WO2022197492A1 - Configuration drx de liaison latérale pour monodiffusion - Google Patents

Configuration drx de liaison latérale pour monodiffusion Download PDF

Info

Publication number
WO2022197492A1
WO2022197492A1 PCT/US2022/019387 US2022019387W WO2022197492A1 WO 2022197492 A1 WO2022197492 A1 WO 2022197492A1 US 2022019387 W US2022019387 W US 2022019387W WO 2022197492 A1 WO2022197492 A1 WO 2022197492A1
Authority
WO
WIPO (PCT)
Prior art keywords
sidelink
drx
configuration
reception
timing information
Prior art date
Application number
PCT/US2022/019387
Other languages
English (en)
Inventor
Hong Cheng
Junyi Li
Qing Li
Dan Vassilovski
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US17/653,852 external-priority patent/US20220304103A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to CN202280020666.6A priority Critical patent/CN116982353A/zh
Priority to EP22713156.2A priority patent/EP4309425A1/fr
Publication of WO2022197492A1 publication Critical patent/WO2022197492A1/fr

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0212Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to sidelink communication.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. 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, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT)), and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable low latency communications
  • Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • Some aspects of wireless communication may comprise direct communication between devices based on sidelink. There exists a need for further improvements in sidelink technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication at a first user equipment (UE). For example, the apparatus transmits, to a second UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE. The apparatus transmits, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE. The apparatus receives a response from the second UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication including receiving DRX information from a first UE at a second UE.
  • the apparatus receives, from the first UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the first UE and receives, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE.
  • the apparatus transmits a response to the first UE confirming or rejecting the DRX configuration.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • FIG. 2 illustrates example aspects of a sidelink slot structure.
  • FIG. 3 is a diagram illustrating an example of a first device and a second device involved in wireless communication based, e.g., on sidelink.
  • FIG. 4 illustrates example aspects of sidelink communication between devices, in accordance with aspects presented herein.
  • FIGs. 5 A and 5B illustrate example timelines for sidelink DRX operation.
  • FIG. 6 illustrates example aspects of a communication flow including the exchange of RRC configuration information for sidelink communication between two UEs.
  • FIG. 7 illustrates an example communication flow including the negotiation of sidelink DRX configuration information between two UEs as a part of establishing an RRC connection.
  • FIG. 8 illustrates an example communication flow including the negotiation of sidelink DRX configuration information between two UEs after establishing an RRC connection.
  • FIG. 9 is a flowchart of a method of wireless communication including the negotiation of sidelink DRX configuration information between two UEs.
  • FIG. 10 is a flowchart of a method of wireless communication including the negotiation of sidelink DRX configuration information between two UEs.
  • FIG. 11 is a flowchart of a method of wireless communication including the negotiation of sidelink DRX configuration information between two UEs.
  • FIG. 12 is a flowchart of a method of wireless communication including the negotiation of sidelink DRX configuration information between two UEs.
  • FIG. 13 is a diagram illustrating an example of a hardware implementation for an example apparatus. DETAILED DESCRIPTION
  • Some UEs may perform sidelink communication.
  • Sidelink communication may include a direct transmission from one UE that is received via a second UE, e.g., without being received and provided to the second UE via a base station.
  • UE may support discontinuous reception (DRX).
  • DRX discontinuous reception
  • the UE may discontinuous ly monitor/receive for sidelink communication and/or may discontinuous ly transmit sidelink communication using an ON/OFF cycle.
  • the ON/OFF cycle may be referred to as a sleep and wake cycle.
  • DRX may conserve batter power at the UE.
  • Aspects presented herein enable UEs to exchange information about directional sidelink DRX configurations for unicast in order to negotiate a DRX configuration based on timing and QoS for each of the UEs.
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise a random-access memory (RAM), a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the types of computer- readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessedby a computer.
  • Implementations may range a spectrum from chip-level or modular components to non- modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of 1he described aspects.
  • devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor ⁇ ), interleaver, adders/summers, etc.).
  • aspects described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • a first UE 104 may include a sidelink DRX configuration component 198 configured to transmit, to a second UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the first UE 104 and to transmit a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE 104.
  • the second UE may be under coverage of the same base station as the first UE or may be under coverage of a different bases station than the first UE, or may be out of coverage of the network.
  • the sidelink DRX configuration component 198 may be further configured to receive a response from the second UE confirming or rejecting the DRX configuration.
  • the first UE 104 may establish the RRC connection, continue the RRC connection, or release the RRC connection based on the response from the second UE, e.g., as described in more detail in connection with FIGs. 7-10.
  • the sidelink DRX configuration component 198 may be further configured to receive, from another UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the other UE and a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the other UE.
  • the sidelink DRX configuration component 198 may be further configured to transmit a response to the other UE confirming or rejecting the DRX configuration.
  • the UE 104 may establish the RRC connection, continue the RRC connection, or release the RRC connection based on the response from the second UE, e.g., as described in more detail in connection with FIGs. 7-10.
  • a link between a UE 104 and a base station 102 or 180 may be established as an access link, e.g., using a Uu interface. Other communication may be exchanged between wireless devices based on sidelink. For example, some UEs 104 may communicate with each other directly using a device-to-device (D2D) communication link 158. In some examples, the D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH).
  • PSBCH physical sidelink broadcast channel
  • PSDCH physical sidelink discovery channel
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.
  • IEEE Institute of Electrical and Electronics Engineers
  • V2V vehicle-to-vehic le
  • V2I vehicle-to-infrastructure
  • RSU Road Side Unit
  • V2N vehicle-to- network
  • V2P vehicle-to-pedestrian
  • V2X vehicle-to-anything
  • Sidelink communication may be based on V2X or other D2D communication, such as Proximity-based Services (ProSe), etc.
  • sidelink communication may also be transmitted and received by other transmitting and receiving devices, such as Road Side Unit (RSU) 107, etc.
  • Sidelink communication may be exchanged using a PC5 interface, such as described in connection with the example in FIG. 2.
  • RSU Road Side Unit
  • Sidelink communication may be exchanged using a PC5 interface, such as described in connection with the example in FIG. 2.
  • the following description, including the example slot structure of FIG 2 may provide examples for sidelink communication in connection with 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.
  • the wireless communications system (also referredto as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and/or another core network 190 (e.g., a 5G Core (5GC)).
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station).
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (e.g., SI interface).
  • the base stations 102 configured for 5G NR may interface with core network 190 through second backhaul links 184.
  • the base station may also be configured to support 4G LTE or other access technology at the same time.
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface).
  • the first backhaul links 132, the second backhaul links 184, and the third backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG).
  • eNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the base stations may also support Non-Public Network (NPN), in the form of either stand-alone Non-Public Network (SNPN) or Public Network Integrated NPN (PNI-NPN). Access to the base stations may be controlled with Closed Access Group (CAG).
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from aUE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple- input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • MIMO multiple- input and multiple-output
  • the communication links may be through one or more carriers.
  • the base stations 102 / UEs 104 may use spectrum up to 7MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Yx MHz (x component carriers) used for transmission in each direction.
  • the carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL).
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).
  • PCell primary cell
  • SCell secondary cell
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • the STAs 152 / AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP 150. The small cell 102', employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • the small cell 102' employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • the electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc.
  • two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz).
  • the frequencies between FR1 and FR2 are often referredto as mid-band frequencies.
  • FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • Abase station 102 may include and/or be referred to as an eNB, gNodeB (gNB), or another type of base station.
  • Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE 104.
  • the gNB 180 may be referred to as a millimeter wave base station.
  • the millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the path loss and short range.
  • the base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming. Similarly, beamforming may be applied for sidelink communication, e.g., between UEs.
  • the base station 180 may transmit abeamformed signal to the UE 104 in one or more transmit directions 182'.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182".
  • the UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 / UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 / UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Internet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS Streaming Service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and aUser Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the SMF 104 provides QoS flow and session management. All user plane PDU session packets, e.g IP, Ethernet, or unstructured packets, are transferred through the UPF 195.
  • the UPF 195 may provide UEIP address allocation as well as other functions.
  • the UPF 195 is connected to the PDU Services 197.
  • the PDU Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switch (PS) Streaming (PSS) Service, and/or other IP or non-IP based services.
  • IMS IP Multimedia Subsystem
  • PS Packet Switch
  • PSS Packet Switch
  • the base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set(BSS), an extended service set (ESS), atransmit reception point (TRP), or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, amultimedia device, a video device, adigital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.).
  • TheUE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network. Connections between these devices may be Wi-Fi, Bluetooth, Sidelink, or other D2D communication technologies.
  • FIG. 2 includes diagrams 200 and 210 illustrating example aspects of slot structures that may be used for sidelink communication (e.g., between UEs 104, RSU 107, etc.).
  • the slot structure may be within a 5G/NR frame structure in some examples. In other examples, the slot structure may be within an LTE frame structure. Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.
  • the example slot structure in FIG. 2 is merely one example, and other sidelink communication may have a different frame structure and/or different channels for sidelink communication.
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms).
  • Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • Diagram 200 illustrates a single resource block of a single slot transmission, e.g., which may correspond to a 0.5 ms transmission time interval (TTI).
  • a physical sidelink control channel may be configured to occupy multiple physical resource blocks (PRBs), e.g., 10, 12, 15, 20, or 25 PRBs.
  • the PSCCH may be limited to a single sub-channel.
  • a PSCCH duration may be configured to be 2 symbols or 3 symbols, for example.
  • a sub-channel may comprise 10, 15, 20, 25, 50, 75, or 100 PRBs, for example.
  • the resources for a sidelink transmission may be selected from a resource pool including one or more subchannels.
  • the resource pool may include between 1- 27 subchannels.
  • a PSCCH size may be established for a resource pool, e.g., as between 10-100 % of one subchannel for a duration of 2 symbols or 3 symbols.
  • the diagram 210 in FIG. 2 illustrates an example in which the PSCCH occupies about 50% of a subchannel, as one example to illustrate the concept of PSCCH occupying a portion of a subchannel.
  • the physical sidelink shared channel (PSSCH) occupies at least one subchannel.
  • the PSCCH may include a first portion of sidelink control information (SCI), and the PSSCH may include a second portion of SCI in some examples.
  • SCI sidelink control information
  • a resource grid may be used to represent the frame structure.
  • Each time slot may include a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.
  • some of the REs may comprise control information in PSCCH and some Res may comprise demodulation RS (DMRS).
  • DMRS demodulation RS
  • At least one symbol may be used for feedback.
  • FIG. 2 illustrates examples with two symbols for a physical sidelink feedback channel (PSFCH) with adjacent gap symbols. A symbol prior to and/or after the feedback may be used for turnaround between reception of data and transmission of the feedback.
  • PSFCH physical sidelink feedback channel
  • the gap enables a device to switch from operating as a transmitting device to prepare to operate as a receiving device, e.g., in the following slot.
  • Data may be transmitted in the remaining REs, as illustrated.
  • the data may comprise the data message described herein.
  • the position of any of the data, DMRS, SCI, feedback, gap symbols, and/or LBT symbols may be different than the example illustrated in FIG. 2.
  • Multiple slots may be aggregated together in some aspects.
  • FIG. 3 is a block diagram of a first wireless communication device 310 in communication with a second wireless communication device 350 based on sidelink.
  • the devices 310 and 350 may communicate based on V2X or other D2D/ProSe communication. The communication may be based on sidelink using a PC5 interface.
  • the devices 310 and the 350 may comprise a UE, an RSU, a base station, etc. Packets may be provided to a controller/processor 375 that implements layer 3 and layer 2 functionality.
  • Various layer functionality may include a radio resource control (RRC) layer, and a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/ demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BP SK), quadrature phase-shift keying (QPSK),M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)).
  • BP SK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the device 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318 TX.
  • Each transmitter 318 TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354 RX receives a signal through its respective antenna 352.
  • Each receiver 354 RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the device 350. If multiple spatial streams are destined for the device 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by device 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by device 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 may provide demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing.
  • the controller/processor 359 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • the controller/processor 359 may provide RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto TBs, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • PDCP layer functionality associated with header
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by device 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354 TX. Each transmitter 354 TX may modulate an RF carrier with a respective spatial stream for transmission.
  • the transmission is processed at the device 310 in a manner similar to that described in connection with the receiver function at the device 350.
  • Each receiver 318 RX receives a signal through its respective antenna 320.
  • Each receiver 318 RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HAR.Q operations.
  • At least one of the TX processor 368, the RX processor 356, and the controller/processor 359 may be configured to perform aspects in connection with the side link DRX configuration component 198 of FIG. 1.
  • At least one of the TX processor 316, the RX processor 370, and the controller/processor 375 may be configured to perform aspects in connection with the sidelink DRX configuration component 198 of FIG. 1.
  • FIG. 4 illustrates an example 400 of sidelink communication between devices.
  • the communication may be based on a slot structure comprising aspects described in connection with FIG. 2.
  • the UE 402 may transmit a sidelink transmission 414, e.g., comprising a control channel (e.g., PSCCH) and/or a corresponding data channel (e.g., PSSCH), that may be received by UEs 404, 406, 408.
  • a control channel may include information (e.g., sidelink control information (SCI)) for decoding the data channel including reservation information, such as information about time and/or frequency resources that are reserved for the data channel transmission.
  • SCI sidelink control information
  • the SCI may indicate a number of TTIs, as well as the RBs that will be occupied by the data transmission.
  • the SCI may also be used by receiving devices to avoid interference by refraining from transmitting on the reserved resources.
  • the UEs 402, 404, 406, 408 may each be capable of sidelink transmission in addition to sidelink reception. Thus, UEs 404, 406, 408 are illustrated as transmitting sidelink transmissions 413, 415, 416, 420.
  • the sidelink transmissions 413, 414, 415, 416, 420 may be unicast, broadcast or multicast to nearby devices.
  • UE404 may transmit communication 413, 415 intended for receipt by other UEs within a range 401 of UE 404, and UE 406 may transmit communication 416.
  • RSU 407 may receive communication from and/or transmit communication 418 to UEs 402, 404, 406, 408.
  • One or more of the UEs 402, 404, 406, 408 or the RSU 407 may comprise asidelink DRX configuration component 198 as described in connection with FIG. 1.
  • Sidelink communication may be based on different types or modes of resource allocation mechanisms.
  • a first resource allocation mode (which may be referred to herein as “Mode 1”), centralized resource allocation may be provided by a network entity.
  • a base station 102 or 180 may determine resources for sidelink communication and may allocate resources to different UEs 104 to use for sidelink transmissions.
  • a UE receives the allocation of sidelink resources from the base station 102 or 180.
  • a second resource allocation mode (which may be referred to herein as “Mode 2”), distributed resource allocation may be provided. In Mode 2, each UE may autonomously determine resources to use for sidelink transmission.
  • each UE may use a sensing technique to monitor for resource reservations by other sidelink UEs and may select resources for sidelink transmissions from unreserved resources.
  • Devices communicating based on sidelink may determine one or more radio resources in the time and frequency domain that are used by other devices in order to select transmission resources that avoid collisions with other devices.
  • the sidelink transmission and/or the resource reservation may be periodic or aperiodic, where a UE may reserve resources for transmission in a current slot and up to two future slots.
  • individual UEs may autonomously select resources for sidelink transmission, e.g., without a central entity such as a base station managing the resources for the device.
  • a first UE may reserve the selected resources in order to inform other UEs about the resources that the first UE intends to use for sidelink transmission(s).
  • the UE may determine (e.g., sense) whether the selected sidelink resource has been reserved by other UE(s) before selecting a sidelink resource for a data transmission.
  • the UE may use the selected sidelink resource for transmitting the data, e.g., in a PSSCH transmission.
  • the UE may continuously monitor for (e.g., sense) and decode SCI from peer UEs and may exclude resources that are used and/or reserved by other UEs from a set of candidate resources for sidelink transmission by the UE.
  • the UE may transmit SCI indicating its own reservation of the resource for a sidelink transmission.
  • the number of resources (e.g., sub-channels per subframe) reserved by the UE may depend on the size of data to be transmitted by the UE.
  • the reservations may also be received from an RSU or other device communicating based on sidelink.
  • a UE may support discontinuous reception (DRX) for sidelink communication.
  • DRX discontinuous reception
  • the UE may discontinuous ly monitor and/or decode for sidelink communication and/or may discontinuous ly transmit sidelink communication using an ON/OFF cycle.
  • the ON/OFF cycle may be referred to as a sleep and wake cycle.
  • DRX may conserve batter power at the UE.
  • the UE may continuously monitor and/or decode for sidelink transmissions from other UEs. The continuous monitoring may drain the UE’ s batter power.
  • the UE may conserve power by periodically refraining from monitoring and/or transmitting during OFF durations according to the DRX cycle. FIGs.
  • 5 A and 5B illustrate examples of a DRX cycle for UE 1 including periodic ON durations during which the UE may transmit/receive sidelink communication and OFF durations during which the UE does not transmit/receive sidelink communication.
  • the UE may enter a sleep mode or a lower power mode in which the UE minimizes power consumption by shutting down a radio frequency (RF) function, for example.
  • RF radio frequency
  • the UE may perform other operations, e.g. tune to a different frequency band, perform other measurements, or transmitting other signals/messages not related to the sidelink communication.
  • the UE may wake up from the OFF duration of the DRX cycle, or tune back to the related frequency bands, in order to transmit/receive sidelink communication.
  • sidelink communication is exchanged between UEs.
  • sidelink DRX operation may affect both a transmitting UE and a receiving UE for even unicast sidelink operation.
  • Sidelink DRX operation may be configured for a sidelink unicast link between the two UEs, e.g., after the sidelink unicast link is established between the two UEs.
  • the sidelink DRX configuration may be configured per a pair of a source and a destination. The source may be a first UE and the destination may be the second UE, for example.
  • the DRX configuration may be configured per direction on the unicast link.
  • the DRX configuration may be separately configured for DRX transmission from the first UE on the sidelink unicast link, DRX reception by the first UE on the sidelink unicast link, DRX transmission from the second UE on the sidelink unicast link, and DRX reception by the second UE on the sidelink unicast link.
  • Aspects presented herein provide for a UE to initiate a sidelink DRX configuration that may be accepted, rejected, and/or adjusted by the other UE.
  • aspects presented herein may be applied for UEs in an OOC setting in which one or more of the UEs are outside of coverage of a base station (e.g., base station 102 or 180 in FIG. 1) and/or in an in-coverage setting in which the UEs are within coverage of a base station.
  • a base station e.g., base station 102 or 180 in FIG. 1
  • FIGs. 5A illustrate that a sidelink DRX configuration may be configured for a first UE, and a different sidelink DRX configuration may be configured for the second UE.
  • the DRX ON durations of the sidelink DRX configurations for the two UEs do not overlap.
  • the time diagram 550 shows an overlap between the sidelink DRX configurations for the two UEs.
  • the DRX configuration information may be exchanged between the UEs in RRC signaling on PC5 interface (i.e. sidelink).
  • a sidelink RRC procedure e.g., a PC5 RRC procedure, may be performed per direction of the sidelink communication.
  • UE1 602 may signal a sidelink RRC configuration information 606, e.g., PC5 RRC configuration information, for a sidelink radio bearer (SLRB) configuration for the direction from UE1 602 to UE2 604.
  • UE2 604 may signal an PC5 RRC configuration information 608, e.g., a PC5 RRC configuration information, for an SLRB configuration for the direction from UE2602 to UE1 604.
  • the UE1 602 may transmit sidelink communication 610 based on the first RRC configuration that the UEl 602 signaled at 606.
  • the UE2 604 may transmit sidelink communication 612 based on the second RRC configuration that the UE2 604 signaled at 608.
  • a sidelink DRX configuration may be configured in PC5 RRC signaling in a directional manner between a pair of UEs.
  • the RRC configuration information 606 may include sidelink DRX configuration information for a DRX cycle of UEl 602, e.g., a directional sidelink DRX configuration for the UEl 602 as a transmitting UE (which may be referred to as transmission-centric or Tx-centric) or as a receiving UE (e.g., which may be referred to as receiving-centric or Rx-centric).
  • the RRC configuration information 608 may include sidelink DRX configuration information for a DRX cycle of UE2 604, e.g., a directional sidelink DRX configuration for the UE2 604 as a transmitting UE (which may be referred to as Tx-centric) or as a receiving UE (e.g., which may be referred to as Rx-centric).
  • the DRX configuration of UE1 602 will affectthe timing at which UE2 604 is to receive communication from UE1 602 and/or the timing at which UE2 604 is to transmit communication to the UE1 602.
  • the DRX configuration of UE2 604 may affect the ability of UE1 to take advantage of a DRX OFF duration.
  • the ON duration forUEl does not overlap with the ON duration for UE2.
  • UE2 may also need to be in an ON duration or not have a conflict with other communication.
  • an overlap between the ON duration of UE1 and the ON duration of UE2 may enable UE1 to be awake to receive sidelink communication from UE2 that the UE2 may transmit during its ON duration.
  • aspects presented herein provide for information to be included in configuration messages between UEs to coordinate sidelink DRX configurations for the UEs.
  • aspects presented herein enable the UEs to negotiate a sidelink DRX configuration in order to establish a sidelink DRX configuration that satisfies Quality of Service (QoS) and/or power saving preferences for both UEs.
  • QoS Quality of Service
  • FIGs. 7 and 8 illustrate example aspects of communication flows 700 and 800 between two UEs to configure a directional sidelink DRX configuration for a unicast link between two UEs.
  • FIG. 7 illustrates an example in which the sidelink DRX configuration may be performed during establishment of a sidelink connection between the two UEs, e.g., during a PC5 connection establishment.
  • UE1 702 and UE2 704 may exchange information to establish a PC5 RRC connection.
  • the connection may be for a sidelink unicast link between the UE1 702 and the UE2 704.
  • the UEs may exchange various types of information on PC5 including the exchange of UE’s capability information, exchange of configuration information, exchange of security information, exchange of information about radio bearers based on QoS, etc. As well, the UEs may perform a discovery procedure, at 701, prior to beginning to establish the PC5 RRC connection at 706.
  • UE1 702 may be referred as an initiating UE that initiates a directional sidelink DRX configuration for UEl.
  • UE2 704 may be referred to as a responding UE that may confirm or reject the directional sidelink DRX configuration for the UE1 702.
  • the UEs may determine a sidelink DRX configuration for transmission by UE1 702 (e.g., which may be referred to as a “7 - Config ”) and/or a sidelink DRX configuration for reception by UE1 702 (e.g., which may be referred to as a “Rx-Config”).
  • a sidelink DRX configuration for transmission by UE1 702 e.g., which may be referred to as a “7 - Config”
  • Rx-Config a sidelink DRX configuration for reception by UE1 702
  • a UE may determine its sidelink DRX configuration(s) based on its capability, QoS requirements for the unicast (e.g., latency or packet delay budget, data rate, data packet size, reliability, etc.), configured sidelink DRX parameters or configuration, established sidelink DRX configurations for one or more PC5 connections in the proximity of the UE, and/or other UE’s information received (e.g., other UE’s capability message or other UE’s assistance information message, which may contain capability, QoS requirements and/or configured or established sidelink DRX configurations).
  • the sidelink DRX parameters and/or the sidelink DRX configuration may be preconfigured or configured prior to the UEs establishing a sidelink connection.
  • the UEl 702 may determine parameters for a directional sidelink DRX configuration for the UE1.
  • the sidelink DRX configuration parameters may include a starting point (TO) and ending point (Tl) of a DRX ON duration or an ON timer with associated offset configuration for a DRX ON duration for DRX transmission from the UE1.
  • the DRX configuration for transmission from the UE1 702 may be indicated as Tx-Config ([TO, Tl] a time interval with the system’s time reference or a time interval within a DRX cycle).
  • the sidelink DRX configuration parameters may include a starting point (T2) and ending point (T3) of a DRX ON duration or an ON timer with associated offset configuration for a DRX ON duration for DRX reception from the UE1.
  • the DRX configuration for reception by the UE1 702 may be indicated as Rx-Config ([T2, T3] a time interval with the system’s time reference or a time interval within a DRX cycle).
  • FIGs. 5A and 5B illustrate examples of TO, Tl for a DRX ON duration for transmission by the UE. As illustrated in FIG. 5A, the DRX ON duration may additionally, or alternatively, correspond to T2, T3 for reception by the UE.
  • the UE2 704 may determine parameters for a directional sidelink DRX configuration for the UE2.
  • the sidelink DRX configuration parameters may include a starting point (T6) and ending point (T7) of a DRX ON duration or an ON timer configuration for a DRX ON duration for DRX transmission from the UE2.
  • T6 starting point
  • T7 ending point
  • the starting point may be implicit, or included explicitly as part of the DRX configuration.
  • the DRX configuration for transmission from the UE2 704 may be indicated as Tx-Config ([T6, T7] a time interval with the system’ s time reference or a time interval within a DRX cycle
  • the sidelink DRX configuration parameters may include a starting point (T4) and ending point (T5) of a DRX ON duration or an ON timer configuration for a DRX ON duration for DRX reception by the UE2.
  • the DRX configuration for reception by the UE2 704 may be indicated as Rx-Config ([T4, T5] a time interval with the system’s time reference or a time interval within a DRX cycle/ FIGs. 5 A and 5B illustrate examples of T4, T5 for a DRX ON duration of UE2.
  • the initiating UE may send an RRC reconfiguration message (which may be referred to as an ⁇ RRCReconfigit ration Side/ ink message”) with the sidelink DRX configuration information Tx-Config ([TO, Tl]) for UEl’s DRX transmission and Rx-Config ([T2, 13 /) for UEl ’s DRX reception.
  • the UE1 702 may indicate in the message whether or not the Tx-Config and/or Rx-Config is flexible/negotiable with the UE2.
  • the UE1 702 may indicate, in the message, the corresponding DRX-cycle -period -Tx(T) and DRX-cycle -period -Rx(T)’ (e.g., DRX cycle 520 as shown in FIG. 5A) based on QoS flow or requirements, e.g., latency or packet delay budget.
  • the responding UE e.g., UE2
  • the responding UE may be able to determine the DRX configuration of UE1 based on [TO, Tl] and/or, or [T2, T3] and the common DRX cycle.
  • the time duration that starts with TO and extends to Tl may overlap with the time duration that starts with T2 and ends with T3.
  • the times DRX ON duration for transmission may overlap with the DRX ON duration for reception.
  • the DRX ON durations may not overlap, e.g., in order to provide for half-duplex communication atthe UEl.
  • the UE1 702 may indicate, in the message, 712 an offset (e.g., DRX ON offset 510 as shown in FIG. 5A) for starting the sidelink transmission from the UE1 and/or a second offset (e.g., DRX ON offset) for starting the sidelink reception by the UE1.
  • an offset e.g., DRX ON offset 510 as shown in FIG. 5A
  • a second offset e.g., DRX ON offset
  • UE2704 may be referred to as the responding UE. As illustrated at 714, the UE2704 may check its own Rx-Config ([T4, T5]) to see whether it covers [TO, T1J , e.g., overlaps at least partially with [TO, T1 ]. If ([T4, T5]) does not overlap in time with [TO, T17, such as illustrated in the example in FIG. 5A, the UE 2 may further consider whether it can it adjust its Rx-Config ([T4, T5 ]) to allow it to cover [TO, T1 ], e.g, provide an overlap with UEl’s Tx-Config ([TO, Tl]).
  • the UE2 may check its own Tx-Config ([T6, T7)], to see whether it falls within [T2, T3J. If not, the UE2 may determine whether its Tx-Config ([T6, T7]) is adjustable to allow it to be within [T2, T3]
  • the UE2 704 may have other connections with other UEs and/or with a network, which may affect the ability ofUE2 to adjust its DRX timing parameters.
  • UE2 704 may further consider whether it can it adjust its DRX cycle (e.g., DRX cycle 522 as shown in FIG. 5A) for reception and/or transmission for the DRX alignment between UE1 and UE2.
  • DRX cycle e.g., DRX cycle 522 as shown in FIG. 5A
  • UE2 704 may further consider whether it can it adjust its DRX Offset (e.g., Offset 512 as shown in FIG 5A) for reception and/or transmission for the ON duration alignment between UE1 and UE2.
  • DRX Offset e.g., Offset 512 as shown in FIG 5A
  • the UE2 may respond with a message confirming the sidelink DRX configuration for UE1, e.g., in a sidelink RRC reconfiguration complete message 716.
  • the UE2 704 may transmit the RRCReconfigurationCompleteSidelink message with adjusted configuration information for the reception/transmission DRX configuration for UE1 702.
  • the UE2 may transmit the message 716 if the answer to questions 1 and 2 in 714 are yes, for example.
  • the UE2 may indicate an adjusted Rx-Config ([TO Tl ']) and/or adjusted Tx-Config ([T2 T3 ] to UE1. As illustrated in FIG.
  • the time duration for the Rx-Config ([T4, T5 ]) for UE2 may overlap in time with the Tx-Config ([TO, Tl]) of UE1.
  • the UE2 704 may indicate an adjusted DRX timing for the UE, e.g., based on TO and/or Tl.
  • [TO', Tl] may be the same as [TO, Tl ], or within the range of [TO, Tl ].
  • TO ’ is the adjusted starting point that is the same or larger than TO and Tl ’ is the adjusted ending point that is the same or smaller than Tl.
  • FIG. 5B illustrates an example in which T3’ is the same as T3, for example.
  • the UE1 702 and the UE2 704 may continue to establish the sidelink RRC connection including the side link DRX configuration based on Tx-Config ([TO', Tl ']) and/or Rx-Config ([ ⁇ T3 ] for UE1 and Rx-Config ([TO', Tl ']) and/or Tx-Config ([T2 T3 ] for UE2.
  • the UE1 may wake up to transmit or receive according to the corresponding DRX ON duration of the DRX configuration and may enter a lower power mode or a sleep mode in which it does not, or limits, transmit/receive during a corresponding OFF duration. Additionally, or alternatively, the adjusted Tx-Config ([TO' , Tl]) and/or Rx-Config ([T2 T3 ]) may be based on adjusting the ON timer for transmission on duration and the associated on duration offset and adjusting the ON timer for reception on duration and the associated on duration offset respectively.
  • the adjusted Tx-Config ([TO' , Tl']) and/or Rx-Config ([T2 T3 ]) may also be based on adjusting the DRX cycle length for transmission and DRX cycle length for reception respectively.
  • the UE2704 may transmit a failure message rejecting the indicated DRX configuration for UE1, e.g., an RRC reconfiguration failure message (which may be referred to as an “ RRCReconfigurationFailureSidelink message”) ⁇
  • the UE2 may indicate a different DRX configuration with different DRX timing parameters for the UE1.
  • the UE2 may respond with its sidelink DRX configuration parameters (e.g.
  • the UE2 may indicate the different timing parameters if the UE1 indicated in the message 712 that the parameters were flexible or negotiable.
  • the UE1 702 may determine whether it can adjust its DRX configuration based on the parameters Rx-Config ([T4, T5 ]) and Tx-Config ([T6, T7]) that were received from UE2 704.
  • the UE1 702 may determine whether it can adjust its Rx on duration [T2, T3 ] based on UE2’ s Tx on duration [T6, T7] and/or whether it can adjust its Tx on duration [TO, Tl ] based on UE2’s Rx on duration [T3, T4] If the UE1 702 determines that it can adjust its Tx-Config ox Rx- Config, the UEs may continue to establish the RRC connection with the DRX configuration Tx-Config[T3, T4] and/or Rx-Config [T6, T7] The UE1 may transmit an RRC message to the UE2 indicated confirmation or acceptance of the indicated DRX configuration parameters for UE1.
  • the UE1 may respond to the message 718 by transmitting the RRC reconfiguration message 720 indicating an adjusted timing for [T4 T5 ’J and/or [T6 T77 that falls within or are the same as the timing parameters Rx-Config ([T4, T5]) and Tx-Config ([T6, T7]) received from the UE2. For example, the UE1 may transmit 720 with an indication of one or more of Tx-Config ([T4 T5 ]) and Rx- Config (fT6 ’, T7 ’J).
  • the adjusted Tx-Config ([T4 T5']) and/or Rx-Config ([T6 T7 ’]) may be based on adjusting the ON timer for transmission on duration and the associated on duration offset and adjusting the ON timer for reception on duration and the associated on duration offset respectively. Additionally, or alternatively, the adjusted Tx-Config ([TO' , Tl]) and/or Rx-Config ([T2 T3 ’]) may also be based on adjusting the DRX cycle length for transmission and DRX cycle length for reception respectively.
  • the UE1 and the UE2 may continue to respond with RRC messages either proposing new times and/or proposing adjusted times for the DRX configuration for UE1.
  • the UEs may proceed through multiple iterations of the described messaging exchange before confirming a directional sidelink DRX configuration for the UE1 702.
  • the PC5 connection may be established with a default or fallback common sidelink DRX (pre-)configured or without sidelink DRX, or the PC5 connection establishment may be stopped, as illustrated at 722.
  • step 722 may be performed based on whether or not the Tx-Config and/or the Rx-( 'onfig are flexible. If the time parameters are not flexible (i.e. not negotiable), the UE1 and UE2 may proceed to 722 upon receiving a failure/rejection message, such as at 718.
  • FIG. 8 illustrates an example communication flow 800 in which the sidelink DRX configuration is performed, or updated, during or after the establishment of the sidelink connection, e.g. PC5 connection, at 806.
  • the RRC establishment may include any of the aspects described in connection with 706 in FIG. 7.
  • the RRC establishment, at 806, may include a configuration (or agreement on a configuration) for sidelink DRX for the UE1, e.g., based on any of the aspects described in connection with FIG. 7.
  • the RRC connection may be established with a default or fallback common sidelink DRX (pre-)configured or without sidelink DRX.
  • the UE1 and the UE2 may each determine parameters for a directional sidelink DRX configuration, as described in connection with 708 and 710 in FIG. 7.
  • the initiating UE may receive an assistance information message 812 from another UE (e.g., UE2 804) to initiate the sidelink DRX configuration/configuration update for the UE1 802.
  • the assistance information message may be referred to as a “ RRC-UE-Assistance-Info-Sidelink message” and may include Tx-Config ([TO, Tl]) or an ON timer and associated offset for UE1 transmission on duration and/or Rx-Config ([T2, T3J) or an ON timer and associated offset for UE1 reception on duration, based on UE2’s capability, power saving requirements, QoS requirements, (pre-)configuration sidelink DRX, and/or sidelink DRX for PC5 connections with other UEs in proximity, as described in connection with the parameter information in 712 in FIG.
  • the message 812 may indicate a corresponding DRX cycle period, e.g., DRX-cycle-period -Tx(T) and/or DRX-cycle-period -Rx(T)’ , as described in connection with FIG. 7.
  • the assistance information may be contained within the UE2’s sidelink UE capability message during establishing PC5 connection, and it may include power saving requirements, QoS requirements, (pre-)configured sidelink DRX.
  • the initiating UE, UE1 802 may check, at 814, its own Rx-Config ([T4, T5]), with [TO, Tl ] or its Tx-Config ([T6, T7)] with [T2, T3 ], to determine whether the UEl can adjust its Rx-Config ([T4, T5 J) based on [TO, Tl ] or its Tx-Config ([T6, T7) ] based on [T2, T3 ].
  • the determination may include similar determinations to those described in connection with 714 in FIG. 7.
  • the UEl 802 may send anRRC configuration message, e.g., 816, indicating the DRX timing/adjusted DRX timing for communication with the UE2. For example, the UEl 802 may send an “RRCReconfigurationSidelink message” to the UE2 804.
  • the message 816 may include associated DRX-cycle period information and/or offset information, e.g., as described in connection with the message 712 in FIG. 7.
  • the UE2 804 may respond to the message 816 by transmitting an RRC configuration complete message 820 indicating a confirmation or acceptance of the sidelink DRX parameters indicated by the UE1, e.g., if the UE2 can adjust its Tx-Config or Rx- Config accordingly.
  • the message may be referred to as an
  • the UE2 804 may respond to the message 816 by transmitting an RRC failure message 822 indicating that the UE2 rejects the sidelink DRX parameters indicated by the UE1 802 in the message 818, e.g., if the UE2 804 cannot adjust its Tx-Config or Rx-Config according to the timing parameters indicated by the UE1 802.
  • the message 822 may be referred to as an “ RRCReconfigurationFailureSidelink message.”
  • the UE1 802 may transmit an RRC configuration message 818 (e.g., which may be referred to as an ⁇ RRC Reconfigu ration Side link message”) with different DRX timing parameters than those indicated by the UE2 804.
  • the inclusion of the different timing parameters may indicate that the UE assistance information, e.g., 812, cannot be used by the UE1 802, e.g., if the UE1 cannot adjust its Rx-Config ([T4, T5]) to overlap with [TO, T1J or its Tx-Config ([T6, T7)] to overlap with [T2, T3J.
  • the UE1 may send different DRX timing parameters Rx-Config ([T4, T5]) and Tx-Config ([T6, T7f) to the UE2 804.
  • the UE2 804 may respond to the message 818 by transmitting an RRC configuration complete message 820 indicating a confirmation or acceptance of the sidelink DRX parameters indicated by the UE1, e.g., if the UE2 can adjust its Tx-Config or Rx- Config accordingly.
  • the message may be referred to as an
  • the UE2 804 may respond to the message 818 by transmitting an RRC failure message 822 indicating that the UE2 rejects the sidelink DRX parameters indicated by the UE1 802 in the message 816, e.g., if the UE2 804 cannot adjust its Tx-Config ([T4 T5]) ox Rx-Config ([T6 T7]) according to the timing parameters indicated by the UE1 802.
  • the message 822 may be referred to as an “ RRCReconfigurationFailureSidelink message.”
  • the sidelink DRX configuration is rejected, the PC5 connection may be continued with a default or fall back sidelink DRX or without sidelink DRX, or the PC5 connection may be released, e.g., as illustrated at 824.
  • a configuration carried on either RRC Configuration message (e.g., which may be referred to as an “ RRCReconfigurationSidelink message”) or UE Assistance Information message (e.g., which may be referredto as an “RRC-UE-Assistance-Info- Sidelink message”) may further contain configurations for an Inactivity timer, HARQ RTT timer and HARQ retransmission timer if HARQ is enabled, and the UEs may negotiate one or multiple suitable values for each based on UE capability, QoS requirement, power saving requirement, etc.
  • a configuration (e.g., Tx-Config or Rx-Config) carried on either RRC Configuration message (e.g., which may be referred to as an “ RRCReconfigurationSidelink message”) or UE Assistance Information message (e.g., which may be referredto as an “RRC-UE-Assistance-Info-Sidelink message”) is a sidelink DRX configuration or a UE’s assistance information for sidelink DRX configuration may be explicitly indicated in the RRC Configuration message or UE Assistance Information message, e.g., a flag bit; may be implicitly indicated based on the directional sidelink DRX configuration.
  • RRCConfigurationSidelink message e.g., which may be referred to as an “ RRCReconfigurationSidelink message”
  • UE Assistance Information message e.g., which may be referredto as an “RRC-UE-Assistance-Info-Sidelink message”
  • assistance information for sidelink DRX configuration may be explicitly
  • Tx-Config is a sidelink DRX configuration for transmission (e.g., Tx-centric)
  • the Rx-Config may be a UE’s assistance information for the other UE’s sidelink DRX configuration for transmission
  • Rx-Config is a sidelink DRX configuration for reception (e.g., Rx- centric)
  • the Tx-Config may be a UE’s assistance information for the other UE’s sidelink DRX configuration for reception.
  • this configuration may be a sidelink DRX configuration; if only one configuration (e.g., Tx-Config or Rx-Config) is indicated in a UE Assistance Information message, this configuration may be a UE’s assistance information for sidelink DRX configuration.
  • a UE may be configured as the UE determining a sidelink DRX configuration, i.e. a primary role, and a UE may default to the UE determining a sidelink DRX configuration, e.g., the UE initiating radio bearer(s) or initiating an RRC configuration, i.e. a primary role.
  • a UE determines a sidelink DRX configuration, it may set up a sidelink DRX configuration via RRC configuration message (e.g., which may be referred to as an “ RRCReconfigurationSidelink message”) and indicate if negotiating is allowed or not. If negotiation is not allowed, the other UE may accept the sidelink DRX accordingly.
  • RRC configuration message e.g., which may be referred to as an “ RRCReconfigurationSidelink message
  • the UE determining a sidelink DRX configuration may decide if a sidelink DRX configuration must be taken or not during the negotiation process, and the other UE may accept the sidelink DRX accordingly. For example, if each UE determines its sidelink DRX for transmission, UE1 may indicate its Tx-config to UE2 and UE2 may set its Rx-config accordingly; similarly, UE2 may indicate its Tx-config to UE1 and UE1 may set its Rx-config accordingly.
  • UE1 may indicate its Rx-config to UE2 and UE2 may set its Tx-config accordingly; similarly, UE2 may indicate its Rx-config to UE1 and UE1 may set its Tx-config accordingly.
  • the configuration may be performed with a single round of PC5-RRC signaling.
  • the UEl may send similar UE assistance information together with the RRCReconfigurationSidelink message 816.
  • the UE2 804 may then respond with the message 820 or 822.
  • the information in message 812 and 816 may be transmitted together in a single message from an initiating UE, e.g., from UE1, rather than the UE2 804 transmitting the UE assistance information, e.g., 812, and the UE1 802 responding with the
  • RRCReconfigurationSidelink message e.g., 816.
  • a UE may be under a base station’s management, e.g., UE 104 under management of a base station 102 or 180 as shown in FIG. 1.
  • the base station may determine sidelink DRX either for transmission (e.g., Tx-centric) or for reception (e.g., Rx-centric) with or without the UE’s assistance information.
  • a UE may send a UE assistance information to a base station, the UE assistance information may include UE’s capability, UE’s QoS and power saving requirements, and/or UE’s suitable sidelink DRX configuration.
  • a UE may send a UE assistance information to a base station, where the UE assistance information may be received from the other UE paired for a unicast on PC5 and the UE assistance information may include the other UE’s capability, the other UE’s QoS and power saving requirements, the other UE’s suitable sidelink DRX configuration and/or other UE’s sidelink DRX configuration sent from another base station with which the other UE is connected.
  • a UE may be under a base station’s management, e.g., UE 104 under management of a base station 102 or 180 as shown in FIG. 1.
  • the base station may configure sidelink DRX either for transmission (e.g., Tx-centric) or for reception (e.g., Rx-centric) based on the determined sidelink DRX configuration.
  • both UEs communicating on the PC5 link under the same base station’s management may receive sidelink configuration for transmission and/or reception (e.g., Tx-configl and Rx- configl received by UEl and Rx-config2 and Tx-config2 received by UE2) from the base station (e.g., which may be referred to as an “ RRCRe configuration message ” cn Uu interface) and the base station may cooperate the alignment between UEs’ sidelink DRX configuration, e.g., R x-config2 corresponding to Tx-configl and T x-config2 corresponding to Rx-config 1.
  • only one of the UEs communicating on PC5 link under the base station’s management may receive a sidelink configuration for transmission and/or reception (e.g., Tx-configl and Rx- config I received by UEl), and the UE may send its sidelink DRX configuration to the other UE which may be out of base station’s coverage.
  • the other UE may acceptor reject the configuration. If rejected, the UE that initially received the configuration (e.g., UEl) may report the rejection to the base station.
  • the base station may adjust the configuration accordingly and resend the sidelink configuration to the UE (e.g., UEl).
  • one of the UEs communicating on the PC5 link may be under one base station’s management, and the other of the UEs communicating on the PC5 link may be under another base station’s management.
  • both UEs may receive sidelink configurations for transmission and/or reception (e.g., Tx-configl and Rx- config J received by UEl and Rx-config2 and Tx-config2 received by UE2) and the sidelink configurations may not align with each other.
  • the UEs may negotiate the final sidelink DRX configuration on PC5 link as shown in FIGs. 7 and 8, or one UE may decide the final sidelink DRX configuration as described previously for a UE determining a sidelink DRX configuration.
  • FIG. 9 is a flowchart 900 of a method of wireless communication.
  • the method may be performed by a UE (e.g., the UE 104, 402, 602, 702, 804; the device 310, 350; the apparatus 1302).
  • the method may enable the UE to initiate a directional sidelink DRX configuration for the UE.
  • the UE transmits, to a second UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the first UE.
  • the UE transmits, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE.
  • the transmission at 904 and 906 may be comprised in a single message, e.g., the message 712 or 816 described in connection with FIG. 7 or FIG. 8.
  • the transmission configuration with the first timing information and the reception configuration with the second timing information may be transmitted in an RRC message for sidelink RRC reconfiguration, which may be referred to as an RRCReconfigurationSidelink message.
  • the transmissions may be performed, e.g. by the sidelink DRX configuration component 1340 via the transmission component 1334 and/or the RF transceiver 1322 in the apparatus 1302 in FIG. 13.
  • the first timing information may include a first starting point and a first ending point for a DRX ON duration within a transmission DRX cycle and the second timing information includes a second starting point and a second ending point for the DRX on duration within a reception DRX cycle.
  • the starting point and ending point may be based on any of the aspects described in connection with FIGs. 5A, 5B, 7, and/or 8.
  • a message 712 may include Tx-Config ([TO, T1J) and/or Rx-Config ([T2,T3]).
  • a message 816 may include Tx-Config ([T4, T5]) and/or Rx-Config ([T6,T7J).
  • the transmission configuration may further include a transmission DRX cycle period for the sidelink transmission from the first UE and the reception configuration further includes a reception DRX cycle period for the sidelink reception by the first UE.
  • the message may further indicate DRX-cycle-period-Tx(T) and RX-cycle- period-Rx(T), e.g., as described in connection with 712 and/or 816 in FIGs. 7 and/or 8
  • the transmission configuration may further include a first offset (e.g., DRX ON offset) for starting the sidelink transmission from the first UE and the reception configuration further includes a second offset (e.g., DRX ON offset) for starting the sidelink reception by the first UE, e.g., as described in connection with 712 and/or 816 in FIGs. 7 and/or 8.
  • a first offset e.g., DRX ON offset
  • a second offset e.g., DRX ON offset
  • the UE receives a response from the second UE confirming or rejecting the DRX configuration.
  • the response may be received in an RRC message, e.g., indicating that the RRC reconfiguration is complete or is a failure.
  • the reception may be performed, e.g. by the sidelink DRX configuration response component 1342 via the reception component 1330 and/or the RF transceiver 1322 in the apparatus 1302 in FIG. 13.
  • FIG. 10 is a flowchart 1000 of a method of wireless communication.
  • the method may be performed by aUE (e.g., the UE 104, 402, 602, 702, 804; the device 310, 350; the apparatus 1302) and may include the transmission of the transmission configuration, transmission of the reception configuration, and reception of a response confirming or rejecting the DRX configuration, e.g., as described in connection with 904, 906, and 908 in FIG. 9.
  • aUE e.g., the UE 104, 402, 602, 702, 804; the device 310, 350; the apparatus 1302
  • a response confirming or rejecting the DRX configuration
  • the UE may receive, prior to transmitting the transmission configuration or the reception configuration at 904 and 906, a message from the second UE including at least one of third timing information for the DRX configuration for the sidelink reception from the second UE and fourth timing information for the DRX configuration for the sidelink transmission by the second UE.
  • the reception may be performed, e.g. by the assistance information component 1344 via the reception component 1330 and/or the RF transceiver 1322 in the apparatus 1302 in FIG. 13.
  • the message from the second UE may comprise an RRC radio message including UE assistance information for sidelink, e.g., an “RRC-UE- As si stance -Info-Side link” message.
  • FIG. 8 illustrates a UE (e.g., UE2 804) receiving the message 812 with the assistance information prior to transmitting the RRC reconfiguration message, e.g., 816, for example.
  • the response may comprise a confirmation of the DRX configuration, such as the RRCReconfigurationCompleteSidelink message, e.g., 716 in FIG. 7 or 820 in FIG. 8.
  • the UE may establish a sidelink connection with the second UE based on the DRX configuration in response to receiving the confirmation, e.g., as described in connection with FIG. 7.
  • the UE may continue a sidelink connection with the second UE based on the DRX configuration in response to receiving the confirmation, e.g., as described in connection with FIG. 8.
  • the response may comprise a confirmation of the DRX configuration, such as the RRCReconfigurationCompleteSidelink message, e.g., 716 in FIG. 7 or 820 in FIG. 8.
  • the UE may receive, in the response, at least one of an adjusted transmission duration based on the first timing information or an adjusted reception duration based on the second timing information.
  • the UE may receive an RRCReconfigurationCompleteSidelink message with [TO’, TE] and/or [T2’,T3’], e.g., as described in connection with 716 in FIG. 7 or with 820 in FIG. 8.
  • the UE may establish a sidelink connection with the second UE based on the adjusted transmission duration and the adjusted reception duration received from the second UE in response to receiving the confirmation, e.g., as described in connection with FIG. 7.
  • the UE may continue a sidelink connection with the second UE based on the adjusted transmission duration and the adjusted reception duration received from the second UE in response to receiving the confirmation, e.g., as described in connection with FIG. 8.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the response may comprise a rejection of the DRX configuration.
  • the UE may receive, in the response, at least one of fifth timing information (e.g., [T6, T7]) for the DRX configuration for the sidelink transmission from the second UE and sixth timing information (e.g., [T4, T5]) for the DRX configuration for the sidelink reception by the second UE.
  • FIG. 7 illustrates an example of a message 718 that indicates different timing information.
  • FIG. 8 illustrates an example of a message 820 that indicates different timing information.
  • the UE may establish or continue a sidelink connection with the second UE with DRX based on at least one of the third timing information or the fourth timing information received from the second UE, e.g., if the UE can use the timing information received at 1016.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the UE may establish or continue a sidelink connection with the second UE without DRX based on the first UE not supporting the third timing information or the fourth timing information indicated by the second UE.
  • FIG. 7 illustrates an example of the UEl continuing the connection without DRX, at 722.
  • FIG. 8 illustrates an example of the UE2 continuing the connection without DRX, at 824.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the UE may stop establishment of the sidelink connection with the second UE or release the sidelink connection with the second UE in response to the rejection of the DRX configuration based on the first UE not supporting the third timing information or the fourth timing information indicated by the second UE.
  • FIG. 7 illustrates an example of the UE1 stopping establishment of the connection without DRX, at 722.
  • FIG. 8 illustrates an example of the UE2 releasing the connection without DRX, at 824.
  • the establishment of the sidelink RRC connection may be stopped or the connection may be released by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the UE may transmit, to the second UE, different timing information for the sidelink transmission or the sidelink reception of the first UE in response to the rejection.
  • the UE1 may transmit adjusted timing information [T4’, T5’] and/or [T6’, T7’].
  • the UE may send a different time to begin another iteration of the DRX negotiation with the second UE.
  • the transmission may be performed, e.g., by the sidelink DRX configuration component 1340 via the transmission component 1334 and/or the RF transceiver 1322 of the apparatus 1302 in FIG. 13.
  • the response may comprise a rejection of the DRX configuration, at 1014 without the timing information, at 1016.
  • the UE may establish or continue a sidelink connection, at 1024, with the second UE without DRX in response to the rejection of the DRX configuration.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the response may comprise a rejection of the DRX configuration, at 1014 without the timing information, at 1016, and the UE may stop establishment of a sidelink connection with the second UE or release the sidelink connection with the second UE, at 1026, in response to the rejection of the DRX configuration.
  • the establishment of the sidelink RRC connection may be stopped or the connection may be released by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • FIG. 11 is a flowchart 1100 of a method of wireless communication.
  • the method may be performed by a UE (e.g., the UE 104, 402, 604, 704, 802; the device 310, 350; the apparatus 1302).
  • the method may enable the UE to negotiate directional sidelink DRX configuration.
  • the UE receives, from the first UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the first UE.
  • the UE receives, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE.
  • the reception at 1104 and 1106 may include reception of a single message, e.g., the message 712 or 816 described in connection with FIG. 7 or FIG. 8.
  • the transmission configuration with the first timing information and the reception configuration with the second timing information may be received in an RRC message for sidelink RRC reconfiguration, which may be referred to as an RRCReconfigurationSidelink message.
  • the reception may be performed, e.g. by the sidelink DRX configuration component 1340 via the reception component 1330 and/or the RF transceiver 1322 in the apparatus 1302 in FIG. 13.
  • the first timing information may include a first starting point and a first ending point for a DRX ON duration within a transmission DRX cycle and the second timing information includes a second starting point and a second ending point for the DRX on duration within a reception DRX cycle.
  • the starting point and ending point may be based on any of the aspects described in connection with FIGs. 5A, 5B, 7, and/or 8.
  • a message 712 may include Tx-Config ([TO, T1J) and/or Rx-Config ([T2,T3]).
  • a message 816 may include Tx-Config ([T4, T5]) and/or Rx-Config ([T6,T7J).
  • the transmission configuration may further include a transmission DRX cycle period for the sidelink transmission from the first UE and the reception configuration further includes a reception DRX cycle period for the sidelink reception by the first UE.
  • the message may further indicate DRX-cycle-period-Tx(T) and RX-cycle- period-Rx(T), e.g., as described in connection with 712 and/or 816 in FIGs. 7 and/or 8
  • the transmission configuration may further include a first offset (e.g., DRX ON offset) for starting the sidelink transmission from the first UE and the reception configuration further includes a second offset (e.g., DRX ON offset) for starting the sidelink reception by the first UE, e.g., as described in connection with 712 and/or 816 in FIGs. 7 and/or 8.
  • a first offset e.g., DRX ON offset
  • a second offset e.g., DRX ON offset
  • the UE transmits a response to the first UE confirming or rejecting the DRX configuration.
  • the response may be transmitted in an RRC message, e.g., indicating that the RRC reconfiguration is complete or is a failure.
  • the transmission may be performed, e.g. by the sidelink DRX configuration response component 1342 via the transmission component 1334 and/or the RF transceiver 1322 in the apparatus 1302 in FIG. 13.
  • FIG. 12 is a flowchart 1200 of a method of wireless communication.
  • the method may be performed by aUE (e.g., the UE 104, 402, 604, 704, 802; the device 310, 350; the apparatus 1302).
  • the method may enable the UE to negotiate directional sidelink DRX configuration.
  • the method may include 1104, 1106, and 1108 from FIG. 11.
  • the UE may transmit, prior to receiving the transmission configuration or the reception configuration at 1004 and 1006, a message to the first UE including at least one of third timing information for the DRX configuration for the sidelink reception from the second UE and fourth timing information for the DRX configuration for the sidelink transmission by the second UE.
  • the transmission may be performed, e.g. by the assistance information component 1344 via the transmission component 1334 and/or the RF transceiver 1322 in the apparatus 1302 in FIG. 13.
  • the message may comprise an RRC radio message including UE assistance information for sidelink, e.g., an “ RRC-UE-Assistance-Info-Sidelink ” message.
  • FIG. 8 illustrates a UE (e.g., UE1 802) transmitting the message 812 with the assistance information prior to receiving the RRC reconfiguration message, e.g., 816, for example.
  • the response may comprise a confirmation of the DRX configuration, such as the RRCReconfigurationCompleteSidelink message, e.g. 716, in FIG. 7 or 820 in FIG. 8.
  • the UE may establish a sidelink connection with the first UE based on the DRX configuration in response to transmitting the confirmation, e.g., as described in connection with FIG. 7.
  • the UE may continue a sidelink connection with the first UE based on the DRX configuration after transmitting the confirmation, e.g., as described in connection with FIG. 8.
  • the response may comprise a confirmation of the DRX configuration, such as the RRCReconfigurationCompleteSidelink message, e.g., 716 in FIG. 7 or 820 in FIG. 8.
  • the UE may transmit, in the response, at least one of an adjusted transmission duration based on the first timing information or an adjusted reception duration based on the second timing information.
  • the UE may transmit an RRCReconfigurationCompleteSidelink message with [TO’, T ] and/or [T2’,T3’], e.g., as described in connection with 716 in FIG. 7 or with 820 in FIG. 8.
  • the UE may establish a sidelink connection with the first UE based on the adjusted transmission duration and the adjusted reception duration received from the first UE after transmitting the confirmation, e.g., as described in connection with FIG. 7.
  • the UE may continue a sidelink connection with the first UE based on the adjusted transmission duration and the adjusted reception, e.g., as described in connection with FIG. 8.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the response may comprise a rejection of the DRX configuration.
  • the UE may transmit, in the response, at least one of fifth timing information (e.g., [T6, T7]) for the DRX configuration for the sidelink transmission from the second UE and sixth timing information (e.g., [T4, T5]) for the DRX configuration for the sidelink reception by the second UE.
  • FIG. 7 illustrates an example of a message 718 that indicates different timing information.
  • FIG. 8 illustrates an example of a message 820 that indicates different timing information.
  • the UE may establish or continue a sidelink connection with the first UE with DRX based on at least one of the third timing information or the fourth timing information, e.g., if the first UE can use the timing information transmitted at 1216.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the UE may establish or continue a sidelink connection with the first UE without DRX based on the first UE not supporting the third timing information or the fourth timing information indicated by the UE.
  • FIG. 7 illustrates an example of the UE2 continuing the connection without DRX, at 722.
  • FIG. 8 illustrates an example of the UE1 continuing the connection without DRX, at 824.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the UE may stop establishment of the sidelink connection with the first UE or release the sidelink connection with the first UE in response to the rejection of the DRX configuration based on the first UE not supporting the third timing information or the fourth timing information indicated by the second UE.
  • FIG. 7 illustrates an example of the UE2 stopping establishment of the connection without DRX, at 722.
  • FIG. 8 illustrates an example of the UE1 releasing the connection without DRX, at 824.
  • the establishment of the sidelink RRC connection may be stopped or the connection may be released by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the UE may receive, from the first UE, different timing information for the sidelink transmission or the sidelink reception of the first UE in response to the rejection.
  • the UE1 may transmit, and UE2 may receive, adjusted timing information [T4’, T5’] and/or [T6 ⁇ T7’].
  • the UE may receive different DRX time information to begin another iteration of the DRX negotiation with the first UE.
  • the reception may be performed, e.g., by the sidelink DRX configuration component 1340 via the reception component 1330 and/or the RF transceiver 1322 of the apparatus 1302 in FIG. 13.
  • the response may comprise a rejection of the DRX configuration, at 1214 without the timing information, at 1216.
  • the UE may establish or continue a sidelink connection, at 1224, with the first UE without DRX in response to the rejection of the DRX configuration.
  • the sidelink RRC connection may be established or continued by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • the response may comprise a rejection of the DRX configuration, at 1214 without the timing information, at 1216, and the UE may stop establishment of a sidelink connection with the first UE or release the sidelink connection with the first UE, at 1226, in response to the rejection of the DRX configuration.
  • the establishment of the sidelink RRC connection may be stopped or the connection may be released by the RRC component 1346 of the apparatus 1302 in FIG. 13.
  • FIG. 13 is a diagram 1300 illustrating an example of a hardware implementation for an apparatus 1302.
  • the apparatus 1302 may be aUE, or another device configured to transmit and/or receive sidelink communication.
  • the apparatus 1302 includes a baseband processor 1304 (also referred to as a modem) coupled to a RF transceiver 1322.
  • the baseband processor 1304 may be a cellular baseband processor and/or the RF transceiver 1322 may be a cellular RF transceiver.
  • the apparatus 1302 may further include one or more subscriber identity modules (SIM) cards 1320, an application processor 1306 coupled to a secure digital (SD) card 1308 and a screen 1310, a Bluetooth module 1312, a wireless local area network (WLAN) module 1314, a Global Positioning System (GPS) module 1316, and/or a power supply 1318.
  • SIM subscriber identity modules
  • SD secure digital
  • GPS Global Positioning System
  • the baseband processor 1304 communicates through the RF transceiver 1322 with the UE 104 and/or BS 102/180.
  • the baseband processor 1304 may include a computer-readable medium / memory.
  • the computer-readable medium / memory may be non-transitory.
  • the baseband processor 1304 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory.
  • the software when executed by the baseband processor 1304, causes the baseband processor 1304 to perform the various functions described in the present application.
  • the computer-readable medium / memory may also be used for storing data that is manipulated by the baseband processor 1304 when executing software.
  • the baseband processor 1304 further includes a reception component 1330, a communication manager 1332, and a transmission component 1334.
  • the communication manager 1332 includes the one or more illustrated components.
  • the components within the communication manager 1332 may be stored in the computer- readable medium / memory and/or configured as hardware within the baseband processor 1304.
  • the baseband processor 1304 may be a component of the device 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359.
  • the apparatus 1302 may be a modem chip and include just the baseband processor 1304, and in another configuration, the apparatus 1302 may be the entire UE (e.g., see 350 of FIG. 3) and include the additional modules of the
  • the communication manager 1332 may include components to perform any of the aspects of FIGs. 7-12. At times, the apparatus may be an initiating UE and at other times may be a responding UE. Thus, the apparatus may be configured to perform the aspects of an initiating UE, e.g., with a different responding UE and may be configured to perform the aspects of a responding UE in response to the initiation of an initiating UE.
  • the communication manager 1332 includes side link DRX configuration component 1340 that is configured to perform any of the aspects of 904, 906, 1028, 1104, 1106, and/or 1228, e.g., as described in connection with any of FIGs. 9-12.
  • the communication manager 1332 further includes a sidelink DRX configuration response component 1342 that is configured to perform any of the aspects of 908, 1010, 1012, 1014, 1016, 1108, 1210, 1212, 1214, and/or 1216, e.g., as described in connection with any of FIGs. 9-12.
  • the communication manager 1332 may further include an assistance information component 1344 that is configured to perform any of the aspects of 1002 and/or 1202, e.g., as described in connection with FIG. 10 or FIG. 12.
  • the communication manager 1332 may further include an RRC component 1346 configured to perform any of the aspects of 1018, 1020, 1022, 1024, 1026, 1218, 1220, 1222, 1224, and/or 1226, e.g., as described in connection with FIG. 10 or FIG. 12.
  • RRC component 1346 configured to perform any of the aspects of 1018, 1020, 1022, 1024, 1026, 1218, 1220, 1222, 1224, and/or 1226, e.g., as described in connection with FIG. 10 or FIG. 12.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts of FIGs. 7-12. As such, each block in the flowcharts of FIGs. 7-12 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • the apparatus 1302 includes means for transmitting, to a second UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the first UE and for transmitting, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE.
  • the apparatus 1302 further includes means for receiving a response from the second UE confirming or rejecting the DRX configuration.
  • the apparatus 1302 may further include means for receiving, prior to transmitting the transmission configuration or the reception configuration, a message from the second UE including at least one of third timing information for the DRX configuration for the sidelink reception from the second UE and fourth timing information for the DRX configuration for the sidelink transmission by the second UE.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the second UE based on the DRX configuration in response to receiving the confirmation.
  • the apparatus 1302 may further include means for receiving, in the response, at least one of an adjusted transmission duration based on the first timing information or an adjusted reception duration based on the second timing information; and means for establishing or continuing a sidelink connection with the second UE with DRX based on the adjusted transmission duration and the adjusted reception duration received from the second UE.
  • the apparatus 1302 may further include means for receiving, in the response, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE; and means for establishing or continuing a sidelink connection with the second UE with DRX based on at least one of the fifth timing information or the sixth timing information received from the second UE.
  • the apparatus 1302 may further include means for receiving, in the response, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the second UE without DRX based on the first UE not supporting the fifth timing information or the sixth timing information indicated by the second UE.
  • the apparatus 1302 may further include means for stopping establishment of the sidelink connection with the second UE or releasing the sidelink connection with the second UE in response to the rejection of the DRX configuration based on the first UE not supporting the fifth timing information or the sixth timing information indicated by the second UE.
  • the apparatus 1302 may further include means for transmitting, to the second UE, different timing information for the sidelink transmission or the sidelink reception of the first UE in response to the rejection.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the second UE without DRX in response to the rejection of the DRX configuration.
  • the apparatus 1302 may further include means for stopping establishment of a sidelink connection with the second UE or releasing the sidelink connection with the second UE in response to the rejection of the DRX configuration.
  • the apparatus 1302 may further include means for receiving, from the first UE, a transmission configuration indicating first timing information for a DRX configuration for sidelink transmission from the first UE and for receiving, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE.
  • the apparatus 1302 may further include means for transmitting a response to the first UE confirming or rejecting the DRX configuration.
  • the apparatus 1302 may further include means for transmitting, prior to receiving the transmission configuration or the reception configuration from the first UE, a message including at least one of third timing information for the DRX configuration for the sidelink reception from the second UE and fourth timing information for the DRX configuration for the sidelink transmission by the second UE.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the first UE based on the DRX configuration in response to receiving the confirmation.
  • the apparatus 1302 may further include means for transmitting, in the response confirming the DRX configuration, at least one of an adjusted transmission duration based on the first timing information or an adjusted reception duration based on the second timing information.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the first UE with DRX based on the adjusted transmission duration and the adjusted reception duration.
  • the apparatus 1302 may further include means for transmitting, in the response confirming the DRX configuration, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE.
  • the apparatus 1302 may further include means for receiving a reconfiguration message from the first UE accepting the at least one of the fifth timing information or the sixth timing information.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the first UE with DRX based on at least one of the fifth timing information or the sixth timing information.
  • the apparatus 1302 may further include means for transmitting, in the response, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE.
  • the apparatus 1302 may further include means for receiving a message from the first UE rejecting the at least one of the fifth timing information or the sixth timing information.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the first UE without DRX, ceasing establishment of the sidelink connection with the first UE, or releasing the sidelink connection with the first UE in response to the message.
  • the apparatus 1302 may further include means for establishing or continuing a sidelink connection with the first UE without DRX.
  • the apparatus 1302 may further include means for stopping establishment of a sidelink connection with the second UE or releasing the sidelink connection with the second UE.
  • the means described above may be one or more of the components of the apparatus 1302 configured to perform the functions recited by the means.
  • the apparatus 1302 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the means.
  • the specific order or hierarchy of blocks in the processes / flowcharts disclosed is an illustration of example approaches. Based upon design preferences, it is understood that the specific order or hierarchy of blocks in the processes / flowcharts may be rearranged. Further, some blocks may be combined or omitted.
  • the accompanying method claims present elements of the various blocks in a sample order, and are not meant to be limited to the specific order or hierarchy presented.
  • Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof’ include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof’ may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.
  • Aspect 1 is a method of wireless communication at a first user equipment (UE), comprising: transmitting, to a second UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; transmitting, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and receiving a response from the second UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • the method of aspect 1 further includes that the transmission configuration with the first timing information and the reception configuration with the second timing information are transmitted in a radio resource control (RRC) message for sidelink RRC reconfiguration.
  • RRC radio resource control
  • the method of aspect 1 or aspect 2 further includes receiving, prior to transmitting the transmission configuration or the reception configuration, a message from the second UE including at least one of third timing information for the DRX configuration for the sidelink reception from the second UE and fourth timing information for the DRX configuration for the sidelink transmission by the second UE.
  • the method of aspect 3 further includes that the message from the second UE comprises a radio resource control (RRC) message including UE assistance information for sidelink.
  • RRC radio resource control
  • the method of any of aspects 1-4 further includes that the first timing information includes a first starting point and a first ending point for a DRX ON duration within a transmission DRX cycle and the second timing information includes a second starting point and a second ending point for the DRX on duration within a reception DRX cycle.
  • the method of any of aspects 1-5 further includes that the transmission configuration further includes a transmission DRX cycle period for the sidelink transmission from the first UE and the reception configuration further includes a reception DRX cycle period for the sidelink reception by the first UE.
  • the method of any of aspects 1-6 further includes that the transmission configuration further includes a first offset for starting the sidelink transmission from the first UE and the reception configuration further includes a second offset for starting the sidelink reception by the first UE.
  • the method of any of aspects 1-7 further includes that the response comprises a confirmation of the DRX configuration, the method further comprising: establishing or continuing a sidelink connection with the second UE based on the DRX configuration in response to receiving the confirmation.
  • the method of any of aspects 1-7 further includes that the response comprises a confirmation of the DRX configuration, the method further comprising: receiving, in the response, at least one of an adjusted transmission duration based on the first timing information or an adjusted reception duration based on the second timing information; and establishing or continuing a sidelink connection with the second UE with DRX based on the adjusted transmission duration and the adjusted reception duration received from the second UE.
  • the method of any of aspects 1-7 further includes that the response comprises a rejection of the DRX configuration, the method further comprising: receiving, in the response, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE; and establishing or continuing a sidelink connection with the second UE with DRX based on at least one of the fifth timing information or the sixth timing information received from the second UE.
  • the method of any of aspects 1-7 further includes that, wherein the response comprises a rejection of the DRX configuration, the method further comprising: receiving, in the response, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE; and in response to the rejection of the DRX configuration, performing one of: establishing or continuing a sidelink connection with the second UE without DRX based on the first UE not supporting the fifth timing information or the sixth timing information indicated by the second UE, stopping establishment of the sidelink connection with the second UE or releasing the sidelink connection with the second UE in response to the rejection of the DRX configuration based on the first EE not supporting the fifth timing information or the sixth timing information indicated by the second UE, or transmitting, to the second UE, different timing information for the sidelink transmission or the sidelink reception of the first UE in response to the rejection.
  • the method of any of aspects 1-7 further includes that the response comprises a rejection of the DRX configuration, the method further comprising: establishing or continuing a sidelink connection with the second UE without DRX in response to the rejection of the DRX configuration.
  • the method of any of aspects 1-7 further includes that the response comprises a rejection of the DRX configuration, the method further comprising: stopping establishment of a sidelink connection with the second UE or releasing the sidelink connection with the second UE in response to the rejection of the DRX configuration.
  • Aspect 14 is a method of wireless communication including receiving discontinuous reception (DRX) information from a first user equipment (UE) at a second UE, comprising: receiving, from the first UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; receiving, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and transmitting a response to the first UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • the method of aspect 14 further includes that the transmission configuration with the first timing information and the reception configuration with the second timing information are received in a radio resource control (RRC) message for sidelink RRC reconfiguration.
  • RRC radio resource control
  • the method of aspect 14 or aspect 15 further includes transmitting, prior to receiving the transmission configuration or the reception configuration from the first UE, a message including at least one of third timing information for the DRX configuration for the sidelink reception from the second UE and fourth timing information for the DRX configuration for the sidelink transmission by the second UE.
  • the method of aspect 16 further includes that the message from the second UE comprises a radio resource control (RRC) message including UE assistance information for sidelink.
  • RRC radio resource control
  • the method of any of aspects 14-17 further includes that the first timing information indicates a first starting point and a first ending point for a first DRX ON duration within a transmission DRX cycle and the second timing information indicates a second starting point and a second ending point for a second DRX ON duration within a reception DRX cycle respectively.
  • the method of any of aspects 14-18 further includes that the transmission configuration further includes a first offset for starting the sidelink transmission from the first UE and the reception configuration further includes a second offset for starting the sidelink reception by the first UE.
  • the method of any of aspects 14-19 further includes that the transmission configuration further includes a transmission DRX cycle period for the sidelink transmission from the first UE and the reception configuration further includes a reception DRX cycle period for the sidelink reception by the first UE.
  • the method of any of aspects 14-19 further includes that the response comprises a confirmation of the DRX configuration, the method further comprising: establishing or continuing a sidelink connection with the first UE based on the DRX configuration in response to receiving the confirmation.
  • the method of any of aspects 14-19 further includes that the response comprises a confirmation of the DRX configuration, the method further comprising: transmitting, in the response confirming the DRX configuration, at least one of an adjusted transmission duration based on the first timing information or an adjusted reception duration based on the second timing information; and establishing or continuing a sidelink connection with the first UE with DRX based on the adjusted transmission duration and the adjusted reception duration.
  • the method of any of aspects 14-19 further includes that the response comprises a rejection of the DRX, the method further comprising: transmitting, in the response confirming the DRX configuration, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE; receiving a reconfiguration message from the first UE accepting the at least one of the fifth timing information or the sixth timing information; and establishing or continuing a sidelink connection with the first UE with DRX based on at least one of the fifth timing information or the sixth timing information.
  • the method of any of aspects 14-19 further includes that the response comprises a rejection of the DRX configuration, the method further comprising: transmitting, in the response, at least one of fifth timing information for the DRX configuration for the sidelink transmission from the second UE and sixth timing information for the DRX configuration for the sidelink reception by the second UE; receiving a message from the first UE rejecting the at least one of the fifth timing information or the sixth timing information; and establishing or continuing a sidelink connection with the first UE without DRX, ceasing establishment of the sidelink connection with the first UE, or releasing the sidelink connection with the first UE in response to the message.
  • the method of any of aspects 14-19 further includes that the response comprises a rejection of the DRX configuration, the method further comprising: establishing or continuing a sidelink connection with the first UE without DRX.
  • the method of any of aspects 14-19 further includes that the response comprises a rejection of the DRX configuration, the method further comprising: stopping establishment of a sidelink connection with the second UE or releasing the sidelink connection with the second UE.
  • Aspect 27 is an apparatus for wireless communication at a first user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: transmit, to a second UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; transmit, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and receive a response from the second UE confirming or rejecting the DRX configuration.
  • a first user equipment UE
  • the memory and the at least one processor of aspect 27 are further configured to perform the method of any of claims 2-13.
  • the apparatus of aspect 27 or 28 further includes at least one transceiver coupled to the at least one processor.
  • Aspect 31 is an apparatus for wireless communication at a first user equipment (UE), comprising: means for transmitting, to a second UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; means for transmitting, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and means for receiving a response from the second UE confirming or rejecting the DRX configuration.
  • UE user equipment
  • the apparatus of aspect 31 further comprises means to perform the method of any of claims 2-13.
  • the apparatus of aspect 31 or 32 further includes at least one transceiver.
  • the apparatus of any of aspects 31-33 further includes at least one antenna.
  • Aspect 35 is a non-transitory computer-readable storage medium storing computer executable code for wireless communication at a first user equipment (UE), the code when executed by a processor cause the processor to: transmit, to a second UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; transmit, to the second UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and receive a response from the second UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • the computer-readable medium of aspect 35 further comprises code to perform the method of any of claims 2-13.
  • Aspect 37 is an apparatus for wireless communication including receiving discontinuous reception (DRX) information from a first user equipment (UE) at a second UE, comprising: a memory; and at least one processor coupled to the memory and configured to: receive, from the first UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; receive, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and transmit a response to the first UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • the memory and the at least one processor of the apparatus in aspect 37 are further configured to perform the method of any of claims 15-26.
  • the apparatus of aspect 37 or 38 further includes at least one transceiver coupled to the at least one processor.
  • the apparatus of any of aspects 37-39 further includes at least one antenna coupled to the at least one processor.
  • Aspect 41 is an apparatus for wireless communication including receiving discontinuous reception (DRX) information from a first user equipment (UE) at a second UE, comprising: means for receiving, from the first UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; means for receiving, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and means for transmitting a response to the first UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • the apparatus of aspect 41 further comprises means to perform the method of any of claims 15-26.
  • the apparatus of aspect 41 or 42 further includes at least one transceiver.
  • the apparatus of any of aspects 41-43 further includes at least one antenna.
  • Aspect 45 is a non-transitory computer-readable storage medium storing computer executable code for wireless communication including receiving discontinuous reception (DRX) information from a first UE at a second UE, the code when executed by a processor cause the processor to: receive, from the first UE, a transmission configuration indicating first timing information for a discontinuous reception (DRX) configuration for sidelink transmission from the first UE; receive, from the first UE, a reception configuration indicating second timing information for the DRX configuration for sidelink reception by the first UE; and transmit a response to the first UE confirming or rejecting the DRX configuration.
  • DRX discontinuous reception
  • the computer-readable medium of aspect 45 further comprises code to perform the method of any of claims 15-26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un premier équipement utilisateur (UE) qui transmet, à un second UE, une configuration de transmission indiquant des premières informations de synchronisation pour une configuration de réception discontinue (DRX) pour une transmission de liaison latérale à partir du premier UE. Le premier UE transmet, au second UE, une configuration de réception indiquant des secondes informations de synchronisation pour la configuration DRX pour une réception de liaison latérale par le premier UE. Le premier UE reçoit une réponse du second UE confirmant ou rejetant la configuration DRX.
PCT/US2022/019387 2021-03-18 2022-03-08 Configuration drx de liaison latérale pour monodiffusion WO2022197492A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280020666.6A CN116982353A (zh) 2021-03-18 2022-03-08 用于单播的侧链路drx配置
EP22713156.2A EP4309425A1 (fr) 2021-03-18 2022-03-08 Configuration drx de liaison latérale pour monodiffusion

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US202163162978P 2021-03-18 2021-03-18
US63/162,978 2021-03-18
US17/653,852 US20220304103A1 (en) 2021-03-18 2022-03-07 Sidelink drx configuration for unicast
US17/653,852 2022-03-07

Publications (1)

Publication Number Publication Date
WO2022197492A1 true WO2022197492A1 (fr) 2022-09-22

Family

ID=80952336

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2022/019387 WO2022197492A1 (fr) 2021-03-18 2022-03-08 Configuration drx de liaison latérale pour monodiffusion

Country Status (1)

Country Link
WO (1) WO2022197492A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021031938A1 (fr) * 2019-08-22 2021-02-25 维沃移动通信有限公司 Procédé et dispositif permettant de configurer un paramètre drx pour une communication de liaison latérale, et appareil terminal
WO2022060201A1 (fr) * 2020-09-18 2022-03-24 엘지전자 주식회사 Procédé et dispositif de synchronisation de drx entre des terminaux en nr v2x
WO2022082639A1 (fr) * 2020-10-22 2022-04-28 Apple Inc. Réception discontinue (drx) de liaison latérale (sl) pour drx à envoi individuel, spécifique à une connexion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021031938A1 (fr) * 2019-08-22 2021-02-25 维沃移动通信有限公司 Procédé et dispositif permettant de configurer un paramètre drx pour une communication de liaison latérale, et appareil terminal
US20220174780A1 (en) * 2019-08-22 2022-06-02 Vivo Mobile Communication Co.,Ltd. Method for configuring drx parameter for sidelink, and terminal device
WO2022060201A1 (fr) * 2020-09-18 2022-03-24 엘지전자 주식회사 Procédé et dispositif de synchronisation de drx entre des terminaux en nr v2x
WO2022082639A1 (fr) * 2020-10-22 2022-04-28 Apple Inc. Réception discontinue (drx) de liaison latérale (sl) pour drx à envoi individuel, spécifique à une connexion

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "DRX for sidelink communications", vol. RAN WG2, no. e-Meeting; 20201102 - 20201113, 22 October 2020 (2020-10-22), XP051941278, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG2_RL2/TSGR2_112-e/Docs/R2-2009231.zip R2-2009231 - DRX for Sidelink communications.docx> [retrieved on 20201022] *
LG ELECTRONICS INC: "Discussion on SL DRX wake-up time alignment between", vol. RAN WG2, no. electronic; 20210125 - 20210205, 15 January 2021 (2021-01-15), XP051974573, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG2_RL2/TSGR2_113-e/Docs/R2-2101706.zip R2-2101706 - Discussion on SL DRX wake-up time alignment between inter-UEs.DOCX> [retrieved on 20210115] *
OPPO: "Discussion on configuration and parameter for sidelink DRX", vol. RAN WG2, no. E-meeting; 20210101, 15 January 2021 (2021-01-15), XP051973473, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG2_RL2/TSGR2_113-e/Docs/R2-2100273.zip R2-2100273 - Discussion on configuration for sidelink DRX.docx> [retrieved on 20210115] *

Similar Documents

Publication Publication Date Title
US11903074B2 (en) Sidelink unicast connection states
US20220110060A1 (en) Resource reservation indication for mode 2 resource allocation with power saving
US11937214B2 (en) Bandwidth part switch for sidelink communication
US20220104180A1 (en) Resource allocation for sidelink discovery
US11751198B2 (en) Discontinuous reception for sidelink
US20220240265A1 (en) Prioritization of inter-ue coordination information
US20220304103A1 (en) Sidelink drx configuration for unicast
US11849439B2 (en) Bandwidth part switch for sidelink communication
US20220046746A1 (en) Discontinuous reception for sidelink
US11696186B2 (en) Periodic resource reservation for serving aperiodic traffic over sidelink
US11695533B2 (en) Sidelink resource pool activation and deactivation for power savings
US11917716B2 (en) Two-stage discovery in sidelink
WO2023107299A1 (fr) Commande de puissance basée sur un faisceau pour liaison latérale
US11937182B2 (en) Sidelink resource allocation with power saving operation
US11799618B2 (en) SL BWP mismatch
WO2022197492A1 (fr) Configuration drx de liaison latérale pour monodiffusion
US11778604B2 (en) MAC-CE for joint sidelink TCI and power control configuration
US20220361196A1 (en) Sidelink resource selection based on inter-ue coordination information
WO2023019382A1 (fr) Adaptation de ressources de sélection aléatoire
US20230132063A1 (en) Enhancements for beamformed sl groupcast over mmw bands
US20240155557A1 (en) Delivery of paging for remote ue via rrc signaling

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22713156

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280020666.6

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2022713156

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2022713156

Country of ref document: EP

Effective date: 20231018