Coordinated signaling for sidelink resource selection

Abstract

Various aspects of the disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) can select a sidelink resource for inter-UE coordination signaling with a second UE. The UE can transmit, from the first UE to the second UE via a sidelink interface, an inter-UE coordination signal using the sidelink resource. Numerous other aspects are provided.

Description

[0001] Cross-reference to related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 706,301, filed August 7, 2020, entitled “COORDINATION SIGNALING FOR SIDELINK RESOURCE SELECTION”, and U.S. Non-Provisional Patent Application No. 17 / 444,449, filed August 4, 2021, entitled “COORDINATION SIGNALING FOR SIDELINK RESOURCE SELECTION”, which are expressly incorporated herein by reference. Technical Field

[0003] Various aspects of this disclosure relate generally to wireless communications, and specifically to techniques and apparatus for coordination signaling for sidelink resource selection. Background Technology

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

[0005] A wireless network may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). UEs can communicate with the BS via downlinks and uplinks. A "downlink" (or "forward link") refers to the communication link from the BS to the UE, and an "uplink" (or "backlink") refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Headend, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] The aforementioned multiple access technologies have been adopted in various telecommunications standards to provide a common protocol enabling different user equipment to communicate at the city, country, region, and even global levels. NR, also known as 5G, is a set of enhancements to the LTE mobile standard released by 3GPP. NR aims 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. These open standards use Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL) (CP-OFDM), and use CP-OFDM and / or SC-FDM (e.g., also known as Discrete Fourier Transform Spread Spectrum OFDM (DFT-s-OFDM)) on the uplink (UL), and support beamforming, multiple-input multiple-output (MIMO) antenna technologies, and carrier aggregation. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to grow. Summary of the Invention

[0007] In some aspects, a wireless communication method performed by a first user equipment (UE) includes: selecting sidelink resources for inter-UE coordination signaling with a second UE; and using the sidelink resources, transmitting inter-UE coordination signals from the first UE to the second UE via a sidelink interface.

[0008] In some aspects, a first UE for wireless communication includes a memory and one or more processors coupled to the memory, the one or more processors being configured to: select sidelink resources for inter-UE coordination signaling with a second UE; and use the sidelink resources to transmit inter-UE coordination signals from the first UE to the second UE via a sidelink interface.

[0009] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes one or more instructions that, when executed by one or more processors of a first UE, cause the first UE to: select sidelink resources for inter-UE coordination signaling with a second UE; and use the sidelink resources to transmit inter-UE coordination signals from the first UE to the second UE via a sidelink interface.

[0010] In some aspects, a first device for wireless communication includes: components for selecting sidelink resources for coordination signaling with a second device; and components for transmitting coordination signals from the first device to the second device via a sidelink interface using the sidelink resources.

[0011] The terms generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication equipment and / or processing systems that are substantially described and illustrated herein with reference to the accompanying drawings and description.

[0012] 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 modifications or designs of other structures for achieving the same purpose as 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.

[0013] While aspects have been described in this disclosure by way of example, those skilled in the art will understand that such aspects can be implemented in many different arrangements and scenarios. The techniques described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or package arrangements. For example, some aspects can be implemented via integrated chip embodiments or other devices based on non-modular components (e.g., end-user equipment, vehicles, communication equipment, computing devices, industrial equipment, retail / purchasing devices, medical devices, or AI-enabled devices). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating the described aspects and features may include additional components and features for the implementation and practice of the claimed and described aspects. For example, the transmission and reception of wireless signals may include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors(multiple), interleavers, adders, or summers). The aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements, or end-user equipment of different sizes, shapes, and configurations. Attached Figure Description

[0014] To gain a more detailed understanding of the foregoing features of this disclosure, reference can be made to some of the aspects illustrated in the accompanying drawings for a more specific description of the brief overview above. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and should not be considered as limiting its scope, as the description may acknowledge other equally valid aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0015] Figure 1This is a diagram illustrating an example of a wireless network according to the present disclosure.

[0016] Figure 2 This is a diagram illustrating an example of a base station communicating with a user equipment (UE) in a wireless network according to the present disclosure.

[0017] Figure 3 This is a diagram illustrating an example of sidelink communication according to this disclosure.

[0018] Figure 4 This is a diagram illustrating examples of sidelink communication and access link communication according to this disclosure.

[0019] Figure 5 This is a diagram illustrating an example of coordination signaling according to this disclosure.

[0020] Figure 6-7 This is a diagram illustrating an example of coordination signaling associated with sidelink resource selection according to this disclosure.

[0021] Figure 8 This is a diagram illustrating an example process associated with coordination signaling for sidelink resource selection according to this disclosure. Detailed Implementation

[0022] Various aspects of this disclosure will be described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented throughout this disclosure. Rather, these aspects are provided to make this disclosure thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should understand that the scope of this disclosure is intended to cover any aspect of this disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of the aspects set forth herein may be used to implement an apparatus or practice. Furthermore, the scope of this disclosure is intended to cover an apparatus or method that is practiced using other 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.

[0023] Several aspects of a telecommunications system will now be presented with reference to various devices and technologies. These devices and technologies will be described in detail below and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented in hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0024] It should be noted that although the terms commonly associated with 5G or NR radio access technology (RAT) may be used to describe the aspects herein, the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0025] Figure 1 This diagram illustrates an example of a wireless network 100 according to this disclosure. Wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network, etc. Wireless network 100 may include multiple base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with user equipment (UE) and may also be referred to as an NRBS, Node B, gNB, 5G Node B (NB), access point, Transmit / Receive Point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0026] A Base Station (BS) can provide communication coverage for macrocells, picocells, femtocells, and / or another type of cell. 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)). A BS for a macrocell can be referred to as a macro BS. A BS for a picocell can be referred to as a pico BS. A BS for a femtocell can be referred to as a femtocell BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS of macro cell 102a, BS 110b can be a pico BS of pico cell 102b, and BS 110c can be a femto BS of femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably herein.

[0027] In some respects, the cell may not necessarily be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some respects, the BS may use any suitable transport network to interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections or virtual networks.

[0028] The wireless network 100 may also include relay stations. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS110a and UE 120d. A relay BS can also be referred to as a relay station, relay base station, relay, etc.

[0029] Wireless network 100 can be a heterogeneous network, including different types of base stations (BSs), such as macro BSs, pico BSs, femto BSs, and relay BSs. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs may have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0030] Network controller 130 can be coupled to a group of base stations (BSs) and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. Base stations can also communicate with each other directly or indirectly via wireless or wired backhaul.

[0031] UEs 120 (e.g., 120a, 120b, 120c) may be distributed across the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biosensor / device, a wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a GPS device, or any other suitable device configured to communicate via wireless or wired media.

[0032] Some UEs can be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which can communicate with a base station, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide connectivity to or from a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, and / or can be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs can be considered Customer Premises Equipment (CPE). UE 120 can be included within a housing that houses components of UE 120, such as processor components and / or memory components. In some aspects, the processor components and memory components can be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) can be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0033] Typically, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific 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, channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0034] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communication with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols) and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations performed by base station 110 as described elsewhere herein.

[0035] Devices of wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices of wireless network 100 may communicate using an operating band having a first frequency range (FR1) spanning from 410 MHz to 7.125 GHz, and / or may communicate using an operating band having a second frequency range (FR2) spanning from 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency bands. Although a portion of FR1 is greater than 6 GHz, FR1 is generally referred to as the “sub-6 GHz” band. Similarly, FR2 is often referred to as the “millimeter wave” band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) designated as the “millimeter wave” band by the International Telecommunication Union (ITU). Therefore, unless specifically stated otherwise, it should be understood that the terms “sub-6 GHz”, etc., if used herein, may broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or intermediate frequency bands (e.g., greater than 7.125 GHz). Similarly, unless otherwise stated, it should be understood that the terms "millimeter wave," etc., if used herein, can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or intermediate band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0036] As indicated above, Figure 1 This is provided as an example. Other examples may differ from those provided. Figure 1 As described.

[0037] Figure 2 This is a diagram illustrating an example 200 of a base station 110 communicating with a UE 120 in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein typically T ≥ 1 and R ≥ 1.

[0038] At base station 110, transmitting processor 220 can receive data from data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on the channel quality indicator (CQI) received from each UE, process (e.g., encode and modulate) the UE's data based at least in part on the MCS(multiple) selected for each UE, and provide data symbols for all UEs. Transmitting processor 220 can also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmitting processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its own output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t respectively.

[0039] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) the received signals to obtain input samples. Each demodulator 254 can further process the input samples (e.g., for OFDM) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols if applicable, and provide the detected symbols. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide the decoded data of UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as the Reference Signal Received Power (RSRP), Received Signal Strength Indicator (RSSI), Reference Signal Received Quality (RSRQ), and / or CQI, etc. In some respects, one or more components of the UE 120 may be included in the housing 284.

[0040] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0041] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or be included in one or more antenna panels, antenna groups, multiple sets of antenna elements, and / or antenna arrays. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include a set of coplanar antenna elements and / or a set of non-coplanar antenna elements. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include antenna elements within a single housing and / or multiple antenna elements within housings. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (such as...) Figure 2 One or more antenna elements (one or more components).

[0042] On the uplink, at UE 120, the transmitting processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, and / or CQI). The transmitting processor 264 can also generate reference symbols for one or more reference signals. If applicable, the symbols from the transmitting processor 264 can be pre-encoded by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of UE 120 may be included in a modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The processor (e.g., controller / processor 280) and memory 282 may be used with the transceiver to perform aspects of any of the methods described herein (e.g., as referenced). Figure 6-8 (As described).

[0043] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 for scheduling UE 120 for downlink and / or uplink communication. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of base station 110 may be included in a modem that can be located in base station 110. In some aspects, base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The processor (e.g., controller / processor 240) and memory 242 may be used with the transceiver to perform aspects of any of the methods described herein (e.g., as referenced). Figure 6-8 (As described).

[0044] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2 Any other component(s) may execute one or more techniques associated with coordination signaling for sidelink resource selection, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component(s) can perform or direct, for example Figure 8 The operation of process 800 and / or other processes described herein. Memory 242 and 282 may store data and program code of base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when one or more instructions are executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, translation, and / or interpretation), they may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 8 The operation of process 800 and / or other processes described herein. In some aspects, the execution instructions may include run instructions, translation instructions, compilation instructions and / or interpretation instructions, etc.

[0045] In some aspects, the UE (e.g., UE 120) may include components for selecting sidelink resources for inter-UE coordination signaling with the second UE, components for transmitting inter-UE coordination signals from the first UE to the second UE via a sidelink interface using the sidelink resources, and / or other components. In some aspects, such components may include combinations of... Figure 2 One or more components of the described UE 120, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258 and / or others.

[0046] Although Figure 2 The boxes in the diagram represent different components, but the functions described above for the boxes can be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described for the transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by or under the control of the controller / processor 280.

[0047] As indicated above, Figure 2 This is provided as an example. Other examples may differ from those provided. Figure 2 As described.

[0048] Figure 3 This is a diagram illustrating an example 300 of sidelink communication according to this disclosure.

[0049] like Figure 3 As shown, the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more sidelink channels 310. UEs 305-1 and 305-2 can communicate using one or more sidelink channels 310 for P2P communication, D2D communication, V2X communication (e.g., may include V2V communication, V2I communication, vehicle-to-person (V2P) communication and / or others), mesh networking and / or others. In some aspects, UEs 305 (e.g., UEs 305-1 and / or UEs 305-2) can be similar to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, the one or more sidelink channels 310 can use a PC5 interface and / or can operate in a high-frequency band (e.g., the 5.9 GHz band). Additionally or alternatively, UE 305 may use Global Navigation Satellite System (GNSS) timing to synchronize the timing of transmission time intervals (TTIs) (e.g., frames, subframes, time slots, symbols, and / or others).

[0050] like Figure 3 As further shown, one or more sidelink channels 310 may include a Physical Sidelink Control Channel (PSCCH) 315, a Physical Sidelink Shared Channel (PSSCH) 320, and / or a Physical Sidelink Feedback Channel (PSFCH) 325. PSCCH 315 may be used for communication control information, similar to a Physical Downlink Control Channel (PDCCH) and / or a Physical Uplink Control Channel (PUCCH) for cellular communication with base station 110 via an access link or access channel. PSSCH 320 may be used for communication data, similar to a Physical Downlink Shared Channel (PDSCH) and / or a Physical Uplink Shared Channel (PUSCH) for cellular communication with base station 110 via an access link or access channel. For example, PSCCH 315 may carry Sidelink Control Information (SCI) 330, which may indicate various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, spatial resources, and / or others) that may be carried on transport blocks (TB) 335 on PSSCH 320. TB 335 may include data. The PSFCH325 can be used for communication-side link feedback 340, such as Hybrid Automatic Repeat Request (HARQ) feedback (e.g., Acknowledgment or Negative Acknowledgment (ACK / NACK) messages), Transmit Power Control (TPC), Schedule Request (SR), and / or others.

[0051] In some aspects, one or more sidelink channels 310 may use resource pools. For example, a scheduling assignment may be transmitted in a subchannel using a specific resource block (RB) (e.g., included in SCI 330). In some aspects, data transmission associated with a scheduling assignment (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and associated data transmission are not transmitted on adjacent RBs.

[0052] In some aspects, UE 305 may operate using a transmission mode in which resource selection and / or scheduling is performed by UE 305 (e.g., not base station 110). In some aspects, UE 305 may perform resource selection and / or scheduling by sensing the availability of channels for transmission. For example, UE 305 may measure RSSI parameters (e.g., sidelink-RSSI (S-RSSI) parameters) associated with various sidelink channels, RSRP parameters (e.g., PSSCH-RSRP parameters) associated with various sidelink channels, RSRQ parameters (e.g., PSSCH-RSRQ parameters) associated with various sidelink channels, and / or others, and may select channels for transmitting sidelink communication based at least in part on (multiple) these measurements.

[0053] Alternatively or additionally, UE 305 may use SCI 330 received in PSCCH 315 to perform resource selection and / or scheduling, which may indicate occupied resources, channel parameters, and / or other information. Alternatively or additionally, UE 305 may perform resource selection and / or scheduling by determining the channel busy rate (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating the maximum number of resource blocks available to UE 305 for a particular group of subframes).

[0054] In transport modes where resource selection and / or scheduling is performed by UE 305, UE 305 can generate sidelink grants and can send these grants in SCI 330. For example, a sidelink grant can indicate one or more parameters (e.g., transport parameters) to be used for an upcoming sidelink transport, such as one or more resource blocks (e.g., for TB335) to be used for an upcoming sidelink transport on PSSCH 320, one or more subframes to be used for an upcoming sidelink transport, MCS and / or others to be used for an upcoming sidelink transport. In some aspects, UE 305 can generate sidelink grants that indicate one or more parameters for semi-persistent scheduling (SPS), such as the periodicity of the sidelink transport. Furthermore, or alternatively, UE 305 can generate sidelink grants for event-driven scheduling (such as for on-demand sidelink messages).

[0055] As indicated above, Figure 3 This is provided as an example. Other examples may differ from those provided. Figure 3 As described.

[0056] Figure 4 This is a diagram illustrating example 400 of sidelink communication and access link communication according to this disclosure.

[0057] like Figure 4 As shown, the transmitter (Tx) / receiver (Rx) UE 405 and the Rx / Tx UE 410 can communicate with each other via a side link, as described above. Figure 3 As further shown, in some sidelink modes, base station 110 may communicate with Tx / Rx UE 405 via a first access link. Additionally or alternatively, in some sidelink modes, base station 110 may communicate with Rx / Tx UE 410 via a second access link. Tx / Rx UE 405 and / or Rx / Tx UE 410 may be similar to one or more UEs described elsewhere herein, such as... Figure 1 Therefore, the direct link between UE 120 (e.g., via the PC5 interface) can be referred to as a side link, and the direct link between base station 110 and UE 120 (e.g., via the Uu interface) can be referred to as an access link. Side link communication can be transmitted via the side link, and access link communication can be transmitted via the access link. Access link communication can be downlink communication (from base station 110 to UE 120) or uplink communication (from UE 120 to base station 110).

[0058] As indicated above, Figure 4 This is provided as an example. Other examples may differ from those provided. Figure 4 As described.

[0059] Figure 5 This is a diagram illustrating example 500 of the coordination signaling according to this disclosure.

[0060] In Example 500, a first UE (e.g., UE 120a) exchanges inter-UE coordination signaling with a second UE (e.g., UE 120e). The first and second UEs can operate in an in-coverage mode (where both the first and second UEs are within the radio access network coverage), a partial coverage mode (where only one of the first and second UEs is within the radio access network coverage), an out-of-coverage mode (where neither the first nor the second UE is within the radio access network coverage), and / or other modes. In some aspects, the first UE can determine a set of sidelink resources available for resource allocation. The first UE can determine the sidelink resource set at least in part based on determining to select a sidelink resource set, or at least in part based on a request received from the second UE or a base station (referred to herein as an inter-UE coordination request). In some aspects, the first UE can determine the sidelink resource set at least in part based on a sensing operation, which can be performed before or after receiving the inter-UE coordination request. The first UE can send information indicating the available resource set to the second UE via inter-UE coordination signaling (represented as a coordination message and, in some aspects, as an inter-UE coordination message). The first UE can use NR sidelink resource allocation mode 2 to transmit the available resource set. In NR sidelink resource allocation mode 2, resource allocation is handled by the UE (e.g., compared to NR sidelink resource allocation mode 1, where resource allocation is handled by a scheduling entity such as a base station). The second UE can select sidelink resources for transmissions from the second UE based at least in part on the available resource set received from the first UE. As shown, the second UE can perform transmissions that take into account coordination information (e.g., sidelink resources indicated via inter-UE coordination messages and / or others). Inter-UE coordination signaling can also be used to indicate resources that are not preferred for the second UE's transmissions. Inter-UE coordination signaling associated with resource allocation can reduce conflicts between the first and second UEs. Inter-UE coordination signaling associated with resource allocation can reduce power consumption of the first UE and / or the second UE.

[0061] As indicated above, Figure 5 This is provided as an example. Other examples may differ from those provided. Figure 5 As described.

[0062] A first UE may send an inter-UE coordination request to a second UE. For example, the first UE may request an inter-UE coordination report from the second UE. The inter-UE coordination report may include a set of sidelink resources available for resource allocation (e.g., preferred), a set of sidelink resources not preferred for resource allocation, or others. The set of sidelink resources available for resource allocation may be from the perspective of the second UE. The second UE may receive the request from the first UE. The second UE may send an inter-UE coordination report to the first UE based at least in part on the inter-UE coordination request received from the first UE. In some aspects, the first UE may select resources for transmissions to be used by the second UE, and then schedule the second UE by transmitting an inter-UE coordination message. In some other aspects, the second UE may consider the inter-UE coordination message when selecting resources (e.g., the inter-UE coordination message may be non-bonding on the second UE).

[0063] However, when the first UE and the second UE send inter-UE coordination requests and inter-UE coordination reports, respectively, they may not know which sidelink resources to use. In other words, the first UE and the second UE may not be configured to select sidelink resources for inter-UE coordination signaling. Without a defined sidelink resource selection scheme for inter-UE coordination signaling, the first UE and the second UE may send inter-UE coordination requests and / or inter-UE coordination reports on sidelink resources already reserved for other sidelink transmissions, leading to conflicts between sidelink transmissions and inter-UE coordination message passing. This conflict reduces throughput, increases interference, and degrades the efficiency of sidelink communication.

[0064] In various aspects of the technologies and apparatus described herein, sidelink resources can be defined for inter-UE coordination signaling. A first UE can select sidelink resources for sending inter-UE coordination requests. A second UE can select sidelink resources for sending inter-UE coordination reports. In some aspects, the sidelink resources for sending inter-UE coordination requests and / or inter-UE coordination reports can be selected at least in part based on a sensing and reservation resource allocation scheme (e.g., mode 2 resource allocation). In some aspects, the sidelink resources for sending inter-UE coordination requests and / or inter-UE coordination reports can be selected at least in part based on a configuration received from another node (such as a base station or relay node) (e.g., mode 1 resource allocation). In some aspects, the sidelink resources for sending inter-UE coordination requests and / or inter-UE coordination reports can be selected from a dedicated resource pool for inter-UE coordination signaling. By defining sidelink resources for inter-UE coordination signaling, both the first and second UEs can increase throughput, reduce interference, and increase the efficiency of sidelink communication.

[0065] Figure 6This is a diagram illustrating an example 600 of coordination signaling for sidelink resource selection according to this disclosure. Figure 6 As shown, Example 600 includes communication between a first UE (e.g., UE 120a) and a second UE (e.g., UE 120e). In some aspects, the first UE and the second UE may be included in a wireless network such as wireless network 100. The first UE and the second UE may communicate on a wireless sidelink.

[0066] As shown by reference numeral 602 in the attached figure, the first UE can select sidelink resources for inter-UE coordination signaling. For example, the first UE can select sidelink resources for an inter-UE coordination request to be sent to the second UE.

[0067] In some aspects, the first UE may select the sidelink resource for sending the inter-UE coordination request based at least in part on sidelink resource allocation (e.g., mode 2 resource allocation). The sidelink resource can be selected from multiple sidelink resources (e.g., resources available for sidelinks may potentially be available for sending the inter-UE coordination request). In some aspects, the first UE may sense available sidelink resources and reserve those resources for sending the inter-UE coordination request. Selecting a sidelink resource based at least in part on sensing and reservation may result in additional latency, which may increase the likelihood that the inter-UE coordination report received at least in part based on the request may be outdated (e.g., too old to be useful to the second UE). In some aspects, sensing and reservation can be performed by the first UE on sidelink resources dedicated to sending the inter-UE coordination request, which may reduce the likelihood of conflicts between the PSSCH and the inter-UE coordination request.

[0068] In some respects, the first UE can select sidelink resources for sending inter-UE coordination requests based at least in part on a sidelink resource configuration that defines a sidelink resource set. For example, the sidelink resource set can be configured for inter-UE coordination signaling. The first UE can receive the sidelink resource configuration from a base station or another node (such as a relay node or another UE). The first UE can select sidelink resources for sending inter-UE coordination requests from the sidelink resource set defined by the sidelink resource configuration. In other words, the sidelink resource set included in the sidelink resource configuration can be defined by the base station and / or relay node, and the first UE can select sidelink resources from the sidelink resource set included in the sidelink resource configuration.

[0069] In some aspects, a first UE may select sidelink resources from dedicated resources in a sidelink resource pool for sending inter-UE coordination requests. These dedicated resources in the sidelink resource pool may be resources reserved for inter-UE coordination signaling. Dedicated resources may be pre-configured by sidelink resource pool, and / or by carrier. In some aspects, dedicated resources may be pre-configured by bandwidth portion. In some aspects, dedicated resources may be configured by sidelink resource pool, by carrier, and / or by bandwidth portion (e.g., via RRC signaling).

[0070] In some respects, the first UE can select sidelink resources from a sidelink resource pool dedicated to inter-UE coordination signaling for sending inter-UE coordination requests. In other words, in this case, the sidelink resource pool can be a dedicated resource pool for inter-UE coordination signaling (e.g., sending inter-UE coordination requests), which is the opposite of selecting sidelink resources from dedicated resources in a public sidelink resource pool that can be used for purposes other than inter-UE signaling.

[0071] In some aspects, the sidelink resources selected for transmitting inter-UE coordination requests may be associated with one or more subchannels (e.g., may occupy one or more subchannels, or may be configured to occupy one or more subchannels). In some aspects, sidelink resources may be associated with one or more resource blocks (e.g., may occupy one or more resource blocks, or may be configured to occupy one or more resource blocks). Sidelink resources may be included in multiple sidelink resources configured in a defined periodicity. Multiple sidelink resources may be configured in a single sidelink time slot (e.g., in different frequency resources within a single sidelink time slot), or multiple sidelink resources may be distributed across multiple sidelink time slots.

[0072] In some aspects, multiple sidelink resources can be configured in both the frequency and time domains to facilitate the transmission of inter-UE coordination requests, thereby reducing latency. For example, multiple sidelink resources can be relatively sparse in frequency but relatively dense in time to reduce latency in transmitting inter-UE coordination requests. Figure 7 The lower half of the diagram illustrates multiple sidelink resources that are relatively sparse in frequency but relatively dense in time. It can be seen that the sidelink resources appear in rows across multiple time slots, but only in every fifth frequency resource within a given time slot. In some respects, a first UE can send signaling to multiple sidelink UEs indicating that multiple sidelink resources available for sending inter-UE coordination requests are unavailable for data transmission. As a result, multiple sidelink UEs can perform data transmission without using these multiple sidelink resources.

[0073] In some respects, the mechanism described herein for selecting sidelink resources for sending inter-UE coordination requests can be used in sidelink bands where V2X can be deployed. The mechanism described herein can also be used in other bands, such as Intelligent Transportation Systems (ITS) bands. ITS bands can be used for data exchange between high-speed vehicles and between vehicles and roadside infrastructure. ITS bands can be licensed bands of 5.9 GHz (e.g., 5.85–5.925 GHz).

[0074] As shown by reference numeral 604 in the attached figure, the first UE can use sidelink resources to send an inter-UE coordination request to the second UE. In other words, the first UE can send the inter-UE coordination request on sidelink resources selected at least in part based on sensing and holding performed at the first UE, sidelink resource configuration received at the first UE, dedicated resources in the sidelink resource pool, dedicated resource pools, and / or others. The first UE can send the inter-UE coordination request to the second UE through the sidelink interface.

[0075] As shown by reference numeral 606 in the attached figure, the second UE can receive inter-UE coordination requests from the first UE. The second UE can select sidelink resources for inter-UE coordination signaling. For example, the second UE can select sidelink resources for an inter-UE coordination report to be sent to the first UE.

[0076] In some aspects, the second UE can select sidelink resources for sending inter-UE coordination reports, at least in part, based on sidelink resource allocation. Sidelink resources can be selected from multiple sidelink resources (e.g., resources available for sidelink communication may potentially be available for sending inter-UE coordination reports). The second UE can sense available sidelink resources and / or reserve those resources for sending inter-UE coordination reports. Sensing and reservation can be performed by the second UE on sidelink resources dedicated to sending inter-UE coordination reports, which can reduce the likelihood of conflicts between PSSCH and inter-UE coordination reports. In some aspects, the second UE can reserve sidelink resources without sensing them.

[0077] In some respects, the second UE can select sidelink resources for sending inter-UE coordination reports based at least in part on a sidelink resource configuration that defines the sidelink resource set. The second UE can receive the sidelink resource configuration from a base station or another node (such as a relay node). The second UE can select sidelink resources for sending inter-UE coordination reports from the sidelink resource set included in the sidelink resource configuration. In other words, the sidelink resource set included in the sidelink resource configuration can be defined by the base station and / or relay node, and the second UE can select sidelink resources from the sidelink resource set included in the sidelink resource configuration.

[0078] In some respects, the second UE can select sidelink resources from dedicated resources in the sidelink resource pool for sending inter-UE coordination reports. Dedicated resources in the sidelink resource pool may be resources reserved for inter-UE coordination signaling. Dedicated resources may be pre-configured per sidelink resource pool, and / or per carrier. Dedicated resources may be associated with durations based on time slots (e.g., one or more time slots) or based on partial time slots (e.g., one or more symbols of a time slot). Dedicated resources may be defined on semi-static uplink symbols.

[0079] In some respects, the second UE can select sidelink resources from a sidelink resource pool dedicated to inter-UE coordination signaling for sending inter-UE coordination reports. In other words, in this case, the sidelink resource pool can be a dedicated resource pool for inter-UE coordination signaling (e.g., sending inter-UE coordination reports), which is the opposite of selecting sidelink resources from dedicated resources in a public sidelink resource pool that can be used for purposes other than inter-UE signaling.

[0080] In some respects, the sidelink resources selected for transmitting inter-UE coordination reports can be associated with one or more subchannels. Sidelink resources can be included in multiple sidelink resources configured in a defined periodic manner. Multiple sidelink resources can be configured in a single sidelink time slot, or they can be distributed across multiple sidelink time slots.

[0081] In some respects, multiple sidelink resources that can be used to send inter-UE coordination reports can be configured in both the frequency and time domains to reduce latency. For example, multiple resources can be relatively sparse in frequency but relatively dense in time to reduce the delay in sending inter-UE coordination reports.

[0082] In some aspects, the second UE can send signaling to multiple sidelink UEs indicating that multiple sidelink resources available for sending inter-UE coordination reports are unavailable for data transmission. As a result, multiple sidelink UEs can perform data transmission without using these multiple sidelink resources.

[0083] In some respects, the mechanism described herein for selecting sidelink resources for sending inter-UE coordination reports can be used in sidelink bands where V2X can be deployed. The mechanism described herein can also be used in other bands, such as the ITS band.

[0084] In some respects, the sidelink resource selected by the first UE for sending inter-UE coordination requests may be a first sidelink resource, and the sidelink resource selected by the second UE for sending inter-UE coordination reports may be a second sidelink resource.

[0085] In some aspects, the second UE may determine the second sidelink resource for sending the inter-UE coordination report based at least in part on the first sidelink resource used to send the inter-UE coordination request. For example, the second UE may map the first sidelink resource to the second sidelink resource. In other words, the second sidelink resource may be mapped or determined based at least in part on the first sidelink resource. The first and second sidelink resources may be included in the same defined period. In some cases, the first sidelink resource used to send the inter-UE coordination request may be mapped to two or more sidelink resources used to send the inter-UE coordination report.

[0086] In some aspects, the second UE can determine the second sidelink resource for transmitting inter-UE coordination reports based at least in part on a sidelink resource association scheme. For example, the second UE can determine the second sidelink resource based at least in part on mapping an initial subchannel associated with a first sidelink resource to the second sidelink resource. The initial subchannel used to transmit an inter-UE coordination request can be used to determine the second sidelink resource for transmitting the inter-UE coordination report. The second UE can determine additional sidelink resources for inter-UE coordination reports based at least in part on a fixed offset relative to the second sidelink resource. For example, the initial subchannel used to transmit an inter-UE coordination request can be mapped to a single sidelink resource used to transmit the inter-UE coordination report, and other sidelink resources used for inter-UE coordination reports can be implicitly derived (e.g., by defining a fixed offset relative to the second sidelink resource used to transmit the inter-UE coordination report).

[0087] In some respects, the second UE can map the sub-channels associated with the first sidelink resources used to send inter-UE coordination requests to a set of sidelink resources that can be used for inter-UE coordination reports. In other words, the sub-channels used to send the request can be mapped to this set of sidelink resources, and this set of sidelink resources can become available for selecting and sending inter-UE coordination reports.

[0088] In some aspects, a first sidelink resource may be included in a first plurality of sidelink resources, and a second sidelink resource may be included in a second plurality of sidelink resources. The second plurality of sidelink resources may be a multiple of the first plurality of sidelink resources (e.g., denoted by α). This multiple may be an integer greater than or equal to 1. For example, a single sidelink resource used to send an inter-UE coordination request may be mapped to one or more sidelink resources that can be used to send an inter-UE coordination report. In other words, the number of sidelink resources that can be used to send an inter-UE coordination report may be greater than or equal to the number of sidelink resources that can be used to send an inter-UE coordination request.

[0089] The number of sidelink resources available for sending inter-UE coordination requests and inter-UE coordination reports can be pre-configured separately. Treating subchannels as frequency units for defining sidelink resources, the subchannel sizes can be set differently for sidelink resources used to send inter-UE coordination requests and for those used to send inter-UE coordination reports.

[0090] In some respects, a second UE can map a first sidelink resource to a second sidelink resource, at least in part, based on an index assigned to the first sidelink resource. This index can be assigned to the first sidelink resource and mapped to one or more sidelink resources that can be used to send inter-UE coordination reports. For example, a first sidelink resource with a first index can be mapped to a second sidelink resource, where the second sidelink resource can be a multiple of the first sidelink resource. As another example, K sidelink resources used to send inter-UE coordination requests can be mapped to each of the first sidelink resources in a K consecutive set of sidelink resources that can be used for inter-UE coordination reports, where K is a positive integer.

[0091] In some aspects, the second UE can map a first sidelink resource to multiple sidelink resources, wherein at least a portion of the multiple sidelink resources can be used to send inter-UE coordination reports. For example, the second UE can map a single sidelink resource used to send an inter-UE coordination request to multiple sidelink resources. These multiple sidelink resources can be used to send inter-UE coordination reports at least partially based on rate matching. For example, a message carrying inter-UE coordination information can be mapped to all available resources. Multiple sidelink resources can be used to send inter-UE coordination reports, but the same transport block can be repeated in each of the multiple sidelink resources. As an example, multiple UEs can respond to requests from a given UE, and supplying multiple sidelink resources for inter-UE coordination reports can reduce the likelihood of collisions. Alternatively, a single sidelink resource among the multiple sidelink resources can be used to send inter-UE coordination reports.

[0092] As shown by reference numeral 608 in the attached figure, the second UE can use sidelink resources to send inter-UE coordination reports to the first UE. In other words, the second UE can send inter-UE coordination reports on sidelink resources selected at least in part based on sensing and holding performed at the second UE, sidelink resource configuration received at the second UE, dedicated resources in the sidelink resource pool, the mapping between the dedicated resource pool, sidelink resources used for sending inter-UE coordination requests and inter-UE coordination reports, and / or other factors. The second UE can send inter-UE coordination reports to the first UE through the sidelink interface.

[0093] In some respects, the inter-UE coordination report sent by the second UE may include a set of sidelink resources available for resource allocation. The first UE may receive the inter-UE coordination report, and the first UE may select sidelink resources for sidelink transmission based at least in part on the inter-UE coordination report received from the second UE.

[0094] As indicated above, Figure 6 This is provided as an example. Other examples may differ from those provided. Figure 6 As described.

[0095] Figure 7 This is a diagram illustrating example 700 of coordination signaling for sidelink resource selection according to this disclosure.

[0096] like Figure 7 As shown, sidelink resources can be configured to send inter-UE coordination requests and inter-UE coordination reports. Sidelink resources can be configured periodically. Sidelink resources can be configured in a single sidelink time slot (top figure) or distributed across multiple sidelink time slots (bottom figure). A given sidelink resource can occupy a single subchannel or multiple subchannels. Sidelink resources can be configured in both the frequency and time domains to reduce latency when sending inter-UE coordination requests. For example, multiple sidelink resources can be relatively sparse in frequency but relatively dense in time to reduce latency when sending inter-UE coordination requests, such as... Figure 7 The lower part is shown in the diagram.

[0097] In some aspects, sidelink resource associativity can be used to map sidelink resources used for sending inter-UE coordination requests to one or more sidelink resources that can be used for inter-UE coordination reports. The starting subchannel used for sending the inter-UE coordination request can be used to determine one or more sidelink resources that can be used for sending the inter-UE coordination report. The starting subchannel can be mapped to a single sidelink resource used for sending the inter-UE coordination report, and additional sidelink resources that can be used for the inter-UE coordination report can be implicitly determined (e.g., by defining a fixed offset relative to the sidelink resource used for sending the inter-UE coordination request). A given subchannel used for sending the inter-UE coordination request can be mapped to a set of sidelink resources that can be used for inter-UE coordination reports.

[0098] As indicated above, Figure 7 This is provided as an example. Other examples may differ from the reference. Figure 7 As described.

[0099] Figure 8This is a diagram illustrating an example process 800 performed, for example, by a first UE according to this disclosure. Example process 800 is an example of a first UE (e.g., UE 120) performing operations associated with coordination signaling for sidelink resource selection.

[0100] like Figure 8 As shown, in some aspects, process 800 may include selecting sidelink resources for UE-to-UE coordination signaling with the second UE (block 810). For example, as described above, the first UE (e.g., using antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280 and / or memory 282) may select sidelink resources for UE-to-UE coordination signaling with the second UE.

[0101] like Figure 8 As further illustrated, in some aspects, process 800 may include using sidelink resources to transmit inter-UE coordination signals from a first UE to a second UE via a sidelink interface (block 820). For example, as described above, the first UE (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may use sidelink resources to transmit inter-UE coordination signals from the first UE to the second UE via a sidelink interface.

[0102] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other process descriptions elsewhere herein.

[0103] In the first aspect, inter-UE coordination signals are associated with inter-UE coordination requests.

[0104] In the second aspect, either alone or in combination with the first aspect, UE coordination signals are associated with UE coordination reports.

[0105] In the third aspect, either alone or in combination with one or more of the first and second aspects, selecting sidelink resources for inter-UE coordination signaling includes selecting sidelink resources from dedicated resources for inter-UE coordination signaling in the sidelink resource pool.

[0106] In the fourth aspect, dedicated resources are pre-configured, either alone or in combination with one or more of the first to third aspects, by sidelink resource pools or by carriers.

[0107] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, selecting sidelink resources for inter-UE coordination signaling includes selecting sidelink resources from a pool of sidelink resources dedicated to inter-UE coordination signaling.

[0108] In the sixth aspect, either alone or in combination with one or more of the first to fifth aspects, sidelink resources are associated with one or more sub-channels.

[0109] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the sidelink resources are included in a plurality of sidelink resources that can be used for coordination signaling between UEs, and the plurality of sidelink resources are configured at a defined periodicity.

[0110] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, multiple sidelink resources that can be used for UE-to-UE coordination signaling may be configured in a single sidelink time slot or distributed across multiple sidelink time slots.

[0111] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, multiple sidelink resources that can be used for inter-UE coordination signaling are configured in the frequency and time domains to reduce latency.

[0112] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 800 includes sending signaling to a plurality of UEs, including the second UE, to indicate that a plurality of sidelink resources are unavailable for data transmission.

[0113] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 800 includes receiving a sidelink resource configuration that defines a set of sidelink resources, wherein selecting sidelink resources for inter-UE coordination signaling includes selecting sidelink resources at least in part based on the sidelink resource configuration.

[0114] In the twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the receiver-side link resource configuration includes receiving the receiver-side link resource configuration from the base station or relay node.

[0115] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, selecting sidelink resources for inter-UE coordination signaling includes selecting sidelink resources at least in part based on sidelink resource allocation, in which the UE senses available sidelink resources and reserves those sidelink resources.

[0116] In the fourteenth aspect, selecting sidelink resources, either alone or in combination with one or more of the first to thirteenth aspects, at least in part based on sidelink resource allocation, includes sensing available sidelink resources from a sidelink resource pool dedicated to inter-UE coordination signaling.

[0117] In the fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, the inter-UE coordination signal is a first inter-UE coordination signal, and the side link resource is a first side link resource, and the process 800 further includes receiving a second inter-UE coordination signal from a second UE via a side link interface using a second side link resource.

[0118] In the sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the first inter-UE coordination signal is associated with an inter-UE coordination request, and the second inter-UE coordination signal is associated with an inter-UE coordination report sent at least in part based on the inter-UE coordination request.

[0119] In the seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, process 800 includes mapping a second sidelink resource to a first sidelink resource.

[0120] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, process 800 includes determining the second sidelink resource based at least in part on mapping the starting subchannel associated with the first sidelink resource to the second sidelink resource.

[0121] In the nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, process 800 includes determining additional sidelink resources for inter-UE coordination signaling based at least in part on a fixed offset relative to the second sidelink resources.

[0122] In the twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, process 800 includes mapping a subchannel associated with a first sidelink resource to a set of sidelink resources that can be used for inter-UE coordination signaling.

[0123] In aspect 21, either alone or in combination with one or more of aspects 1 to 20, the first sidelink resource and the second sidelink resource are included in the same defined period.

[0124] In the twenty-second aspect, either alone or in combination with one or more of the first to twenty-first aspects, the first sidelink resource is included in the first plurality of sidelink resources, and the second sidelink resource is included in the second plurality of sidelink resources, and the second plurality of sidelink resources is a multiple of the first plurality of sidelink resources.

[0125] In the twentieth aspect, either alone or in combination with one or more of the first to twenty-two aspects, process 800 includes mapping the second side link resource to the first side link resource based at least in part on the index assigned to the first side link resource.

[0126] In the twentieth aspect, either alone or in combination with one or more of the first to twenty-third aspects, process 800 includes mapping a first sidelink resource to a plurality of sidelink resources, wherein at least a portion of the plurality of sidelink resources can be used to transmit a second inter-UE coordination signal.

[0127] although Figure 8 An example box of process 800 is shown, but in some respects, process 800 may include more than Figure 8 The boxes depicted in the diagram may include additional boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, two or more boxes in process 800 may be executed in parallel.

[0128] The following provides an overview of some aspects of this disclosure:

[0129] Aspect 1: A wireless communication method performed by a first user equipment (UE), comprising: selecting sidelink resources for inter-UE coordination signaling with a second UE; and using the sidelink resources to transmit an inter-UE coordination signal from the first UE to the second UE via a sidelink interface.

[0130] Aspect 2: According to the method of aspect 1, wherein the inter-UE coordination signal is associated with the inter-UE coordination request.

[0131] Aspect 3: The method described in any one of Aspects 1-2, wherein the inter-UE coordination signal is associated with the inter-UE coordination report.

[0132] Aspect 4: The method according to any one of Aspects 1-3, wherein selecting the sidelink resources for inter-UE coordination signaling includes: selecting the sidelink resources from the dedicated resources for inter-UE coordination signaling in the sidelink resource pool.

[0133] Aspect 5: According to the method of aspect 4, the dedicated resources are configured or pre-configured by sidelink resource pool, by carrier, or by bandwidth portion.

[0134] Aspect 6: The method according to any one of Aspects 1-5, wherein selecting the sidelink resources for inter-UE coordination signaling includes: selecting sidelink resources from a pool of sidelink resources dedicated to inter-UE coordination signaling.

[0135] Aspect 7: The method according to any one of aspects 1-6, wherein the sidelink resource is associated with one or more resource blocks or subchannels.

[0136] Aspect 8: The method according to any one of aspects 1-7, wherein the sidelink resources are included in a plurality of sidelink resources available for coordination signaling between UEs, and wherein the plurality of sidelink resources are configured to have a defined periodicity.

[0137] Aspect 9: According to the method of aspect 8, multiple sidelink resources available for inter-UE coordination signaling are configured in a single sidelink time slot or distributed across multiple sidelink time slots.

[0138] Aspect 10: According to the method of aspect 8, wherein multiple sidelink resources that can be used for inter-UE coordination signaling are configured in the frequency domain and time domain.

[0139] Aspect 11: The method according to aspect 8 further includes: sending signaling to a plurality of UEs, including the second UE, indicating that a plurality of sidelink resources are unavailable for data transmission.

[0140] Aspect 12: The method according to any one of Aspects 1-11 further includes: receiving a sidelink resource configuration defining a set of sidelink resources, wherein selecting sidelink resources for inter-UE coordination signaling includes: selecting sidelink resources at least partially based on the sidelink resource configuration. Specifically, selecting sidelink resources for inter-UE coordination signaling includes: selecting sidelink resources at least partially based on the sidelink resource configuration.

[0141] Aspect 13: According to the method of aspect 12, wherein the receiving side link resource configuration includes: receiving side link resource configuration from a base station or a relay node.

[0142] Aspect 14: The method according to any one of aspects 1-13, wherein selecting a sidelink resource for inter-UE coordination signaling includes: selecting a sidelink resource at least in part based on a sidelink resource allocation, wherein in the sidelink resource allocation, the UE senses an available sidelink resource and reserves that sidelink resource.

[0143] Aspect 15: According to the method of aspect 14, wherein selecting sidelink resources based at least in part on sidelink resource allocation includes: sensing available sidelink resources from a sidelink resource pool dedicated to inter-UE coordination signaling; or reserving available sidelink resources from a sidelink resource pool dedicated to inter-UE coordination signaling.

[0144] Aspect 16: The method according to any one of aspects 1-15, wherein the inter-UE coordination signal is a first inter-UE coordination signal and the side link resource is a first side link resource, and wherein the method further comprises: using a second side link resource to receive a second inter-UE coordination signal from a second UE via a side link interface.

[0145] Aspect 17: The method according to aspect 16, wherein the first inter-UE coordination signal is associated with an inter-UE coordination request, and the second inter-UE coordination signal is associated with an inter-UE coordination report sent at least in part based on the inter-UE coordination request.

[0146] Aspect 18: The method according to aspect 16 further includes: mapping the first side link resource to the second side link resource.

[0147] Aspect 19: The method according to aspect 16 further includes: mapping a subchannel associated with a first sidelink resource to a set of sidelink resources that can be used for inter-UE coordination signaling.

[0148] Aspect 20: According to the method of aspect 16, the first side link resource and the second side link resource are included in the same defined period.

[0149] Aspect 21: According to the method of aspect 16, wherein the first side link resource is included in the first plurality of side link resources, and the second side link resource is included in the second plurality of side link resources, and wherein the second plurality of side link resources is a multiple of the first plurality of side link resources.

[0150] Aspect 22: The method according to aspect 16 further includes: mapping the first-side link resource to the second-side link resource based at least in part on the index assigned to the first-side link resource.

[0151] Aspect 23: The method according to aspect 16 further includes: mapping a first sidelink resource to a plurality of sidelink resources, wherein at least a portion of the plurality of sidelink resources can be used to transmit a second inter-UE coordination signal.

[0152] Aspect 24: The method according to aspect 16 further includes: determining the second side link resource based at least in part on mapping the starting sub-channel associated with the first side link resource to the second side link resource.

[0153] Aspect 25: The method according to aspect 24 further includes: determining additional sidelink resources for inter-UE coordination signaling based at least in part on a fixed offset relative to the second sidelink resources.

[0154] Aspect 26: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more of the methods of aspects 1-25.

[0155] Aspect 27: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors being configured to perform the methods of one or more aspects of aspects 1-25.

[0156] Aspect 28: An apparatus for wireless communication, comprising at least one component for performing the methods of one or more aspects of aspects 1-25.

[0157] Aspect 29: A non-transitory computer-readable medium storing code for wireless communication, said code including instructions executable by a processor to perform methods of one or more aspects of aspects 1-25.

[0158] Aspect 30: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions including one or more instructions, when executed by one or more processors of a device, causing the device to perform the methods of one or more aspects of aspects 1-25.

[0159] The foregoing disclosure provides illustrations and descriptions, but is not intended to be exhaustive or to limit these aspects to the precise forms disclosed. Modifications and variations can be made based on the foregoing disclosure, or can be derived from practice in these aspects.

[0160] As used herein, the term "component" is intended to be interpreted broadly as hardware and / or a combination of hardware and software. "Software" should be interpreted broadly as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable programs, threads of execution, procedures and / or functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description languages, or others. As used herein, a processor is implemented in hardware and / or a combination of hardware and software. Clearly, the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, this document describes the operation and behavior of systems and / or methods without reference to specific software code, and it should be understood that software and hardware can be designed, at least in part, based on the description herein, to implement the said systems and / or methods.

[0161] As used in this article, depending on the context, satisfying the threshold can mean a value greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0162] Even if a particular combination of features is stated in the claims and / or disclosed in the specification, such combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically stated in the claims and / or not specifically disclosed in the specification. Although each dependent claim listed below may directly depend on only one claim, the disclosure of aspects includes every dependent claim that seeks to combine with each of the other claims in the claims. As used herein, the phrase “at least one” referring to a series of items means any combination of those items, including single members. For 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).

[0163] Unless explicitly stated otherwise, no element, action, or instruction used herein should be construed as critical or necessary. Furthermore, as used herein, the articles “a” and “an” are intended to include one or more items and may be used interchangeably with “one or more.” Furthermore, as used herein, the article “the” is intended to include one or more items referenced in connection with the article “the” and may be used interchangeably with “the one or more.” Furthermore, as used herein, the terms “group” and “set” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and may be used interchangeably with “one or more.” If referring to only one item, the phrase “only one” or similar language is used. Furthermore, as used herein, the terms “having,” “possessing,” etc., are intended to be open-ended terms. Furthermore, the phrase “based on” is intended to mean “at least partially based on,” unless explicitly stated otherwise. Furthermore, as used herein, the term “or” is inclusive in a series of uses and may be used interchangeably with “and / or,” unless explicitly stated otherwise (e.g., if used in conjunction with “any” or “only one”).

Claims

1. An apparatus for wireless communication at a first user equipment (UE), comprising: Memory; and One or more processors coupled to the memory are configured to cause the first UE to: Use the first sidelink resources to receive inter-UE coordination requests; and Using a second sidelink resource, an inter-UE coordination report is sent to a second UE via a sidelink interface. The second sidelink resource is selected by the first UE at least in part based on the mapping between the first sidelink resource and the second sidelink resource.

2. The apparatus according to claim 1, wherein, The one or more processors are configured to cause the first UE to: Select the second sidelink resource from the dedicated resources for inter-UE coordination signaling in the sidelink resource pool.

3. The apparatus according to claim 2, wherein, The dedicated resources are configured or pre-configured by sidelink resource pool, by carrier, or by bandwidth portion.

4. The apparatus according to claim 1, wherein, The one or more processors are configured to cause the first UE to: Select the second sidelink resource from the sidelink resource pool dedicated to inter-UE coordination signaling.

5. The apparatus according to claim 1, wherein, The second side link resource is associated with one or more resource blocks or sub-channels.

6. The apparatus according to claim 1, wherein, The first sidelink resource is included in a plurality of sidelink resources that can be used for coordination signaling between UEs, and wherein the plurality of sidelink resources are configured with a defined periodicity.

7. The apparatus according to claim 6, wherein, The multiple sidelink resources that can be used for the inter-UE coordination signaling are configured in a single sidelink time slot or distributed across multiple sidelink time slots.

8. The apparatus according to claim 6, wherein, The multiple sidelink resources that can be used for the inter-UE coordination signaling are configured in the frequency domain and the time domain.

9. The apparatus according to claim 6, wherein, The one or more processors are further configured to: Signaling indicating that the multiple sidelink resources are unavailable for data transmission is sent to multiple UEs, including the second UE.

10. The apparatus according to claim 1, wherein, The one or more processors are further configured to: Receive the sidelink resource configuration that defines the sidelink resource set. Wherein, the one or more processors are configured to cause the first UE to: The sidelink resources are selected at least in part based on the sidelink resource configuration.

11. The apparatus according to claim 10, wherein, To receive the sidelink resource configuration, the one or more processors are configured to: The sidelink resource configuration is received from a network entity or another UE.

12. The apparatus according to claim 1, wherein, The one or more processors are configured to cause the first UE to: The second sidelink resource is selected at least in part based on the sidelink resource allocation in which the first UE senses that the second sidelink resource is available and reserves the second sidelink resource.

13. The apparatus according to claim 12, wherein, The one or more processors are configured to cause the first UE to: The availability of the second sidelink resource is sensed from the sidelink resource pool dedicated to inter-UE coordination signaling; or The second sidelink resources are reserved from the sidelink resource pool dedicated to inter-UE coordination signaling.

14. The apparatus according to claim 1, wherein, The inter-UE coordination report is sent at least in part based on the inter-UE coordination request.

15. The apparatus according to claim 1, wherein, The one or more processors are further configured to cause the first UE to: Map the first side link resource to the second side link resource.

16. The apparatus according to claim 1, wherein, The one or more processors are further configured to cause the first UE to: The sub-channels associated with the first sidelink resource are mapped to a set of sidelink resources that can be used for inter-UE coordination signaling.

17. The apparatus according to claim 1, wherein, The first sidelink resource and the second sidelink resource are included in the same defined period.

18. The apparatus according to claim 1, wherein, The first sidelink resource is included in a first plurality of sidelink resources, the second sidelink resource is included in a second plurality of sidelink resources, and wherein the second plurality of sidelink resources is a multiple of the first plurality of sidelink resources.

19. The apparatus according to claim 1, wherein, The one or more processors are further configured to cause the first UE to: The first side link resource is mapped to the second side link resource, at least in part, based on the index assigned to the first side link resource.

20. The apparatus according to claim 1, wherein, The one or more processors are further configured to cause the first UE to: The first sidelink resource is mapped to multiple sidelink resources, wherein at least a portion of the multiple sidelink resources can be used to send the inter-UE coordination report.

21. The apparatus according to claim 1, wherein, The one or more processors are further configured to cause the first UE to: The second sidelink resource is determined at least in part based on mapping the starting subchannel associated with the first sidelink resource to the second sidelink resource.

22. The apparatus according to claim 21, wherein, The one or more processors are further configured to: The additional sidelink resources for inter-UE coordination signaling are determined at least in part based on a fixed offset relative to the second sidelink resources.

23. A wireless communication method performed by a first user equipment (UE), comprising: Use the first-side link resources to receive inter-UE coordination requests; as well as Using a second sidelink resource, an inter-UE coordination report is sent to a second UE via a sidelink interface. The second sidelink resource is selected by the first UE at least in part based on the mapping between the first sidelink resource and the second sidelink resource.

24. The method of claim 23, further comprising: Map the first side link resource to the second side link resource.

25. The method of claim 23, further comprising: The first sidelink resource is mapped to multiple sidelink resources, wherein at least a portion of the multiple sidelink resources can be used to send the inter-UE coordination report.

26. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising: One or more instructions, when executed by one or more processors of a first user equipment (UE), cause the first UE to: Use the first sidelink resources to receive inter-UE coordination requests; and Using a second sidelink resource, an inter-UE coordination report is sent to a second UE via a sidelink interface. The second sidelink resource is selected by the first UE at least in part based on the mapping between the first sidelink resource and the second sidelink resource.

27. The non-transitory computer-readable medium according to claim 26, wherein, The one or more processors are further configured to cause the first UE to map the first sidelink resource to the second sidelink resource.

28. The non-transitory computer-readable medium according to claim 26, wherein, The one or more processors are further configured to map the first sidelink resource to a plurality of sidelink resources, wherein at least a portion of the plurality of sidelink resources can be used to send the inter-UE coordination report.

29. An apparatus for wireless communication, comprising: A component used to receive inter-UE coordination requests using first-side link resources; as well as A component for sending an inter-UE coordination report to a UE via a sidelink interface using a second sidelink resource, the second sidelink resource being selected by the device at least in part based on a mapping between the first sidelink resource and the second sidelink resource.

30. The apparatus of claim 29, further comprising: A component for mapping the first sidelink resource to the second sidelink resource.

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