Discontinuous reception for sidelink

Abstract

A wireless device determines a discontinuous reception mode (DRX) for sidelink communications, and performs sidelink activity within a DRX on duration of the DRX mode. The wireless device can transmit a sidelink discovery message including information about the DRX mode of the first wireless device, and can monitor for sidelink communications based on the DRX mode. A second wireless device can receive a sidelink discovery message including information about the DRX mode of the first wireless device from the first wireless device, and can exchange sidelink communications with the first wireless device based on the DRX mode.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit and priority of U.S. Provisional Application No. S / N. 63 / 062,336, filed August 6, 2020, entitled "Discontinuous Reception for Sidelink," and U.S. Patent Application No. 17 / 394,293, filed August 4, 2021, entitled "Discontinuous Reception for Sidelink," both of which are expressly incorporated herein by reference in their entirety.

[0003] introduction

[0004] This disclosure generally relates to communication systems, and more particularly to sidelink communication.

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunications services such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable 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.

[0006] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different wireless devices to communicate at the city, country, region, and even global levels. An example telecommunications standard is 5G New Radio (NR). 5G NR is part of the continuous evolution of mobile broadband, promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT), and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low latency communications (URLLC). Some aspects of 5G NR can be based on the 4G Long Term Evolution (LTE) standard. Some aspects of wireless communication may include direct device-to-device communication based on sidelinks, such as in vehicle-to-everything (V2X) and / or other device-to-device (D2D) communications. There is a need for further improvements to sidelink technologies. These improvements can also be applied to other multiple access technologies and telecommunications standards that employ them.

[0007] Overview

[0008] The following provides a brief overview of one or more aspects to offer a basic understanding of such aspects. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify the key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as an introduction to the more detailed description that follows.

[0009] In another aspect of this disclosure, a method for wireless communication is provided. The method may include: determining resources for sidelink communication during the DRX activation period of a DRX mode; and performing communication on those resources during the DRX activation period of the DRX mode.

[0010] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include: means for determining resources for sidelink communication during the DRX activation period of a DRX mode; and means for communicating on those resources during the DRX activation period of the DRX mode.

[0011] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: determine resources for sidelink communication during the DRX-enabled duration of a DRX mode; and perform communication on those resources during the DRX-enabled duration of the DRX mode.

[0012] In another aspect of this disclosure, a computer-readable storage medium is provided for storing computer-executable code for wireless communication at a first wireless device. For example, the computer-readable storage medium may be non-transient. When executed by a processor, the code causes the processor to: determine resources for sidelink communication during the DRX-enabled period of the DRX mode; and perform communication on those resources during the DRX-enabled period of the DRX mode.

[0013] In one aspect of this disclosure, a method for wireless communication is provided. The method may include: transmitting a sidelink discovery message including information about a first discontinuous reception (DRX) mode of a first wireless device; and monitoring sidelink communication based on the first DRX mode.

[0014] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include: means for transmitting a sidelink discovery message including information about a first discontinuous reception (DRX) mode of a first wireless device; and means for monitoring sidelink communication based on the first DRX mode.

[0015] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: transmit a sidelink discovery message including information about a first DRX mode of a first wireless device; and means for monitoring sidelink communication based on the first DRX mode.

[0016] In another aspect of this disclosure, a computer-readable storage medium is provided for storing computer-executable code for wireless communication at a first wireless device. For example, the computer-readable storage medium may be non-transient. When executed by a processor, the code causes the processor to: transmit a sidelink discovery message including information about a first DRX mode of the first wireless device; and means for monitoring sidelink communication based on the first DRX mode.

[0017] In another aspect of this disclosure, a method for wirelessly communicating with a first wireless device at a second wireless device is provided. The method may include: receiving from the first wireless device a sidelink discovery message including information about a first DRX mode of the first wireless device; and exchanging sidelink communication with the first wireless device based on the first DRX mode.

[0018] In another aspect of this disclosure, an apparatus for wirelessly communicating with a first wireless device at a second wireless device is provided. The apparatus may include: means for receiving from the first wireless device a sidelink discovery message including information about a first DRX mode of the first wireless device; and means for exchanging sidelink communication with the first wireless device based on the first DRX mode.

[0019] In another aspect of this disclosure, an apparatus for wirelessly communicating with a first wireless device at a second wireless device is provided. The apparatus may include a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: receive from the first wireless device a sidelink discovery message including information about a first DRX mode of the first wireless device; and exchange sidelink communication with the first wireless device based on the first DRX mode.

[0020] In another aspect of this disclosure, a computer-readable storage medium is provided for storing computer-executable code for wirelessly communicating with a first wireless device at a second wireless device. For example, the computer-readable storage medium may be non-transient. When executed by a processor, the code causes the processor to: receive a sidelink discovery message from the first wireless device including information about a first DRX mode of the first wireless device; and exchange sidelink communication with the first wireless device based on the first DRX mode.

[0021] In another aspect of this disclosure, a method for wireless communication is provided. The method may include: receiving from a base station a resource allocation for sidelink communication based on mode 1 resource allocation; and transmitting or receiving sidelink communication during a DRX activation period configured by the mode 1 resource allocation.

[0022] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include: means for receiving from a base station a resource allocation for sidelink communication based on mode 1 resource allocation; and means for transmitting or receiving sidelink communication during the DRX activation period of a DRX configuration based on mode 1 resource allocation.

[0023] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: receive from a base station a resource allocation for sidelink communication based on a mode 1 resource allocation; and transmit or receive sidelink communication during a DRX-configured DRX activation period based on the mode 1 resource allocation.

[0024] In another aspect of this disclosure, a computer-readable storage medium is provided for storing computer-executable code for wireless communication at a first wireless device. For example, the computer-readable storage medium may be non-transient. When executed by a processor, the code causes the processor to: receive from a base station a resource allocation for sidelink communication based on a mode 1 resource allocation; and transmit or receive sidelink communication during the DRX-enabled duration of the DRX configuration based on the mode 1 resource allocation.

[0025] In another aspect of this disclosure, a method for wireless communication is provided. The method may include: determining a discontinuous reception mode for sidelink communication; and performing sidelink activities during the DRX activation duration of the DRX mode.

[0026] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include: means for determining a discontinuous reception mode for sidelink communication; and means for performing sidelink activities during the DRX activation duration of a DRX mode.

[0027] In another aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to: determine a discontinuous reception mode for sidelink communication; and perform sidelink activities during the DRX activation duration of the DRX mode.

[0028] In another aspect of this disclosure, a computer-readable medium is provided that stores computer-executable code for wireless communication at a first wireless device. For example, the computer-readable medium may be non-transient. When executed by a processor, the code causes the processor to: determine a discontinuous reception mode for sidelink communication; and perform sidelink activities during the DRX activation duration of the DRX mode.

[0029] To achieve the foregoing and related objectives, these one or more aspects include the features fully described below and specifically pointed out in the claims. Certain illustrative features of these one or more aspects are set forth in detail in the following description and drawings. However, these features merely indicate a few of the various ways in which the principles of these various aspects may be employed, and this description is intended to cover all such aspects and their equivalents. Brief description of the attached diagram

[0031] Figure 1 This is a diagram illustrating an example of a wireless communication system and access network that includes devices communicating based on sidelinks.

[0032] Figure 2 The various aspects of the example-side link time slot structure were explained.

[0033] Figure 3 This is a diagram illustrating an example of a first and a second device configured to perform wireless communication, including sidelink communication.

[0034] Figure 4 The example sidelink communication system was explained.

[0035] Figure 5 An example of extended discontinuous reception (DRX) including DRX enable duration is explained.

[0036] Figure 6 Examples of resource allocation for sense-based sidelink communication are explained.

[0037] Figure 7 Examples of partial sensing used for sidelink resource allocation are explained.

[0038] Figure 8 Examples of different DRX cycles for sidelink UEs are explained.

[0039] Figure 9 An example of coordination between different DRX cycles for a sidelink UE is explained.

[0040] Figure 10 An example of the limitations on the extended duration of DRX activation for sidelink activities is explained.

[0041] Figure 11A and11B This is an example communication flow between sidelink devices, including at least one device operating using DRX.

[0042] Figure 12A This is a flowchart of a method for wireless communication including DRX for side links.

[0043] Figure 12B This is a flowchart of a method for wireless communication including DRX for side links.

[0044] Figure 13A This is a flowchart of a method for wireless communication with a device using DRX for sidelinks.

[0045] Figure 13B This is a flowchart of a method for wireless communication with a device using DRX for sidelinks.

[0046] Figure 14 This is a diagram illustrating an example of the hardware implementation of the example device.

[0047] Figure 15 This is a flowchart of a method for wireless communication with a device using DRX for sidelinks.

[0048] Figure 16 An example of resource reservation based on DRX mode is explained.

[0049] Figure 17 This is a flowchart of a method for wireless communication with a device using DRX for sidelinks.

[0050] Figure 18A This is a flowchart of a method for wireless communication with a device using DRX for sidelinks.

[0051] Figure 18B This is a flowchart of a method for wireless communication with a device using DRX for sidelinks.

[0052] Detailed description

[0053] The detailed description that follows, taken in conjunction with the accompanying drawings, is intended as a description of various configurations and is not intended to represent only the configurations in which the concepts described herein can be practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0054] Several aspects of a telecommunications system will now be described with reference to various apparatuses and methods. These apparatuses and methods will be described in detail below and explained in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0055] As an example, an element, or any part of an element, or any combination of elements, may be implemented as a processing system comprising one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, system-on-a-chip (SoCs), baseband processors, field-programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuitry, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. One or more processors in the processing system may execute software. Software should be broadly interpreted as instructions, instruction sets, code, code segments, program code, programs, subroutines, 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 languages, or other terms.

[0056] Accordingly, in one or more examples, the described functionality can be implemented in hardware, software, or any combination thereof. If implemented in software, the functionality can be stored or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available medium accessible to a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of these types of computer-readable media, or any other medium capable of being used to store computer-executable code in the form of instructions or data structures accessible to a computer.

[0057] While aspects are described herein by way of example, those skilled in the art will understand that additional implementations and use cases may arise in many different arrangements and scenarios. The aspects described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and package arrangements. For example, implementations and / or devices may arise via integrated chip implementations and other non-modular component-based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / shopping devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specific to particular use cases or applications, broad applicability of the described aspects is possible. Implementations can range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described aspects. In some practical settings, devices incorporating the described aspects and features may also include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals requires several components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The innovations described herein are intended to be implemented in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or decomposed components, end-user equipment, etc., of various sizes, shapes, and configurations.

[0058] UEs can reduce power consumption through discontinuous reception (DRX), in which the UE monitors or transmits communications during the DRX-on period and does not monitor or transmit communications during the DRX-off period. The DRX-off period may correspond to the time during which the UE operates in low-power mode, sleep mode, etc. In some examples, the UE can perform sensing in a discontinuous manner, which may be referred to as partial sensing. The UE can use an on / off mode in which the UE periodically performs sensing for resource allocation purposes (e.g., during sensing periods) and does not monitor sidelink reservation signals at other times (e.g., during non-sensing time periods). For example, the UE may perform sensing only during the on period and may skip sensing during the off period. By having periods during which the UE does not monitor or transmit communications, the UE can save power or extend battery life. However, sidelink communication exchanged directly between devices may rely on discovery messages for sidelink UEs to find nearby UEs, or it may rely on sensing of resource reservations made by other UEs to select resources for transmission. UEs that do not perform sensing during the DRX shutdown period may miss discovery messages or resource reservations from other UEs during that time. If multiple UEs are operating in different DRX modes, discovery between UEs may become even more difficult.

[0059] Depending on one or more aspects, the UE may provide information about its DRX mode in a broadcast announcement message and / or in a response to a sidelink discovery message. The UE may monitor sidelink communication based on this DRX mode. The UE may be a first UE, and a second UE may use the DRX mode received from the first UE to transmit communication to the first UE during the first UE's DRX activation period. In some examples, both UEs may operate based on DRX, and the two UEs may transmit sidelink communication to each other during times falling within the DRX activation period for both UEs.

[0060] In some examples, the UE can perform sidelink activities, such as transmitting, receiving, sensing, or reserving resources, within the DRX-enabled duration of the UE's DRX mode, for example, without extending the DRX-enabled duration. For instance, the UE can postpone retransmissions that occur outside the DRX-enabled duration until the UE's next DRX-enabled duration. The UE can reserve resources for sidelink transmissions within the current DRX-enabled duration and / or in a later DRX-enabled duration.

[0061] The aspects presented herein provide a method for improving the discovery of nearby sidelink devices by enabling the UE to provide information about its DRX mode for sidelink communication, using DRX or partial sensing operations for UE sidelink communication. The UE may be referred to as a DRX UE. The receiving UE can use information about the DRX mode of the DRX UE to monitor communication from and / or transmit communication to the DRX UE, which improves the likelihood that the sidelink communication will be received by the DRX UE. This communication has a higher probability of being received by the DRX UE because it is transmitted while the DRX UE is monitoring the communication, and avoids the DRX-off duration that the DRX UE might be in when it is not monitoring the communication.

[0062] Figure 1 This is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also known as a wireless wide area network (WWAN)) includes base station 102, UE 104, evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). Base station 102 may include macrocells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macrocells include base stations. Small cells include femtocells, picocells, and microcells.

[0063] For example, the Uu interface can be used to establish an access link between UE 104 and base station 102 or 180. Other communications can be exchanged between wireless devices based on sidelinks. For example, some UEs 104 can communicate directly with each other using device-to-device (D2D) communication link 158. In some examples, D2D communication link 158 can use DL / UL WWAN spectrum. D2D communication link 158 can use one or more sidelink channels, such as Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Discovery Channel (PSDCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Control Channel (PSCCH). D2D communication can be achieved through a wide variety of wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

[0064] Examples of sidelink communication may include vehicle-based communication devices communicating based on: vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I) (e.g., from a vehicle-based communication device to a road infrastructure node, such as a roadside unit (RSU)), vehicle-to-network (V2N) (e.g., from a vehicle-based communication device to one or more network nodes, such as a base station), vehicle-to-pedestrian (V2P), cellular vehicle-to-everything (CV2X), and / or combinations thereof and / or communications with other devices, collectively referred to as vehicle-to-everything (V2X) communication. Sidelink communication may be based on V2X or other D2D communication, such as Proximity Services (ProSe). Besides the UE, sidelink communication may also be transmitted and received by other transmitting and receiving devices, such as roadside units (RSU) 107. The PC5 interface can be used to exchange sidelink communication, such as in combination with... Figure 2 The examples described in [the document] are as follows. Although including [other examples]... Figure 2 The following description of an example time slot structure provides an example of sidelink communication in conjunction with 5G NR, but the concepts described herein can be applied to other similar fields such as LTE, LTE-A, CDMA, GSM and other wireless technologies.

[0065] UE 104 may include a sidelink DRX component 198 configured to exchange sidelink communications with other sidelink devices. The sidelink DRX component 198 may be configured to transmit a sidelink discovery message (such as an announcement message, a connection request, or a response to a connection request) including information about a first DRX mode of the UE. The sidelink DRX component 198 may be configured to monitor sidelink communications based on the first DRX mode. The sidelink DRX component may be configured to receive information about a second DRX mode from another UE 104 (such as in a response to an announcement message or a connection request). The sidelink DRX component 198 may be configured to communicate with the other UE 104 based on resources shared by the two DRX modes.

[0066] Base station 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with EPC 160 via a first backhaul link 132 (e.g., S1 interface). Base station 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) can interface with core network 190 via a second backhaul link 184. Among other functions, base station 102 can also perform one or more of the following functions: user data delivery, radio channel cryptography and cryptography decoding, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of Non-Access Stratum (NAS) messages, NAS node selection, synchronization, Radio Access Network (RAN) sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and equipment tracking, RAN Information Management (RIM), paging, location, and delivery of alarm messages. Base station 102 can communicate with each other directly or indirectly (e.g., via EPC 160 or core network 190) on third backhaul link 134 (e.g., X2 interface). First backhaul link 132, second backhaul link 184 and third backhaul link 134 can be wired or wireless.

[0067] Base station 102 can wirelessly communicate with UE 104. Each base station 102 can provide communication coverage for its respective geographical coverage area 110. Overlapping geographical coverage areas 110 may exist. For example, small cell 102' may have a coverage area 110' that overlaps with the coverage areas 110 of one or more macro base stations 102. A network that includes both small cells and macro cells may be referred to as a heterogeneous network. The heterogeneous network may also include a Home Evolved B Node (eNB) (HeNB) that can provide services to a restricted group called a Closed Subscriber Group (CSG). The communication link 120 between base station 102 and UE 104 may include uplink (UL) (also known as reverse link) transmission from UE 104 to base station 102 and / or downlink (DL) (also known as forward link) transmission from base station 102 to UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna technologies, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links may use one or more carriers. For each carrier allocated in a carrier cluster totaling up to Yx MHz (x component carriers) for transmission in each direction, base station 102 / UE 104 may use a spectrum with a bandwidth of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.). These carriers may or may not be adjacent to each other. Carrier allocation may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL). Component carriers may include primary component carriers and one or more secondary component carriers. The primary component carrier may be referred to as the primary cell (PCell), and the secondary component carriers may be referred to as secondary cells (SCells).

[0068] The wireless communication system may further include a Wi-Fi access point (AP) 150 communicating with a Wi-Fi station (STA) 152 via a communication link 154, for example, in an unlicensed spectrum of 5 GHz. When communicating in unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) before communication to determine whether the channel is available.

[0069] Small cell 102' can operate in licensed and / or unlicensed spectrum. When operating in unlicensed spectrum, small cell 102' can employ NR and use the same unlicensed spectrum (e.g., 5 GHz, etc.) used by Wi-Fi AP 150. Small cell 102' employing NR in unlicensed spectrum can enhance access network coverage and / or increase access network capacity.

[0070] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc., based on frequency / wavelength. In 5G NR, two initial operating bands have been designated as frequency ranges FR1 (410 MHz – 7.125 GHz) and FR2 (24.25 GHz – 52.6 GHz). The frequencies between FR1 and FR2 are generally referred to as the mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, in various documents and articles, FR1 is often (interchangeably) referred to as the “sub-6 GHz band.” Similar naming issues sometimes arise regarding FR2, although it differs from the Extremely High Frequency (EHF) band (30 GHz – 300 GHz) designated as the “millimeter wave” band by the International Telecommunication Union (ITU), FR2 is often (interchangeably) referred to as the millimeter wave band in various documents and articles.

[0071] The frequencies between FR1 and FR2 are generally referred to as intermediate frequency (IF) bands. Recent 5G NR studies have identified the operating bands of these IF bands as the frequency range designation FR3 (7.125 GHz – 24.25 GHz). Bands falling within FR3 can inherit FR1 and / or FR2 characteristics, thus effectively extending the features of FR1 and / or FR2 into the IF band. Additionally, higher frequency bands are currently being explored to extend 5G NR operation above 52.6 GHz. For example, three higher operating frequency bands have been identified as the frequency range designations FR4a or FR4-1 (52.6 GHz – 71 GHz), FR4 (52.6 GHz – 114.25 GHz), and FR5 (114.25 GHz – 300 GHz). Each of these higher frequency bands falls within the EHF band.

[0072] In light of the foregoing, unless otherwise stated, it should be understood that, as used herein, the term "sub-6 GHz" and the like can broadly refer to frequencies less than 6 GHz, within FR1, or including intermediate frequency band frequencies. Furthermore, unless otherwise stated, it should be understood that, as used herein, the term "millimeter wave" and the like can broadly refer to frequencies that can include intermediate frequency band frequencies, within FR2, FR4, FR4-a or FR4-1 and / or FR5, or within the EHF band.

[0073] Whether it is a small cell 102' or a large cell (e.g., a macro base station), base station 102 may include and / or be referred to as an eNB, gB node (gNB), or another type of base station. Some base stations (such as gNB 180) may operate in conventional sub-6 GHz spectrum, millimeter wave frequencies, and / or near-millimeter wave frequencies to communicate with UE 104. When gNB 180 operates in millimeter wave frequencies or near-millimeter wave frequencies, gNB 180 may be referred to as a millimeter wave base station. Millimeter wave base station 180 may utilize beamforming 182 with UE 104 to compensate for path loss and short range. Base station 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming. Similarly, beamforming can be applied, for example, to sidelink communication between UEs.

[0074] Base station 180 may transmit beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182''. UE 104 may also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 may receive beamformed signals from UE 104 in one or more receive directions. Base station 180 / UE 104 may perform beam training to determine the optimal receive and transmit directions for each of base station 180 / UE 104. The transmit and receive directions of base station 180 may be the same or different. The transmit and receive directions of UE 104 may be the same or different. Although this example has been described with respect to base station 180 and UE 104, similar aspects may be applied between a first device and a second device (e.g., a first UE and a second UE) for sidelink communication.

[0075] EPC 160 may include Mobility Management Entity (MME) 162, other MMEs 164, Serving Gateway 166, Multimedia Broadcast Multicast Service (MBMS) Gateway 168, Broadcast Multicast Service Center (BM-SC) 170, and Packet Data Network (PDN) Gateway 172. MME 162 may communicate with Home Subscriber Server (HSS) 174. MME 162 is the control node that handles signaling between UE 104 and EPC 160. Generally, MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are delivered through Serving Gateway 166, which is itself connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation and other functions. PDN Gateway 172 and BM-SC 170 are connected to IP Service 176. IP Service 176 may include the Internet, intranet, IP Multimedia Subsystem (IMS), PS streaming service, and / or other IP services. The BM-SC 170 provides functionality for MBMS user service provisioning and delivery. The BM-SC 170 can serve as an entry point for content provider MBMS transmissions, authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and schedule MBMS transmissions. The MBMS gateway 168 can be used to distribute MBMS traffic to base station 102 within a Broadcast-Specific Service Single Frequency Network (MBSFN) area, and can be responsible for session management (start / stop) and collecting eMBMS-related billing information.

[0076] The core network 190 may include Access and Mobility Management Functions (AMF) 192, other AMFs 193, Session Management Functions (SMF) 194, and User Plane Functions (UPF) 195. AMF 192 may communicate with Unified Data Management (UDM) 196. AMF 192 is the control node that handles signaling between UE 104 and the core network 190. Generally, AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are transmitted through UPF 195. UPF 195 provides UE IP address allocation and other functions. UPF 195 connects to IP services 197. IP services 197 may include the Internet, intranet, IP Multimedia Subsystem (IMS), Packet Switched (PS) Streaming (PSS) services, and / or other IP services.

[0077] Base stations may include and / or be referred to as gNB, B-node, eNB, access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmit / receive point (TRP), or some other suitable term. Base station 102 provides UE 104 with access to EPC 160 or core network 190. Examples of UE 104 include cellular phones, smartphones, Session Initiation Protocol (SIP) phones, laptop devices, personal digital assistants (PDAs), satellite radios, GPS devices, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet devices, smart devices, wearable devices, vehicles, electricity meters, gas pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, or any other similar functional devices. Some UE 104 may be referred to as IoT devices (e.g., parking timers, oil pumps, ovens, vehicles, heart monitors, etc.). UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, radio terminal, remote terminal, handheld device, user agent, mobile client, client, or some other suitable term.

[0078] Figure 2 Examples of time slot structures, including illustrations of aspects that can be used for sidelink communication (e.g., between UE 104, RSU 107, etc.), are shown in Figures 200 and 210. In some examples, the time slot structure may be within a 5G / NR frame structure. In other examples, the time slot structure may be within an LTE frame structure. Although the following description may focus on 5G NR, the concepts described herein are applicable to other similar domains, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies. Figure 2The example time slot structure in the diagram is merely an example, and other sidelink communications may have different frame structures and / or different channels for sidelink communication. A frame (10 ms) can be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-time slots, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, while for time slot configuration 1, each time slot may include 7 symbols. Figure 200 illustrates a single resource block for a single time slot transmission, for example, this single time slot transmission may correspond to a 0.5 ms transmission time interval (TTI). The physical sidelink control channel can be configured to occupy multiple physical resource blocks (PRBs), for example, 10, 12, 15, 20, or 25 PRBs. The PSCCH can be limited to a single subchannel. For example, the PSCCH duration can be configured to 2 or 3 symbols. For example, subchannels may include 10, 15, 20, 25, 50, 75, or 100 PRBs. Resources for sidelink transmissions may be selected from a resource pool that includes one or more subchannels. As a non-limiting example, a resource pool may include between 1 and 27 subchannels. A PSCCH size may be established for the resource pool, for example, between 10% and 100% of the duration of one subchannel for 2 or 3 symbols. Figure 2 Figure 210 illustrates an example where the PSCCH occupies approximately 50% of a subchannel, serving as an example to illustrate the concept of PSCCH occupies a subchannel. The Physical Sidelink Shared Channel (PSSCH) occupies at least one subchannel. In some examples, the PSCCH may include a first portion of Sidelink Control Information (SCI), and the PSSCH may include a second portion of the SCI.

[0079] A resource grid can be used to represent frame structure. Each time slot may include a resource block (RB) (also called a physical RB (PRB)) extending for 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. Figure 2 As explained, some REs may include control information in the PSCCH and some REs may include demodulation RS (DMRS). At least one symbol may be used for feedback. Figure 2An example of a two-symbol structure for a Physical Side-Link Feedback Channel (PSFCH) with adjacent gap symbols is explained. Symbols before and / or after the feedback can be used to transition between data reception and feedback transmission. This gap allows the device to (e.g., in a subsequent time slot) switch from operating as a transmitting device to preparing to operate as a receiving device. As explained, data can be transmitted in the remaining REs. This data may include the data message described herein. The positions of any of the data, DMRS, SCI, feedback, gap symbols, and / or LBT symbols may be related to... Figure 2 The examples described in the text differ. In some respects, multiple time slots can be grouped together.

[0080] Figure 3 This is block diagram 300 showing a first wireless communication device 310 communicating with a second wireless communication device 350 via a sidelink. In some examples, devices 310 and 350 may communicate based on V2X or other D2D communication. This communication may be based on a sidelink using a PC5 interface. Devices 310 and 350 may include UEs, RSUs, base stations, etc. Packets may be provided to a controller / processor 375 that implements Layer 3 and Layer 2 functionality. Layer 3 includes the Radio Resource Control (RRC) layer, and Layer 2 includes the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Media Access Control (MAC) layer.

[0081] Transmit (TX) processor 316 and receive (RX) processor 370 implement Layer 1 functionality associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. TX processor 316 processes the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The encoded 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., a pilot) in the time and / or frequency domains, and subsequently combined using inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time-domain OFDM symbol stream. The OFDM streams are spatially precoded to produce multiple spatial streams. The channel estimate from channel estimator 374 can be used to determine coding and modulation schemes and for spatial processing. This channel estimate can be derived from a reference signal transmitted by device 350 and / or channel condition feedback. Each spatial stream can then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX can use the corresponding spatial stream to modulate an RF carrier for transmission.

[0082] At device 350, each receiver 354RX receives signals via its respective antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides this information to the receive (RX) processor 356. The TX processor 368 and RX processor 356 implement Layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on this information to recover any spatial stream destined for device 350. If multiple spatial streams are destined for device 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then uses a Fast Fourier Transform (FFT) to transform the OFDM symbol stream from the time domain to the frequency domain. The frequency domain signal consists of a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, along with the reference signal, are recovered and demodulated by determining the signal constellation points most likely to have been transmitted by device 310. These soft decisions can be based on a channel estimate calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the original data and control signals transmitted by device 310 over the physical channel. This data and control signals are then provided to the controller / processor 359 that implements layer 3 and layer 2 functionality.

[0083] The controller / processor 359 may be associated with a memory 360 that stores program code and data. The memory 360 may be referred to as a computer-readable medium. The controller / processor 359 can provide demultiplexing, packet reassembly, ciphertext decoding, header decompression, and control signal processing between transmission and logical channels. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operation.

[0084] Similar to the functionality described in conjunction with the transmissions performed by device 310, controller / processor 359 can provide RRC layer functionality associated with system information (e.g., MIB, SIB) capture, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression and security (cryptography, cryptographic decoding, integrity protection, integrity verification); RLC layer functionality associated with the transmission of upper-layer PDUs, error correction via ARQ, concatenation, segmentation and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel priority ordering.

[0085] The channel estimate derived by the channel estimator 358 from the reference signal or feedback transmitted by the device 310 can be used by the TX processor 368 to select an appropriate coding and modulation scheme and to facilitate spatial processing. The spatial stream generated by the TX processor 368 can be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX can use the corresponding spatial stream to modulate an RF carrier for transmission.

[0086] Transmissions are processed at device 310 in a manner similar to that described for the receiver function at device 350. Each receiver 318RX receives signals via its corresponding antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides that information to the RX processor 370.

[0087] The controller / processor 375 may be associated with a memory 376 that stores program code and data. The memory 376 may be referred to as a computer-readable medium. The controller / processor 375 provides demultiplexing, packet reassembly, ciphertext decoding, header decompression, and control signal processing between transmission and logical channels. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operation.

[0088] At least one of the following: TX processor 368, RX processor 356, controller / processor 359, TX processor 316, RX processor 370, or controller / processor 375 may be configured to perform combined operations. Figure 1 Various aspects of the sidelink DRX component 198. For example, the sidelink DRX component 198 can be configured to provide information about the DRX mode used for sidelink communication to other devices, or to receive DRX information for sidelink communication from other devices. The sidelink DRX component 198 can monitor or transmit sidelink communication based on the DRX mode information.

[0089] Figure 4 Example 400 illustrates wireless communication between devices based on sidelink communication. Communication can be based on, among other things... Figure 2The time slot structure is described in various aspects. For example, transmitting UE 402 may transmit transmission 414 (e.g., including a control channel and / or a corresponding data channel), which may be received by receiving UEs 404, 406, and 408. The control channel may include information for decoding the data channel and may also be used by the receiving devices to avoid interference by suppressing transmissions on occupied resources during data transmission. The number of TTIs and RBs that the data transmission will occupy may be indicated in the control message from the transmitting device. In addition to being able to operate as receiving devices, UEs 402, 404, 406, and 408 may also be able to operate as transmitting devices. Therefore, UEs 406 and 408 are interpreted as transmitting transmissions 416 and 420. Transmissions 414, 416, and 420 may be broadcast or multicast to nearby devices. For example, UE 414 may transmit communications intended to be received by other UEs within range 401 of UE 414. Additionally or alternatively, RSU 407 may receive communications from UEs 402, 404, 406, 408 and / or transmit communications 418 to UEs 402, 404, 406, 408.

[0090] For some UEs, such as vehicle UEs (VUEs), the UE may receive a larger amount of battery power, and power savings may not be as important as other factors. For example, a VUE can continuously sense sidelink resources (such as resource pools) to identify resources reserved by other UEs, whether for receiving sidelink communication from other UEs or for selecting from available resources for sidelink transmissions. For other UEs, power savings and longer battery life may be more important.

[0091] As presented herein, UEs 402, 404, 406, or 408 can reduce power consumption through DRX. In DRX, UEs 402, 406, 406, or 408 monitor or transmit communications during the DRX enable duration and do not monitor or transmit communications during the DRX disable duration. For example, the UE can use sleep and wake-up cycles to discontinuously monitor sidelink control information (SCI). The DRX disable duration can correspond to the time the UE operates in low-power mode, sleep mode, etc. During the DRX disable duration, the UE can disable, shut down, or not use radio frequency (RF) functions. DRX modes can include one or more timers or values, such as enable duration timers or values ​​indicating the start point of the DRX enable and / or DRX disable durations. Enable duration timers can indicate time periods, for example, in consecutive symbols, time slots, subframes, or TTIs, during which the UE wakes from the disable duration and monitors control signaling. DRX cycles can include periodic repetitions of DRX enable and DRX disable durations.

[0092] By having periods during which the UE does not monitor or transmit communications, the UE can save power or extend battery life. For example, DRX for sidelinks can provide power savings, for instance, at the physical layer or media access control (MAC) layer. Power savings can be helpful in sidelink applications such as shared security applications, business applications, and wearable devices.

[0093] DRX can also be used by the UE for communication on link 120 (e.g., cellular link, access link, or Uu link) between UE 104 and base station 102 or 180, such as Figure 1 As explained, base station 102 or 180 can configure UE 104 using DRX configuration. The base station can configure DRX parameters such as DRX cycling and DRX activation duration for the UE. Additionally, base station 102 or 180 can schedule communication with UE 104 based on the UE's DRX configuration, because the base station is aware of the DRX settings provided to UE 104 by base station 102 or 180. Figure 5 An example of a DRX cycle 500 that can be configured by base station 102 or 180 for UE 104 using access link 120 with the base station is explained. UE 104 can monitor PDCCH from base station 102 or 180 during the DRX on duration and can skip monitoring of PDCCH during the DRX off duration. If the UE receives PDCCH during the on duration, as explained at 502, the UE can remain awake for an extended period based on an inactive timer started upon receiving the PDCCH. If UE 104 does not receive downlink communication from base station 102 or 180 during the duration of the inactive timer, the UE can stop monitoring for the remaining DRX off duration, for example, by entering sleep mode or low-power mode.

[0094] However, sidelink communication exchanged directly between devices may rely on discovery messages for the sidelink UE to find nearby UEs, or may involve resource selection based on sensing (e.g., receiving) of resource reservations made by other UEs for selecting resources for transmission. Sidelink communication can be based on different types or modes of resource allocation mechanisms. In a first resource allocation mode (which may be referred to herein as "Mode 1"), centralized resource allocation can be provided. For example, base station 102 or 180 can determine resources for sidelink communication and allocate resources for different UEs 104 to use for sidelink transmission. In this first mode, the sidelink UE receives sidelink resource allocations from base station 102 or 180. In a second resource allocation mode (which may be referred to herein as "Mode 2"), distributed resource allocation can be provided. In Mode 2, each UE can autonomously determine the resources to be used for sidelink transmission. To coordinate the selection of sidelink resources by individual UEs, each UE can use sensing techniques to monitor resource reservations of other sidelink UEs and can select resources for sidelink transmission from unreserved resources.

[0095] Figure 6 An example of resource allocation based on Sensing 600 is explained. A UE can perform sensing by monitoring a SCI from another UE, which indicates resources that the other UE intends to use for transmitting sidelink transmissions. The resources indicated by the SCI can be described as reserved sidelink resources. The SCI may include resource reservation information of the UE using the SCI and / or may include reservation information associated with other UEs, such as in inter-UE coordination information. The indicated resources may be referred to as sidelink reservations. Figure 6 As shown at 602, the UE can monitor a set of frequency resources over a time window. The frequency range can be based on a set of resources used for sidelink communication. The time and frequency resources used for sidelink communication can be referred to as a resource pool. The UE can determine the available resources in the resource pool based on the remaining resources that are not reserved. In some examples, the UE may reserve resources if the measurement of the corresponding SCI received within the sensing window is below a threshold (such as an RSRP threshold or other signal strength threshold).

[0096] After resource selection is triggered, at step 604, the UE can select a resource from the available resources in the resource pool for transmission. For example, resource selection can be triggered by the UE having data for transmission. Figure 6 Example resource pool 606 is explained, as well as the resources selected by the UE from the available resources not reserved by the SCI received during the sensing window.

[0097] In some examples, the UE can continuously sense retention from other UEs. In other examples, the UE can perform sensing in a discontinuous manner, which may be referred to as partial sensing. Figure 7An example of partial sensing 700 performed by the UE in a discontinuous manner is explained. The UE can use an on / off mode in which it periodically performs sensing for resource allocation purposes (e.g., during a sensing period) and does not monitor sidelink hold signals at other times (e.g., during the non-sensing period). For example, the UE can perform sensing only during the on period and can skip sensing during the off period.

[0098] During the DRX off period, UEs operating using DRX for sidelinks will miss reserved resources from other UEs and / or SCIs attempting to communicate with them. DRX is an example of how UEs implement partial sensing, for example, by sensing during the DRX on period and sleeping (or not sensing) during the DRX off period.

[0099] To determine the presence of a sidelink device, the first sidelink device may transmit a discovery message. The discovery message may include an announcement message. The first UE may broadcast an announcement message indicating its presence as a sidelink device to other sidelink devices within its transmission range. For example, Figure 4 UE 402 can broadcast an announcement message that can be received by UEs 404 and 406, as well as other sidelink devices (such as RSU 407), within UE 402's transmission range 401. A sidelink UE (such as UE 404) receiving the announcement message can respond to a first UE (e.g., UE 402) with the message. After discovering each other, UEs 402 and 404 can exchange sidelink communications. The UE transmitting the announcement message can be referred to as the announcing UE. The UE transmitting the response can be referred to as the monitoring UE. The discovery type involving broadcasting announcements and responses can be referred to as the first discovery model, or "Model A" sidelink discovery.

[0100] In another type of sidelink discovery, a first UE (e.g., UE 402) may transmit a message including a discovery request for a sidelink device. The UE transmitting the discovery request may be referred to as the discovering UE. A UE receiving the discovery request (e.g., UE 404) may process the request and transmit a response to the UE that transmitted the discovery request. The UE transmitting the response may be referred to as the discovered UE. This type of discovery, including the discovery request message, may be referred to as a second discovery type or "Mode B" sidelink discovery. In Mode A, an announcement message informs other sidelink UEs "I am here," while in Mode B, the discovery request asks or indicates to nearby sidelink devices "Who is there?" or "Are you there?".

[0101] UEs in the DRX-off period will not only miss resource reservations but also messages from other UEs (e.g., discovery messages or communication messages). Discovery and communication between UEs can become more difficult if multiple UEs operate using different DRX modes. In some examples, UEs can monitor or sense discovery pools without performing DRX; for example, each UE can monitor a discovery resource pool. A discovery pool may include periodic time and frequency resources, such as resources appearing every 40ms, every 100ms, etc. During this period, a portion of time slots are available for discovery. Each UE can monitor these time slots to look for discoveries. However, even if the first UE and the second UE discover each other during a discovery time slot, the second UE may miss the communication if it is transmitted while the first UE is in the DRX-off period. Figure 8 The example explains two different DRX loops 800 for two different UEs. Figure 8 The explanation states that the portions of the DRX activation duration for two UEs can overlap in some DRX cycles but not in others. If the first UE (e.g., UE A) is performing DRX, the second UE (e.g., UE B) will not know when the first UE will be awake or asleep. UE A may receive a discovery message 802 from UE B during the first DRX cycle. If UE A sends a reply 804 to UE B at the beginning of UE A's DRX activation duration during the second DRX cycle, UE B will miss the reply because it arrives before UE B's DRX activation duration.

[0102] The aspects presented herein facilitate the implementation of DRX for sidelink communication by providing DRX information to be exchanged between UEs and coordinating sidelink communication based on DRX messages from one or more UEs. One or more UEs (such as UE 402, 404, or 406) may include a sidelink DRX component 198 configured to provide information about DRX modes for sidelink communication to other devices, or to receive DRX information for sidelink communication from such other devices. The sidelink DRX component 198 may monitor or transmit sidelink communication based on DRX mode information. Although examples are described with reference to UEs herein, these aspects can be applied by any device communicating based on sidelink.

[0103] During the discovery procedure, UE A and / or UE B may convey information about their respective DRX modes as part of the discovery message. The discovery message can refer to the message exchanged during the procedure in which UE A and UE B find each other and establish a link between UE A and UE B for sidelink communication.

[0104] In the example of the Model A discovery procedure, the declaring UE can broadcast or announce its presence, and may include DRX information with the announcement message. For example, in Figure 11A In the first example 1100, UE 1104 may transmit a declaration message 1103 containing DRX information. Therefore, the declaring UE may broadcast DRX information about the DRX mode used by the declaring UE. The monitoring UE may scan for declaration messages from another UE. At 1105, the monitoring UE (e.g., UE 1102) may receive the declaration message 1103 from the declaring UE and may determine the DRX information about the declaring UE from the declaration message.

[0105] In some examples, the monitoring UE can use DRX information to communicate with the announcing UE, for example by transmitting a response to the announcement message during the DRX enable period of the announcing UE. Figure 11A The explanation states that UEs 1102 and 1104 exchange sidelink communication 1111 based at least on UE 1104's DRX mode.

[0106] In some examples, the monitoring UE may follow the same DRX mode as the declaring UE. In other examples, the monitoring UE may select a different DRX mode, or may use different DRX modes. For example, in response 1107, the monitoring UE may respond to the declaration message by providing the declaring UE with DRX information about different DRX modes. The declaring UE and the monitoring UE may then exchange sidelink communication 1111 by transmitting and receiving communication within a common portion between the DRX activation durations of the two DRX modes. For example, UEs 1102 and 1104 may both use the respective UE's DRX information along with DRX messages received from the other UE to determine the overlap between DRX modes, for example, as explained in 1109. Figure 9 The first DRX mode 900 and the second DRX mode 950 have been explained. A UE can use the overlap 925 between the DRX activation duration of the first DRX mode 900 and the DRX activation duration of the second DRX mode 950 to transmit sidelink communication to another UE. The declaring UE and the monitoring UE can avoid using resources whose respective DRX activation durations fall outside the DRX activation duration of another UE to transmit sidelink communication to that other UE.

[0107] Figure 11BExample 1150 of the Model B discovery procedure explains that the discoverer (e.g., UE 1102) may send a connection request 1113, and the discoverer (e.g., UE 1104) may send a response 1115 along with its DRX information. At 1117, the discoverer may use the DRX information to determine its DRX mode. In some examples, the discoverer UE may follow the same DRX mode as the discoverer UE. In other examples, the discoverer UE may select a different DRX mode, or may use a different DRX mode. As explained at 1119, the discoverer UE may respond to the response by providing the discoverer UE with DRX information about the different DRX mode. Subsequently, the discoverer UE and the discoverer UE may exchange sidelink communication by transmitting and receiving communication within a common portion between the DRX activation durations of the two DRX modes determined at 1121, for example, as determined at 1120. Figure 9 The first DRX mode 900 and the second DRX mode 950 have been explained. A UE can use the overlap 925 between the DRX enable duration of the first DRX mode 900 and the DRX enable duration of the second DRX mode 950 to transmit sidelink communication to another UE. The discovered UE and the discovering UE can avoid using resources whose respective DRX enable durations fall outside the DRX enable duration of another UE to transmit sidelink communication to that other UE.

[0108] Such as combination Figure 6 and Figure 7 As described, a UE using distributed resource allocation for sidelink communication can perform partial sensing and can select resources for sidelink transmissions based on this partial sensing. If a sidelink UE performs partial sensing using both sensing and non-sensing periods, such as sensing during the DRX enable duration but not during the DRX disable duration, the UE will not have reserved sensing information about transmissions outside the DRX enable duration and may be unable to use resources for sidelink communication. In some examples, a sidelink UE may not extend the DRX enable duration for a longer period of time for sidelink activity. For example, based on receiving negative feedback or not receiving positive feedback for an initial sidelink transmission transmitted during the DRX enable duration, the UE may not extend the DRX enable duration to perform HARQ retransmission. Figure 10 The example DRX mode 1000 for a sidelink UE is explained. Although a UE receiving communication during the DRX enable duration configured by the base station for the access link can extend the DRX enable duration as shown for DRX enable extension, the UE can suppress the extension of the sidelink DRX enable duration. For example, the UE can suppress the use of the extended DRX enable duration for sidelink activities (such as sidelink transmission, retransmission, sidelink reception, sidelink sensing, etc.). Figure 16The explanation illustrates an example of how a UE can select and retain resources during the DRX enable period. Figure 16 Example 1600 illustrates DRX mode and resource reservations 1602 and 1604. Resource reservation 1602 is transmitted during a first DRX activation period and is for resources in another DRX activation period. Resource reservation 1604 is transmitted during a DRX activation period and is reserved for resources within the same DRX activation period. The radio device can suppress reserved resources outside of the DRX activation period, as explained at 1606. If the receiving UE is also performing DRX, the selected / reserved resources can be resources that are also within the receiving UE's DRX activation period. Figure 16 Example 1650 explains that a UE can transmit a resource reservation 1608 or 1614 that overlaps with the DRX enable duration of a receiving UE. A UE can suppress the reservation of resources (e.g., 1610 and 1612) that are not within the DRX enable duration of a UE (e.g., UE A) or a receiving UE (e.g., UE B) that is not reserving the resource. This reservation can occur within the same DRX enable duration, such as for 1608, or across different DRX enable durations, such as for 1614.

[0109] For example, once DRX mode is configured for the UE, determined by the UE, or applied by the UE for the sidelink, the UE can restrict its sidelink activity to the configured / established DRX enable duration and suppress extended DRX enable duration. For example, the UE can suppress extended DRX enable duration based on an inactive timer and can suppress the use of extension for HARQ transmissions and / or retransmissions. For example, if a sidelink retransmission is required at the end of the DRX enable duration, the UE can postpone the sidelink retransmission to the next DRX enable time.

[0110] Because the UE may not have sensing information for the duration of DRX shutdown, the UE can restrict sidelink activity to the duration of DRX activation.

[0111] In some examples, a sidelink UE can restrict its sidelink activity to the DRX-enabled duration based on the type of resource allocation used by the UE. For example, if the UE uses a distributed resource allocation for sidelink communication (where the UE autonomously selects resources for sidelink transmission using sensing) (e.g., mode 2 resource allocation), the UE can restrict its sidelink activity to the DRX-enabled duration. If the UE uses a centralized resource allocation type (where the UE receives resource allocation from the base station) (e.g., mode 1 resource allocation), the UE can perform sidelink activity for an extended DRX-enabled duration, similar to DRX operation for a Uu link. For example, the UE can extend the DRX-enabled duration based on a DRX inactivity timer.

[0112] In some examples, the UE can be configured to have both a sidelink and an access link (e.g., a Uu link). The UE can use DRX for both sidelink communication and communication with the base station on the access link. In some examples, the UE can configure a single DRX for both the sidelink and the access link. In other examples, the UE can use a different DRX mode for the sidelink than the DRX configuration used for the base station. DRX can be configured separately for the sidelink and the Uu link.

[0113] If the UE uses a single DRX configuration or a single DRX mode for both sidelink and Uu link, the DRX enable duration can be extended, for example, in response to data received on the Uu link. The UE can continue to restrict sidelink activity to the unextended DRX enable duration, for example, the duration dedicated to sidelink communication. The UE can extend its Uu communication activity with the base station (whether downlink reception or uplink transmission) to the extended DRX enable period, but can restrict sidelink activity to the unextended DRX enable duration.

[0114] If the UE uses different DRX configurations for the side link and the Uu link, the UE can handle the extension of the DRX activation duration for the Uu link separately from the DRX activation duration for the side link.

[0115] In some examples, the UE can operate using DRX for sidelink communication based on the resource allocation type used for sidelink communication. If the UE uses a centralized resource allocation type (where the UE receives resource allocation from the base station) (e.g., mode 1 resource allocation), the UE can use DRX for sidelink communication by using both DRX on and DRX off durations. If the UE uses a distributed resource allocation for sidelink communication (where the UE autonomously selects resources for sidelink transmission using sensing) (e.g., mode 2 resource allocation), the UE may not apply DRX for sidelink communication. Instead, the UE can perform partial or full sensing on the resource pool used for sidelink communication. The UE can be configured or pre-configured to perform partial or full sensing on the resource pool. If the UE is configured to perform full sensing, the UE will not use sleep mode and will not perform DRX. If the UE is configured to perform partial sensing according to the configured on / off mode, partial sensing can provide power savings for the UE.

[0116] Figure 12A This is a flowchart 1200 of a wireless communication method. The method can be performed by a first wireless device (e.g., UE 104, 402, 404, 406, 408, 1104, device 310 or 350, RSU 407; equipment 1402) that communicates based on a sidelink. One method may include combining... Figure 12AAny combination or sub-combination of the described aspects. This method enables wireless devices to achieve power savings through DRX associated with sidelink communication.

[0117] At 1204, the first wireless device transmits a sidelink discovery message including information about the first wireless device's first DRX mode. The sidelink discovery message may include a sidelink announcement message, and the first wireless device may broadcast a sidelink announcement including information about the first wireless device's first DRX mode, for example, as combined with... Figure 11A As described in Example 1100. For example, the reception can be provided by... Figure 14 The transmission component 1434 or discovery component 1440 of the equipment 1402 in the middle is executed.

[0118] At point 1206, the first wireless device monitors sidelink communication based on this first DRX mode. For example, this monitoring could be performed by... Figure 14 The DRX component 1442 or receiver component 1430 of the equipment 1402 in the middle is executed.

[0119] Figure 12B Additional aspects have been explained, one or more of which can be related to Figure 12A The flowcharts 1250, 1204 and 1206, are executed in combination. One method may include combining... Figure 12B Any combination or sub-combination of the aspects described.

[0120] In some examples, the first wireless device may receive a sidelink connection request from the second wireless device, as explained at 1202, and the first wireless device transmits a sidelink discovery message at 1204 as a response to the sidelink connection request. For example, this reception may be by... Figure 14 The receiving component 1430 or the discovery component 1440 of the equipment 1402 in the middle performs the operation.

[0121] As explained in 1208, the first wireless device can receive a response to the discovery message from the second wireless device, the response including DRX information about the second wireless device's second DRX mode. This response can be a response to an announcement message, such as in conjunction with... Figure 11A As described in 1107. This response (e.g., 1119) can be in response to a reply (e.g., 1115) from the first wireless device to a discovery request (e.g., 1113) from the second wireless device, such as in combination with... Figure 11B As described. For example, the reception can be provided by... Figure 14 The receiving component 1430 or the discovery component 1440 of the equipment 1402 in the middle performs the operation.

[0122] At point 1210, the first wireless device exchanges sidelink communication with the second wireless device based at least on a first DRX mode. The first wireless device can communicate with the second wireless device on the sidelink based on resources shared by the first and second DRX modes, such as combining... Figure 9 , Figure 11A Or as described in 11B. This communication may, for example, be provided by Figure 14 The receiving component 1430, the transmitting component 1434, and / or the communication component 1432 of the equipment 1402 are used to perform this function.

[0123] As explained in 1212, the UE may perform sidelink activities during the DRX enable duration of the first DRX mode. This sidelink activity may be performed, for example, by the transmit component 1434 or the receive component 1430 in conjunction with the DRX component 1442. The sidelink activities performed by the first radio device during the DRX enable duration may include one or more of sidelink transmission, sidelink reception, or sidelink sensing, wherein the first radio device skips performing sidelink activities during the DRX disable duration of the first DRX mode, such as in conjunction with... Figure 15 or Figure 17 The flowchart described in the document.

[0124] Figure 15 This is a flowchart 1500 of a wireless communication method. The method can be performed by a first wireless device (e.g., UE 104, 402, 404, 406, 408, 1104, device 310 or 350, RSU 407; equipment 1402) that communicates based on a side link.

[0125] At point 1502, the wireless device determines the DRX mode used for sidelink communication. The DRX mode includes a DRX enable duration and a DRX disable duration, as combined with... Figure 5 , 8 Or as described by any of the 10. The determination of the DRX mode can, for example, be made by Figure 14 The DRX component 1442 of the equipment 1402 is executed.

[0126] At 1504, the UE performs sidelink activity during the DRX activation duration of the first DRX mode. This sidelink activity may be performed, for example, by the transmit component 1434 or the receive component 1430 in conjunction with the DRX component 1442. The sidelink activity performed by the first radio device during the DRX activation duration may include one or more of the following: sidelink transmission at 1510, sidelink reception at 1514, or sidelink sensing at 1506.

[0127] The sidelink activity performed by the first wireless device at 1504 during the DRX enable period may include determining, at 1508, resources for a sidelink transmission to the second wireless device (within the DRX enable portion). The determined resources may be within the DRX enable portion of the DRX. Resources reserved in the message may be within the same DRX enable period in which the first wireless device transmits the message, as explained in 1604. Resources reserved in the message may be within the next DRX enable period, as explained in 1602. Figure 16 Example 1600 illustrates DRX mode and resource reservations 1602 and 1604. Resource reservation 1602 is transmitted during a first DRX enable duration and for resources in another DRX enable duration, while resource reservation 1604 is transmitted during a DRX enable duration and for resources within the same DRX enable duration. The wireless device can suppress sidelink resource reservations for transmitting reserved resources outside of the DRX enable duration, as explained at 1606. The wireless device can select or reserve a resource based on the resource during the first DRX enable duration of the first wireless device and the second DRX enable duration of the second wireless device, such as in combination. Figure 16 Example 1650 is described in the text.

[0128] Subsequently, the wireless device may transmit a message to the second wireless device during the DRX activation period reserving resources for the DRX activation period, as explained in 1512. The wireless device may suppress the reservation of resources outside the DRX activation period. The wireless device may suppress the transmission of messages reserving resources outside the DRX activation period, for example, as explained in 1516.

[0129] The first wireless device may skip performing sidelink activities during the DRX shutdown duration of the first DRX mode, as explained in 1516.

[0130] The first wireless device can perform sidelink activities during the DRX enable period without extending the DRX enable period, such as in combination with Figure 10 As described, the first wireless device can perform sidelink activities within the DRX activation period without extending the DRX activation duration, based on the resource allocation type used for sidelink communication. If the first wireless device operates based on a mode 2 sidelink resource allocation, the first wireless device can perform sidelink activities within the DRX activation period without extending the DRX activation duration; and if the first wireless device operates based on a mode 1 sidelink resource allocation from the base station, the first wireless device can extend the DRX activation duration based on a DRX inactivity timer.

[0131] In some examples, if a retransmission would extend beyond the DRX enable duration, the UE can postpone the retransmission to the next DRX enable duration. The first radio device can receive DRX configuration for the access link from the base station, wherein the first DRX mode for the sidelink is the same as the second DRX mode for the access link; and can extend the DRX enable duration for the access link and use the non-extended DRX enable duration for the sidelink.

[0132] The first wireless device can receive DRX configuration for the access link from the base station, wherein the first DRX mode for the side link is different from the second DRX mode for the access link; and the enable duration of the second DRX mode for the access link can be extended, and the non-extended DRX enable duration can be used for the side link.

[0133] In some examples, the first wireless device may apply DRX configuration based on its resource allocation mode. For example, the first wireless device may apply DRX configuration for mode 1 resource allocation from a base station to sidelink communication. Alternatively, the first wireless device may not apply DRX configuration to a fully sensing mode or a partially sensing mode.

[0134] Figure 13A A flowchart 1300 illustrates a method for wireless communication between a second wireless device and a first wireless device. This method can be performed by a second wireless device (e.g., UE 104, 402, 404, 406, 408, 1102, device 310 or 350, RSU 407; equipment 1402) that communicates via a sidelink.

[0135] At 1304, the second wireless device receives from the first wireless device a sidelink discovery message including information about the first wireless device's first discontinuous reception (DRX) mode. In some aspects, the first wireless device may correspond to a combination of Figure 12A Or the first wireless device described in 12B. Figure 8 and Figure 9 An example of DRX mode for sidelinks has been explained. Sidelink discovery messages may include broadcast sidelink announcement messages, such as those combined with... Figure 11A As described in Example 1100. For example, the reception can be provided by... Figure 14 The receiving component 1434 or the discovery component 1430 of the equipment 1402 in the middle performs the operation.

[0136] At point 1308, the second wireless device exchanges sidelink communication with the first wireless device based on the first DRX mode. The second wireless device can communicate with the first wireless device on the sidelink using resources shared by the first and second DRX modes, such as combining... Figure 9 or Figure 11A As described. This communication can, for example, be provided by... Figure 14 The receiving component 1430, the transmitting component 1434, and / or the communication component 1432 of the equipment 1402 are used to perform this function.

[0137] Figure 13B Additional aspects have been explained, one or more of which can be related to Figure 13B The 1304 and 1308 in the code are executed in combination. One method may include combining... Figure 13B Any combination or sub-combination of the aspects described in flowchart 1350. In some examples, the second wireless device may transmit a sidelink connection request to the first wireless device, such as as explained in 1302, where the second wireless device receives a sidelink discovery message at 1304 as a response to the sidelink connection request. For example, this transmission may be by Figure 14 The transmission component 1434 or discovery component 1440 of the equipment 1402 in the middle is executed.

[0138] As explained in 1306, the second wireless device can transmit a response to a message from the first wireless device, the response including DRX information regarding the second wireless device's second DRX mode. This response can be a reply to an announcement message, such as one combined with... Figure 11A As described in 1107. This response (e.g., 1119) can be in response to a reply (e.g., 1115) from the first wireless device to a discovery request (e.g., 1113) from the second wireless device, such as in combination with... Figure 11B As described. For example, this transmission can be made by... Figure 14 The transmission component 1434 or DRX component 1442 of the equipment 1402 in the middle is executed.

[0139] Figure 14Figure 1400 illustrates an example of the hardware implementation of device 1402. Device 1402 may be a UE, a component of a UE, or implement UE functionality. In some aspects, device 1402 may include a baseband processor 1404 (also referred to as a modem) coupled to an RF transceiver 1422. Device 1402 may further include one or more Subscriber Identity Module (SIM) cards 1420, an application processor 1406 coupled to a Secure Digital Card (SD) card 1408 and a screen 1410, a Bluetooth module 1412, a Wireless Local Area Network (WLAN) module 1414, a Global Positioning System (GPS) module 1416, and / or a power supply 1418. Baseband processor 1404 communicates with UE 104 and / or base station 102 / 180 via RF transceiver 1422. Baseband processor 1404 may include computer-readable media / memory. The computer-readable media / memory may be non-transient. The baseband processor 1404 is responsible for general processing, including the execution of software stored on a computer-readable medium / memory. When executed by the baseband processor 1404, the software causes the baseband processor 1404 to perform the various functions described above. The computer-readable medium / memory can also be used to store data manipulated by the baseband processor 1404 during software execution. The baseband processor 1404 further includes a receiving component 1430, a communication manager 1432, and a transmitting component 1434. The communication manager 1432 includes the one or more of the described components. The components within the communication manager 1432 can be stored in the computer-readable medium / memory and / or configured as hardware within the baseband processor 1404. The baseband processor 1404 may be a component of device 350 and may include memory 360 and / or at least one of the following: a TX processor 368, an RX processor 356, and a controller / processor 359. In one configuration, device 1402 may be a modem chip and include only baseband processor 1404, while in another configuration, device 1402 may be the entire UE (e.g., see...). Figure 3 (350) and includes an additional module equipped with 1402.

[0140] Communication manager 1432 includes discovery component 1440, which is configured to perform discovery, for example, as in combination with Figure 11A-13B As described in any of 17 or 18, and DRX component 1442, which is configured to perform DRX for sidelinks, for example, as in combination Figure 11A-13B As described by any one of 17, 18A or 18B.

[0141] The equipment may include execution Figure 11A-13B Additional components for each block of the algorithm in flowcharts 17, 18A, or 18B. Thus, Figure 11A-13BEach block in flowcharts 17, 18A, or 18B may be executed by a component, and the apparatus may include one or more of those components. These components may be one or more hardware components specifically configured to execute the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0142] As shown in the figure, equipment 1402 may include various components configured for various functions. In one configuration, equipment 1402, and in particular baseband processor 1404, may include: means for transmitting a sidelink discovery message including information about a first DRX mode of a first wireless device; and means for monitoring sidelink communication based on the first DRX mode (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, discovery component 1440, DRX component 1442, and / or RF transceiver 1422). Equipment 1402 may further include means for receiving a response to a sidelink announcement message from a second wireless device (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, discovery component 1440, DRX component 1442, and / or RF transceiver 1422), the response including DRX information about a second DRX mode of the second wireless device. The apparatus 1402 may further include means for communicating with a second wireless device on a sidelink based on resources shared by the first DRX mode and the second DRX mode (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, DRX component 1442, and / or RF transceiver 1422). The apparatus 1402 may further include means for receiving a sidelink connection request from the second wireless device (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, discovery component 1440, and / or RF transceiver 1422), wherein the first wireless device transmits a sidelink discovery message as a response to the sidelink connection request from the second wireless device. The apparatus 1402 may further include means (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, discovery component 1440, DRX component 1442, and / or RF transceiver 1422) for receiving a response to a sidelink discovery message from the second wireless device, the response including DRX information about a second DRX mode of the second wireless device. The apparatus 1402 may further include means (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, DRX component 1442, and / or RF transceiver 1422) for communicating with the second wireless device on a sidelink based on resources shared by the first and second DRX modes. The apparatus 1402 may further include means (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, DRX component 1442, and / or RF transceiver 1422) for performing sidelink activities during the DRX activation duration of the first DRX mode. The equipment 1402 may further include means for postponing the retransmission to the next DRX activation period if the retransmission would extend beyond the DRX activation period (e.g., transmission component 1434, communication manager 1432, or DRX component 1442).The apparatus 1402 may further include means for receiving DRX configuration for an access link from a base station, wherein a first DRX mode for a side link is the same as a second DRX mode for an access link; and means for extending the DRX enable duration for the access link and applying a non-extended DRX enable duration to the side link (e.g., receiving component 1430 or DRX component 1442). The apparatus 1402 may further include means for receiving DRX configuration for an access link from a base station, wherein a first DRX mode for a side link is different from a second DRX mode for an access link; and means for extending the enable duration of the second DRX mode for the access link (e.g., receiving component 1430 or DRX component 1442). The apparatus 1402 may include means (e.g., transmission component 1434, communication manager 1432, discovery component 1440, DRX component 1442, and / or RF transceiver 1422) for receiving a sidelink discovery message from a second wireless device, including information about a first DRX mode of the second wireless device; and means (e.g., receiving component 1430, transmission component 1434, communication manager 1432, DRX component 1442, and / or RF transceiver 1422) for exchanging sidelink communication with the second wireless device based on the first DRX mode. The apparatus 1402 may further include means (e.g., transmission component 1434, communication manager 1432, discovery component 1440, DRX component 1442, and / or RF transceiver 1422) for transmitting a response to a sidelink announcement message from the second wireless device, the response including DRX information about the second DRX mode of the first wireless device. The apparatus 1402 may further include means for communicating with a second wireless device on a sidelink based on resources shared by the first DRX mode and the second DRX mode (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, DRX component 1442, and / or RF transceiver 1422). The apparatus 1402 may further include means for transmitting a sidelink connection request to the second wireless device (e.g., transmitting component 1434, communication manager 1432, discovery component 1440, and / or RF transceiver 1422), wherein the first wireless device receives a sidelink discovery message as a response to the sidelink connection request. The apparatus 1402 may further include means for transmitting a reply to the sidelink discovery message (e.g., transmitting component 1434, communication manager 1432, discovery component 1440, and / or RF transceiver 1422), the reply including DRX information regarding the second DRX mode of the first wireless device. The device 1402 may further include means for communicating with a second wireless device on a side link based on resources shared by the first DRX mode and the second DRX mode (e.g., receiving component 1430, transmitting component 1434, communication manager 1432, DRX component 1442 and / or RF transceiver 1422).Equipment 1402 may include means for determining a DRX mode for sidelink communication (e.g., DRX component 1442) and means for performing sidelink activities during the DRX activation period of the DRX mode (e.g., receiving component 1430, transmitting component 1434, and / or DRX component 1432). Equipment 1402 may include means for determining resources for sidelink communication during the DRX activation period of the DRX mode, and means for communicating on those resources during the DRX activation period of the DRX mode. Equipment 1402 may include means for receiving resource allocations for sidelink communication based on mode 1 resource allocation from a base station (e.g., receiving component 1430 and / or RF transceiver 1422), and means for transmitting or receiving sidelink communication based on DRX configuration (e.g., receiving component 1430, transmitting component 1434, and / or DRX component 1442). Equipment 1402 may include means for applying DRX configuration to sidelink communication based on the resource allocation mode of the first wireless device. Each device may be one or more of the components in equipment 1402 configured to perform the functions described by the devices. As described above, equipment 1402 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, each device may be a TX processor 368, an RX processor 356, and a controller / processor 359 configured to perform the functions described by each device.

[0143] Figure 17 This is a flowchart 1700 of a wireless communication method. The method can be performed by a first wireless device (e.g., UE 104, 402, 404, 406, 408, 1104, device 310 or 350, RSU 407; equipment 1402) that communicates based on a sidelink. One method may include combining... Figure 17 Any combination or sub-combination of the described aspects. This method enables wireless devices to achieve power savings through DRX associated with sidelink communication.

[0144] At 1702, the wireless device determines the resources used for sidelink communication during the DRX enable duration of the DRX mode. The DRX mode includes a DRX enable duration and a DRX disable duration, as combined with... Figure 5 , 8 Or as described by any of the 10. The determination of the DRX mode can, for example, be made by Figure 14 The DRX component 1442 of the equipment 1402 is executed.

[0145] At 1704, the UE communicates on this resource during the DRX enable duration of the first DRX mode. This communication may be performed, for example, by a transmission component 1434 or a reception component 1430 in conjunction with a DRX component 1442. In some aspects, the communication may include transmission and / or reception. Sidelink activities performed by the first radio device during the DRX enable duration may include one or more of the following: sidelink transmission at 1510, sidelink reception at 1514, or sidelink sensing at 1506.

[0146] This communication includes performing one or more of the following during the DRX enable duration: sidelink transmission, sidelink reception, or sidelink sensing, and skipping one or more of these actions during the DRX disable duration in DRX mode. For example, as explained at 1706, the UE may perform sidelink reception during the DRX enable duration and skip sidelink reception during the DRX disable duration. As another example, as explained at 1708, the UE may perform sidelink sensing during the DRX enable duration and skip sidelink sensing during the DRX disable duration. As yet another example, as explained at 1710, the UE may transmit a message to a second radio device during the DRX enable duration reserving resources that occur during the DRX enable duration and suppress the reserved resources outside the DRX enable duration.

[0147] The UE may transmit messages during the same DRX enable duration in which resources are reserved, as explained in 1604. The UE may also transmit messages during a DRX enable duration earlier than the DRX enable duration in which resources are reserved, as explained in 1602. Figure 16 Example 1600 illustrates DRX mode and resource reservations 1602 and 1604. Resource reservation 1602 is transmitted during a first DRX enable duration and for resources in another DRX enable duration, while resource reservation 1604 is transmitted during a DRX enable duration and for resources within the same DRX enable duration. The wireless device can suppress sidelink resource reservations for transmitting reserved resources outside of the DRX enable duration, as explained at 1606. The wireless device can select or reserve a resource based on the resource during the first DRX enable duration of the first wireless device and the second DRX enable duration of the second wireless device, such as in combination. Figure 16 Example 1650 is described in the text.

[0148] The first wireless device can skip performing sidelink activities during the DRX shutdown duration of the first DRX mode.

[0149] The first wireless device can perform sidelink activities during the DRX enable period without extending the DRX enable period, such as in combination with Figure 10As described, the first wireless device can perform sidelink activities within the DRX activation period without extending the DRX activation duration, based on the resource allocation type used for sidelink communication. If the first wireless device operates based on a mode 2 sidelink resource allocation, the first wireless device can perform sidelink activities within the DRX activation period without extending the DRX activation duration; and if the first wireless device operates based on a mode 1 sidelink resource allocation from the base station, the first wireless device can extend the DRX activation duration based on a DRX inactivity timer.

[0150] In some examples, if a retransmission would extend beyond the DRX enable duration, the UE can postpone the retransmission to the next DRX enable duration. The first radio device can receive DRX configuration for the access link from the base station, wherein the first DRX mode for the sidelink is the same as the second DRX mode for the access link; and can extend the DRX enable duration for the access link and use the non-extended DRX enable duration for the sidelink.

[0151] The first wireless device can receive DRX configuration for the access link from the base station, wherein the first DRX mode for the side link is different from the second DRX mode for the access link; and the activation duration of the second DRX mode for the access link can be extended.

[0152] In some examples, the first wireless device may apply DRX configuration based on its resource allocation mode. For example, the first wireless device may apply DRX configuration for mode 1 resource allocation from a base station to sidelink communication. Alternatively, the first wireless device may not apply DRX configuration to a fully sensing mode or a partially sensing mode.

[0153] Figure 18A This is a flowchart 1800 of a wireless communication method. The method can be performed by a first wireless device communicating via a sidelink (e.g., UE 104, 402, 404, 406, 408, 1104, device 310 or 350, RSU 407; equipment 1402). A method may include any combination or sub-combination of the aspects described in FIG18. This method enables the wireless device to achieve power savings through DRX associated with sidelink communication.

[0154] At 1802, the device receives from the base station a resource allocation for sidelink communication based on Mode 1 resource allocation. This reception can be, for example, by... Figure 14 The receiving component 1430 of the equipment 1402 performs this function. Therefore, the device can operate based on mode 1 resource allocation, for example, transmitting side-link communication.

[0155] At 1804, the device transmits or receives sidelink communication based on Mode 1 resource allocation and during the DRX activation period configured in the DRX. Mode 1 resource allocation may include centralized resource allocation. For example, the device may operate in the DRX based on Mode 1 resource allocation and may skip DRX operation, while if the device operates based on Mode 2 resource allocation, it may continuously monitor communication. Mode 2 resource allocation may be a distributed mode, where each UE selects its own resources for sidelink transmission. The transmission or reception of sidelink communication may include any aspect described in conjunction with the flowcharts in Figures 12, 13, 15, and / or 17. This transmission or reception may be performed, for example, by transmission component 1434 or reception component 1430 in conjunction with DRX component 1442.

[0156] Figure 18B This is a flowchart 1850 of a wireless communication method. This method can be performed by a first wireless device communicating via a sidelink (e.g., UE 104, 402, 404, 406, 408, 1104, device 310 or 350, RSU 407; equipment 1402). In some examples, it can be combined with... Figure 18A The methods described in flowchart 1850 are used to execute aspects of the methods described therein. At 1801, the device applies DRX configuration to sidelink communication based on the resource allocation mode of the first wireless device. The application of the DRX configuration may be performed, for example, by DRX component 1442. For example, the device may determine whether to apply the DRX configuration based on the resource allocation type used by the device for sidelink communication. For example, the device may apply DRX configuration for mode 1 resource allocation from the base station to sidelink communication. The device may skip the application of the DRX configuration in response to operation in a fully sensing mode or a partially sensing mode of resource allocation.

[0157] At 1804, such as Figure 18A In this configuration, the device transmits or receives sidelink communication based on the DRX configuration. For example, the device may transmit or receive sidelink communication during the DRX activation period. The transmission or reception of sidelink communication may include any aspect described in conjunction with the flowcharts in Figures 12, 13, 15, and / or 17. This transmission or reception may be performed, for example, by the transmission component 1434 or the reception component 1430 in conjunction with the DRX component 1442.

[0158] It should be understood that the specific order or hierarchy of the boxes in the disclosed process / flowcharts is an explanation of exemplary methods. It should be understood that the specific order or hierarchy of the boxes in these process / flowcharts can be rearranged based on design preferences. Furthermore, some boxes may be combined or omitted. The appended method claims present the elements of the various boxes in an exemplary order and are not intended to be limited to the specific order or hierarchy presented.

[0159] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will readily be understood by those skilled in the art, and the universal principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are to be granted the full scope consistent with the language of the claims, wherein references to the singular form of an element, unless specifically stated otherwise, are not intended to mean “one and only one,” but rather “one or more.” Terms such as “if,” “when,” and “at the time of” should be interpreted as meaning “under this condition,” rather than implying a direct temporal relationship or reaction. That is, these phrases (e.g., “when”) do not imply an immediate action in response to the occurrence of an action or during the occurrence of an action, but only imply that an action will occur when a condition is met, without requiring a specific or immediate temporal constraint for the action to occur. The term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as superior to or overriding other aspects. Unless specifically stated otherwise, the term “some / a” refers to one or more. 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 multiple A, multiple B, or multiple C. Specifically, 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 only A, only B, only C, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members of A, B, or C. Elements of all aspects described throughout this disclosure that are structural and functional equivalents known now or hereafter to those skilled in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended as a donation to the public, whether or not such disclosure is expressly stated in the claims. The terms “module,” “mechanism,” “element,” and “device” are not necessarily substitutes for the term “apparatus.” Thus, no claim element should be interpreted as an apparatus plus a function unless the element is explicitly stated using the phrase “apparatus for…”.

[0160] The following examples are merely illustrative, and their aspects can be combined with other examples or aspects of the teachings described herein without limitation.

[0161] Aspect 1 is a method of wireless communication at a first wireless device, comprising: transmitting a sidelink discovery message including information about a first discontinuous reception (DRX) mode of the first wireless device; and monitoring sidelink communication based on the first DRX mode.

[0162] In aspect 2, the method of aspect 1 further includes that the sidelink discovery message includes a sidelink announcement message, and transmitting the sidelink discovery message includes broadcasting a sidelink announcement including information about a first DRX mode of the first wireless device.

[0163] In aspect 3, the method of aspect 1 or aspect 2 further includes receiving a response from the second wireless device to a peer link announcement message, the response including DRX information about the second wireless device's second DRX mode.

[0164] In aspect 4, the method of any of aspects 1-3 further includes communicating with a second wireless device on a side link based on resources shared by the first DRX mode and the second DRX mode.

[0165] In aspect 5, the method of any of aspects 1-4 further includes receiving a sidelink connection request from a second wireless device, wherein the first wireless device transmits a sidelink discovery message as a response to the sidelink connection request from the second wireless device.

[0166] In aspect 6, the method of any of aspects 1-5 further includes receiving a response from the second wireless device to a peer link discovery message, the response including DRX information about the second DRX mode of the second wireless device.

[0167] In aspect 7, the method of any of aspects 1-6 further includes communicating with a second wireless device on a side link based on resources shared by the first DRX mode and the second DRX mode.

[0168] Aspect 8 is a device comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the device to perform the methods of any of Aspects 1-7.

[0169] Aspect 9 is a system or apparatus that includes means for implementing the method or apparatus of any of aspects 1-7.

[0170] Aspect 10 is a non-transitory computer-readable medium storing instructions that can be executed by one or more processors to cause the one or more processors to implement the methods of any of Aspects 1-7.

[0171] Aspect 11 is a method for wireless communication at a first wireless device, comprising: determining a discontinuous reception (DRX) mode for sidelink communication; and performing sidelink activities during the DRX activation duration of the DRX mode.

[0172] In aspect 12, the method of aspect 11 further includes sidelink activities performed by the first wireless device during the DRX enable duration, including one or more of sidelink transmission, sidelink reception, or sidelink sensing, and wherein the first wireless device skips performing sidelink activities during the DRX disable duration of the first DRX mode.

[0173] In aspect 13, the method of aspect 11 or aspect 12 further includes sidelink activities performed by the first wireless device during the DRX enable duration and skipped during the DRX disable duration, including sidelink transmission, sidelink reception and sidelink sensing.

[0174] In aspect 14, the method of any of aspects 11-13 further includes sidelink activities performed by the first wireless device during the DRX enable period and skipped during the DRX disable period, including determining resources for sidelink transmissions to the second wireless device, which are within the DRX enable portion of the DRX.

[0175] In aspect 15, the method of any of aspects 11-14 further includes transmitting a message of reserved resources to a second wireless device during the DRX activation period; and suppressing the transmission of the message of reserved resources outside the DRX activation period.

[0176] In aspect 16, the method of any of aspects 11-15 further includes that the resources reserved in the message are available during the same DRX activation period in which the first wireless device transmits the message.

[0177] In aspect 17, the method of any of aspects 11-16 further includes that the resources reserved in the message are retained during the next DRX start-up period.

[0178] In aspect 18, the method of any of aspects 11-17 further includes the first wireless device reserving the resource based on a first DRX activation duration of the first wireless device and a second DRX activation duration of the second wireless device.

[0179] In aspect 19, the method of any of aspects 11-18 further includes the first wireless device performing sidelink activity during the DRX activation period without extending the DRX activation period.

[0180] In aspect 20, the method of any of aspects 11-19 further includes the first wireless device performing sidelink activities during the DRX activation period without extending the DRX activation period, based on the resource allocation type for sidelink communication.

[0181] In aspect 21, the method of any of aspects 11-20 further includes, if the first wireless device operates based on mode 2 sidelink resource allocation, the first wireless device performs sidelink activities during the DRX activation period without extending the DRX activation period.

[0182] In aspect 22, the method of any of aspects 11-20 further includes, if the first wireless device operates based on mode 1 side link resource allocation from the base station, the first wireless device extends the DRX enable duration based on a DRX inactive timer.

[0183] In aspect 23, the method of any of aspects 11-22 further includes postponing the retransmission to the next DRX activation duration if the retransmission would extend beyond the DRX activation duration.

[0184] In aspect 24, the method of any of aspects 11-23 further includes receiving DRX configuration for an access link from a base station, wherein a first DRX mode for a side link is the same as a second DRX mode for an access link; and extending the DRX enable duration for the access link and using the non-extended DRX enable duration for the side link.

[0185] In aspect 25, the method of any of aspects 11-23 further includes receiving DRX configuration for access link from a base station, wherein a first DRX mode for side link is different from a second DRX mode for access link; and extending the activation duration of the second DRX mode for access link.

[0186] In aspect 26, the method of any one of aspects 11-25 further includes the first wireless device applying DRX configuration based on the resource allocation mode of the first wireless device.

[0187] In aspect 27, the method of aspect 11 further includes: the first wireless device applying the DRX configuration used for mode 1 resource allocation from the base station to sidelink communication.

[0188] In aspect 28, the method of any of aspects 11-27 further includes the first wireless device not applying DRX configuration to full sensing mode or partial sensing mode.

[0189] Aspect 29 is an apparatus comprising one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the apparatus to perform the methods of any of aspects 9-28.

[0190] Aspect 30 is a system or apparatus that includes means for implementing the method or apparatus of any of aspects 9-28.

[0191] Aspect 31 is a non-transitory computer-readable medium storing instructions that can be executed by one or more processors to cause the one or more processors to implement the methods of any of aspects 9-28.

[0192] Aspect 32 is a method of wirelessly communicating with a first wireless device at a second wireless device, comprising: receiving from the first wireless device a sidelink discovery message including information about a first discontinuous reception (DRX) mode of the first wireless device; and exchanging sidelink communication with the first wireless device based on the first DRX mode.

[0193] In aspect 33, the method of aspect 32 further includes that the sidelink discovery message includes a broadcast sidelink announcement message.

[0194] In aspect 34, the method of aspect 32 or aspect 33 further includes transmitting a response to a broadcast sidelink announcement message from the first wireless device, the response including DRX information about a second DRX mode of the second wireless device.

[0195] In aspect 35, the method of any of aspects 32-34 further includes communicating with the first wireless device on a side link based on resources shared by the first DRX mode and the second DRX mode.

[0196] In aspect 36, the method of any of aspects 32-35 further includes transmitting a sidelink connection request to a first wireless device, wherein the second wireless device receives a sidelink discovery message as a response to the sidelink connection request.

[0197] In aspect 37, the method of any of aspects 32-33 further includes transmitting a reply of a peer link discovery message, the reply including DRX information about a second DRX mode of the second wireless device.

[0198] In aspect 38, the method of any of aspects 32-37 further includes communicating with the first wireless device on a side link based on resources shared by the first DRX mode and the second DRX mode.

[0199] Aspect 39 is an apparatus including one or more processors and one or more memories in electronic communication with the one or more processors, the one or more memories storing instructions executable by the one or more processors to cause the apparatus to perform the methods of any of aspects 32-38.

[0200] Aspect 40 is a system or apparatus that includes means for implementing the method or apparatus of any of aspects 32-38.

[0201] Aspect 41 is a non-transitory computer-readable medium storing instructions that can be executed by one or more processors to cause the one or more processors to implement the methods of any of aspects 32-38.

[0202] Aspect 42 is a method for wireless communication at a first wireless device, comprising: determining resources for sidelink communication during a DRX activation period of a DRX mode; and communicating on those resources during the DRX activation period of the DRX mode.

[0203] In aspect 43, the method of method 42 further includes performing one or more of sidelink transmission, sidelink reception, or sidelink sensing during the DRX enable duration, and skipping the performance of one or more of sidelink transmission, sidelink reception, or sidelink sensing during the DRX disable duration of the DRX mode.

[0204] In aspect 44, the method of aspect 43 further includes: executing a memory and at least one processor configured to perform sidelink reception during the DRX enable period and skip sidelink reception during the DRX disable period.

[0205] In aspect 45, the method of aspect 43 or 44 further includes performing sidelink sensing during the DRX enable duration and skipping sidelink sensing during the DRX disable duration.

[0206] In aspect 46, the method of any of aspects 43-45 further includes performing a message to a second wireless device during the DRX activation period to retain resources that appear during the DRX activation period; and suppressing the retention of resources outside the DRX activation period.

[0207] In aspect 47, the method of aspect 46 further includes: transmitting messages during the same DRX activation duration in which resources are reserved.

[0208] In aspect 48, the method of aspect 46 further includes: transmitting the message within a DRX duration earlier than the DRX start duration in which the resources are reserved.

[0209] In aspect 49, the method of any of aspects 46-48 further includes reserving the resource based on a first DRX activation duration of the first wireless device and a second DRX activation duration of the second wireless device.

[0210] In aspect 50, the method of any of aspects 42-49 further includes performing one or more of sidelink transmission, sidelink reception or sidelink sensing during the DRX enable time without extending the DRX enable time.

[0211] In aspect 51, the method of any of aspects 42-50 further includes performing one or more of sidelink transmission, sidelink reception or sidelink sensing during the DRX enable duration without extending the DRX enable duration, based on the resource allocation type used for sidelink communication.

[0212] In aspect 52, the method of aspect 51 further includes: the resource allocation type corresponds to the mode 2 side link resource allocation.

[0213] In aspect 53, the method of aspect 51 or 52 further includes extending the DRX enable duration based on a DRX inactive timer if the first wireless device operates based on a mode 1 side link resource allocation from a base station.

[0214] In aspect 54, the method of any of aspects 42-53 further includes postponing the retransmission to the next DRX activation duration if the retransmission would extend beyond the DRX activation duration.

[0215] In aspect 55, the method of any of aspects 42-54 further includes receiving DRX configuration for an access link from a base station, wherein a first DRX mode for a side link is the same as a second DRX mode for an access link; and extending the DRX enable duration for the access link and applying the non-extended DRX enable duration to the side link.

[0216] In aspect 56, the method of any of aspects 42-54 further includes receiving from a base station a DRX configuration for an access link, wherein a first DRX mode for a side link is different from a second DRX mode for an access link; and extending the activation duration of the second DRX mode for the access link.

[0217] Aspect 57 is an apparatus for wireless communication, including means for performing the methods of any of aspects 42-56.

[0218] In aspect 58, the equipment of aspect 57 further includes at least one antenna and a transceiver coupled to the at least one antenna.

[0219] Aspect 59 is an apparatus for wireless communication, including a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to perform the method of any of aspects 42-56.

[0220] In aspect 60, the apparatus of aspect 59 further includes at least one antenna and a transceiver coupled to the at least one antenna and at least one processor.

[0221] Aspect 61 is a non-transient computer-readable storage medium storing computer-executable code for wireless communication at a first wireless device, the code causing the processor, when executed by a processor, to perform a method as described in any of aspects 42-56.

[0222] Aspect 62 is a method for wireless communication at a wireless device, the method comprising: receiving from a base station a resource allocation for sidelink communication based on a mode 1 resource allocation; and transmitting or receiving sidelink communication based on the mode 1 resource allocation and during a DRX activation period configured by the DRX.

[0223] In aspect 63, the method of aspect 62 further includes: applying the DRX configuration used for mode 1 resource allocation from the base station to sidelink communication.

[0224] In aspect 64, the method of aspect 62 or 63 further includes: skipping the application of DRX configuration in response to operation in full sensing mode or partial sensing mode of resource allocation.

[0225] Aspect 65 is an apparatus for wireless communication, including means for performing the methods of any of aspects 62-64.

[0226] In aspect 66, the equipment of aspect 65 further includes at least one antenna and a transceiver coupled to the at least one antenna.

[0227] Aspect 67 is an apparatus for wireless communication, including a memory and at least one processor coupled to the memory, the memory and the at least one processor being configured to perform the method of any of Aspects 62-64.

[0228] In aspect 68, the apparatus of aspect 67 further includes at least one antenna and a transceiver coupled to the at least one antenna and at least one processor.

[0229] Aspect 69 is a non-transient computer-readable storage medium storing computer-executable code for wireless communication at a first wireless device, the code causing the processor, when executed by a processor, to perform a method as described in any of aspects 62-64.

Claims

1. An apparatus for performing wireless communication at a first wireless device, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, the one or more processors being configured to enable the first wireless device to: Determine the resources used for sidelink communication during the DRX activation period of the discontinuous reception DRX of the second wireless device; Send a message to the second wireless device to reserve the resource that appears only during the DRX activation period of the second wireless device; as well as During the DRX activation period of the DRX, a sidelink transmission is sent to the second wireless device on the resource.

2. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to perform both sidelink transmission and sidelink reception during the DRX activation duration.

3. The apparatus as described in claim 1, The one or more processors are configured to cause the first wireless device to perform sidelink reception during the DRX enable duration.

4. The apparatus of claim 1, wherein the one or more processors are configured to cause the first wireless device to perform a sidelink transmission during the DRX enable duration.

5. The apparatus of claim 1, wherein the one or more processors are configured to cause the first wireless device to send the message during the same DRX enable duration in which the resources are reserved for the sidelink transmission.

6. The apparatus of claim 1, wherein the one or more processors are configured to cause the first wireless device to send the message during a period of DRX activation compared to a previous DRX activation period during which the resources are reserved for the sidelink transmission.

7. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to: The resources are reserved based on the first DRX activation duration of the first wireless device and the second DRX activation duration of the second wireless device.

8. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to: One or more of the sidelink transmission, sidelink reception, or sidelink sensing are performed during the DRX activation period without extending the DRX activation period.

9. The apparatus of claim 8, wherein the one or more processors are further configured to cause the first wireless device to: Based on the resource allocation type used for the sidelink communication, one or more of the sidelink transmission, the sidelink reception, or the sidelink sensing are performed within the DRX activation period without extending the DRX activation period.

10. The apparatus of claim 9, wherein the resource allocation type corresponds to mode 2 sidelink resource allocation.

11. The apparatus of claim 10, wherein the one or more processors are further configured to cause the first wireless device to: If the first wireless device operates based on mode 1 side link resource allocation from the network node, the DRX activation duration is extended based on the DRX inactive timer.

12. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to: If a retransmission would extend the DRX enable duration beyond the specified duration, the retransmission will be postponed to the next DRX enable duration.

13. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to: Receive DRX configuration for the access link from the network node, wherein the first DRX mode for the side link is the same as the second DRX mode for the access link; Extend the DRX activation duration for the access link; and The non-extended DRX enable duration is used for the side link.

14. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to: Receive DRX configuration for the access link from the network node, wherein a first DRX mode for the side link is different from a second DRX mode for the access link; and Extend the activation duration of the second DRX mode for the access link.

15. The apparatus of claim 1, wherein the sidelink transmission to the second wireless device on the resource occurs during the DRX enable duration of the DRX cycle of the second wireless device.

16. The apparatus of claim 1, wherein the one or more processors are further configured to cause the first wireless device to: Sidelink sensing is performed during the DRX activation period; and The side link sensing is skipped during the DRX shutdown period.

17. The apparatus of claim 3, wherein the one or more processors are configured to cause the first wireless device to: Skip the side link reception during the DRX shutdown period.

18. The apparatus of claim 4, further comprising: At least one antenna; as well as A transceiver coupled to the at least one antenna and the one or more processors, wherein the one or more processors are configured to enable the first wireless device to: The side link transmission is skipped during the DRX shutdown period.

19. An apparatus for performing wireless communication at a first wireless device, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, the one or more processors being configured to enable the first wireless device to: Send a sidelink discovery message that includes information about the first discontinuous reception DRX of the first wireless device; Receive a message from the second wireless device containing a resource reservation for resources that only appear during the DRX enable period of the first wireless device; as well as During the DRX activation period of the first DRX, sidelink communication is received on the resource.

20. The apparatus of claim 19, further comprising: At least one antenna; as well as A transceiver coupled to the at least one antenna and the one or more processors. The sidelink discovery message includes a sidelink announcement message, and in order to send the sidelink announcement message, the one or more processors are further configured to cause the first wireless device to broadcast the sidelink announcement message including the information about the first DRX of the first wireless device.

21. The apparatus of claim 20, wherein the one or more processors are further configured to cause the first wireless device to: Receive a response to the sidelink announcement message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

22. The apparatus of claim 21, wherein the one or more processors are further configured to cause the first wireless device to: The second wireless device communicates on the side link using resources shared by the first and second DRXs.

23. The apparatus of claim 19, wherein the one or more processors are further configured to cause the first wireless device to: Receive a sidelink connection request from the second wireless device. The one or more processors are configured to cause the first wireless device to: Send the sidelink discovery message as a response to the sidelink connection request from the second wireless device.

24. The apparatus of claim 23, wherein the one or more processors are further configured to cause the first wireless device to: Receive a response to the sidelink discovery message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

25. The apparatus of claim 24, wherein the one or more processors are further configured to cause the first wireless device to: The second wireless device communicates on the side link using resources shared by the first and second DRXs.

26. The apparatus of claim 19, wherein the sidelink communication on the resource occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

27. An apparatus for wirelessly communicating with a first wireless device at a second wireless device, comprising: One or more memory units; as well as One or more processors coupled to the one or more memories, wherein the one or more processors are configured to enable the second wireless device to: Receive a sidelink discovery message from the first wireless device, including information about the first discontinuous reception DRX of the first wireless device; Send a message to the first wireless device to reserve resources that only appear during the DRX enable period of the first wireless device; as well as During the DRX activation period of the first DRX, a sidelink communication is sent to the first wireless device.

28. The apparatus of claim 27, wherein the sidelink discovery message includes a broadcast sidelink announcement message, and the one or more processors are further configured to cause the second wireless device to: Send a reply to the broadcast sidelink announcement message from the first wireless device, wherein the reply includes DRX information about the second DRX of the second wireless device.

29. The apparatus of claim 28, further comprising: At least one antenna; as well as A transceiver coupled to the at least one antenna and the one or more processors, wherein the one or more processors are further configured to enable the second wireless device to: The first wireless device communicates on the side link using resources shared by the first DRX and the second DRX.

30. The apparatus of claim 27, wherein the one or more processors are further configured to cause the second wireless device to: Send a sidelink connection request to the first wireless device, and then receive the sidelink discovery message as a response to the sidelink connection request; and Send a response to the sidelink discovery message, wherein the response includes DRX information about the second DRX of the second wireless device.

31. The apparatus of claim 30, wherein the one or more processors are further configured to cause the second wireless device to: The first wireless device communicates on the side link using resources shared by the first DRX and the second DRX.

32. The apparatus of claim 27, wherein the sidelink communication occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

33. A method for performing wireless communication at a first wireless device, comprising: Determine the resources used for sidelink communication during the DRX activation period of the discontinuous reception DRX of the second wireless device; Send a message to the second wireless device, the message reserving the resource that only occurs during the DRX activation period of the second wireless device; as well as During the DRX activation period of the DRX, a sidelink transmission is sent to the second wireless device on the resource.

34. The method of claim 33, wherein the method further comprises: Both sidelink transmission and sidelink reception are performed during the DRX activation period.

35. The method of claim 33, wherein the method further comprises: Sidelink reception is performed during the DRX activation period.

36. The method of claim 33, wherein the method further comprises: Sidelink transmissions are performed during the DRX activation period.

37. The method of claim 33, wherein sending the message comprises: The message is sent during the same DRX enable duration that reserves the resources for the side link transmission.

38. The method of claim 33, wherein sending the message comprises: The message is sent within the same DRX enable duration as the previous DRX enable duration during which the resources are reserved for the side link transmission.

39. The method of claim 33, further comprising: The resources are reserved based on the first DRX activation duration of the first wireless device and the second DRX activation duration of the second wireless device.

40. The method of claim 33, further comprising: One or more of the sidelink transmission, sidelink reception, or sidelink sensing are performed during the DRX activation period without extending the DRX activation period.

41. The method of claim 40, further comprising: Based on the resource allocation type used for the sidelink communication, one or more of the sidelink transmission, the sidelink reception, or the sidelink sensing are performed within the DRX activation period without extending the DRX activation period.

42. The method of claim 41, wherein the resource allocation type corresponds to mode 2 side link resource allocation.

43. The method of claim 42, further comprising: If the first wireless device operates based on mode 1 side link resource allocation from the network node, the DRX activation duration is extended based on the DRX inactive timer.

44. The method of claim 33, further comprising: If a retransmission would extend the DRX enable duration beyond the specified duration, the retransmission will be postponed to the next DRX enable duration.

45. The method of claim 33, further comprising: Receive DRX configuration for the access link from the network node, wherein the first DRX mode for the side link is the same as the second DRX mode for the access link; Extend the DRX activation duration for the access link; as well as The non-extended DRX enable duration is used for the side link.

46. ​​The method of claim 33, further comprising: Receive DRX configuration for the access link from the network node, wherein the first DRX mode for the side link is different from the second DRX mode for the access link; as well as Extend the activation duration of the second DRX mode for the access link.

47. The method of claim 33, wherein the sidelink transmission to the second wireless device on the resource occurs during the DRX enable duration of the DRX cycle of the second wireless device.

48. The method of claim 33, further comprising: Sidelink sensing is performed during the DRX activation period; and The side link sensing is skipped during the DRX shutdown period.

49. The method of claim 35, further comprising: Skip the side link reception during the DRX shutdown period.

50. The method of claim 36, further comprising: The side link transmission is skipped during the DRX shutdown period.

51. A method for performing wireless communication at a first wireless device, comprising: Send a sidelink discovery message that includes information about the first discontinuous reception DRX of the first wireless device; Receive a message from the second wireless device containing a resource reservation for resources that only appear during the DRX enable period of the first wireless device; as well as During the DRX activation period of the first DRX, sidelink communication is received on the resource.

52. The method of claim 51, wherein the sidelink discovery message includes a sidelink announcement message, wherein sending the sidelink announcement message includes: The broadcast includes the sidelink announcement message containing the information about the first DRX of the first wireless device.

53. The method of claim 52, further comprising: Receive a response to the sidelink announcement message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

54. The method of claim 53, further comprising: The second wireless device communicates on the side link using resources shared by the first and second DRXs.

55. The method of claim 52, further comprising: Receive a sidelink connection request from the second wireless device; as well as Send the sidelink discovery message as a response to the sidelink connection request from the second wireless device.

56. The method of claim 55, further comprising: Receive a response to the sidelink discovery message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

57. The method of claim 56, further comprising: The second wireless device communicates on the side link using resources shared by the first and second DRXs.

58. The method of claim 52, wherein the sidelink communication on the resource occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

59. A method for wirelessly communicating with a first wireless device at a second wireless device, comprising: Receive a sidelink discovery message from the first wireless device, including information about the first discontinuous reception DRX of the first wireless device; Send a message to the first wireless device to reserve resources that only appear during the DRX enable period of the first wireless device; as well as During the DRX activation period of the first DRX, a sidelink communication is sent to the first wireless device.

60. The method of claim 59, wherein the sidelink discovery message includes a broadcast sidelink announcement message, wherein the method further includes: Send a reply to the broadcast sidelink announcement message from the first wireless device, wherein the reply includes DRX information about the second DRX of the second wireless device.

61. The method of claim 60, further comprising: The first wireless device communicates on the side link using resources shared by the first DRX and the second DRX.

62. The method of claim 59, further comprising: Send a sidelink connection request to the first wireless device, and then receive the sidelink discovery message as a response to the sidelink connection request; as well as Send a response to the sidelink discovery message, wherein the response includes DRX information about the second DRX of the second wireless device.

63. The method of claim 62, further comprising: The first wireless device communicates on the side link using resources shared by the first DRX and the second DRX.

64. The method of claim 59, wherein the sidelink communication occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

65. An apparatus for performing wireless communication at a first wireless device, comprising: A means for determining the resources used for sidelink communication during the DRX activation period of a discontinuous reception DRX of a second wireless device. A means for sending a message to the second wireless device, the message reserving the resource that appears only during the DRX activation period of the second wireless device; as well as A means for transmitting a sidelink transmission to the second wireless device on the resource during the DRX activation period of the DRX.

66. The apparatus of claim 65, wherein the apparatus further comprises: A means for performing both sidelink transmission and sidelink reception during the DRX activation period.

67. The apparatus of claim 65, wherein the apparatus further comprises: A means for performing sidelink reception during the DRX activation period.

68. The equipment of claim 65, wherein the equipment further comprises: A means for performing sidelink transmissions during the DRX activation period.

69. The apparatus of claim 65, wherein the means for transmitting the message comprises: A means for sending the message during the same DRX enable duration in which the resources are reserved for the side link transmission.

70. The apparatus of claim 65, wherein the means for transmitting the message comprises: A means for sending the message within a period of time that is longer than the previous DRX activation period during which the resources are reserved for transmission of the side link.

71. The equipment of claim 65, further comprising: A means for reserving the resource based on the resource during a first DRX activation period of the first wireless device and a second DRX activation period of the second wireless device.

72. The equipment of claim 65, further comprising: A means for performing one or more of the sidelink transmission, sidelink reception, or sidelink sensing during the DRX activation period without extending the DRX activation period.

73. The equipment as claimed in claim 72, further comprising: A means for performing one or more of the sidelink transmission, the sidelink reception, or the sidelink sensing within the DRX activation period without extending the DRX activation period, based on the resource allocation type for the sidelink communication.

74. The apparatus of claim 73, wherein the resource allocation type corresponds to mode 2 sidelink resource allocation.

75. The equipment as claimed in claim 74, further comprising: A means for extending the DRX enable duration based on a DRX inactivity timer if the first wireless device operates based on a mode 1 side link resource allocation from a network node.

76. The equipment of claim 65, further comprising: A means for postponing a retransmission to the next DRX activation duration if the retransmission would extend beyond the DRX activation duration.

77. The equipment of claim 65, further comprising: A means for receiving DRX configuration for an access link from a network node, wherein a first DRX mode for the side link is the same as a second DRX mode for the access link; A means for extending the DRX activation duration for the access link; as well as A means for applying the non-extended DRX enable duration to the side link.

78. The equipment of claim 65, further comprising: A means for receiving DRX configuration for an access link from a network node, wherein a first DRX mode for a side link is different from a second DRX mode for the access link; as well as Means for extending the activation duration of the second DRX mode for the access link.

79. The apparatus of claim 65, wherein the sidelink transmission to the second wireless device on the resource occurs during the DRX activation period of the second wireless device's DRX cycle.

80. The equipment as claimed in claim 65, further comprising: A means for performing side-link sensing during the DRX activation period; as well as A means for skipping the side link sensing during the DRX shutdown period.

81. The equipment as claimed in claim 67, further comprising: A means for skipping the side link reception during the DRX shutdown period.

82. The equipment of claim 68, further comprising: A means for skipping the side link transmission during the DRX shutdown period.

83. An apparatus for performing wireless communication at a first wireless device, comprising: A means for sending a sidelink discovery message including information about the first discontinuous reception DRX of the first wireless device; A means for receiving from a second wireless device a message having a resource reservation for resources that appear only during the DRX activation period of the first wireless device; as well as A means for receiving sidelink communication on the resource during the DRX activation period of the first DRX.

84. The apparatus of claim 83, wherein the sidelink discovery message includes a sidelink announcement message, wherein the means for sending the sidelink announcement message includes: A means for broadcasting the sidelink announcement message including information about the first DRX of the first wireless device.

85. The equipment as claimed in claim 84, further comprising: A means for receiving a response to the sidelink announcement message from a second wireless device, wherein the response includes DRX information about a second DRX of the second wireless device.

86. The equipment as claimed in claim 85, further comprising: A means for communicating with a second wireless device on a side link based on resources shared by the first DRX and the second DRX.

87. The equipment as claimed in claim 84, further comprising: A means for receiving a sidelink connection request from the second wireless device; as well as A means for sending the sidelink discovery message as a response to the sidelink connection request from the second wireless device.

88. The equipment as claimed in claim 87, further comprising: A means for receiving a response to the sidelink discovery message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

89. The equipment as claimed in claim 88, further comprising: A means for communicating with a second wireless device on a side link based on resources shared by the first DRX and the second DRX.

90. The apparatus of claim 83, wherein the sidelink communication on the resource occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

91. An apparatus for wirelessly communicating with a first wireless device at a second wireless device, comprising: A means for receiving from the first wireless device a sidelink discovery message including information about the first discontinuous reception DRX of the first wireless device; A means for sending a message to the first wireless device to reserve resources that appear only during the DRX activation period of the first wireless device; as well as A means for sending sidelink communication to the first wireless device during the DRX activation period of the first DRX.

92. The apparatus of claim 91, wherein the sidelink discovery message includes a broadcast sidelink announcement message, wherein the apparatus further comprises: A means for sending a response to the broadcast sidelink announcement message from the first wireless device, wherein the response includes DRX information regarding the second DRX of the second wireless device.

93. The equipment as claimed in claim 92, further comprising: A means for communicating with the first wireless device on a side link based on resources shared by the first DRX and the second DRX.

94. The equipment as claimed in claim 91, further comprising: A means for sending a sidelink connection request to the first wireless device and then receiving a sidelink discovery message as a response to the sidelink connection request; as well as A means for sending a response to the sidelink discovery message, wherein the response includes DRX information about the second DRX of the second wireless device.

95. The equipment as claimed in claim 94, further comprising: A means for communicating with the first wireless device on a side link based on resources shared by the first DRX and the second DRX.

96. The apparatus of claim 91, wherein the sidelink communication occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

97. A non-transitory computer-readable storage medium storing computer-executable code at a first wireless device, the code causing the first wireless device to: Determine the resources used for sidelink communication during the DRX activation period of the discontinuous reception DRX of the second wireless device; A message is sent to the second wireless device, the message reserving the resources that only occur during the DRX activation period of the second wireless device; and During the DRX activation period of the DRX, a sidelink transmission is sent to the second wireless device on the resource.

98. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to perform both sidelink transmission and sidelink reception during the DRX enable duration.

99. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to perform sidelink reception during the DRX activation duration.

100. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to perform a sidelink transmission during the DRX activation duration.

101. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to send the message during the same DRX enable duration in which the resources are reserved for the sidelink transmission.

102. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: transmit the message during a previous DRX activation period compared to the DRX activation period during which the resources are reserved for the sidelink transmission.

103. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: The resources are reserved based on the first DRX activation duration of the first wireless device and the second DRX activation duration of the second wireless device.

104. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: One or more of the sidelink transmission, sidelink reception, or sidelink sensing are performed during the DRX activation period without extending the DRX activation period.

105. The non-transient computer-readable storage medium of claim 104, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Based on the resource allocation type used for the sidelink communication, one or more of the sidelink transmission, the sidelink reception, or the sidelink sensing are performed within the DRX activation period without extending the DRX activation period.

106. The non-transient computer-readable storage medium of claim 105, wherein the resource allocation type corresponds to mode 2 sidelink resource allocation.

107. The non-transient computer-readable storage medium of claim 106, wherein the code, when executed by the one or more processors, further causes the first wireless device to: If the first wireless device operates based on mode 1 side link resource allocation from the network node, the DRX activation duration is extended based on the DRX inactive timer.

108. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: If a retransmission would extend the DRX enable duration beyond the specified duration, the retransmission will be postponed to the next DRX enable duration.

109. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Receive DRX configuration for the access link from the network node, wherein the first DRX mode for the side link is the same as the second DRX mode for the access link; Extend the DRX activation duration for the access link; and The non-extended DRX enable duration is used for the side link.

110. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Receive DRX configuration for the access link from the network node, wherein a first DRX mode for the side link is different from a second DRX mode for the access link; and Extend the activation duration of the second DRX mode for the access link.

111. The non-transient computer-readable storage medium of claim 97, wherein the sidelink transmission to the second wireless device on the resource occurs during the DRX enable duration of the DRX cycle of the second wireless device.

112. The non-transient computer-readable storage medium of claim 97, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Sidelink sensing is performed during the DRX activation period; and The side link sensing is skipped during the DRX shutdown period.

113. The non-transient computer-readable storage medium of claim 99, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Skip the side link reception during the DRX shutdown period.

114. The non-transient computer-readable storage medium of claim 100, wherein the code, when executed by the one or more processors, further causes the first wireless device to: The side link transmission is skipped during the DRX shutdown period.

115. A non-transitory computer-readable storage medium storing computer-executable code at a first wireless device, the code causing the first wireless device to: Send a sidelink discovery message that includes information about the first discontinuous reception DRX of the first wireless device; Receive a message from the second wireless device containing a resource reservation for resources that only appear during the DRX enable period of the first wireless device; as well as During the DRX activation period of the first DRX, sidelink communication is received on the resource.

116. The non-transient computer-readable storage medium of claim 115, wherein the sidelink discovery message includes a sidelink announcement message, wherein the code, when executed by the one or more processors, further causes the first wireless device to: broadcast the sidelink announcement message including the information about the first DRX of the first wireless device.

117. The non-transient computer-readable storage medium of claim 116, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Receive a response to the sidelink announcement message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

118. The non-transient computer-readable storage medium of claim 117, wherein the code, when executed by the one or more processors, further causes the first wireless device to: The second wireless device communicates on the side link using resources shared by the first and second DRXs.

119. The non-transient computer-readable storage medium of claim 116, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Receive a sidelink connection request from the second wireless device; and Send the sidelink discovery message as a response to the sidelink connection request from the second wireless device.

120. The non-transient computer-readable storage medium of claim 119, wherein the code, when executed by the one or more processors, further causes the first wireless device to: Receive a response to the sidelink discovery message from the second wireless device, wherein the response includes DRX information about the second DRX of the second wireless device.

121. The non-transient computer-readable storage medium of claim 120, wherein the code, when executed by the one or more processors, further causes the first wireless device to: The second wireless device communicates on the side link using resources shared by the first and second DRXs.

122. The non-transient computer-readable storage medium of claim 115, wherein the sidelink communication on the resource occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

123. A non-transitory computer-readable storage medium storing computer-executable code at a second wireless device, the code causing the second wireless device to: Receive a sidelink discovery message from the first wireless device, including information about the first discontinuous reception DRX of the first wireless device; Send a message to the first wireless device to reserve resources that only occur during the DRX activation period of the first wireless device; and During the DRX activation period of the first DRX, a sidelink communication is sent to the first wireless device.

124. The non-transient computer-readable storage medium of claim 123, wherein the sidelink discovery message includes a broadcast sidelink announcement message, wherein the code, when executed by one or more processors, further enables the second wireless device to: Send a reply to the broadcast sidelink announcement message from the first wireless device, wherein the reply includes DRX information about the second DRX of the second wireless device.

125. The non-transient computer-readable storage medium of claim 124, wherein the code, when executed by the one or more processors, further enables the second wireless device to: The first wireless device communicates on the side link using resources shared by the first DRX and the second DRX.

126. The non-transient computer-readable storage medium of claim 123, wherein the code, when executed by the one or more processors, further enables the second wireless device to: Send a sidelink connection request to the first wireless device, and then receive the sidelink discovery message as a response to the sidelink connection request; and Send a response to the sidelink discovery message, wherein the response includes DRX information about the second DRX of the second wireless device.

127. The non-transient computer-readable storage medium of claim 126, wherein the code, when executed by the one or more processors, further enables the second wireless device to: The first wireless device communicates on the side link using resources shared by the first DRX and the second DRX.

128. The non-transient computer-readable storage medium of claim 123, wherein the sidelink communication occurs during the DRX enable duration of the first DRX cycle of the first wireless device.

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