on the access link), may deactivate one or more components of the UE, and the like. In addition, the DRX operations may include periodically transitioning out of the DRX sleep mode and transitioning to a DRX on mode (or activation mode) for a DRX on duration to monitor downlink communications from the BS. In some cases, the BS may transmit instructions to the UE for performing DRX operations, transitioning to a DRX sleep mode, and the like.

[0071] In some cases, a UE may be configured to communicate with another UE on a sidelink (or an integrated access and backhaul (IAB) node may be configured to communicate with another IAB node on a sidelink), which may be referred to as sidelink communication. In some cases, a UE may be configured to perform DRX operations on a sidelink. Example(s) 300 may illustrate examples of sidelink DRX operations of a UE (e.g., UE 120). Other configuration examples may be used for sidelink DRX operations of a UE.

[0072] like Figure 3 As shown in , the UE may perform sidelink DRX operations in various sidelink connectivity modes, such as a sidelink connected mode (e.g., a radio resource control (RRC) connected mode on one or more sidelinks) and a sidelink idle mode (e.g., an RRC idle mode). In some aspects, the UE may perform sidelink DRX operations in other sidelink connectivity modes, such as a sidelink inactive mode (e.g., an RRC inactive mode on one or more sidelinks), etc.

[0073] like Figure 3 As further shown in , the UE may initiate sidelink DRX operation based at least in part on the expiration of the sidelink DRX inactivity timer. In some aspects, the UE may initiate sidelink DRX operation before the expiration of the sidelink DRX inactivity timer, such as based at least in part on the expiration of the sidelink inactivity timer (e.g., which may cause the UE to transition from a sidelink connected mode to a sidelink idle mode), based at least in part on the operation of another UE, and the like.

[0074] In some aspects, the UE may determine whether the sidelink DRX inactivity timer has expired based at least in part on a time duration since the UE last transmitted and / or received a sidelink communication. For example, the UE may determine that the sidelink DRX inactivity timer has expired based at least in part on not transmitting and / or receiving sidelink communications during the time duration, based at least in part on transmitting and / or receiving a sidelink communication volume that does not meet a threshold amount during the time duration, and / or the like.

[0075] Similarly, the UE may determine whether the sidelink inactivity timer has expired based at least in part on the time duration since the UE last transmitted and / or received a sidelink communication. The time duration associated with the sidelink inactivity timer may be different (e.g., longer) relative to the time duration associated with the sidelink DRX inactivity timer. For example, the UE may determine that the sidelink inactivity timer has expired based at least in part on not transmitting and / or receiving sidelink communications during the time duration, based at least in part on transmitting and / or receiving a sidelink communication volume that does not meet a threshold amount during the time duration, and the like.

[0076] like Figure 3As further shown in , the UE may perform sidelink DRX operations based at least in part on a sidelink DRX cycle. The sidelink DRX cycle may include a combination of a sidelink DRX on mode and a sidelink DRX sleep mode. The UE may operate in the sidelink DRX sleep mode for a sidelink DRX sleep duration. In the sidelink DRX sleep mode, the UE may suppress transmission or reception on the sidelink, may deactivate specific subcarriers or component carriers of the sidelink (e.g., in the case of implementing carrier aggregation on the sidelink), may deactivate one or more components of the UE, and the like. In addition, the UE may operate in the sidelink DRX on mode for a sidelink DRX on duration to monitor sidelink communications from other UEs, to transmit sidelink communications to other UEs, and the like. The combination of the sidelink DRX sleep duration and the sidelink DRX on duration may be referred to as the sidelink DRX cycle duration of the sidelink DRX cycle. On the other hand, a UE in the sidelink DRX sleep mode may be active on the access link to transmit and receive. The UE may also use the sidelink for other purposes, such as additional measurements and / or testing.

[0077] like Figure 3 As further shown in , the sidelink DRX operation of the UE may include various types of sidelink DRX cycles, such as a short sidelink DRX cycle, a long sidelink DRX cycle, and the like. The sidelink DRX cycle duration of the short sidelink DRX cycle may be relatively short relative to the sidelink DRX cycle duration of the long sidelink DRX cycle. As an example, the short DRX cycle duration may be 5 subframes and the long DRX cycle duration may be 10 subframes. In some aspects, the UE may transition from the short sidelink DRX cycle to the long sidelink DRX cycle based at least in part on not transmitting and / or receiving sidelink communications for a particular number of consecutive sidelink DRX on mode durations.

[0078] In some aspects, the sidelink DRX cycle duration, the sidelink DRX on duration, and / or the sidelink DRX sleep duration of the sidelink DRX operation of the UE may be the same or different between the sidelink connected mode and the sidelink idle mode. For example, the sidelink DRX sleep mode duration may be longer in the sidelink idle mode relative to the sidelink connected mode, in which case fewer sidelink DRX on durations may be scheduled for a given time period in the sidelink idle mode relative to the sidelink connected mode.

[0079] As indicated above, Figure 3 is provided as one or more examples. Other examples may differ from the Figure 3 Examples described.

[0080] In some cases, the serving BS of the UE may schedule access link communications on an access link between the BS and the UE, may schedule side link communications on a side link between the UE and another UE, and so on (e.g., this may be referred to as mode 1 side link operation). In addition, the UE may be configured to perform side link DRX operations on the side link and to perform access link DRX operations on the access link. However, the side link DRX operations and access link DRX operations of the UE may not be coordinated so that the UE performs side link DRX operations and access link DRX operations asynchronously and / or independently. This may cause misalignment between the side link DRX sleep mode and the access link DRX sleep mode, misalignment between the side link DRX on mode and the access link DRX on mode, and / or misalignment between the side link DRX cycle and the access link DRX cycle, which may reduce the battery life protection provided by the side link DRX operations and the access link DRX operations, or cause communication delays when the side link operations require control signaling on the access link.

[0081] Some aspects described herein provide techniques and apparatus for DRX operation of a mode 1 sidelink. In some aspects, a BS may configure a sidelink DRX configuration for a sidelink DRX operation of a UE and an access link DRX configuration for the sidelink DRX operation of the UE. The UE may perform sidelink communication with another UE based at least in part on the sidelink DRX configuration and / or may perform access link communication with the BS based at least in part on the access link DRX configuration. The BS may configure the sidelink DRX configuration and the access link DRX configuration so that the sidelink DRX configuration and the access link DRX configuration synchronize the sidelink DRX operation and the access link DRX operation of the UE, which improves the efficiency of the sidelink DRX operation and the access link DRX operation of the UE, increases the amount of time the UE is allowed to operate in the sidelink DRX sleep mode and the access link DRX sleep mode (e.g., this increases the battery life protection of the UE), and the like.

[0082] In some aspects, the UE may transmit to the BS a request for radio resources for transmitting sidelink communications to another UE. The BS may receive the request and may determine that the other UE is operating in a sidelink DRX sleep mode. The BS may cause the other UE to terminate the sidelink DRX operation and may transmit to the UE an indication of the timing for retransmitting the request for radio resources to the BS. In this way, the other UE may terminate the sidelink DRX operation so that the other UE is ready and can be used to receive sidelink communications from the UE, which reduces the possibility that the other UE may be in a sidelink DRX sleep mode when the UE transmits sidelink communications to the other UE. This increases the possibility that the sidelink communication will be successfully received at the other UE, reduces discarded sidelink communications, and the like. In addition, in this way, the UE knows the timing for retransmitting the request for radio resources, which reduces the number of requests transmitted by the UE to the BS, which in turn reduces resource consumption on the access link between the UE and the BS.

[0083] In some cases, the UE may receive a sidelink configured grant from the BS. The sidelink configured grant may identify a periodic and / or semi-persistent set of time domain resources and / or a set of frequency domain resources that the UE may use to perform sidelink communications with another UE. After receiving the sidelink configured grant, the UE may transition from a connected mode on an access link with the BS to an idle mode or an inactive mode on the access link, which may cause the sidelink configured grant to be invalidated for the UE. In this case, the UE may no longer be permitted to use the sidelink configured grant for sidelink communications of the UE, which may cause the sidelink communications between the UE and another UE to be interrupted.

[0084] Some aspects described herein provide techniques and apparatus for using a sidelink configured grant based at least in part on a change in connectivity mode. In some aspects, a UE may continue to use a sidelink configured grant to perform sidelink communications with another UE when the UE is in an idle mode or an inactive mode. In this way, the UE is allowed to continue to use the sidelink configured grant when it is no longer in a connected mode on an access link with a BS, when the UE moves between different cellular cells, etc., which reduces and / or prevents interruptions in sidelink communications between the UE and another UE.

[0085] In some cases, the UE may be relatively inactive on the access link between the UE and the BS. For example, traffic to and / or from the UE may be sporadic and / or infrequent. In some cases, an access link inactivity timer associated with an access link may expire due to the sporadic and / or infrequent nature of traffic to and / or from the UE on the access link. The expiration of the access link inactivity timer may cause the UE to transition to an idle mode or an inactive mode on the access link, which may cause the side link to be configured and granted to be invalidated for the UE. In this case, the UE may no longer be allowed to use the side link to be configured and granted to communicate with another UE on the side link, which may cause the side link communication between the UE and the other UE to be interrupted.

[0086] Some aspects described herein provide techniques and devices for maintaining a connectivity mode based at least in part on sidelink activity. In some aspects, a UE may be permitted to actually suspend an access link inactivity timer associated with an access link between the UE and a BS so that the UE is permitted to continue to communicate with another UE on the sidelink as configured by the sidelink. This reduces and / or prevents the possibility that the expiration of the access link inactivity timer will result in a disruption of the sidelink communication between the UE and the other UE.

[0087] Figure 4 is a diagram illustrating one or more examples 400 of DRX operation for a mode 1 sidelink in accordance with various aspects of the present disclosure. Figure 4 As shown in , example(s) 400 may include sidelink communications between multiple UEs (e.g., UE 120) such as UE 1 and UE 2, and access link communications between a UE (e.g., UE 1) and a BS (e.g., BS 110). In some aspects, UE 1 may be communicatively connected to the BS via an access link and may be communicatively connected to UE 2 via a sidelink.

[0088] like Figure 4 4 and indicated by reference numeral 402, the BS may configure a sidelink DRX configuration for a sidelink DRX operation of UE1 on the sidelink, and may configure an access link DRX configuration for an access link DRX operation of UE1 on the access link.

[0089] In some aspects, the sidelink DRX configuration may identify one or more parameters for sidelink DRX operation of UE1, such as a sidelink DRX inactivity timer, a start time of a sidelink DRX sleep mode (e.g., a time slot and / or orthogonal frequency division multiplexing (OFDM) symbol in which the sidelink DRX sleep mode is to start), a sidelink DRX sleep duration of the sidelink DRX sleep mode, a start time of a sidelink DRX on mode (e.g., a time slot and / or symbol in which the sidelink DRX on mode is to start), a sidelink DRX on duration of the sidelink DRX on mode, a sidelink DRX cycle duration, a configuration of a short sidelink DRX cycle and / or a long sidelink DRX cycle for UE1, one or more subcarriers or component carriers to be disabled and / or deactivated by UE1 when UE1 is in the sidelink DRX sleep mode, and the like.

[0090] In some aspects, the access link DRX configuration may identify one or more parameters for access link DRX operation of UE1, such as an access link DRX inactivity timer, a start time of an access link DRX sleep mode (e.g., a time slot and / or symbol in which the access link DRX sleep mode is to start), an access link DRX sleep duration of the access link DRX sleep mode, a start time of an access link DRX on mode (e.g., a time slot and / or symbol in which the access link DRX on mode is to start), an access link DRX on duration of the access link DRX on mode, an access link DRX cycle duration, a configuration of a short access link DRX cycle and / or a long access link DRX cycle for UE1, one or more subcarriers or component carriers to be disabled and / or deactivated by UE1 when UE1 is in the access link DRX sleep mode, and the like.

[0091] In some aspects, the BS may configure the sidelink DRX configuration and the access link DRX configuration so that the sidelink DRX configuration and the access link DRX configuration synchronize the sidelink DRX operation and the access link DRX operation of the UE. For example, the UE may transmit a request to the BS to synchronize the sidelink DRX operation and the access link DRX operation of the UE. The BS may receive the request and configure the sidelink DRX configuration and the access link DRX configuration so that UE1 can remain in a connected mode on the access link when UE1 is active on the sidelink (e.g., when the sidelink inactivity timer has not expired) and / or remain in a connected mode on the sidelink when UE1 is active on the access link (e.g., when the access link inactivity timer has not expired). The UE request may be included in RRC signaling, such as in a SidelinkUEInformation information element or communication when indicating a sidelink transmission recipient associated with the UE, in a UEAssistanceInformation information element or communication when reporting a traffic mode, and so on.

[0092] As another example, the BS may configure the sidelink DRX configuration and the access link DRX configuration so that UE1 enters sidelink DRX operation and access link DRX operation based at least in part on the expiration of both the sidelink DRX inactivity timer and the access link DRX inactivity timer. In addition, the BS may configure the sidelink DRX configuration and the access link DRX configuration so that one or more parameters for the sidelink DRX operation and one or more parameters for the access link DRX operation are the same parameters. In this case, the BS may configure the start time of the sidelink DRX sleep mode and the start time of the access link DRX sleep mode to be the same start time (for example, so that UE1 transitions to the sidelink DRX sleep mode and the access link DRX sleep mode at the same start time), configure the sidelink DRX sleep duration and the access link DRX sleep duration to be the same duration (for example, so that UE1 remains in the sidelink DRX on mode and the access link DRX on mode for the same duration), configure the start time of the sidelink DRX on mode and the start time of the access link DRX on mode to be the same start time (for example, , so that UE1 transitions to sidelink DRX on mode and access link DRX on mode at the same start time), configuring the sidelink DRX on duration and the access link DRX on duration to be the same duration (e.g., so that UE1 remains in sidelink DRX on mode and access link DRX on mode for the same duration), configuring the sidelink DRX cycle duration and the access link DRX cycle duration to be the same duration (e.g., so that UE1 cycles through sidelink DRX sleep mode, sidelink DRX on mode, access link DRX sleep mode, and access link DRX on mode at the same cadence), etc. In this way, UE1 can perform sidelink DRX operation and access link DRX operation in a synchronized manner, which increases the amount of time UE1 is permitted to operate in DRX sleep mode, which increases battery life protection for UE1.

[0093] like Figure 4 , and further indicated by reference numeral 404, the BS may transmit an indication of the sidelink DRX configuration and the access link DRX configuration to UE1. In some aspects, the indication may be included in a media access control control element (MAC-CE) communication, a downlink control information (DCI) communication, an RRC communication, and / or another type of downlink communication. In some aspects, UE1 may receive the indication of the sidelink DRX configuration and the access link DRX configuration based at least in part on transmitting a request to the BS to synchronize the sidelink DRX operation and the access link DRX operation of UE1.

[0094] like Figure 4, and further indicated by reference numeral 406, UE1 may perform sidelink communication with UE2 based at least in part on the sidelink DRX configuration and / or may perform access link communication with the BS based at least in part on the access link DRX configuration. For example, UE1 may initiate sidelink DRX operation and access link DRX operation based at least in part on the expiration of the sidelink DRX inactivity timer and the access link DRX inactivity timer. As another example, UE1 may transition to the sidelink DRX sleep mode and the access link DRX sleep mode at the same start time. As another example, when UE1 is in the sidelink DRX sleep mode and the access link DRX sleep mode, it may suppress monitoring of sidelink communications (e.g., physical sidelink control channel (PSCCH) communications, physical sidelink shared channel (PSSCH) communications, physical sidelink broadcast channel (PSBCH) communications, and / or other types of sidelink communications) and / or downlink communications (e.g., physical downlink control channel (PDCCH) communications, physical downlink shared channel (PDSCH) communications, physical broadcast channel (PBCH) communications, etc.), may disable and / or deactivate one or more component carriers configured for sidelink communications and / or access link communications, may disable and / or deactivate one or more components of UE1 (e.g., one or more transmit chain components, one or more receive chain components, etc.), etc.

[0095] In some aspects, once the sidelink DRX sleep duration and the access link DRX sleep duration expire (e.g., both may be the same duration), UE1 may transition from the sidelink DRX sleep mode to the sidelink DRX on mode for the sidelink DRX on duration and to the access link DRX on mode for the access link on duration (e.g., both may be the same duration). In this case, UE1 may monitor sidelink communications (e.g., PSCCH communications, PSSCH communications, PSBCH communications, sidelink broadcast communications, sidelink multicast communications, etc.) from UE2 and / or downlink communications (e.g., PDCCH communications, PDSCH communications, PBCH communications, etc.) from the BS when UE1 is in the sidelink DRX on mode and the access link DRX on mode.

[0096] In some aspects, UE1 may terminate UE1's sidelink DRX operation by transmitting sidelink communications while UE1 is in sidelink DRX on mode. In this case, terminating UE1's sidelink DRX operation causes UE1 to also terminate UE1's access link DRX operation. Similarly, terminating UE1's access link DRX operation causes UE1 to also terminate UE1's sidelink DRX operation.

[0097] In this way, the BS may configure a sidelink DRX configuration for the sidelink DRX operation of UE1 and an access link DRX configuration for the sidelink DRX operation of UE1. UE1 may perform sidelink communication with UE2 based at least in part on the sidelink DRX configuration and / or may perform access link communication with the BS based at least in part on the access link DRX configuration. The BS may configure the sidelink DRX configuration and the access link DRX configuration so that the sidelink DRX configuration and the access link DRX configuration synchronize the sidelink DRX operation and the access link DRX operation of UE1, which improves the efficiency of the sidelink DRX operation and the access link DRX operation of UE1, increases the amount of time that UE1 is permitted to operate in the sidelink DRX sleep mode and the access link DRX sleep mode (e.g., this increases battery life protection of UE1), and the like.

[0098] As indicated above, Figure 4 is provided as one or more examples. Other examples may differ from the Figure 4 Examples described.

[0099] Figure 5 is a diagram illustrating one or more examples 500 of DRX operation for a mode 1 sidelink in accordance with various aspects of the present disclosure. In some aspects, example(s) 500 may illustrate examples of sidelink DRX operation of one or more UEs (eg, UE 120).

[0100] like Figure 5 As shown in , the UE may be configured to perform sidelink DRX operations based at least in part on a sidelink DRX configuration, which is based at least in part on the travel speed of the UE. The UE may be configured with multiple sidelink DRX configurations, wherein each of the multiple sidelink DRX configurations is associated with a corresponding speed range. For example, a first sidelink DRX configuration may be associated with a speed range 1 (e.g., 21-30 kilometers per hour (km / hr)), a second sidelink DRX configuration may be associated with a speed range 2 (e.g., 31-40km / hr), a third sidelink DRX configuration may be associated with a speed range 3 (e.g., 41-50km / hr), and so on. The UE may perform sidelink operations based at least in part on a sidelink DRX configuration associated with a speed range including the travel speed of the UE.

[0101] In some aspects, each of the plurality of sidelink DRX configurations may be associated with one or more different sidelink DRX operating parameters. This permits UEs associated with similar travel modes (e.g., UEs associated with traveling by vehicle, UEs associated with traveling by bicycle, etc.) to coordinate and / or synchronize sidelink DRX operations. Figure 5As shown in , for example, the start time of the sidelink DRX cycle for each speed range may be staggered in the time domain by a time duration T Δ In some aspects, T Δ The same may be true for each speed range (e.g., the sidelink DRX cycles for each speed range may be staggered by the same time duration). In some aspects, T Δ The sidelink DRX cycles for one or more speed ranges may be different (e.g., the sidelink DRX cycles for one or more speed ranges may be staggered with different time durations). In some aspects, other parameters for sidelink DRX operation (such as the start time of the sidelink DRX on mode, the start time of the sidelink DRX sleep duration, the sidelink DRX on duration, the sidelink DRX sleep duration, the sidelink DRX cycle duration, etc.) may be the same or different across one or more speed ranges.

[0102] As indicated above, Figure 5 is provided as one or more examples. Other examples may differ from the Figure 5 Examples described.

[0103] Figure 6 is a diagram illustrating one or more examples 600 of DRX operation for a Mode 1 sidelink in accordance with various aspects of the present disclosure. Figure 6 As shown in, example(s) 600 may include sidelink communications between multiple UEs (e.g., UE120) (such as UE1 and UE2), and access link communications between UE (e.g., UE1) and BS (e.g., BS 110). In some aspects, UE1 and UE2 may be communicatively connected to the BS via respective access links. In some aspects, UE1 and UE2 may be communicatively connected via sidelinks.

[0104] In some aspects, the BS may configure UE1 to perform sidelink DRX operation by transmitting an indication of the sidelink DRX configuration to UE1. UE1 may perform the sidelink DRX operation based at least in part on the sidelink DRX configuration. The sidelink DRX operation may identify one or more parameters for the sidelink DRX operation of UE1, such as the one or more parameters for the sidelink DRX operation described above.

[0105] like Figure 6 1 and indicated by reference numeral 602, UE2 may be configured to transmit sidelink communications to UE1, and may transmit to the BS a request for radio resources for transmitting the sidelink communications to UE2. The radio resources may include time domain resources (e.g., one or more time slots, one or more OFDM symbols, etc.) and / or frequency domain resources (e.g., one or more subcarriers, etc.) in which the sidelink communications are transmitted to UE2.

[0106] In some aspects, the request may include a buffer status report and / or another type of indication that UE2 is buffering data to be transmitted to UE1. UE2 may transmit the buffer status report in an uplink communication such as a MAC-CE, an uplink control information (UCI) communication, and / or another type of uplink communication.

[0107] like Figure 6 In and further indicated by reference numeral 604, the BS may receive the request and may determine that UE1 is in the sidelink DRX sleep mode. For example, the BS may determine that UE1 is in the sidelink DRX sleep mode based at least in part on the sidelink DRX configuration configured by the BS for UE1.

[0108] like Figure 6 , and further indicated by reference numeral 606, the BS may transmit a sidelink DRX end command to UE1 to cause UE1 to terminate the sidelink DRX operation of UE1. In some aspects, the BS may transmit the sidelink DRX end command to UE1 based at least in part on determining that UE1 is in a sidelink DRX sleep mode and UE2 is buffering data to be transmitted to UE1.

[0109] In some aspects, the BS may transmit a sidelink DRX end command to UE1 when UE1 is in the sidelink DRX on mode (e.g., after UE1 has transitioned out of the sidelink DRX on mode). In some aspects, UE1 may receive the sidelink DRX end command from the BS and terminate other sidelink DRX operations of UE1 so that UE1 can prepare to receive data being buffered by UE2. In some aspects, UE1 may perform sidelink communications with one or more other UEs. In this case, UE1 may be configured with a corresponding sidelink DRX configuration for each of the other UEs. The sidelink DRX end command may trigger UE1 to terminate sidelink DRX operations with other UEs and prepare to receive data from UE2.

[0110] like Figure 6 In the embodiment and further shown by reference numeral 608, the BS may transmit to UE2 an indication of a timing for retransmitting a request for radio resources (e.g., a request for radio resources for transmitting buffered data to UE1 in a sidelink communication) to the BS. In some aspects, the BS may transmit the indication in a MAC-CE communication, a DCI communication, an RRC communication, and / or another type of downlink communication. The indication of the timing for retransmitting the request may identify a specific time slot, OFDM symbol, etc., in which UE2 may retransmit the request for radio resources to the BS.

[0111] In some aspects, the BS may transmit to UE2 an indication of a sidelink grant for a time period in which UE1 is no longer in the sidelink DRX sleep mode, so that UE2 may transmit sidelink communications to UE1 during the time period, may request radio resources for transmitting sidelink communications to UE1 during the time period, etc. In some aspects, the sidelink grant may be included in a DCI communication, an RRC communication, a MAC-CE communication, etc.

[0112] In some aspects, UE2 may receive an indication of timing for retransmitting the request for radio resources and may retransmit the request to the BS based at least in part on the indication. The BS may receive the retransmission of the request, may determine that UE1 has terminated sidelink DRX operation and is ready to receive data buffered at UE2, and may transmit a sidelink grant to UE2. The sidelink grant may identify radio resources that UE2 may use to transmit buffered data to UE1 in sidelink communications.

[0113] In this way, UE2 may transmit to the BS a request for radio resources for transmitting sidelink communications to UE1. The BS may receive the request and may determine that UE1 is operating in a sidelink DRX sleep mode. The BS may cause UE1 to terminate the sidelink DRX operation of UE1 and may transmit to UE2 an indication of the timing for retransmitting the request for radio resources to the BS. In this way, UE1 may terminate the sidelink DRX operation so that UE1 is ready and available for receiving sidelink communications from UE2, which reduces the possibility that UE1 may be in a sidelink DRX sleep mode when UE2 transmits sidelink communications to UE1. This increases the possibility that the sidelink communication will be successfully received at UE1, reduces discarded sidelink communications, and the like. In addition, in this way, UE2 knows the timing for retransmitting the request for radio resources, which reduces the number of requests transmitted by UE2 to the BS, which in turn reduces resource consumption on the access link between UE2 and the BS.

[0114] As indicated above, Figure 6 is provided as one or more examples. Other examples may differ from the Figure 6 Examples described.

[0115] Figure 7 is a diagram illustrating one or more examples 700 of sidelinks being configured for use based at least in part on a connectivity mode change in accordance with various aspects of the present disclosure. Figure 7As shown in , example(s) 700 may include sidelink communications between multiple UEs (e.g., UE 120) (such as UE1 and UE2), and access link communications between UE (e.g., UE1) and BS (e.g., BS 110). In some aspects, UE2 may be communicatively connected to the BS via an access link. In some aspects, UE1 and UE2 may be communicatively connected via a sidelink.

[0116] like Figure 7 , and indicated by reference numeral 702, the BS may transmit a sidelink configured grant to UE2. A sidelink configured grant may also be referred to as a type 1 grant (e.g., a grant configured and activated by RRC) and may identify a set of periodic and / or semi-persistent time-domain resources and / or a set of frequency-domain resources that UE2 may use to transmit sidelink communications to UE1 and / or receive sidelink communications from UE1 on the sidelink.

[0117] like Figure 7 , and further indicated by reference numeral 704, UE2 may transition to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant. In this case, UE2 may suspend the RRC configuration for the access link (e.g., in the case of transitioning to the inactive mode) or release the RRC connection with the BS (e.g., in the case of transitioning to the idle mode) so that UE2 and the BS are no longer in a connected mode on the access link. In some aspects, UE2 may determine to transition to an idle mode or an inactive mode based at least in part on receiving an instruction from the BS, based at least in part on the expiration of an access link inactivity timer, and the like.

[0118] like Figure 7 , and further indicated by reference numeral 706, UE2 may use the sidelink configured grant when in an idle mode or an inactive mode to perform sidelink communications with UE1. For example, UE2 may transmit sidelink communications to UE1 in a periodic and / or semi-persistent set of time domain resources and / or a set of frequency domain resources identified by the sidelink configured grant, may receive sidelink communications from UE1 in a periodic and / or semi-persistent set of time domain resources and / or a set of frequency domain resources identified by the sidelink configured grant, and so on.

[0119] In some aspects, the BS may configure a sidelink configured grant for a specific radio access network (RAN) notification area (RNA). In this case, UE2 may use the sidelink configured grant to perform sidelink communications with UE1 when UE2 is located in the RNA. Upon request from UE2, the BS may retain the sidelink configured grant for a specific period of time, even if UE2 enters RRC idle mode on the access link.

[0120] In some aspects, UE2 may perform sidelink communication with UE1 using the sidelink configured grant when in idle mode or inactive mode based at least in part on being configured to perform sidelink communication using the sidelink configured grant when in idle mode or inactive mode, based at least in part on receiving from the BS permission for UE2 to perform sidelink communication using the sidelink configured grant when in idle mode or inactive mode, and so on.

[0121] In this way, when UE2 is no longer in connected mode on the access link with the BS, when UE2 moves between different cells, UE2 is allowed to continue to use the sidelink configured grant for a time period indicated by the BS together with the sidelink configured grant, etc. When UE2 moves outside the RNA area, UE2 can signal the BS or another BS to release the old sidelink configured grant, or update it with a new sidelink configured grant in the new area for continued sidelink communication. Such signaling can be via RRC communication, MAC CE communication, etc.

[0122] As indicated above, Figure 7 is provided as one or more examples. Other examples may differ from the Figure 7 Examples described.

[0123] Figure 8 8 is a diagram illustrating one or more examples 800 of maintaining a connectivity mode based at least in part on side link activity in accordance with various aspects of the present disclosure. Figure 8 As shown in , (all) examples 800 may include side link communications between multiple UEs (e.g., UE120) (such as UE1 and UE2), and access link communications between UE (e.g., UE1) and BS (e.g., BS 110). In some aspects, UE2 may be communicatively connected to the BS via an access link. In some aspects, UE1 and UE2 may be communicatively connected via a side link.

[0124] like Figure 8 8 and indicated by reference numeral 802, the BS may transmit a sidelink configured grant to UE2. A sidelink configured grant may also be referred to as a type 1 grant (e.g., a grant configured and activated by RRC) and may identify a set of periodic and / or semi-persistent time-domain resources and / or a set of frequency-domain resources that UE2 may use to transmit and / or receive sidelink communications to and / or from UE1 on the sidelink.

[0125] In some cases, UE2 may be relatively inactive on the access link. For example, traffic to and / or from UE2 may be sporadic and / or infrequent. In some cases, an access link inactivity timer associated with an access link may expire due to the sporadic and / or infrequent nature of traffic to and / or from UE2 on the access link. In the case where the access link inactivity timer expires and UE2 transitions to an idle mode or inactive mode on the access link, this may cause the side link configured grant to be invalidated for UE2. In this case, UE2 may no longer be allowed to use the side link configured grant to carry out side link communication of UE2, which may cause the side link communication between UE2 and UE1 to be interrupted.

[0126] like Figure 8 In the figure and further shown by reference numeral 804, in order to reduce the interruption of the side link communication between UE2 and UE1, UE2 may suspend the access link inactivity timer for the access link so that UE2 suppresses the transition to the idle mode or the inactive mode on the access link. This can reduce and / or prevent the interruption of the side link communication between UE2 and UE1 caused by the invalidation of the side link configured grant for UE2 due to the transition of UE2 to the idle mode or the inactive mode on the access link.

[0127] In some aspects, UE2 may suspend the access link inactivity timer based at least in part on determining that the side link inactivity timer associated with the side link has not expired. In some aspects, UE2 may suspend the access link inactivity timer based at least in part on being configured to suspend the access link inactivity timer when a valid side link is configured to be granted, based at least in part on receiving a grant from the BS regarding granting UE2 to suspend the access link inactivity timer, and the like.

[0128] In some aspects, UE2 may suspend the access link inactivity timer based at least in part on the sidelink configured grant including a suspension indication (which may be an indication that UE2 is to suspend the access link inactivity timer). UE2 may receive the sidelink configured grant with the suspension indication based at least in part on transmitting an indication to the BS to suspend the inactivity timer when requesting the sidelink communication grant.

[0129] like Figure 8 UE2 may use the sidelink configured grant to perform sidelink communications with UE1. For example, UE2 may transmit sidelink communications to UE1 in a periodic and / or semi-persistent set of time domain resources and / or a set of frequency domain resources identified by the sidelink configured grant, may receive sidelink communications from UE1 in a periodic and / or semi-persistent set of time domain resources and / or a set of frequency domain resources identified by the sidelink configured grant, and so on.

[0130] In this way, UE2 is allowed to suspend the access link inactivity timer associated with the access link between UE2 and the BS so that UE2 is allowed to continue to use the side link configured grant to communicate with UE1. This reduces and / or prevents the possibility that the expiration of the access link inactivity timer will cause the side link communication between UE2 and UE1 to be interrupted.

[0131] As indicated above, Figure 8 is provided as one or more examples. Other examples may differ from the Figure 8 Examples described.

[0132] Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 900 is an example of operations in which a UE (eg, UE 120) performs operations associated with sidelink configured grants based at least in part on a connectivity mode change.

[0133] like Fig. 9 As shown in , in some aspects, process 900 may include: receiving a sidelink configured grant from a base station on an access link (block 910). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may receive a sidelink configured grant from a base station on an access link, as described above.

[0134] like Fig. 9 As further shown in FIG. 9 , in some aspects, process 900 may include transitioning to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant (block 920). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may transition to an idle mode or an inactive mode on the access link after receiving the sidelink configured grant, as described above.

[0135] like Fig. 9 As further described in , in some aspects, process 900 may include: communicating with another UE on the sidelink using the configured grants of the sidelink while in an idle mode or an inactive mode on the access link (block 930). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may communicate with another UE on the sidelink using the configured grants of the sidelink while in an idle mode or an inactive mode on the access link, as described above.

[0136] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0137] In a first aspect, communicating with the other UE on the side link using a side link configured grant while in an idle mode or inactive mode on an access link includes: communicating with the other UE on the side link using the side link configured grant while located in a specific RNA and within a time period indicated by the base station together with the side link configured grant. In a second aspect, either alone or in combination with the first aspect, process 900 includes: transitioning to an active mode on the access link; transmitting an indication of suspending an inactivity timer to the base station when requesting a side link communication grant; and receiving another side link configured grant with a suspension indication from the base station on the access link based at least in part on transmitting the indication. In a third aspect, either alone or in combination with one or more of the first or second aspects, process 900 includes: suspending the access link inactivity timer based at least in part on receiving the other side link configured grant with the suspension indication so that the UE suppresses transitioning back to an idle mode or inactive mode on the access link.

[0138] although Fig. 9 An example block diagram of process 900 is shown, but in some aspects, process 900 may include Fig. 9 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 900. Additionally or alternatively, two or more blocks of the process 900 may be executed in parallel.

[0139] Fig.10 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 of operations in which a UE (eg, UE 120) performs operations associated with maintaining a connectivity mode based at least in part on sidelink activity.

[0140] like Fig.10 As shown in , in some aspects, process 1000 may include: transmitting an indication of a suspended inactivity timer to the BS when requesting a sidelink communication grant (block 1010). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may transmit an indication of a suspended inactivity timer to the BS when requesting a sidelink communication grant, as described above.

[0141] like Fig.10As further shown in FIG. 1 , in some aspects, process 1000 may include receiving, from the BS, a sidelink configured grant with a suspend indication from the base station on the access link based at least in part on transmitting the indication (block 1020). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may receive, from the BS, a sidelink configured grant with a suspend indication from the base station on the access link based at least in part on transmitting the indication, as described above.

[0142] like Fig.10 As further shown in FIG. 1 , in some aspects, process 1000 may include: suspending an access link inactivity timer based at least in part on receiving the sidelink configured grant so that the UE refrains from transitioning to an idle mode or an inactive mode on the access link (block 1030). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may suspend an access link inactivity timer based at least in part on receiving the sidelink configured grant so that the UE refrains from transitioning to an idle mode or an inactive mode on the access link, as described above.

[0143] although Fig.10 An example block diagram of process 1000 is shown, but in some aspects, process 1000 may include Fig.10 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1000. Additionally or alternatively, two or more blocks of the process 1000 may be executed in parallel.

[0144] Fig.11 is a diagram illustrating an example process 1100 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 1100 is an example in which a UE (eg, UE 120) performs operations associated with DRX for a mode 1 sidelink.

[0145] like Fig.11 As shown in , in some aspects, process 1100 may include transmitting to the BS a request for radio resources for transmitting sidelink communications to another UE on the sidelink (block 1110). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may transmit to the BS a request for radio resources for transmitting sidelink communications to another UE on the sidelink, as described above.

[0146] like Fig.11As further shown in , in some aspects, process 1100 may include: receiving, from the BS, an indication of timing for retransmitting the request for radio resources to the BS based at least in part on transmitting the request for radio resources, wherein the indication of the timing is based at least in part on the other UE being in a sidelink discontinuous reception sleep mode (block 1120). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may receive, from the BS, an indication of timing for retransmitting the request for radio resources to the BS based at least in part on transmitting the request for radio resources, as described above. In some aspects, the indication of the timing is based at least in part on the other UE being in a sidelink discontinuous reception sleep mode.

[0147] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0148] In an aspect, the request for radio resources includes a buffer status report associated with the UE and an indication of the timing is included in a MAC-CE communication.

[0149] although Fig.11 An example block diagram of process 1100 is shown, but in some aspects, process 1100 may include Fig.11 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1100. Additionally or alternatively, two or more blocks of the process 1100 may be executed in parallel.

[0150] Fig.12 is a diagram illustrating an example process 1200, performed, for example, by a BS, in accordance with various aspects of the present disclosure. Example process 1200 is an example in which a BS (eg, BS 110) performs operations associated with DRX for a mode 1 sidelink.

[0151] like Fig.12 As shown in , in some aspects, process 1200 may include: receiving a request from a first UE for radio resources for transmitting sidelink communications to a second UE on a sidelink (block 1210). For example, the BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may receive a request from a first UE for radio resources for transmitting sidelink communications to a second UE on a sidelink, as described above.

[0152] like Fig.12As further shown in FIG. 1 , in some aspects, process 1200 may include determining that the second UE is in a sidelink DRX sleep mode (block 1220). For example, the BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may determine that the second UE is in a sidelink DRX sleep mode, as described above.

[0153] like Fig.12 As further shown in FIG. 1 , in some aspects, process 1200 may include: transmitting to the first UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period when the second UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE is in the sidelink DRX sleep mode (block 1230). For example, the BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit to the first UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period when the second UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the second UE is in the sidelink DRX sleep mode, as described above.

[0154] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0155] In a first aspect, the request for radio resources includes a buffer status report associated with the UE, the indication of timing is included in a MAC-CE communication, and the indication of sidelink grant is included in a downlink control information communication. In a second aspect, alone or in combination with the first aspect, the process 1200 further includes: transmitting a sidelink DRX end command to the second UE to cause the second UE to terminate the sidelink DRX operation of the second UE based at least in part on determining that the second UE is in a sidelink DRX sleep mode.

[0156] although Fig.12 An example block diagram of process 1200 is shown, but in some aspects, process 1200 may include Fig.12 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1200. Additionally or alternatively, two or more blocks of the process 1200 may be executed in parallel.

[0157] Fig.13 is a diagram illustrating an example process 1300 performed, for example, by a UE in accordance with various aspects of the present disclosure. Example process 1300 is an example in which a UE (eg, UE 120) performs operations associated with DRX for a mode 1 sidelink.

[0158] like Fig.13 As shown in , in some aspects, process 1300 may include transmitting a request to the BS to synchronize access link DRX operation and side link DRX operation of the UE (block 1310). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may transmit a request to the BS to synchronize access link DRX operation and side link DRX operation of the UE, as described above.

[0159] like Fig.13 As shown in , in some aspects, process 1300 may include: receiving an indication of an access link DRX configuration and a side link DRX configuration from the BS based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize access link DRX operation and side link DRX operation of the UE (block 1320). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) may receive an indication of the access link DRX configuration and the side link DRX configuration from the BS based at least in part on transmitting the request, as described above. In some aspects, the access link DRX configuration and the side link DRX configuration synchronize access link DRX operation and side link DRX operation of the UE.

[0160] like Fig.13 As further shown in FIG. 1 , in some aspects, process 1300 may include at least one of performing access link communications with the BS based at least in part on the access link DRX configuration, or performing side link communications with another UE based at least in part on the side link DRX configuration (block 1330). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may at least one of performing access link communications with the BS based at least in part on the access link DRX configuration, or performing side link communications with another UE based at least in part on the side link DRX configuration, as described above.

[0161] Process 1300 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0162] In a first aspect, performing access link communications with a BS based at least in part on an access link DRX configuration includes: maintaining access link DRX on mode based at least in part on determining that the UE is in side link DRX on mode. In a second aspect, either alone or in combination with the first aspect, at least one of the following: a side link DRX on mode duration identified in the side link DRX configuration and an access link DRX on mode duration identified in the access link DRX configuration are the same DRX on mode duration; a start time of the side link DRX on mode identified in the side link DRX configuration and a start time of the access link DRX on mode identified in the access link DRX configuration are the same DRX on mode start time; or a side link DRX cycle duration identified in the side link DRX configuration and an access link DRX cycle duration identified in the access link DRX configuration are the same DRX cycle duration.

[0163] In a third aspect, alone or in combination with one or more of the first and second aspects, performing sidelink communication with another UE based at least in part on the sidelink DRX configuration includes: maintaining a sidelink DRX on mode based at least in part on determining that the UE is in an access link DRX on mode. In a fourth aspect, alone or in combination with one or more of the first to third aspects, performing sidelink communication with another UE based at least in part on the sidelink DRX configuration includes: transitioning from a sidelink DRX sleep mode to a sidelink DRX on mode based at least in part on transitioning from an access link DRX sleep mode to an access link DRX on mode.

[0164] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, performing access link communications with a BS based at least in part on an access link DRX configuration includes transitioning from an access link DRX sleep mode to an access link DRX on mode based at least in part on a transition from a sidelink DRX sleep mode to a sidelink DRX on mode. In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, a start time of a sidelink DRX on mode identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE. In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, a sidelink DRX cycle duration identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE.

[0165] although Fig.13 Example blocks of process 1300 are shown, but in some aspects, process 1300 may include Fig.13 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1300. Additionally or alternatively, two or more blocks of the process 1300 may be executed in parallel.

[0166] Fig.14 is a diagram illustrating an example process 1400, performed, for example, by a BS, in accordance with various aspects of the present disclosure. Example process 1400 is an example in which a BS (eg, BS 110) performs operations associated with DRX for a mode 1 sidelink.

[0167] like Fig.14 As shown in , in some aspects, the process 1400 may include: configuring an access link DRX configuration and a side link DRX configuration for a UE so that the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE (block 1410). For example, the BS (e.g., using the transmit processor 220, the receive processor 238, the controller / processor 240, the memory 242, etc.) may configure the access link DRX configuration and the side link DRX configuration for the UE so that the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE, as described above.

[0168] like Fig.14 As further shown in FIG. 14 , in some aspects, process 1400 may include transmitting an indication of the access link DRX configuration and the sidelink DRX configuration to the UE (block 1420). For example, the BS (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit an indication of the access link DRX configuration and the sidelink DRX configuration to the UE, as described above.

[0169] Process 1400 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0170] In a first aspect, at least one of the following: the sidelink DRX on mode duration identified in the sidelink DRX configuration and the access link DRX on mode duration identified in the access link DRX configuration are the same DRX on mode duration; the start time of the sidelink DRX on mode identified in the sidelink DRX configuration and the start time of the access link DRX on mode identified in the access link DRX configuration are the same DRX on mode start time; or the sidelink DRX cycle duration identified in the sidelink DRX configuration and the access link DRX cycle duration identified in the access link DRX configuration are the same DRX cycle duration.

[0171] In a second aspect, either alone or in combination with the first aspect, a start time of a sidelink DRX on mode identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE. In a third aspect, either alone or in combination with one or more of the first and second aspects, a sidelink DRX cycle duration identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE.

[0172] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, process 1400 includes: receiving from a UE a request for radio resources for transmitting sidelink communications to another UE on a sidelink; determining that the other UE is in a sidelink DRX sleep mode; and transmitting to the UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period in which the other UE is no longer in the sidelink DRX sleep mode based at least in part on determining that the other UE is in the sidelink DRX sleep mode. In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the request for radio resources includes a buffer status report associated with the UE.

[0173] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, an indication of timing is included in a media access control control element communication. In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, an indication of sidelink grant is included in a downlink control information communication. In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, process 1400 includes: transmitting a sidelink DRX end command to the other UE to cause the other UE to terminate the sidelink DRX operation of the other UE based at least in part on determining that the other UE is in a sidelink DRX sleep mode.

[0174] although Fig.14 Example blocks of process 1400 are shown, but in some aspects, process 1400 may include Fig.14 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1400. Additionally or alternatively, two or more blocks of the process 1400 may be executed in parallel.

[0175] 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 by practice of the various aspects.

[0176] 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 with hardware, firmware, and / or a combination of hardware and software.

[0177] As used herein, satisfying a threshold may refer to a value being 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.

[0178] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes-it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0179] Although specific feature combinations are described 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 can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase quoting "at least one of" a column of items refers to any combination of these 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, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0180] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" 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 "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: transmitting a request to a base station (BS) to synchronize access link DRX operation and side link DRX operation of the UE; receiving, from the BS, an indication of an access link discontinuous reception (DRX) configuration and a sidelink DRX configuration based at least in part on transmitting the request, wherein the access link DRX configuration and the side link DRX configuration synchronize the access link DRX operation and the side link DRX operation of the UE; as well as At least one of the following: performing access link communications with the BS based at least in part on the access link DRX configuration, or Sidelink communication is performed with another UE based at least in part on the sidelink DRX configuration.

2. The method of claim 1, wherein: Performing access link communications with the BS based at least in part on the access link DRX configuration includes: Remaining in the access link DRX on mode based at least in part on determining that the UE is in the sidelink DRX on mode.

3. The method of claim 1, wherein: The sidelink DRX on mode duration identified in the sidelink DRX configuration and the access link DRX on mode duration identified in the access link DRX configuration are the same DRX on mode duration.

4. The method of claim 1, wherein: The start time of the sidelink DRX on mode identified in the sidelink DRX configuration and the start time of the access link DRX on mode identified in the access link DRX configuration are the same DRX on mode start time.

5. The method of claim 1, wherein: The sidelink DRX cycle duration identified in the sidelink DRX configuration and the access link DRX cycle duration identified in the access link DRX configuration are the same DRX cycle duration.

6. The method of claim 1, wherein: Performing sidelink communication with another UE based at least in part on the sidelink DRX configuration includes: Remaining in the sidelink DRX on mode based at least in part on determining that the UE is in the access link DRX on mode.

7. The method of claim 6, wherein: Performing sidelink communication with another UE based at least in part on the sidelink DRX configuration includes: Transitioning from the sidelink DRX sleep mode to the sidelink DRX on mode based at least in part on transitioning from the access link DRX sleep mode to the access link DRX on mode.

8. The method of claim 1, wherein: Performing access link communications with the BS based at least in part on the access link DRX configuration includes: Transitioning from the access link DRX sleep mode to the access link DRX on mode based at least in part on transitioning from the side link DRX sleep mode to the side link DRX on mode.

9. The method of claim 1, wherein: A start time of a sidelink DRX on mode identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE.

10. The method of claim 1, wherein: A sidelink DRX cycle duration identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE.

11. A wireless communication method performed by a base station (BS), comprising: configuring an access link discontinuous reception (DRX) configuration and a sidelink DRX configuration for a user equipment (UE) such that the access link DRX configuration and the sidelink DRX configuration synchronize access link DRX operation and sidelink DRX operation of the UE; as well as An indication of the access link DRX configuration and the sidelink DRX configuration is transmitted to the UE.

12. The method of claim 11, wherein: The sidelink DRX on mode duration identified in the sidelink DRX configuration and the access link DRX on mode duration identified in the access link DRX configuration are the same DRX on mode duration.

13. The method of claim 11, wherein: The start time of the sidelink DRX on mode identified in the sidelink DRX configuration and the start time of the access link DRX on mode identified in the access link DRX configuration are the same DRX on mode start time.

14. The method of claim 11, wherein: The sidelink DRX cycle duration identified in the sidelink DRX configuration and the access link DRX cycle duration identified in the access link DRX configuration are the same DRX cycle duration.

15. The method of claim 11, wherein: A start time of a sidelink DRX on mode identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE.

16. The method of claim 11, wherein: A sidelink DRX cycle duration identified in the sidelink DRX configuration is based at least in part on a travel speed of the UE.

17. The method of claim 11, further comprising: receiving, from the UE, a request for radio resources for transmitting sidelink communications on a sidelink to another UE; determining that the other UE is in a sidelink DRX sleep mode; as well as At least in part based on determining that the other UE is in the sidelink DRX sleep mode, transmitting to the UE an indication of timing for retransmitting the request for radio resources to the BS or an indication of a sidelink grant for a time period when the other UE is no longer in the sidelink DRX sleep mode.

18. The method of claim 17, wherein: The request for radio resources includes a buffer status report associated with the UE.

19. The method of claim 17, wherein: An indication of the timing is included in a medium access control control element communication.

20. The method of claim 17, wherein: An indication of the sidelink grant is included in a downlink control information communication.

21. The method of claim 17, further comprising: A sidelink DRX end command is transmitted to the other UE to cause the other UE to terminate sidelink DRX operation of the other UE based at least in part on determining that the other UE is in the sidelink DRX sleep mode.

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