Methods, apparatus and media for wireless communication

Abstract

Certain aspects of this disclosure provide techniques for independent sidelink beam failure recovery. In some aspects, the method performed by a first user equipment typically includes: communicating with a second UE on a first communication link between a first UE and a second UE while operating in a sidelink discontinuous reception (DRX) mode; during a wake-up state in the sidelink DRX mode, transmitting at least one of a plurality of beam failure detection reference signals associated with the first communication link, wherein the period of the wake-up state in the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals; and detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefit and priority of U.S. Patent Application No. 17 / 344,733, filed June 10, 2021, which claims the benefit and priority of U.S. Provisional Application No. 63 / 038,513, filed June 12, 2020, which has been assigned to its assignee and whose entire contents are expressly incorporated herein by reference, as fully set forth below, and for all applicable purposes. Technical Field

[0003] This disclosure relates to wireless communications, and more specifically, to techniques for sidelink discontinuous reception (DRX) and independent sidelink beam failure detection and recovery. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. These wireless communication systems can employ multiple access technologies that enable communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, LTE-A Advanced (LTE-A) system, Code Division Multiple Access (CDMA) system, Time Division Multiple Access (TDMA) system, Frequency Division Multiple Access (FDMA) system, Orthogonal Frequency Division Multiple Access (OFDMA) system, Single Carrier Frequency Division Multiple Access (SC-FDMA) system, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system.

[0005] These multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate at the city, country, region, and even global levels. New radios (e.g., 5G NR) are examples of emerging telecommunications standards. NR is a set of enhancements to the LTE mobile standard issued by 3GPP. NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and better integrating with other open standards using OFDMA with a cyclic prefix (CP) on both the downlink (DL) and uplink (UL). To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0006] However, with the continued growth in demand for mobile broadband access, there is a need for further improvements to NR and LTE technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunications standards that employ these technologies. Summary of the Invention

[0007] The systems, methods, and apparatuses of this disclosure each have several aspects, none of which is solely responsible for their desired properties. Without limiting the scope of this disclosure as expressed by the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description," one will understand how the features of this disclosure provide advantages including improved independent sidelink beam failure recovery.

[0008] Certain aspects of the subject matter described in this disclosure can be implemented in a method of wireless communication by a first user equipment (UE). This method typically includes: communicating with a second UE on a first communication link between the first UE and the second UE while operating in a sidelink discontinuous reception (DRX) mode; during a wake-up state of the sidelink DRX mode, transmitting at least one of a plurality of beam failure detection reference signals associated with the first communication link, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals; and detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal.

[0009] Certain aspects of the subject matter described in this disclosure can be implemented by a first user equipment (UE) in an apparatus for wireless communication. The apparatus includes a memory and one or more processors, the memory including executable instructions configured to execute the executable instructions and cause the apparatus to: communicate with a second UE on a first communication link between the first UE and the second UE while operating in a sidelink discontinuous reception (DRX) mode; during a wake-up state of the sidelink DRX mode, transmit at least one of a plurality of beam failure detection reference signals associated with the first communication link, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals; and detect that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal. The apparatus may also include a memory coupled to at least one processor.

[0010] Certain aspects of the subject matter described in this disclosure can be implemented by a first user equipment (UE) in an apparatus for wireless communication. The apparatus typically includes: components for communicating with a second UE on a first communication link between the first UE and the second UE when operating in a sidelink discontinuous reception (DRX) mode; components for transmitting at least one of a plurality of beam failure detection reference signals associated with the first communication link during a wake-up state of the sidelink DRX mode, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals; and components for detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal.

[0011] Certain aspects of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium for wireless communication by a first user equipment (UE). The non-transitory computer-readable medium includes executable instructions that, when executed by one or more processors of the apparatus, cause the apparatus, while operating in a sidelink discontinuous reception (DRX) mode, to communicate with a second UE on a first communication link between the first UE and the second UE; during a wake-up state of the sidelink DRX mode, to transmit at least one of a plurality of beam failure detection reference signals associated with the first communication link, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals; and to detect, based on the at least one beam failure detection reference signal, that the first communication link between the first UE and the second UE has failed.

[0012] Certain aspects of the subject matter described in this disclosure can be implemented in a method of wireless communication by a second user equipment (UE). This method typically includes: communicating with a first UE on a first communication link between a first UE and a second UE during a wake-up state in a sidelink discontinuous reception (DRX) mode, wherein the period of the wake-up state in the sidelink DRX mode is based on the period for receiving a plurality of beam failure detection reference signals associated with the first communication link; and monitoring the plurality of beam failure detection reference signals according to the period for receiving the plurality of beam failure detection reference signals during the wake-up state in the sidelink DRX mode.

[0013] Certain aspects of the subject matter described in this disclosure can be implemented by a second user equipment (UE) in an apparatus for wireless communication. The apparatus includes a memory and one or more processors, the memory including executable instructions configured to execute the executable instructions and cause the apparatus to communicate with the first UE on a first communication link between the first UE and the second UE during a wake-up state in a sidelink discontinuous reception (DRX) mode, wherein the period of the wake-up state in the sidelink DRX mode is based on a period for receiving a plurality of beam failure detection reference signals associated with the first communication link; and during the wake-up state in the sidelink DRX mode, the plurality of beam failure detection reference signals are monitored according to the period for receiving the plurality of beam failure detection reference signals. The apparatus may also include a memory coupled to at least one processor.

[0014] Certain aspects of the subject matter described in this disclosure can be implemented by a second user equipment (UE) in an apparatus for wireless communication. The apparatus typically includes: components for communicating with a first UE on a first communication link between a first UE and a second UE during a wake-up state in a sidelink discontinuous reception (DRX) mode, wherein the period of the wake-up state in the sidelink DRX mode is based on a period for receiving a plurality of beam failure detection reference signals associated with the first communication link; and components for monitoring a plurality of beam failure detection reference signals according to the period for receiving the plurality of beam failure detection reference signals during the wake-up state in the sidelink DRX mode.

[0015] Certain aspects of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium for wireless communication by a second user equipment (UE). The non-transitory computer-readable medium includes executable instructions that, when executed by one or more processors of the apparatus, cause the apparatus to: communicate with the first UE on a first communication link between the first UE and the second UE during a wake-up state in a sidelink discontinuous reception (DRX) mode, wherein the period of the wake-up state in the sidelink DRX mode is based on a period for receiving a plurality of beam failure detection reference signals associated with the first communication link; and during the wake-up state in the sidelink DRX mode, monitor the plurality of beam failure detection reference signals according to the period for receiving the plurality of beam failure detection reference signals.

[0016] The features and technical advantages of the examples according to this disclosure have been outlined rather broadly above to facilitate a better understanding of the detailed description that follows. Additional features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures for carrying out the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and operation, and the associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and is not intended to define limitations of the claims.

[0017] While aspects and embodiments have been described in this application 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 innovations described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, embodiments and / or uses may be implemented by integrating chip-level embodiments and other devices based on non-modular components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specific to a particular use case or application, a wide variety of applicability to the described innovations is possible. The range of implementations can be from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or OEM devices or systems incorporating one or more aspects of the innovations. In some practical settings, devices incorporating the described aspects and features may also need to include additional components and features for implementing and practicing the claimed and described embodiments. For example, the transmission and reception of wireless signals must involve multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors(multiple), interleavers, adders / summers, etc.). The intent is that the innovations described herein can be implemented in a variety of devices, chip-level components, systems, distributed arrangements, end-user equipment, etc., of different sizes, shapes, and constructions. Attached Figure Description

[0018] A more detailed description of some aspects of the above brief overview is provided to enable a more thorough understanding of the features of this disclosure, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only some typical aspects of this disclosure and should not be considered as limiting its scope, as other equally valid aspects can be recognized by this description.

[0019] Figure 1 This is a conceptual illustration of a block diagram of an example wireless communication network according to certain aspects of this disclosure.

[0020] Figure 2 This is a conceptual block diagram illustrating the design of an example base station (BS) and user equipment (UE) according to certain aspects of this disclosure.

[0021] Figure 3 These are example frame formats for certain wireless communication systems (e.g., New Radio (NR)) according to certain aspects of this disclosure.

[0022] Figure 4A and Figure 4B An illustrated representation of an example vehicle-to-everything (V2X) system according to certain aspects of this disclosure is shown.

[0023] Figure 5 This is a call flow diagram illustrating an example resource allocation for sidelink transmission according to certain aspects of this disclosure.

[0024] Figure 6 This is an illustration of an example autonomous resource selection call flowchart for sidelink transmission according to certain aspects of this disclosure.

[0025] Figure 7 This is a flowchart illustrating an example operation of a first UE performing wireless communication according to certain aspects of this disclosure.

[0026] Figure 8 This is a flowchart illustrating an example operation of a second UE performing wireless communication according to certain aspects of this disclosure.

[0027] Figures 9-10 Aspects of an example communication device according to certain aspects of this disclosure are described.

[0028] For ease of understanding, the same reference numerals are used where possible to denote common elements in the figures. Elements disclosed in one aspect are intended to be usefully applied to other aspects without specific description. Detailed Implementation

[0029] This disclosure provides apparatus, methods, processing systems, and computer-readable media for sidelink discontinuous reception (DRX) and independent sidelink beam failure detection and recovery. For example, in some cases, two user equipments (UEs) in a wireless communication network can communicate with each other via one or more transmit beams and one or more receive beams using a sidelink communication link / channel. During sidelink communication, the UE can also operate according to a DRX mode that allows each UE to transition to a sleep state to conserve power. However, operating in the sleep state of DRX mode can interfere with resources used for transmitting and receiving beam failure detection reference signals for detecting sidelink communication link failures, potentially leading to undetected sidelink communication link failures. Therefore, failure to detect sidelink communication link failures can result in unnecessary transmissions that will ultimately be unreceived, thus wasting time and frequency resources in the wireless communication network, as well as power resources at the UE. Furthermore, since the sleep states of DRX mode may differ for the two UEs, it may be difficult for these UEs to rebuild the sidelink communication link.

[0030] Therefore, to avoid interference between the DRX mode and the resources of the beam failure detection reference signal, aspects of this disclosure provide a technique for configuring the period associated with the DRX mode based on the period associated with the resources of the beam failure detection reference signal. By basing the period of the DRX mode on the period associated with the resources of the beam failure detection reference signal, the possibility of interference between the DRX mode and the resources of the beam failure detection reference signal can be reduced. This also reduces the possibility of missing the detection of the failed side link communication link, which helps to avoid unnecessary transmissions on the failed side link communication link (e.g., saving time, frequency, and power resources) and facilitates the rapid and efficient reconstruction of the failed side link communication link.

[0031] The following description provides examples of sidelink DRX and independent sidelink beam failure detection and recovery, and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the functionality and arrangement of the elements discussed without departing from the scope of this disclosure. Various processes or components may be appropriately omitted, substituted, or added to the various examples. For example, the described methods may be performed in a different order than described, and individual steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement an apparatus or practice. Furthermore, the scope of this disclosure is intended to cover such apparatus or methods that are practiced using structures, functions, or structures and functions other than or different from the aspects of this disclosure set forth herein. It should be understood that any aspect of the disclosure herein may be embodied by one or more elements of the claims. The term “exemplary” as used herein means “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as more preferred or advantageous than other aspects.

[0032] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific Radio Access Technology (RAT) and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, subcarrier, channel, tone, subband, etc. Each frequency can support a single RAT within a given geographical area to avoid interference between wireless networks using different RATs.

[0033] The techniques described herein can be used in a variety of wireless network and radio technologies. While the subject matter may use terms commonly associated with 3G, 4G and / or newer radio technologies (e.g., 5G NR) to describe the aspects, the aspects of this disclosure can be applied to other generation-based communication systems.

[0034] NR access can support a variety of wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or above), millimeter wave (mmW) targeting high carrier frequencies (e.g., 24 GHz to 53 GHz or above), massive machine-type communication (mMTC) targeting non-backward compatible MTC technology, and / or mission-critical communication targeting ultra-reliable low-latency communication (URLLC). These services may include latency and reliability requirements. These services can also have different transmission time intervals (TTIs) to meet their respective quality of service (QoS) requirements. Furthermore, these services can coexist in the same subframe. NR supports beamforming, and beam direction can be dynamically configured. Precoded MIMO transmission can also be supported. MIMO configurations in DL can support up to 8 transmit antennas, multi-layer DL transmission with up to 8 streams, and up to 2 streams per UE. Multi-layer transmission with up to 2 streams per UE can be supported. Up to 8 serving cells can support aggregation of multiple cells.

[0035] Figure 1 An example wireless communication network 100 in which various aspects of this disclosure can be implemented is illustrated. For example, the wireless communication network 100 may be an NR system (e.g., a 5G NR network). Figure 1 As shown, the wireless communication network 100 can communicate with the core network 132. The core network 132 can communicate with one or more BS110s and / or UEs 120 in the wireless communication network 100 via one or more interfaces.

[0036] According to certain aspects, as described herein, UE 120 can be configured for independent beam failure recovery. For example, as shown, according to aspects of this disclosure, UEs 120a and 120b may respectively include sidelink beam failure recovery (BFR) modules 122a and 122b, which can be configured for sidelink discontinuous reception (DRX) and independent sidelink beam failure detection and recovery as described herein. For example, in some cases, sidelink BFR modules 122a and 122b can be configured to perform… Figure 7 or Figure 8 One or more of the illustrated operations, as well as other operations disclosed herein for sidelink DRX and independent sidelink beam failure detection and recovery.

[0037] like Figure 1As shown, the wireless communication network 100 may include multiple BS110a-z (each BS is also individually referred to herein as BS110 or collectively as BS110) and other network entities. BS110 may provide communication coverage for a specific geographic area (sometimes referred to as a "cell"), which may be fixed or movable depending on the location of the mobile BS110. In some examples, BS110 may use any suitable transport network, interconnecting with each other and / or with one or more other BSs or network nodes (not shown) in the wireless communication network 100 via various types of backhaul interfaces (e.g., direct physical connection, wireless connection, virtual network, etc.). Figure 1 In the example shown, base stations 110a, 110b, and 110c can be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x can be a pico BS for pico cell 102x. Base stations 110y and 110z can be femto BSs for femto cells 102y and 102z, respectively. A BS can support one or more cells.

[0038] BS110 communicates with UEs 120a-y (each also individually referred to as UE 120 or collectively as UE 120) in the wireless communication network 100. UEs 120 (e.g., 120x, 120y, etc.) may be distributed throughout the wireless communication network 100, and each UE 120 may be fixed or mobile. The wireless communication network 100 may also include relay stations (e.g., relay station 110r), also referred to as relays, which receive data and / or other information transmissions from upstream stations (e.g., BS110a or UE 120r) and transmit data and / or other information transmissions to downstream stations (e.g., UE 120 or BS110), or relay transmissions between UEs 120 to facilitate communication between devices.

[0039] Network controller 130 can communicate with a group of BS110s and provide coordination and control for these BS110s (e.g., via backhaul). In some aspects, network controller 130 can communicate with core network 132 (e.g., 5G core network (5GC)), which provides various network functions such as access and mobility management, session management, user plane functions, policy control functions, authentication server functions, unified data management, application functions, network presentation functions, network repository functions, network slice selection functions, etc.

[0040] Figure 2 The illustration shows example components of BS110a and UE 202 that can be used to implement aspects of this disclosure. UE 202 may include... Figure 1 UE 120a, 120b or UE 120c.

[0041] At BS110a, the transmitting processor 220 can receive data from the data source 212 and control information from the controller / processor 240. The control information can be used for the Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Group Common PDCCH (GC PDCCH), etc. This data can also be used for the Physical Downlink Shared Channel (PDSCH), etc. The Media Access Control (MAC)-Control Element (MAC-CE) is a MAC layer communication structure that can be used for exchanging control commands between wireless nodes. The MAC-CE can be carried in shared channels such as the Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH), or Physical Sidelink Shared Channel (PSSCH).

[0042] Processor 220 can process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. Transmit processor 220 can also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS). If applicable, transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols, and can provide output symbol streams to the modulators (MODs) in transceivers 232a-232t. Each modulator in transceivers 232a-232t can process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. Downlink signals from the modulators in transceivers 232a-232t can be transmitted via antennas 234a-234t respectively.

[0043] At UE 202, antennas 252a-252r can receive downlink signals from BS110a and can provide the received signals to demodulators (DEMODs) in transceivers 254a-254r respectively. Each demodulator in transceivers 254a-254r can condition (e.g., filter, amplify, down-convert, and digitize) its respective received signal to obtain an input sample. Each demodulator can further process the input sample (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide the detected symbols. Receiver processor 258 can process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data of UE 202 to data sink 260, and provide decoding control information to controller / processor 280.

[0044] On the uplink, at UE 202, the transmitting processor 264 can receive and process data from data source 262 (e.g., for the Physical Uplink Shared Channel (PUSCH)) and control information from controller / processor 280 (e.g., for the Physical Uplink Control Channel (PUCCH)). The transmitting processor 264 can also generate reference symbols for reference signals (e.g., for Sounding Reference Signals (SRS)). If applicable, the symbols from the transmitting processor 264 can be pre-encoded by the TXMIMO processor 266, further processed by modulators in transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to BS110a. At BS110a, if applicable, the uplink signal from UE 202 can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236, and further processed by receiving processor 238 to obtain decoded data and control information transmitted by UE 202. The receiver processor 238 can provide decoded data to the data sink 239 and decoded control information to the controller / processor 240.

[0045] Memory 242 and 282 can store data and program code for BS110a and UE 202, respectively. Scheduler 244 can schedule UE to transmit data on the downlink and / or uplink.

[0046] The antenna 252, processors 266, 258, 264 and / or controller / processor 280 of UE 202 and / or the antenna 234, processors 220, 230, 238 and / or controller / processor 240 of BS110a can be used to perform the various techniques and methods described herein. For example, such as Figure 2As shown, according to the aspects described herein, the controller / processor 280 of UE 202 includes a sidelink beam failure recovery (BFR) module 281, which can be configured for sidelink discontinuous reception (DRX) and independent sidelink beam failure detection and recovery. For example, in some cases, the sidelink BFR module 281 can be configured to perform... Figure 7 or Figure 8 The operations illustrated in one or more of the diagrams, as well as other operations described herein for independent beam failure recovery. Although shown at the controller / processor, other components of UE 202 and BS110a can be used to perform the operations described herein.

[0047] NR can utilize Orthogonal Frequency Division Multiplexing (OFDM) with a cyclic prefix (CP) on both the uplink and downlink. NR can support half-duplex operation using Time Division Duplex (TDD). OFDM and Single-Carrier Frequency Division Multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, which are often referred to as tones, bins, etc. Each subcarrier can be modulated with data. Modulation symbols can be transmitted in the frequency domain using OFDM and in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers can depend on the system bandwidth. The minimum resource allocation, called a resource block (RB), can be 12 consecutive subcarriers. The system bandwidth can also be divided into subbands. For example, a subband can cover multiple RBs. NR can support a basic subcarrier spacing (SCS) of 15 kHz and can define other SCSs (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.) with respect to the basic SCS.

[0048] Figure 3 This is a diagram illustrating an example of NR frame format 300. The transmission timeline for each of the downlink and uplink can be divided into radio frame units. Each radio frame can have a predetermined duration (e.g., 10 ms) and can be divided into 10 subframes, each 1 ms, indexed from 0 to 9. Depending on the SCS, each subframe can include a variable number of time slots (e.g., 1, 2, 4, 8, 16... time slots). Depending on the SCS, each time slot can include a variable number of symbol periods (e.g., 7, 12, or 14 symbols). An index can be assigned to the symbol periods in each time slot. A micro-time slot, which can be referred to as a sub-time slot structure, is a transmission time interval with a duration less than one time slot (e.g., 2, 3, or 4 symbols). Each symbol in a time slot can indicate the link direction of data transmission (e.g., DL, UL, or flexible), and the link direction for each subframe can be dynamically switched. The link direction can be based on the time slot format. Each time slot can include DL / UL data and DL / UL control information.

[0049] In NR, a Synchronization Signal Block (SSB) is transmitted. In some aspects, SSBs can be transmitted within a burst, where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and / or beam refinement). SSBs include the PSS, SSS, and dual-symbol PBCH. SSBs can be transmitted at fixed time slot locations, for example... Figure 3 The symbols 0-3 are shown. The UE can use PSS and SSS for cell search and acquisition. PSS provides half-frame timing, and SS provides CP length and frame timing. PSS and SSS can provide cell identity. PBCH carries basic system information such as downlink system bandwidth, intra-radio frame timing information, SS burst set period, system frame number, etc. SSB can be organized into SS bursts to support beam scanning. Further system information, such as Residual Minimum System Information (RMSI), System Information Block (SIB), and Other System Information (OSI), can be transmitted on the Physical Downlink Shared Channel (PDSCH) in certain subframes. For example, for millimeter wave, SSB can be transmitted up to 64 times with up to 64 different beam directions. Multiple transmissions of SSB are called SS burst sets. SSBs in an SS burst set can be transmitted in the same frequency region, while SSBs in different SS burst sets can be transmitted in different frequency regions.

[0050] In some examples, communication between UE 120 and BS110 is referred to as an access link. The access link can be provided via the Uu interface. Communication between devices such as UEs can be referred to as a side link.

[0051] In some examples, two or more subordinate entities (e.g., UE 120) can communicate with each other using sidelink signaling. Real-world applications of such sidelink communication can include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communication, Internet of Things (IoE) communication, IoT communication, mission-critical mesh, and / or various other suitable applications. Typically, sidelink signaling can refer to a signal transmitted from one subordinate entity (e.g., UE 120a) to another subordinate entity (e.g., another UE 120) without relaying the communication through a scheduling entity (e.g., UE 120 or BS110), even if that scheduling entity may be used for scheduling and / or control purposes. In some examples, licensed spectrum can be used to transmit sidelink signals (unlike WLANs, which typically use unlicensed spectrum). An example of sidelink communication is PC5, used, for example, in V2V, LTE, and / or NR.

[0052] Various sidelink channels can be used for sidelink communication, including the Physical Sidelink Discovery Channel (PSDCH), Physical Sidelink Control Channel (PSCCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Feedback Channel (PSFCH). The PSDCH can carry a discovery expression that enables neighboring devices to discover each other. The PSCCH can carry control signaling, such as sidelink resource configuration and other parameters for data transmission, and the PSSCH can carry data transmission. The PSFCH can carry feedback, such as CSI related to sidelink channel quality.

[0053] Figure 4A and Figure 4B A schematic representation of an example V2X system according to some aspects of this disclosure is shown. For example, Figure 4A and Figure 4B The vehicle shown can communicate via a sidelink channel and can perform the sidelink CSI report described herein.

[0054] Figure 4A and Figure 4B The V2X system provided in China offers two complementary transmission modes. Figure 4A The first transmission mode illustrated by example involves direct communication between participants who are close to each other in a local area (e.g., also known as sidelink communication). Figure 4B The second transmission mode, illustrated by way of example, involves network communication over a network, which can be implemented via a Uu interface (e.g., a wireless communication interface between a radio access network (RAN) and a UE).

[0055] refer to Figure 4A The V2X system 400 (e.g., including vehicle-to-vehicle (V2V) communication) is illustrated as having two vehicles 402 and 404. A first transmission mode allows direct communication between different participants in a given geographic location. As illustrated, the vehicles may have a wireless communication link 406 with a person (V2P) (e.g., via a UE) through a PC5 interface. Communication between vehicles 402 and 404 can also occur via PC5 interface 408. Similarly, communication from vehicle 402 to other highway components (e.g., highway component 410) such as traffic signals or signs (V2I) can occur via PC5 interface 412. Figure 4AEach communication link illustrated allows for bidirectional communication between components, thus each component can act as both a transmitter and receiver of information. The V2X system 400 can be a self-managing system implemented without assistance from network entities. This self-managing system enables improved spectrum efficiency, reduced costs, and increased reliability because no network service interruption occurs during handover operations for mobile vehicles. The V2X system can be configured to operate in licensed or unlicensed spectrum, allowing any vehicle equipped with the system to access public frequencies and share information. This cooperative / public spectrum operation allows for secure and reliable operation.

[0056] Figure 4B A V2X system 450 is shown for communication between vehicles 452 and 454 via network entity 456. This network communication can occur through discrete nodes such as BS (e.g., BS110a), which transmit and receive information to and from vehicles 452 and 454 (e.g., relaying information between them). Network communication via vehicle-to-network (V2N) links 458 and 410 can be used for long-distance communication between vehicles, such as to inform of the presence of a car accident some distance ahead along a road or highway. Wireless nodes can transmit other types of communication to vehicles, such as traffic flow conditions, road hazard warnings, environmental / weather reports, and service station availability. This data can be obtained from cloud-based shared services.

[0057] Roadside Units (RSUs) can be used. RSUs can be used for V2I communication. In some examples, RSUs can act as forwarding nodes to extend the coverage of UEs. In some examples, RSUs can be located in the same area as BSs or can be independent. RSUs can be classified in different ways. For example, RSUs can be classified as UE-type RSUs and micro NodeB-type RSUs. Micro NodeB-type RSUs have similar functionality to macro eNBs / gNBs. Micro NodeB-type RSUs can utilize the Uu interface. UE-type RSUs can be used to meet stringent Quality of Service (QoS) requirements by minimizing collisions and improving reliability. UE-type RSUs can use centralized resource allocation mechanisms to allow for efficient resource utilization. Critical information (e.g., traffic conditions, weather conditions, congestion statistics, sensor data, etc.) can be broadcast to UEs in the coverage area. Relay stations can rebroadcast critical information received from some UEs. UE-type RSUs can be reliable synchronization sources.

[0058] As mentioned above, some devices can communicate with each other on a sidelink channel. In some cases, this communication can be performed according to one or more resource allocation modes.

[0059] For example, in a resource allocation mode (e.g., gNB-assisted sidelink resource allocation mode 1), the serving gNB allocates sidelink resources for sidelink transmissions. Figure 5 As shown, UE 502 can transmit a Sidelink Buffer Status Report (SL-BSR) to the serving gNB 506 at 508 (e.g., via Uu). The SL-BSR provides the serving gNB 506 with information about the amount of sidelink data to the Logical Channel Identifier (LDIC) for each destination ID. gNB 506 receives the SL-BSR and at 510 provides UE 502 with an SL grant, which allocates resources for sidelink transmissions from sending UE 502 to receiving UE 504. At 512, UE 502 uses the granted resources to transmit the SL transmission to UE 504 (e.g., via PC5).

[0060] In another resource allocation mode (e.g., independent sidelink resource allocation mode 2), the UE can autonomously select sidelink resources (e.g., time and / or frequency resources) without assistance from the gNB. For example, as Figure 6 As shown, at 606, the transmitting UE 602 autonomously selects and reserves resources for sidelink transmission. At 608, the transmitting UE 602 uses the autonomously selected resources (e.g., via PC5) to transmit SL transmission to the receiving UE 604.

[0061] Introduction to millimeter-wave wireless communication

[0062] In wireless communication, the electromagnetic spectrum is typically subdivided into various categories, bands, channels, or other characteristics. This subdivision is usually based on wavelength and frequency, where frequency can also be referred to as carrier, subcarrier, channel, tone, or subband.

[0063] 5G networks can utilize several frequency ranges, which in some cases are defined by standards such as 3GPP standards. For example, the 3GPP technical standard TS 38.101 currently defines Frequency Range 1 (FR1) as encompassing 600MHz–6GHz, although specific uplink and downlink allocations may fall outside this general range. Therefore, FR1 is often (interchangeably) referred to as the “sub-6GHz” band.

[0064] Similarly, TS 38.101 currently defines Frequency Range 2 (FR2) as encompassing 26–41 GHz, although specific uplink and downlink allocations may again fall outside this general range. FR2 is sometimes (interchangeably) referred to as the “millimeter wave” (“mmW” or “mmWave”) band, although it differs from the Extremely High Frequency (EHF) band (30 GHz–300 GHz) recognized as a “millimeter wave” band by the International Telecommunication Union (ITU) because the wavelengths of these frequencies are between 1 mm and 10 mm.

[0065] Compared to lower-frequency communications, communications using millimeter-wave / near-millimeter-wave radio bands (e.g., 3 GHz–300 GHz) may have higher path loss and shorter range. Therefore, a millimeter-wave base station (e.g., BS110a) can utilize beamforming with a UE (e.g., UE 120a or 120b) to improve path loss and range. To do this, both the base station and the UE can each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming.

[0066] In some cases, a base station can transmit beamformed signals to a UE in one or more transmit directions. A UE can receive beamformed signals from a base station in one or more receive directions. The UE can also transmit beamformed signals to the base station in one or more transmit directions. The base station can receive beamformed signals from the UE in one or more receive directions. The base station and UE can then perform beamforming to determine the optimal transmit and receive directions for each of them. It is worth noting that the transmit and receive directions for the base station can be the same or different. Similarly, the transmit and receive directions for the UE can be the same or different. Furthermore, similar millimeter-wave beamforming techniques can be used between two UEs for communication on a sidelink.

[0067] Example sidelink DRX and standalone sidelink beam failure detection and recovery

[0068] As described above, two or more UEs (e.g., UE 120a and UE 120b) can communicate with each other via sidelink connections / channels using a specific resource allocation mode. In some cases, this resource allocation mode may include an independent sidelink resource allocation mode (e.g., mode 2), in which the UE can autonomously select sidelink resources (e.g., time and / or frequency resources) for communication without the assistance of a base station, such as... Figure 6 As shown in the diagram.

[0069] In many cases, when communicating via a sidelink connection, the UE can use millimeter-wave (mmWave) frequencies. When using mmWave, a sidelink connection can consist of one or more directional beams (e.g., transmit and receive beams) at each UE, generated using beamforming. For example, in some cases, UE 120a can use a first transmit (Tx) beam to transmit information to UE 120b on the sidelink, and UE 120b can use a first receive (Rx) beam to receive information from UE 120a. Similarly, UE 120b can use a second Tx beam to transmit information to UE 120a on the sidelink, and UE 120a can use a second Rx beam to receive information from UE 120b. In some cases, the first Tx beam of UE 120a and the first Rx beam of UE 120b can be referred to as a beampuppet link.

[0070] In some cases, each UE may be configured with resources for transmitting a beam failure detection reference signal, which is used to detect beam failures in beampup link / sidelink connections. In some cases, the beam failure detection reference signal may include a sidelink reference signal, such as a sidelink channel state information reference signal (CSI-RS) and / or a sidelink synchronization signal block (SSB). For example, a beam failure may occur when a first UE moves outside the area covered by a previous Tx / Rx beam used for communication with a second UE on a sidelink, making it impossible for the second UE to receive signals from the first UE, and vice versa. In this case, for example, a beam failure can be detected when the first UE transmits the beam failure detection reference signal using known resources but does not receive a response to the beam failure detection reference signal from the second UE. In other cases, a beam failure can be inferred when the first UE receives a connection request from the second UE on a Tx / Rx beam different from the Tx / Rx beam previously used between the first UE and the second UE.

[0071] In many cases, each UE can operate according to a discontinuous reception (DRX) mode associated with a sidelink connection. For example, DRX mode allows the UE to operate periodically in a wake-up state (e.g., active mode) where the UE can transmit or receive signals, and periodically in a sleep state (e.g., sleep mode) where the UE's modem remains idle and does not transmit or receive signals, thereby allowing the UE to save power when in sleep mode.

[0072] When either the first UE or the second UE detects a beam failure on the sidelink connection, a sidelink beam failure recovery procedure can be performed to restore the connection between the first UE and the second UE. For example, in some cases, the first UE can use a different transmit beam to transmit a Sideband Signal (SSB) and can receive a Random Access Channel (RACH) message from the second UE in response to the transmitted SSB. The first UE can respond to the RACH message sent by the second UE with a RACH response message to re-establish the sidelink connection.

[0073] However, when each UE operates in DRX mode, the sleep state of DRX mode may interfere with resources used for transmitting beam failure detection reference signals. For example, in some cases, resources used for transmitting beam failure detection reference signals may be unavailable during the sleep state of DRX mode, preventing the UE from transmitting beam failure detection reference signals and thus failing to detect beam failures on the sidelink. Therefore, aspects of this disclosure provide techniques for addressing these problems of beam failure detection when operating in DRX mode. In some cases, these techniques may involve configuring the wake-up state period of DRX mode based on the period of resources used for transmitting multiple beam failure detection reference signals.

[0074] Figure 7 This is a flowchart illustrating an example operation 700 of wireless communication for sidelink DRX and independent sidelink beam failure detection and recovery according to certain aspects of this disclosure. Operation 700 can be performed, for example, by a first sidelink (S1) device (e.g., UE 120a and / or UE 120b in wireless communication network 100). Operation 700 can be implemented in one or more processors (e.g., Figure 2 Software components that execute and run on the controller / processor 280. Furthermore, they can be transmitted, for example, via one or more antennas (e.g., Figure 2 The antenna 252) enables the device in operation 700 to transmit and receive signals. In some aspects, the transmission and / or reception of signals by the device can be achieved via a bus interface of one or more processors (e.g., controller / processor 280) that acquires and / or outputs signals.

[0075] Operation 700 can begin at 702, when operating in Side Link Discontinuous Reception (DRX) mode, to communicate with the second UE on the first communication link between the first UE and the second UE.

[0076] At 704, during the wake-up state of the sidelink DRX mode, the SL device transmits at least one of a plurality of beam failure detection reference signals associated with the first communication link, wherein the period of the wake-up state of the sidelink DRX mode is based on the period used to transmit the plurality of beam failure detection reference signals.

[0077] In 706, the SL device detects that the first communication link between the first UE and the second UE has failed based on at least one beam failure detection reference signal.

[0078] As described above, when operating in sidelink DRX mode, the first UE (e.g., UE 120a) can communicate with the second UE on a first communication link between the first UE and the second UE. In some cases, the first communication link may include a sidelink between the first UE and the second UE. In some cases, communication on the sidelink can be performed according to a resource allocation mode in which the UE can autonomously select sidelink resources (e.g., time and / or frequency resources) for communication without the assistance of the base station, such as independent sidelink resource allocation mode 2. Furthermore, as described above, in some cases, communication using the first communication link (e.g., a sidelink) may involve using one or more beamformed directional beams, such as directional transmit beams and directional receive beams. For example, in some cases, the first UE can use the first transmit beam to send information to the second UE on the first communication link, and the second UE can use the first receive beam to receive the information. In some cases, the first transmit beam and the first receive beam may be referred to as a beampair link.

[0079] In some cases, the first UE and the second UE may be configured with resources for transmitting beam failure detection reference signals, such as sidelink CSI-RS and / or sidelink SSB. In this case, due to potential conflicts between the resources used for transmitting beam failure detection reference signals and the sleep state of the sidelink DRX mode, the period associated with the sidelink DRX mode may be based on the resources used for transmitting beam failure detection reference signals. For example, in some cases, the period of the wake-up state of the sidelink DRX mode may be based on the period used for transmitting multiple beam failure detection reference signals. In other words, for example, the resources used for transmitting beam failure detection reference signals may be aligned with the wake-up state of the sidelink DRX mode to ensure that the UE is awake and able to transmit / receive beam failure detection reference signals during the configured resource period.

[0080] Additionally, in some cases, the period of the wake-up state in DRX mode can be adjusted if the period of the resources used for transmitting and receiving multiple beam failure detection reference signals is adjusted. For example, increasing the period of the resources used for transmitting and receiving multiple beam failure detection reference signals can increase the period of the wake-up state in DRX mode. Similarly, decreasing the period of the resources used for transmitting and receiving multiple beam failure detection reference signals can decrease the period of the wake-up state in DRX mode.

[0081] Therefore, during the wake-up state of the sidelink DRX mode, the first UE can, for example, use the resources configured for transmitting beam failure detection reference signals to transmit at least one of a plurality of beam failure detection reference signals associated with the first communication link.

[0082] Subsequently, in some cases, the first UE can detect that the first communication link between the first UE and the second UE has failed based on at least one beam failure detection reference signal. In some cases, the first UE can detect that the first communication link between the first UE and the second UE has failed based on the fact that the first UE has not received a response message from the second UE in response to at least one beam failure detection reference signal within a threshold time period. In some cases, the response message may include an acknowledgment message.

[0083] In other cases, the first UE may receive a sidelink random access channel (RACH) message from the second UE in response to at least one beam failure detection reference signal (e.g., SSB), and may detect that the first communication link between the first UE and the second UE has failed based on the sidelink RACH message received from the second UE. For example, as described above, the first UE and the second UE may communicate on the sidelink using a first transmit beam (e.g., at the first UE) and a first receive beam (e.g., as at the second UE). Therefore, if the RACH message received from the second UE includes an indication of a transmit beam different from the first transmit beam, the first UE may infer that the first communication link has failed.

[0084] According to some aspects, when the UE receives a RACH message from the second UE, the first UE may subsequently send a sidelink RACH response message to the second UE in response to the sidelink RACH message received from the UE, and at least in part based on the sidelink RACH response message to rebuild the first communication link between the first UE and the second UE.

[0085] In some cases, in response to the detection that the first communication link between the first UE and the second UE has failed (e.g., in some cases, based on the lack of acknowledgment of the beam failure detection reference signal), the first UE may remain in the wake-up state of the sidelink DRX mode. During the wake-up state of the sidelink DRX mode, the first UE may perform a sidelink beam failure recovery procedure to rebuild the first communication link between the first UE and the second UE. For example, in some cases, performing the sidelink beam failure recovery procedure may include transmitting one or more sidelink SSBs. In some cases, the first UE may use multiple different transmit beams to transmit one or more sidelink SSBs.

[0086] Subsequently, the first UE can receive a Sidelink Random Access Channel (RACH) message from the second UE based on one or more sidelink SSBs. In some cases, the sidelink RACH message may include an indication of at least one of a plurality of different transmit beams for transmitting one or more sidelink SSBs. Therefore, the first UE can then send a sidelink RACH response message to the second UE in response to the sidelink RACH message received from the second UE, and at least partially based on the sidelink RACH response message to reconstruct the first communication link between the first UE and the second UE. In some cases, the transmit beam indicated in the RACH message may be used to reconstruct the first communication link.

[0087] Furthermore, while the first UE and the second UE can communicate using a first communication link (e.g., a side link) according to an independent resource allocation mode, in which the UE autonomously selects side link resources for communication without the assistance of the base station, the first UE can also communicate with the base station using a second communication link (e.g., an access link (e.g., a Uu communication link)) between the UE and the base station. In some cases, the UE can operate in a second DRX mode associated with the second communication link (e.g., the access communication link), such as an access DRX mode. In some cases, the access DRX mode may be synchronized with the side link DRX mode. Therefore, during the side link beam failure recovery process, the first UE can remain in the wake-up state of the access DRX mode. In this case, since the first UE is in the wake-up state of the access DRX mode, the first UE may wish to utilize the wake-up state and receive control / data signals from the base station on the second communication link during the wake-up state of the access DRX mode. However, the base station may not be aware that the first UE is in the wake-up state of the access DRX mode because the first UE autonomously handles the side link beam failure recovery process.

[0088] Therefore, if the first UE wishes to communicate (e.g., send or receive) signaling (e.g., control or data signaling) with the base station, the first UE can further send signaling to the base station indicating that the first UE is in a wake-up state of access DRX mode. As mentioned above, the wake-up state of access DRX mode can occur during the period when the first UE is scheduled to be in a sleep state of access DRX mode. However, despite this, based on the sidelink beam failure recovery process, the first UE can be in a wake-up state of access DRX mode during the period when the first UE is scheduled to be in a sleep state of access DRX mode. Therefore, by sending signaling to the base station indicating that the first UE is in a wake-up state of access DRX mode, the first UE can receive at least one data (or control) transmission from the BS on the second communication link in response to the signaling indicating that the first UE is in a wake-up state of access DRX mode.

[0089] In some cases, after the first communication link between the first UE and the second UE has been re-established, the first UE can send a signaling message to the base station indicating that the first UE is in a wake-up state in access DRX mode. In other cases, before the first communication link between the first UE and the second UE has been re-established, the first UE can send a signaling message to the base station indicating that the first UE is in a wake-up state in access DRX mode.

[0090] The techniques performed by the second UE will now be described in various aspects of this disclosure. The techniques described below by the second UE can supplement the techniques described above with respect to the first UE.

[0091] For example, Figure 8 This is a flowchart illustrating an example operation 800 of wireless communication for sidelink DRX and independent sidelink beam failure detection and recovery according to certain aspects of this disclosure. Operation 800 can be performed, for example, by a second SL device (e.g., UE 120a and / or UE 120b in wireless communication network 100). As described above, operation 800 can be considered as supplementary to operation 700 and can be implemented in one or more processors (e.g., Figure 2 Software components that execute and run on the controller / processor 280. Furthermore, they can be transmitted, for example, via one or more antennas (e.g., Figure 2 The antenna 252) enables the device in operation 800 to transmit and receive signals. In some aspects, the transmission and / or reception of signals by the device can be achieved via a bus interface of one or more processors (e.g., controller / processor 280) that acquires and / or outputs signals.

[0092] Operation 800 can begin at 802, during the wake-up state of the sidelink discontinuous reception (DRX) mode, communicating with the first UE on the first communication link between the first UE and the second UE, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for receiving multiple beam failure detection reference signals associated with the first communication link.

[0093] In 804, during the wake-up state of the sidelink DRX mode, the second SL device monitors multiple beam failure detection reference signals according to the period used to receive multiple beam failure detection reference signals.

[0094] According to some aspects, the second UE can monitor at least one beam failure detection reference signal in resources configured for transmitting beam failure detection reference signals, which can be consistent with the wake-up state of the sidelink DRX mode as described above. For example, in some cases, the second UE can receive at least one of a plurality of beam failure detection reference signals from the first UE based on this monitoring. According to some aspects, at least one beam failure detection reference signal can be received in the wake-up state of the sidelink DRX mode in resources configured for transmitting beam failure detection reference signals. Thereafter, the second UE can send a response message to the first UE in response to the at least one beam failure detection reference signal. In this case, since the second UE is able to receive at least one beam failure detection signal from the first UE, the first communication link has not failed.

[0095] In other cases, the second UE can detect that the first communication link between the first UE and the second UE has failed based on this monitoring (e.g., based on the second UE not receiving at least one beam failure detection signal from the first UE), and can perform a beam failure recovery procedure to rebuild the first communication link between the first UE and the second UE. Similar to the first UE, the second UE can remain in a wake-up state in sidelink DRX mode during the beam failure recovery procedure.

[0096] In some cases, performing a beam failure recovery procedure may include receiving one or more sidelink synchronization signal blocks (SSBs) from the first UE based on the detection that a first communication link between the first UE and the second UE has failed. Subsequently, the second UE may send a sidelink random access channel (RACH) message to the first UE in response to the received sidelink SSBs. In some cases, as described above, the RACH message may include an indication of the transmit beam used by the first UE to transmit the one or more sidelink SSBs. Subsequently, the second UE may receive a sidelink RACH response message from the first UE based on the sidelink RACH message sent to the first UE, and may rebuild the first communication link between the first UE and the second UE based on the sidelink RACH response message. In some cases, the transmit beam indicated in the RACH message may be used to rebuild the first communication link.

[0097] Furthermore, similar to the first UE, since the second UE remains in the wake-up state of the access DRX mode associated with the second communication link between the second UE and the BS during the beam failure recovery process, the second UE can utilize the wake-up state of the access DRX mode by communicating with the BS during this period. For example, in some cases, the second UE can send a signaling to the BS indicating that the second UE is in the wake-up state of the access DRX mode. It should be noted that the wake-up state of the access DRX mode can occur during the period when the second UE is scheduled to be in the sleep state of the access DRX mode. However, based on the sidelink beam failure recovery process, the second UE can still be in the wake-up state of the access DRX mode during the period when the second UE is scheduled to be in the sleep state of the access DRX mode. Therefore, by sending a signaling to the base station indicating that the second UE is in the wake-up state of the access DRX mode, the second UE can receive at least one data (or control) transmission from the BS on the second communication link in response to the signaling indicating that the first UE is in the access wake-up state.

[0098] In some cases, after the first communication link between the first UE and the second UE has been re-established, the second UE can send a signaling message to the base station indicating that the second UE is in a wake-up state in access DRX mode. In other cases, before the first communication link between the first UE and the second UE has been re-established, the second UE can send a signaling message to the base station indicating that the second UE is in a wake-up state in access DRX mode.

[0099] Example wireless communication device

[0100] Figure 9 An example communication device 900 is depicted, which includes various components that are operable, configurable, or adapted to perform the operations of the techniques disclosed herein, such as regarding Figure 7 The operation of depicting and describing. In some examples, the communication device 900 may be, for example, about Figure 1 , Figure 2 Figure 4 and Figure 5 The user equipment described are 120a, 202, 452, and 502.

[0101] The communication device 900 includes a processing system 902 coupled to a transceiver 908 (e.g., a transmitter and / or receiver). The transceiver 908 is configured to transmit (or transmit) and receive signals, such as the various signals described herein, for the communication device 900 via an antenna 910. The processing system 902 may be configured to perform processing functions for the communication device 900, including processing signals received and / or to be transmitted by the communication device 900.

[0102] Processing system 902 includes one or more processors 920 coupled to computer-readable medium / memory 930 via bus 906. In some aspects, computer-readable medium / memory 930 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 920, cause the one or more processors 920 to perform... Figure 7 The illustrated operations, or other operations, can be performed using the various techniques discussed here for sidelink DRX and independent sidelink beam failure detection and recovery.

[0103] In the illustrated example, the computer-readable medium / memory 930 stores code 931 for communication, code 932 for transmission, code 933 for detection, encoding 934 for reception, code 935 for reconstruction, code 936 for execution, code 937 for determination, and code 938 for adjustment.

[0104] In the depicted example, one or more processors 920 include circuitry configured to implement code stored in computer-readable medium / memory 930, including circuitry 921 for communication, circuitry 922 for transmission, circuitry 923 for detection, circuitry 924 for reception, circuitry 925 for reconstruction, circuitry 926 for execution, circuitry 927 for determination, and circuitry 928 for adjustment.

[0105] The various components of the communication device 900 can provide for performing the functions described herein, including those related to... Figure 7 The components of the method.

[0106] In some examples, components for sending or transmitting (or components for outputting for transmission) and components for communication may include Figure 2 The user equipment 104 shown in the figure includes a transceiver 254 and / or (multiple) antennas 252 and / or Figure 9 The transceiver 908 and antenna 910 of the communication device 910.

[0107] In some examples, the components for receiving (or for acquiring) and the components for communication may include Figure 2 The transceiver 254 and / or (multiple) antennas 252 and / or... of the user equipment 202 shown in the figure Figure 9 The transceiver 908 and antenna 910 of the communication device 910.

[0108] In some examples, the components for detection, determination, reconstruction, execution, and adjustment can include various processing system components, such as: Figure 9 One or more of the 920 processors, or Figure 2The user equipment 202 depicted includes a receive processor 258, a transmit processor 264, a TX MIMO processor 266, and / or a controller / processor 280 (including a sidelink BFR module 281).

[0109] It is worth noting that, Figure 9 This is just one example, and many other examples and configurations of the communication device 900 are possible.

[0110] Figure 10 An example communication device 1000 is depicted, which includes various components that are operable, configurable, or adapted to perform the operations of the techniques disclosed herein, such as those relating to... Figure 8 The operation of depicting and describing. In some examples, the communication device 1000 may be, for example, about Figure 1 , Figure 2 Figure 4 and Figure 5 The user equipment described are 120a, 202, 454, and 504.

[0111] Communication device 1000 includes a processing system 1002 coupled to a transceiver 1008 (e.g., a transmitter and / or receiver). Transceiver 1008 is configured to transmit (or transmit) and receive signals, such as the various signals described herein, for communication device 1000 via antenna 1010. Processing system 1002 may be configured to perform processing functions for communication device 1000, including processing signals received and / or to be transmitted by communication device 1000.

[0112] Processing system 1002 includes one or more processors 1020 coupled to computer-readable medium / memory 1030 via bus 1006. In some aspects, computer-readable medium / memory 1030 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 1020, cause the one or more processors 1020 to perform... Figure 8 The illustrated operations, or other operations used to perform the various techniques discussed in this paper for sidelink DRX and independent sidelink beam failure detection and recovery.

[0113] In the illustrated example, computer-readable medium / memory 1030 stores code 1031 for communication, code 1032 for monitoring, code 1033 for receiving, code 1034 for sending, code 1035 for detection, code 1036 for execution, code 1037 for reconstruction, code 1038 for determination, and code 1039 for adjustment.

[0114] In the depicted example, one or more processors 1020 include circuitry configured to implement code stored in computer-readable medium / memory 1030, including circuitry 1021 for communication, circuitry 1022 for monitoring, circuitry 1023 for receiving, circuitry 1024 for transmitting, circuitry 1025 for detection, circuitry 1026 for execution, circuitry 1027 for reconstruction, circuitry 1028 for determination, and circuitry 1029 for adjustment.

[0115] The various components of the communication device 1000 can provide for performing tasks including those related to... Figure 8 The components of the method described in this article.

[0116] In some examples, components for sending, for communication or transmission (or for output for transmission) may include Figure 2 The transceiver 254 and / or (multiple) antennas 252 and / or... (The diagram shows) the user equipment 104. Figure 10 The transceiver 1008 and antenna 1010 of the communication device 1000.

[0117] In some examples, the components for receiving (or for acquiring) and the components for communication may include Figure 2 The transceiver 254 and / or (multiple) antennas 252 of the user equipment 104 shown in the figure, and / or Figure 10 The transceiver 1008 and antenna 1010 of the communication device 1000.

[0118] In some examples, the components for execution, reconstruction, monitoring, detection, adjustment, and determination can include various processing system components, such as: Figure 10 One or more processors 1020, or Figure 2 The user equipment 104 depicted includes various aspects such as a receive processor 258, a transmit processor 264, a TX MIMO processor 266, and / or a controller / processor 280 (including a sidelink BFR module 281).

[0119] It is worth noting that, Figure 10 This is just one example, and many other examples and configurations of the communication device 1000 are possible.

[0120] Example Terms

[0121] Implementation examples are described in the following numbered clauses:

[0122] Clause 1: A method for wireless communication performed by a first user equipment (UE), comprising: communicating with a second UE on a first communication link between the first UE and the second UE while operating in a sidelink discontinuous reception (DRX) mode; during a wake-up state of the sidelink DRX mode, transmitting at least one of a plurality of beam failure detection reference signals associated with the first communication link, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals; and detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal.

[0123] Clause 2: The method according to Clause 1, wherein the plurality of beam failure detection reference signals includes at least one of the following: a sidelink channel state information reference signal (CSI-RS); or a sidelink synchronization signal block (SSB).

[0124] Clause 3: The method according to any one of Clauses 1-2, wherein detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal comprises: not receiving a response message in response to the at least one beam failure detection reference signal from the second UE within a threshold time period; and detecting that the first communication link between the first UE and the second UE has failed further based on not receiving a response message from the second UE within the threshold time period.

[0125] Clause 4: The method according to any one of Clauses 1-2, wherein detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal comprises: receiving a sidelink random access channel (RACH) message from the second UE in response to the at least one beam failure detection reference signal; and detecting that the first communication link between the first UE and the second UE has failed further based on the sidelink RACH message received from the second UE.

[0126] Clause 5: The method according to Clause 4, wherein the sidelink RACH message indicates a transmission beam different from the transmission beam associated with the first communication link.

[0127] Clause 6: The method according to any one of Clauses 4-5, wherein the at least one beam failure detection reference signal includes at least one side link synchronization signal block (SSB).

[0128] Clause 7: The method according to any one of Clauses 4-5 further includes: sending a sidelink RACH response message to the second UE in response to the sidelink RACH message received from the UE; and reconstructing the first communication link between the first UE and the second UE based at least in part on the sidelink RACH response message.

[0129] Clause 8: The method according to any one of Clauses 1-7 further includes maintaining the wake-up state of the side link DRX mode in response to detecting that the first communication link between the first UE and the second UE has failed.

[0130] Clause 9: The method described in Clause 8 further includes performing a sidelink beam failure recovery procedure during the wake-up state of the sidelink DRX mode to rebuild the first communication link between the first UE and the second UE.

[0131] Clause 10: The method according to Clause 9, wherein performing the sidelink beam failure recovery procedure includes: sending one or more sidelink synchronization signal blocks (SSBs); receiving a sidelink random access channel (RACH) message from the second UE based on the one or more sidelink SSBs; sending a sidelink RACH response message to the second UE in response to the sidelink RACH message received from the second UE; and reconstructing a first communication link between the first UE and the second UE based at least in part on the sidelink RACH response message.

[0132] Clause 11: The method according to Clause 10, wherein: transmitting one or more sidelink SSBs includes transmitting one or more sidelink SSBs using a plurality of different transmit beams; and the sidelink RACH message includes an indication of at least one of the plurality of different transmit beams.

[0133] Clause 12: The method according to any one of Clauses 10-11 further includes: communicating with the BS on a second communication link between the first UE and the base station (BS); sending to the BS a signaling indicating that the first UE is in a wake-up state of an access DRX mode associated with the second communication link; and receiving at least one data transmission from the BS in response to the signaling indicating that the first UE is in a wake-up state of an access DRX mode associated with the second communication link.

[0134] Clause 13: The method according to Clause 12, wherein: the wake-up state of access DRX mode occurs during the time period when the first UE is scheduled to be in the sleep state of access DRX mode; and based on the sidelink beam failure recovery process, the UE is in the wake-up state of access DRX mode during the time period when the first UE is scheduled to be in the sleep state of access DRX mode.

[0135] Clause 14: The method according to any one of Clauses 12-13, wherein sending signaling to the BS indicating that the first UE is in a wake-up state of access DRX mode comprises: after the first communication link between the first UE and the second UE has been re-established, sending signaling to the base station indicating that the first UE is in a wake-up state of access DRX mode.

[0136] Clause 15: The method according to any one of Clauses 1-14, wherein the first communication link includes a side link between the first UE and the second UE.

[0137] Clause 16: The method according to any one of Clauses 1-15 further includes: determining a change in the period for transmitting multiple beam failure detection reference signals; and adjusting at least one of the period of the wake-up state of the sidelink DRX mode or the period of the sleep state of the sidelink DRX mode based on the determined change in the period for transmitting multiple beam failure detection reference signals.

[0138] Clause 17: The method according to Clause 16, wherein: the determined change increases the period for transmitting multiple beam failure detection reference signals; and adjusting at least one of the period of the wake-up state of the sidelink DRX mode or the period of the sleep state of the sidelink DRX mode includes increasing at least one of the period of the wake-up state of the sidelink DRX mode or increasing at least one of the period of the sleep state of the sidelink DRX mode.

[0139] Clause 18: The method according to Clause 16, wherein: the determined change reduces the period used for transmitting multiple beam failure detection reference signals; and adjusting at least one of the period of the wake-up state of the sidelink DRX mode or the period of the sleep state of the sidelink DRX mode includes reducing at least one of the period of the wake-up state of the sidelink DRX mode or reducing the period of the sleep state of the sidelink DRX mode.

[0140] Clause 19: A method for wireless communication performed by a second user equipment (UE), comprising: communicating with a first UE on a first communication link between a first UE and a second UE during a wake-up state in a sidelink discontinuous reception (DRX) mode, wherein the period of the wake-up state in the sidelink DRX mode is based on a period for receiving a plurality of beam failure detection reference signals associated with the first communication link; and monitoring a plurality of beam failure detection reference signals according to the period for receiving the plurality of beam failure detection reference signals during the wake-up state in the sidelink DRX mode.

[0141] Clause 20: The method according to Clause 19 further includes: receiving, based on the monitoring, at least one of a plurality of beam failure detection reference signals from the first UE; and sending a response message to the first UE in response to the at least one beam failure detection reference signal.

[0142] Clause 21: The method according to any one of Clauses 19-20 further includes: detecting, based on the monitoring, that a first communication link between the first UE and the second UE has failed; and performing a side link beam failure recovery process to rebuild the first communication link between the first UE and the second UE.

[0143] Clause 22: The method according to Clause 21, wherein performing the sidelink beam failure recovery procedure includes maintaining a wake-up state in the sidelink DRX mode.

[0144] Clause 23: The method according to Clause 22, wherein performing the sidelink beam failure recovery process further includes: receiving one or more sidelink synchronization signal blocks (SSBs) from the first UE based on the detection that the first communication link between the first UE and the second UE has failed; and sending a sidelink random access channel (RACH) message to the first UE in response to the received one or more sidelink SSBs.

[0145] Clause 24: The method according to Clause 23, wherein performing the sidelink beam failure recovery process further includes: receiving a sidelink RACH response message from the first UE based on the sidelink RACH message sent to the first UE; and reconstructing the first communication link between the first UE and the second UE based on the sidelink RACH response message.

[0146] Clause 25: The method according to Clause 24 further includes: communicating with the BS on a second communication link between the second UE and the base station (BS); sending a signaling to the BS indicating that the second UE is in a wake-up state of an access DRX mode associated with the second communication link; and receiving at least one data transmission from the BS in response to the signaling indicating that the second UE is in a wake-up state of an access DRX mode associated with the second communication link.

[0147] Clause 26: The method according to Clause 25, wherein: the wake-up state of the access DRX mode occurs during the time period when the second UE is scheduled to be in the sleep state of the access DRX mode; and based on the sidelink beam failure recovery process, the second UE is in the wake-up state of the access DRX mode during the time period when the second UE is scheduled to be in the sleep state of the access DRX mode.

[0148] Clause 27: The method according to any one of Clauses 25-26, wherein sending signaling to the BS indicating that the second UE is in a wake-up state of access DRX mode comprises: after the first communication link between the first UE and the second UE has been re-established, sending signaling to the BS indicating that the second UE is in a wake-up state of access DRX mode.

[0149] Clause 28: The method according to any one of Clauses 19-27, wherein the first communication link includes a side link between the first UE and the second UE.

[0150] Clause 29: The method according to any one of Clauses 19-28 further includes: determining a change in the period for transmitting multiple beam failure detection reference signals; and adjusting at least one of the period of the wake-up state of the sidelink DRX mode or the period of the sleep state of the sidelink DRX mode based on the determined change in the period for transmitting multiple beam failure detection reference signals.

[0151] Clause 30: The method according to Clause 29, wherein: the determined change increases the period for transmitting multiple beam failure detection reference signals; and adjusting at least one of the period of the wake-up state of the sidelink DRX mode or the period of the sleep state of the sidelink DRX mode includes increasing at least one of the period of the wake-up state of the sidelink DRX mode or increasing the period of the sleep state of the sidelink DRX mode.

[0152] Clause 31: The method according to Clause 29, wherein: the determined change reduces the period used for transmitting multiple beam failure detection reference signals; and adjusting at least one of the period of the wake-up state of the sidelink DRX mode or the period of the sleep state of the sidelink DRX mode includes reducing at least one of the period of the wake-up state of the sidelink DRX mode or reducing the period of the sleep state of the sidelink DRX mode.

[0153] Clause 32: An apparatus for wireless communication, comprising: a memory including executable instructions; and one or more processors configured to execute the executable instructions and cause the apparatus to perform the method according to any one of Clauses 1-31.

[0154] Clause 33: An apparatus for wireless communication, comprising components for performing the method according to any one of Clauses 1-31.

[0155] Clause 34: A non-transitory computer-readable medium for wireless communication, comprising executable instructions that, when executed by one or more processors of a device, cause the device to perform a method according to any one of Clauses 1-31.

[0156] Clause 35: A computer program product for wireless communication embodied on a computer-readable storage medium, comprising code for performing a method according to any one of Clauses 1-31.

[0157] Other precautions

[0158] The techniques described in this article can be used in various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. CDMA networks can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and cdma2000. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers the IS-2000, IS-95, and IS-856 standards. TDMA networks can implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are UMTS versions using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization called 3rd Generation Partnership Project 2 (3GPP 2). NR is an emerging wireless communication technology under development.

[0159] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or the NB subsystem serving that coverage area, depending on the context in which the term is used. In NR systems, the term "cell" is used interchangeably with BS, Next Generation Node B (gNB or gNodeB), Access Point (AP), Distributed Unit (DU), and Carrier or Transmitter / Receiver Point (TRP). A BS can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access for UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access for UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a home) and can allow restricted access for UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in a home, etc.). A BS for a macrocell can be called a macro BS. A BS for a picocell can be called a pico BS. A BS for a femtocell can be called a femto BS or a home BS.

[0160] A UE can also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, client equipment (CPE), cellular phone, smartphone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical apparatus, biosensor / device, wearable devices such as smartwatches, smart clothes, smart glasses, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets, etc.), entertainment devices (e.g., music devices, video devices, satellite radios, etc.), vehicle components or sensors, smart meters / sensors, industrial manufacturing equipment, GPS devices, or any other suitable device configured to communicate via wireless or wired media. Some UEs can be considered machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, instruments, monitors, location tags, etc., which can communicate with the BS, another device (e.g., a remote device), or other entities. For example, a wireless node can provide connectivity to or to a network (e.g., a wide area network such as the Internet or cellular networks) via wired or wireless communication links. Some UEs can be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0161] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., a BS) allocates resources for communication between some or all devices and apparatuses within its service area or cell. The scheduling entity can be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, the subordinate entity utilizes the resources allocated by the scheduling entity. A base station is not the only entity that can act as a scheduling entity. In some examples, a UE can act as a scheduling entity and can schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs can utilize the resources scheduled by that UE for wireless communication. In some examples, a UE can act as a scheduling entity in peer-to-peer (P2P) networks and / or mesh networks. In the mesh network example, in addition to communicating with a scheduling entity, UEs can also communicate directly with each other.

[0162] The methods disclosed herein include one or more steps or actions for implementing the method. The method steps and / or actions may be interchanged without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of a particular step and / or action may be modified without departing from the scope of the claims.

[0163] As used herein, the phrase “at least one of a series of items” refers to any combination of those items, including a single member. As an example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0164] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" can include calculation, operation, processing, derivation, investigation, searching (e.g., looking in a table, database, or other data structure), ascertainment, etc. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), etc. Additionally, "determine" can include parsing, selecting, picking, building, etc.

[0165] The foregoing description is provided to enable those skilled in the art to practice the various aspects described herein. Various modifications to these aspects will readily be apparent to those skilled in the art, and the general 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 consistent with the full scope of the language of the claims, wherein, unless specifically stated otherwise, reference to elements in the singular form is not intended to mean “one and only one,” but rather “one or more.” Unless otherwise specifically stated, the term “some” means one or more. All structural and functional equivalents of elements of the various aspects described in this disclosure that are known to or will be known hereafter by 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 to be offered to the public, whether or not such disclosure is expressly stated in the claims. No element of any claim shall be interpreted under 35 U.SC 112(f) unless the element is expressly stated using the phrase “component for…” or, in the case of a method claim, using the phrase “step for…”.

[0166] The various operations described above can be performed by any suitable component capable of performing the corresponding function. This component may include various hardware(s) and / or software components and / or modules(s), including but not limited to circuits, application-specific integrated circuits (ASICs), or processors. Typically, in cases where operations are illustrated in the figures, those operations may have corresponding devices plus functional components with similar numbering.

[0167] The various illustrative logic blocks, modules, and circuits described in this disclosure may be implemented or performed using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, it may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0168] If implemented in hardware, an example hardware configuration could include a processing system in a wireless node. This processing system could be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus could include any number of interconnect buses and bridges. The bus can link various circuits together, including processors, machine-readable media, and bus interfaces. The bus interface can be used to connect network adapters, etc., to the processing system via the bus. The network adapter can be used to implement signal processing functions at the PHY layer. In the case of a user terminal (see...),... Figure 1 User interfaces (e.g., keyboard, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and will not be described further. The processor can be implemented using one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits capable of executing software. Those skilled in the art will recognize how best to implement the functions of the processing system, depending on the specific application and the overall design constraints imposed on the system as a whole.

[0169] If implemented in software, these functions can be stored or transmitted as one or more instructions or code on a computer-readable medium. Software should be interpreted broadly as representing instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or others. Computer-readable media includes both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on the machine-readable storage medium. The computer-readable storage medium may be coupled to the processor, allowing the processor to read information from and write information to the storage medium. Alternatively, the storage medium may be integrated with the processor. For example, machine-readable media may include transmission lines, data-modulated carrier waves, and / or computer-readable storage media containing instructions separate from the wireless node, all accessible to the processor via a bus interface. Alternatively or additionally, the machine-readable medium, or any portion thereof, may be integrated into the processor, such as in the case of caches and / or general-purpose register files. Examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), registers, disks, optical disks, hard disks, or any other suitable storage media, or any combination thereof. Machine-readable media may be contained in a computer program product.

[0170] Software modules can include single or multiple instructions and can be distributed across several different code segments, within different programs, and across multiple storage media. Computer-readable media can include multiple software modules. Software modules include instructions that, when executed by a device such as a processor, cause the processing system to perform various functions. Software modules can include transfer modules and receive modules. Each software module can reside in a single storage device or be distributed across multiple storage devices. For example, when a triggering event occurs, a software module can be loaded from a hard disk into RAM. During the execution of a software module, the processor can load some instructions into a cache to improve access speed. Then, one or more cache lines can be loaded into a general-purpose register file for the processor to execute. As will be understood when the functionality of a software module is mentioned below, this functionality is implemented by the processor when executing instructions from that software module.

[0171] Similarly, any connection is properly referred to as computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared (IR), radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are also included in the definition of medium. Disks and optical discs as used herein include compact optical discs (CDs), laser discs, optical discs, digital versatile optical discs (DVDs), floppy disks, and... Optical discs, where magnetic disks typically reproduce data magnetically, and optical discs reproduce data optically using lasers. Therefore, in some aspects, computer-readable media can include non-transitory computer-readable media (e.g., tangible media). Furthermore, in other aspects, computer-readable media can include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0172] Therefore, certain aspects may include a computer program product for performing the operations described herein. For example, such a computer program product may include a computer-readable medium having instructions stored thereon (and / or encoded thereon) that can be executed by one or more processors to perform the operations described herein, such as, for performing the operations described herein. Figure 7 and / or Figure 8 The operations shown herein, as well as the instructions described herein for sidelink DRX and independent sidelink beam failure detection and recovery, are also included.

[0173] Furthermore, it should be understood that modules and / or other suitable components for performing the methods and techniques described herein may be downloaded and / or otherwise obtained by the user terminal and / or base station, if applicable. For example, such a device may be coupled to a server to facilitate the transfer of components for performing the methods described herein. Alternatively, the various methods described herein may be provided by storage components (e.g., RAM, ROM, physical storage media such as CDs or floppy disks), such that the user terminal and / or base station can obtain the various methods when the storage components are coupled to or provided to the device. Furthermore, any other suitable techniques for providing the methods and techniques described herein to the device may be utilized.

[0174] It will be understood that the claims are not limited to the precise configuration and components described above. Various modifications, alterations, and changes may be made to the arrangement, operation, and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication performed by a first user equipment (UE), comprising: When operating in DRX mode with discontinuous side link reception, the first UE communicates with the second UE on a first communication link between the first UE and the second UE, wherein the first communication link includes the side link between the first UE and the second UE. During the wake-up state of the sidelink DRX mode, at least one of a plurality of beam failure detection reference signals associated with the first communication link is transmitted, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals. and The first communication link between the first UE and the second UE is detected to have failed based on the at least one beam failure detection reference signal, and a side link beam failure recovery process is performed. The method further includes: The UE communicates with the base station (BS) on a second communication link between the first UE and the BS, wherein, based on the sidelink beam failure recovery process, during the time period when the first UE is scheduled to be in a sleep state of the access DRX mode associated with the second communication link, the first UE is in a wake-up state of the access DRX mode; and Send a signaling message to the BS indicating that the first UE is in the wake-up state of the access DRX mode associated with the second communication link.

2. The method according to claim 1, further comprising: In response to detecting that the first communication link between the first UE and the second UE has failed, the system remains in the wake-up state of the side link DRX mode; and During the wake-up state of the sidelink DRX mode, the sidelink beam failure recovery process is performed to rebuild the first communication link between the first UE and the second UE.

3. The method according to claim 2, wherein, The side link beam failure recovery process includes: Send one or more Side Link Synchronization Signal Blocks (SSBs); Based on the one or more sidelink SSBs, receive sidelink random access channel (RACH) messages from the second UE; In response to the sidelink RACH message received from the second UE, a sidelink RACH response message is sent to the second UE; and The first communication link is rebuilt between the first UE and the second UE, at least in part, based on the sidelink RACH response message.

4. The method according to claim 3, wherein: Transmitting the one or more sidelink SSBs includes using multiple different transmit beams to transmit the one or more sidelink SSBs; and The sidelink RACH message includes an indication of at least one of the plurality of different transmit beams.

5. The method of claim 1, further comprising: In response to a signaling indicating that the first UE is in the wake-up state of the access DRX mode associated with the second communication link, at least one data transmission is received from the BS.

6. The method according to claim 5, wherein, Sending signaling to the BS indicating that the first UE is in the wake-up state of the access DRX mode includes: after the first communication link between the first UE and the second UE has been re-established, sending signaling to the base station indicating that the first UE is in the wake-up state of the access DRX mode.

7. The method according to claim 1, wherein, The plurality of beam failure detection reference signals include at least one of the following: Sidelink Channel State Information Reference Signal (CSI-RS); or Side link synchronization signal block (SSB).

8. The method according to claim 1, wherein, Detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal includes: During the threshold time period, no response message in response to the at least one beam failure detection reference signal was received from the second UE; and The detection further establishes that the first communication link between the first UE and the second UE has failed, based on the fact that no response message has been received from the second UE within the threshold time period.

9. The method according to claim 1, wherein, Detecting that the first communication link between the first UE and the second UE has failed based on the at least one beam failure detection reference signal includes: In response to the at least one beam failure detection reference signal, a sidelink random access channel (RACH) message is received from the second UE; and The detection that the first communication link between the first UE and the second UE has failed is further based on the side link RACH message received from the second UE.

10. The method according to claim 9, wherein, The sidelink RACH message indicates a transmission beam that is different from the transmission beam associated with the first communication link.

11. The method according to claim 9, wherein, The at least one beam failure detection reference signal includes at least one side link synchronization signal block (SSB).

12. The method of claim 9, further comprising: In response to the sidelink RACH message received from the second UE, a sidelink RACH response message is sent to the second UE; and The first communication link is rebuilt between the first UE and the second UE, at least in part, based on the sidelink RACH response message.

13. The method of claim 1, further comprising: Determine the change in the period used to transmit the multiple beam failure detection reference signals; and Based on the determined change in the period used to transmit the plurality of beam failure detection reference signals, adjust at least one of the period of the wake-up state of the side link DRX mode or the period of the sleep state of the side link DRX mode.

14. The method of claim 13, wherein: The determined change increases the period used to transmit the multiple beam failure detection reference signals; and Adjusting at least one of the wake-up period of the sidelink DRX mode or the sleep period of the sidelink DRX mode includes increasing at least one of the wake-up period of the sidelink DRX mode or increasing the sleep period of the sidelink DRX mode.

15. The method according to claim 13, wherein: The determined change reduces the period used to transmit the multiple beam failure detection reference signals; and Adjusting at least one of the wake-up period of the sidelink DRX mode or the sleep period of the sidelink DRX mode includes reducing at least one of the wake-up period of the sidelink DRX mode or the sleep period of the sidelink DRX mode.

16. A method for wireless communication performed by a second user equipment (UE), comprising: During the wake-up state of the sidelink discontinuous reception DRX mode, communication is performed with the first UE on the first communication link between the first UE and the second UE, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for receiving multiple beam failure detection reference signals associated with the first communication link, wherein the first communication link includes the sidelink between the first UE and the second UE. During the wake-up state of the sidelink DRX mode, the plurality of beam failure detection reference signals are monitored according to the period for receiving the plurality of beam failure detection reference signals; as well as When the first communication link is detected to have failed, a side link beam failure recovery process is executed. The method further includes: The second UE communicates with the base station BS on a second communication link, wherein, based on the sidelink beam failure recovery process, during the time period when the second UE is scheduled to be in a sleep state of the access DRX mode associated with the second communication link, the second UE is in a wake-up state of the access DRX mode; and Send a signaling message to the BS indicating that the second UE is in the wake-up state of the access DRX mode associated with the second communication link.

17. The method of claim 16, further comprising: Based on the monitoring, at least one beam failure detection reference signal is received from the first UE among the plurality of beam failure detection reference signals; and In response to the at least one beam failure detection reference signal, a response message is sent to the first UE.

18. The method of claim 17, further comprising: The failure of the first communication link between the first UE and the second UE is detected based on the at least one beam failure detection reference signal. and The sidelink beam failure recovery procedure is executed to rebuild the first communication link between the first UE and the second UE.

19. The method of claim 16, wherein, Performing the sidelink beam failure recovery process includes remaining in the wake-up state of the sidelink DRX mode.

20. The method according to claim 19, wherein, The side link beam failure recovery process further includes: Based on the detection that the first communication link between the first UE and the second UE has failed, one or more Side Link Synchronization Signal Blocks (SSBs) are received from the first UE; and In response to one or more sidelink SSBs received, a sidelink random access channel (RACH) message is sent to the first UE.

21. The method according to claim 20, wherein, The side link beam failure recovery process further includes: Based on the sidelink RACH message sent to the first UE, a sidelink RACH response message is received from the first UE; and Based on the sidelink RACH response message, the first communication link between the first UE and the second UE is rebuilt.

22. The method of claim 16, further comprising: In response to a signaling indicating that the second UE is in the wake-up state of the access DRX mode associated with the second communication link, at least one data transmission is received from the BS.

23. The method according to claim 22, wherein, Sending signaling to the BS indicating that the second UE is in the wake-up state of the access DRX mode includes: after the first communication link between the first UE and the second UE has been re-established, sending signaling to the BS indicating that the second UE is in the wake-up state of the access DRX mode.

24. The method of claim 16, further comprising: Determine the change in the period used to transmit the multiple beam failure detection reference signals; and Based on the determined change in the period used to transmit the plurality of beam failure detection reference signals, adjust at least one of the period of the wake-up state of the side link DRX mode or the period of the sleep state of the side link DRX mode.

25. The method of claim 24, wherein: The determined change increases the period used to transmit the multiple beam failure detection reference signals; and Adjusting at least one of the wake-up period of the sidelink DRX mode or the sleep period of the sidelink DRX mode includes increasing at least one of the wake-up period of the sidelink DRX mode or increasing the sleep period of the sidelink DRX mode.

26. The method of claim 24, wherein: The determined change reduces the period used to transmit the multiple beam failure detection reference signals; and Adjusting at least one of the wake-up period of the sidelink DRX mode or the sleep period of the sidelink DRX mode includes reducing at least one of the wake-up period of the sidelink DRX mode or the sleep period of the sidelink DRX mode.

27. An apparatus for wireless communication by a first user equipment (UE), comprising: Memory, including executable instructions; and One or more processors are configured to execute the executable instructions and enable the device: When operating in DRX mode with discontinuous side link reception, the first UE communicates with the second UE on a first communication link between the first UE and the second UE, wherein the first communication link includes the side link between the first UE and the second UE. During the wake-up state of the sidelink DRX mode, at least one of a plurality of beam failure detection reference signals associated with the first communication link is transmitted, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for transmitting the plurality of beam failure detection reference signals. and Based on the at least one beam failure detection reference signal, the failure of the first communication link between the first UE and the second UE is detected, and a side link beam failure recovery process is performed. The one or more processors are further configured to cause the device to: The UE communicates with the BS on the second communication link between the first UE and the base station BS, wherein, based on the side link beam failure recovery process, the first UE is in the wake-up state of the access DRX mode during the time period when the first UE is scheduled to be in a sleep state of the access DRX mode associated with the second communication link. as well as Send a signaling message to the BS indicating that the first UE is in the wake-up state of the access DRX mode associated with the second communication link.

28. An apparatus for wireless communication by a second user equipment (UE), comprising: Memory, including executable instructions; and One or more processors are configured to execute the executable instructions and enable the device to: During the wake-up state of the sidelink discontinuous reception DRX mode, communication is performed with the first UE on the first communication link between the first UE and the second UE, wherein the period of the wake-up state of the sidelink DRX mode is based on the period for receiving multiple beam failure detection reference signals associated with the first communication link, wherein the first communication link includes the sidelink between the first UE and the second UE. During the wake-up state of the sidelink DRX mode, the plurality of beam failure detection reference signals are monitored according to the period for receiving the plurality of beam failure detection reference signals; as well as When the first communication link is detected to have failed, a side link beam failure recovery process is executed. The one or more processors are further configured to cause the device to: The second UE communicates with the base station BS on a second communication link, wherein, based on the sidelink beam failure recovery process, during the time period when the second UE is scheduled to be in a sleep state of the access DRX mode associated with the second communication link, the second UE is in a wake-up state of the access DRX mode; and Send a signaling message to the BS indicating that the second UE is in the wake-up state of the access DRX mode associated with the second communication link.

29. An apparatus for wireless communication, comprising components for performing the steps of the method as claimed in any one of claims 1-26.

30. A non-transitory computer-readable medium comprising executable instructions that, when executed by a processor, cause the processor to perform the method as claimed in any one of claims 1-26.

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