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WO2023004755A1 - Signalisation de coordination inter-ue - Google Patents

Signalisation de coordination inter-ue Download PDF

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Publication number
WO2023004755A1
WO2023004755A1 PCT/CN2021/109614 CN2021109614W WO2023004755A1 WO 2023004755 A1 WO2023004755 A1 WO 2023004755A1 CN 2021109614 W CN2021109614 W CN 2021109614W WO 2023004755 A1 WO2023004755 A1 WO 2023004755A1
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WO
WIPO (PCT)
Prior art keywords
sidelink
information
stage sci
sci
inter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/CN2021/109614
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English (en)
Inventor
Hui Guo
Tien Viet NGUYEN
Kapil Gulati
Sourjya Dutta
Shuanshuan Wu
Gabi Sarkis
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Qualcomm Inc
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Qualcomm Inc
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Publication date
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Priority to PCT/CN2021/109614 priority Critical patent/WO2023004755A1/fr
Publication of WO2023004755A1 publication Critical patent/WO2023004755A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • the present disclosure relates generally to communication systems, and more particularly, to sidelink communication.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • 5G New Radio is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements.
  • 3GPP Third Generation Partnership Project
  • 5G NR includes services associated with enhanced mobile broadband (eMBB) , massive machine type communications (mMTC) , and ultra-reliable low latency communications (URLLC) .
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable low latency communications
  • Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard.
  • LTE Long Term Evolution
  • Some aspects of wireless communication may comprise direct communication between devices based on sidelink. There exists a need for further improvements in sidelink technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.
  • a method, a computer-readable medium, and an apparatus are provided for wireless communication at a first user equipment (UE) .
  • the apparatus may receive sidelink reservation information from one or more UEs.
  • the apparatus may transmit second stage sidelink control information (SCI) , the second stage SCI comprising inter-UE coordination information based on the received sidelink reservation information from the one or more UEs and additional resource reservation information for the first UE, a format of the second stage SCI being indicated in a first stage SCI.
  • SCI sidelink control information
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network.
  • FIG. 2 illustrates example aspects of a sidelink slot structure.
  • FIG. 3 is a diagram illustrating an example of a first device and a second device involved in wireless communication based, e.g., on sidelink.
  • FIG. 4 illustrates example aspects of sidelink communication between devices, in accordance with aspects presented herein.
  • FIGs. 5A and 5B illustrate examples of resource reservation for sidelink communication.
  • FIG. 6 is an example time diagram for sidelink resource selection.
  • FIG. 7 illustrates an example of inter-UE coordination for sidelink communication.
  • FIGs. 8A and 8B illustrate example second stage SCI.
  • FIG. 9 is a communication flow between UEs that includes the exchange of inter-UE coordination information.
  • FIG. 10 illustrates example multi-code block second stage SCI.
  • FIG. 11 illustrates example segmentation of second stage SCI.
  • FIG. 12 is a flowchart of a method of wireless communication.
  • FIG. 13 is a diagram illustrating an example of a hardware implementation for an example apparatus.
  • a UE may perform autonomous resource selection for sidelink transmission, which may be referred to as resource allocation mode 2 for sidelink communication.
  • the UE may receive various types of information that may be used for sidelink resource selection. For example, the UE may perform sensing to receive sidelink resource reservations of other UEs. As another example, the UE may receive sidelink reservation information from one or more other UEs.
  • the sidelink reservation information may include a reservation of resources from the other UEs or may include inter-UE coordination information.
  • Inter-UE coordination information may indicate at least one of preferred resources for sidelink transmission by the UE, non-preferred resources for sidelink transmission by the UE, or resource conflict information.
  • the UE may include inter-UE coordination information based on the reservation information/inter-UE coordination information received from other UEs when transmitting its own resource reservation.
  • a payload (which may include the inter-UE coordination information and the resource reservation) transmitted by the UE may be large. Aspects presented herein enable such large payloads with a small latency by utilizing second stage SCI to carry the payload.
  • more than one code block may be configured to transmit inter-UE information with a larger payload size.
  • information bits in the payload may be divided into series of segments that may be frequency division multiplexed (FDM’ed) .
  • processors include microprocessors, microcontrollers, graphics processing units (GPUs) , central processing units (CPUs) , application processors, digital signal processors (DSPs) , reduced instruction set computing (RISC) processors, systems on a chip (SoC) , baseband processors, field programmable gate arrays (FPGAs) , programmable logic devices (PLDs) , state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionality described throughout this disclosure.
  • processors in the processing system may execute software.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise a random-access memory (RAM) , a read-only memory (ROM) , an electrically erasable programmable ROM (EEPROM) , optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the types of computer-readable media, or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • RAM random-access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable ROM
  • optical disk storage magnetic disk storage
  • magnetic disk storage other magnetic storage devices
  • combinations of the types of computer-readable media or any other medium that can be used to store computer executable code in the form of instructions or data structures that can be accessed by a computer.
  • implementations and/or uses may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (AI) -enabled devices, etc. ) . While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range a spectrum from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregate, distributed, or original equipment manufacturer (OEM) devices or systems incorporating one or more aspects of the described innovations.
  • OEM original equipment manufacturer
  • devices incorporating described aspects and features may also include additional components and features for implementation and practice of claimed and described aspect.
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor (s) , interleaver, adders/summers, etc. ) .
  • components for analog and digital purposes e.g., hardware components including antenna, RF-chains, power amplifiers, modulators, buffer, processor (s) , interleaver, adders/summers, etc.
  • innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, aggregated or disaggregated components, end-user devices, etc. of varying sizes, shapes, and constitution.
  • FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network 100.
  • the wireless communications system (also referred to as a wireless wide area network (WWAN) ) includes base stations 102, UEs 104, an Evolved Packet Core (EPC) 160, and another core network 190 (e.g., a 5G Core (5GC) ) .
  • the base stations 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station) .
  • the macrocells include base stations.
  • the small cells include femtocells, picocells, and microcells.
  • a link between a UE 104 and a base station 102 or 180 may be established as an access link, e.g., using a Uu interface. Other communication may be exchanged between wireless devices based on sidelink. For example, some UEs 104 may communicate with each other directly using a device-to-device (D2D) communication link 158. In some examples, the D2D communication link 158 may use the DL/UL WWAN spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , and a physical sidelink control channel (PSCCH) .
  • PSBCH physical sidelink broadcast channel
  • PSDCH physical sidelink discovery channel
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.
  • IEEE Institute of Electrical and Electronics Engineers
  • sidelink communication may include vehicle-based communication devices that can communicate from vehicle-to-vehicle (V2V) , vehicle-to-infrastructure (V2I) (e.g., from the vehicle-based communication device to road infrastructure nodes such as a Road Side Unit (RSU) ) , vehicle-to-network (V2N) (e.g., from the vehicle-based communication device to one or more network nodes, such as a base station) , vehicle-to-pedestrian (V2P) , cellular vehicle-to-everything (C-V2X) , and/or a combination thereof and/or with other devices, which can be collectively referred to as vehicle-to-anything (V2X) communications.
  • V2V vehicle-to-vehicle
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network
  • V2P vehicle-to-pedestrian
  • C-V2X cellular vehicle-to-everything
  • Sidelink communication may be based on V2X or other D2D communication, such as Proximity Services (ProSe) , etc.
  • sidelink communication may also be transmitted and received by other transmitting and receiving devices, such as Road Side Unit (RSU) 107, etc.
  • Sidelink communication may be exchanged using a PC5 interface, such as described in connection with the example in FIG. 2.
  • RSU Road Side Unit
  • Sidelink communication may be exchanged using a PC5 interface, such as described in connection with the example in FIG. 2.
  • the following description, including the example slot structure of FIG 2 may provide examples for sidelink communication in connection with 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.
  • a UE may receive sidelink reservation information from one or more UEs.
  • the UE 104 may include an inter-UE coordination information component 198 configured to transmit second stage SCI, the second stage SCI comprising inter-UE coordination information based on the received sidelink reservation information from the one or more UEs and additional resource reservation information for the first UE, a format of the second stage SCI being indicated in a first stage SCI.
  • the base stations 102 configured for 4G LTE may interface with the EPC 160 through first backhaul links 132 (e.g., S1 interface) .
  • the base stations 102 configured for 5G NR may interface with core network 190 through second backhaul links 184.
  • the base stations 102 may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • NAS non-access stratum
  • RAN radio access network
  • MBMS multimedia broadcast multicast service
  • RIM RAN information management
  • the base stations 102 may communicate directly or indirectly (e.g., through the EPC 160 or core network 190) with each other over third backhaul links 134 (e.g., X2 interface) .
  • the first backhaul links 132, the second backhaul links 184, and the third backhaul links 134 may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, the small cell 102′ may have a coverage area 110′ that overlaps the coverage area 110 of one or more macro base stations 102.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • eNBs Home Evolved Node Bs
  • HeNBs Home Evolved Node Bs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base stations 102 /UEs 104 may use spectrum up to YMHz (e.g., 5, 10, 15, 20, 100, 400, etc.
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell) .
  • the wireless communications system may further include a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 via communication links 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • AP Wi-Fi access point
  • STAs Wi-Fi stations
  • communication links 154 e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • the STAs 152 /AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • the small cell 102′ may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102′ may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP 150. The small cell 102′, employing NR in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • the small cell 102′ may employ NR and use the same unlicensed frequency spectrum (e.g., 5 GHz, or the like) as used by the Wi-Fi AP 150.
  • the small cell 102′, employing NR in an unlicensed frequency spectrum may boost coverage to and/or increase capacity of the access network.
  • FR1 frequency range designations FR1 (410 MHz -7.125 GHz) and FR2 (24.25 GHz -52.6 GHz) . Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in various documents and articles.
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz -300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • FR3 7.125 GHz -24.25 GHz
  • FR3 7.125 GHz -24.25 GHz
  • FR4a or FR4-1 52.6 GHz -71 GHz
  • FR4 52.6 GHz-114.25 GHz
  • FR5 114.25 GHz-300 GHz
  • sub-6 GHz or the like ifused herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.
  • a base station 102 may include and/or be referred to as an eNB, gNodeB (gNB) , or another type of base station.
  • Some base stations, such as gNB 180 may operate in a traditional sub 6 GHz spectrum, in millimeter wave frequencies, and/or near millimeter wave frequencies in communication with the UE 104.
  • the gNB 180 may be referred to as a millimeter wave base station.
  • the millimeter wave base station 180 may utilize beamforming 182 with the UE 104 to compensate for the path loss and short range.
  • the base station 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate the beamforming. Similarly, beamforming may be applied for sidelink communication, e.g., between UEs.
  • the base station 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182′.
  • the UE 104 may receive the beamformed signal from the base station 180 in one or more receive directions 182′′.
  • the UE 104 may also transmit a beamformed signal to the base station 180 in one or more transmit directions.
  • the base station 180 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 180 /UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 180 /UE 104.
  • the transmit and receive directions for the base station 180 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172.
  • MME Mobility Management Entity
  • MBMS Multimedia Broadcast Multicast Service
  • BM-SC Broadcast Multicast Service Center
  • PDN Packet Data Network
  • the MME 162 may be in communication with a Home Subscriber Server (HSS) 174.
  • HSS Home Subscriber Server
  • the MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160.
  • the MME 162 provides bearer and connection management. All user Intemet protocol (IP) packets are transferred through the Serving Gateway 166, which itself is connected to the PDN Gateway 172.
  • IP Intemet protocol
  • the PDN Gateway 172 provides UE IP address allocation as well as other functions.
  • the PDN Gateway 172 and the BM-SC 170 are connected to the IP Services 176.
  • the IP Services 176 may include the Intemet, an intranet, an IP Multimedia Subsystem (IMS) , a PS Streaming Service, and/or other IP services.
  • the BM-SC 170 may provide functions for MBMS user service provisioning and delivery.
  • the BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and may be used to schedule MBMS transmissions.
  • PLMN public land mobile network
  • the MBMS Gateway 168 may be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and may be responsible for session management (start/stop) and for collecting eMBMS related charging information.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the core network 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195.
  • the AMF 192 may be in communication with a Unified Data Management (UDM) 196.
  • the AMF 192 is the control node that processes the signaling between the UEs 104 and the core network 190.
  • the AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are transferred through the UPF 195.
  • the UPF 195 provides UE IP address allocation as well as other functions.
  • the UPF 195 is connected to the IP Services 197.
  • the IP Services 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a Packet Switch (PS) Streaming (PSS) Service, and/or other IP services.
  • IMS IP Multimedia Subsystem
  • PS Packet Switch
  • PSS Packet
  • the base station may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS) , an extended service set (ESS) , a transmit reception point (TRP) , or some other suitable terminology.
  • the base station 102 provides an access point to the EPC 160 or core network 190 for a UE 104.
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA) , a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player) , a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • Some of the UEs 104 may be referred to as IoT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc. ) .
  • the UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network.
  • FIG. 2 includes diagrams 200 and 210 illustrating example aspects of slot structures that may be used for sidelink communication (e.g., between UEs 104, RSU 107, etc. ) .
  • the slot structure may be within a 5G/NR frame structure in some examples. In other examples, the slot structure may be within an LTE frame structure. Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.
  • the example slot structure in FIG. 2 is merely one example, and other sidelink communication may have a different frame structure and/or different channels for sidelink communication.
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms) .
  • Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols.
  • Diagram 200 illustrates a single resource block of a single slot transmission, e.g., which may correspond to a 0.5 ms transmission time interval (TTI) .
  • a physical sidelink control channel may be configured to occupy multiple physical resource blocks (PRBs) , e.g., 10, 12, 15, 20, or 25 PRBs.
  • the physical sidelink shared channel (PSSCH) may be limited to a single sub-channel.
  • a PSCCH duration may be configured to be 2 symbols or 3 symbols, for example.
  • a sub-channel may comprise 10, 15, 20, 25, 50, 75, or 100 PRBs, for example.
  • the resources for a sidelink transmission may be selected from a resource pool including one or more subchannels.
  • the resource pool may include between 1-27 subchannels.
  • a PSCCH size may be established for a resource pool, e.g., as between 10-100 %of one subchannel for a duration of 2 symbols or 3 symbols.
  • the diagram 210 in FIG. 2 illustrates an example in which the PSCCH occupies about 50%of a subchannel, as one example to illustrate the concept of PSCCH occupying a portion of a subchannel.
  • the PSSCH occupies at least one subchannel.
  • the PSCCH may include a first portion of sidelink control information (SCI)
  • the PSSCH may include a second portion of SCI in some examples.
  • a resource grid may be used to represent the frame structure.
  • Each time slot may include a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends 12 consecutive subcarriers.
  • the resource grid is divided into multiple resource elements (REs) .
  • the number of bits carried by each RE depends on the modulation scheme.
  • some of the REs may include control information in PSCCH and some REs may include demodulation RS (DMRS) .
  • DMRS demodulation RS
  • At least one symbol may be used for feedback.
  • FIG. 2 illustrates examples with two symbols for a physical sidelink feedback channel (PSFCH) with adjacent gap symbols. A symbol prior to and/or after the feedback may be used for turnaround between reception of data and transmission of the feedback.
  • PSFCH physical sidelink feedback channel
  • the gap enables a device to switch from operating as a transmitting device to prepare to operate as a receiving device, e.g., in the following slot.
  • Data may be transmitted in the remaining REs, as illustrated.
  • the data may comprise the data message described herein.
  • the position of any of the data, DMRS, SCI, feedback, gap symbols, and/or LBT symbols may be different than the example illustrated in FIG. 2.
  • Multiple slots may be aggregated together in some aspects.
  • FIG. 3 is a block diagram of a first wireless communication device 310 in communication with a second wireless communication device 350 based on sidelink.
  • the devices 310 and 350 may communicate based on V2X or other D2D communication. The communication may be based on sidelink using a PC5 interface.
  • the devices 310 and the 350 may comprise a UE, an RSU, a base station, etc. Packets may be provided to a controller/processor 375 that implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions.
  • Layer 1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the TX processor 316 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the coded and modulated symbols may then be split into parallel streams.
  • Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • IFFT Inverse Fast Fourier Transform
  • the OFDM stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator 374 may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the device 350.
  • Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX.
  • Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.
  • each receiver 354RX receives a signal through its respective antenna 352.
  • Each receiver 354RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the device 350. If multiple spatial streams are destined for the device 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT) .
  • FFT Fast Fourier Transform
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • the symbols on each subcarrier, and the reference signal, are recovered and demodulated by determining the most likely signal constellation points transmitted by device 310. These soft decisions may be based on channel estimates computed by the channel estimator 358.
  • the soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by device 310 on the physical channel.
  • the data and control signals are then provided to the controller/processor 359, which implements layer 3 and layer 2 functionality.
  • the controller/processor 359 can be associated with a memory 360 that stores program codes and data.
  • the memory 360 may be referred to as a computer-readable medium.
  • the controller/processor 359 may provide demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing.
  • the controller/processor 359 is also responsible for error detection using an acknowledgment (ACK) and/or negative ACK (NACK) protocol to support hybrid automatic repeat request (HARQ) operations.
  • ACK acknowledgment
  • NACK negative ACK
  • the controller/processor 359 may provide RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression /decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and
  • Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by device 310 may be used by the TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the TX processor 368 may be provided to different antenna 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.
  • Each receiver 318RX receives a signal through its respective antenna 320.
  • Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • the controller/processor 375 can be associated with a memory 376 that stores program codes and data.
  • the memory 376 may be referred to as a computer-readable medium.
  • the controller/processor 375 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing.
  • the controller/processor 375 is also responsible for error detection using an ACK and/or NACK protocol to support HARQ operations.
  • At least one of the TX processor 368/316, the RX processor 356/370, and the controller/processor 359/375 may be configured to perform aspects in connection with the inter-UE coordination information component 198 of FIG. 1.
  • FIG. 4 illustrates an example 400 of sidelink communication between devices.
  • the communication may be based on a slot structure comprising aspects described in connection with FIG. 2.
  • the UE 402 may transmit a sidelink transmission 414, e.g., comprising a control channel (e.g., PSCCH) and/or a corresponding data channel (e.g., PSSCH) , that may be received by UEs 404, 406, 408.
  • a control channel may include information (e.g., sidelink control information (SCI) ) for decoding the data channel including reservation information, such as information about time and/or frequency resources that are reserved for the data channel transmission.
  • SCI sidelink control information
  • the SCI may indicate a number of TTIs, as well as the RBs that will be occupied by the data transmission.
  • the SCI may also be used by receiving devices to avoid interference by refraining from transmitting on the reserved resources.
  • the UEs 402, 404, 406, 408 may each be capable of sidelink transmission in addition to sidelink reception. Thus, UEs 404, 406, 408 are illustrated as transmitting sidelink transmissions 413, 415, 416, 420.
  • the sidelink transmissions 413, 414, 415, 416, 420 may be unicast, broadcast or multicast to nearby devices.
  • UE 404 may transmit communication 413, 415 intended for receipt by other UEs within a range 401 of UE 404, and UE 406 may transmit communication 416.
  • RSU 407 may receive communication from and/or transmit communication 418 to UEs 402, 404, 406, 408.
  • One or more of the UEs 402, 404, 406, 408 or the RSU 407 may comprise an inter-UE coordination information component 198.
  • Sidelink communication may be based on different types or modes of resource allocation mechanisms.
  • a first resource allocation mode (which may be referred to herein as “Mode 1” )
  • centralized resource allocation may be provided by a network entity.
  • a base station 102 or 180 may determine resources for sidelink communication and may allocate resources to different UEs 104 to use for sidelink transmissions.
  • a UE receives the allocation of sidelink resources from the base station 102 or 180.
  • a second resource allocation mode (which may be referred to herein as “Mode 2” )
  • Mode 2 each UE may autonomously determine resources to use for sidelink transmission.
  • each UE may use a sensing technique to monitor for resource reservations by other sidelink UEs and may select resources for sidelink transmissions from unreserved resources.
  • Devices communicating based on sidelink may determine one or more radio resources in the time and frequency domain that are used by other devices in order to select transmission resources that avoid collisions with other devices.
  • the sidelink transmission and/or the resource reservation may be periodic or aperiodic, where a UE may reserve resources for transmission in a current slot and up to two future slots (discussed below) .
  • individual UEs may autonomously select resources for sidelink transmission, e.g., without a central entity such as a base station indicating the resources for the device.
  • a first UE may reserve the selected resources in order to inform other UEs about the resources that the first UE intends to use for sidelink transmission (s) .
  • the resource selection for sidelink communication may be based on a sensing-based mechanism. For instance, before selecting a resource for a data transmission, a UE may first determine whether resources have been reserved by other UEs.
  • the UE may determine (e.g., sense) whether the selected sidelink resource has been reserved by other UE (s) before selecting a sidelink resource for a data transmission. If the UE determines that the sidelink resource has not been reserved by other UEs, the UE may use the selected sidelink resource for transmitting the data, e.g., in a PSSCH transmission.
  • the UE may estimate or determine which radio resources (e.g., sidelink resources) may be in-use and/or reserved by others by detecting and decoding sidelink control information (SCI) transmitted by other UEs.
  • SCI sidelink control information
  • the UE may use a sensing-based resource selection algorithm to estimate or determine which radio resources are in-use and/or reserved by others.
  • the UE may receive SCI from another UE that includes reservation information based on a resource reservation field comprised in the SCI.
  • the UE may continuously monitor for (e.g., sense) and decode SCI from peer UEs.
  • the SCI may include reservation information, e.g., indicating slots and RBs that a particular UE has selected for a future transmission.
  • the UE may exclude resources that are used and/or reserved by other UEs from a set of candidate resources for sidelink transmission by the UE, and the UE may select/reserve resources for a sidelink transmission from the resources that are unused and therefore form the set of candidate resources.
  • the UE may continuously perform sensing for SCI with resource reservations in order to maintain a set of candidate resources from which the UE may select one or more resources for a sidelink transmission. Once the UE selects a candidate resource, the UE may transmit SCI indicating its own reservation of the resource for a sidelink transmission.
  • the number of resources (e.g., sub-channels per subframe) reserved by the UE may depend on the size of data to be transmitted by the UE. Although the example is described for a UE receiving reservations from another UE, the reservations may also be received from an RSU or other device communicating based on sidelink.
  • FIG. 5A illustrates an example 500 of time and frequency resources showing aperiodic reservations for sidelink transmissions.
  • FIG. 5B illustrates an example 525 of periodic reservations for sidelink transmissions.
  • the resources may be comprised in a sidelink resource pool, for example.
  • the resource allocation for each UE may be in units of one or more sub-channels in the frequency domain (e.g., sub-channels SC1 to SC 4) , and may be based on one slot in the time domain.
  • the UE may also use resources in the current slot to perform an initial transmission, and may reserve resources in future slots for retransmissions. In this example, two different future slots are being reserved by UE1 and UE2 for retransmissions.
  • the resource reservation may be limited to a window of time or slots.
  • the initial candidate set of potential resources for a sidelink transmission may include 8 slots by 4 sub-channels, which provides 32 available resource blocks in total. This window may also be referred to as a resource selection window.
  • a first UE may reserve a sub-channel (e.g., SC 1) in a current slot (e.g., slot 1) for its initial data transmission 502, and may reserve additional future slots within the window for data retransmissions (e.g., 504 and 506) .
  • SC 1 may reserve sub-channels SC 3 at slots 3 and SC 2 at slot 4 for future retransmissions as shown by FIG. 4.
  • UE1 transmits information regarding which resources are being used and/or reserved by it to other UE (s) .
  • UE1 may do by including the reservation information in the reservation resource field of the SCI, e.g., a first stage SCI.
  • FIG. 5A illustrates that a second UE ( “UE2” ) reserves resources in sub-channels SC 3 and SC 4 at time slot 1 for its current data transmission 508, and reserve first data retransmission 510 at time slot 4 using sub-channels SC 3 and SC 4, and reserve second data retransmission 512 at time slot 7 using sub-channels SC 1 and SC 2 as shown by FIG. 5A.
  • UE2 may transmit the resource usage and reservation information to other UE (s) , such as using the reservation resource field in SCI.
  • a third UE may consider resources reserved by other UEs within the resource selection window to select resources to transmit its data.
  • the third UE may first decode SCIs within a time period to identify which resources are available (e.g., candidate resources) .
  • the third UE may exclude the resources reserved by UE1 and UE2 and may select other available sub-channels and time slots from the candidate resources for its transmission and retransmissions, which may be based on a number of adjacent sub-channels in which the data (e.g., packet) to be transmitted can fit.
  • FIG. 5A illustrates resources being reserved for an initial transmission and two retransmissions
  • the reservation may be for an initial transmission and a single transmission or only for an initial transmission.
  • FIG. 5B illustrates an example 525 of a periodic resource reservation.
  • Periodic resource reservation and signaling may be disabled by configuration.
  • a period, with configurable values, may be signaled in SCI.
  • a period may have a value between 0 ms and 1000 ms.
  • Sidelink resources may be reserved periodically, such as for SPS resources.
  • initial transmissions of a subsequent period in an SPS flow may be protected by an earlier SPS transmission.
  • FIG. 5B illustrates an initial transmission may indication a resource reservation, e.g., at 526, for the SPS resources.
  • the UE may determine an associated signal measurement (such as RSRP) for each resource reservation received by another UE.
  • the UE may consider resources reserved in a transmission for which the UE measures an RSRP below a threshold to be available for use by the UE.
  • a UE may perform signal/channel measurement for a sidelink resource that has been reserved and/or used by other UE (s) , such as by measuring the RSRP of the message (e.g., the SCI) that reserves the sidelink resource. Based at least in part on the signal/channel measurement, the UE may consider using/reusing the sidelink resource that has been reserved by other UE (s) .
  • the UE may exclude the reserved resources from a candidate resource set if the measured RSRP meets or exceeds the threshold, and the UE may consider a reserved resource to be available if the measured RSRP for the message reserving the resource is below the threshold.
  • the UE may include the resources in the candidate resources set and may use/reuse such reserved resources when the message reserving the resources has an RSRP below the threshold, because the low RSRP indicates that the other UE is potentially distant and a reuse of the resources is less likely to cause interference to that UE.
  • a higher RSRP indicates that the transmitting UE that reserved the resources is potentially closer to the UE and may experience higher levels of interference if the UE selected the same resources.
  • the UE may determine a set of candidate resources (e.g., by monitoring SCI from other UEs and removing resources from the set of candidate resources that are reserved by other UEs in a signal for which the UE measures an RSRP above a threshold value) .
  • the UE may select N resources for transmissions and/or retransmissions of a TB.
  • the UE may randomly select the N resources from the set of candidate resources determined in the first step.
  • the UE may reserve future time and frequency resources for an initial transmission and up to two retransmissions.
  • the UE may reserve the resources by transmitting SCI indicating the resource reservation. For example, in the example in FIG. 5A, the UE may transmit SCI reserving resources for data transmissions 508, 510, and 512.
  • the UE may sense and decode the SCI received from other UEs during a sensing window, e.g., a time duration prior to resource selection. Based on the sensing history during the sensing window, the UE may be able to maintain a set of available candidate resources by excluding resources that are reserved by other UEs from the set of candidate resources.
  • a UE may select resources from its set of available candidate resources and transmits SCI reserving the selected resources for sidelink transmission (e.g., a PSSCH transmission) by the UE.
  • FIG. 6 illustrates an example timeline 600 for sidelink resource selection based on sensing.
  • the UE may receive sidelink transmission 610 and sidelink transmission 612 during the sensing window 602.
  • FIG. 6 illustrates an example sensing window including 8 consecutive time slots and 4 consecutive sub-channels, which spans 32 resource blocks.
  • the sidelink transmission 610 indicates a resource reservation for resource 618
  • sidelink transmission 612 indicates a resource reservation for resources 614 and 622.
  • the sidelink transmissions 610 and 612 may each include SCI that indicates the corresponding resource reservation.
  • Resource reservations may be periodic or aperiodic. Different reservations of resources may have different priority levels, e.g., with the priority level indicated in the SCI.
  • a UE receiving the transmissions 610 and 612 may exclude the resources 614, 616, and 618 as candidate resources in a candidate resource set based on the resource selection window 606.
  • the sidelink device may exclude the resources 614, 616, or 618 based on whether a measured RSRP for the received SCI (e.g., in 610 or 612) meets a threshold.
  • a resource selection trigger occurs at 604, such as the sidelink device having a packet for sidelink transmission
  • the sidelink device may select resources for the sidelink transmission (e.g., including PSCCH and/or PSSCH) from the remaining resources of the resource pool within the resource selection window 606 after the exclusion of the reserved resources (e.g., 614, 616, and 618) .
  • FIG. 6 illustrates an example in which the sidelink device selects the resource 620 for sidelink transmission.
  • the sidelink device may also select resources 622 and/or 624 for a possible retransmission. After selecting the resources for transmission, the sidelink device may transmit SCI indicating a reservation of the selected resources.
  • each sidelink device may use the sensing/reservation procedure to select resources for sidelink transmissions from the available candidate resources that have not been reserved by other sidelink devices
  • multiple UEs may transmit at the same time and may not receive the overlapping communication (e.g., SCI indicating resource reservations) from each other and/or from a base station.
  • a UE may miss or be unaware of transmissions and sidelink reservations by other UEs. Therefore, two UEs may reserve the same resource block for a future sidelink transmission, which may result in a resource collision.
  • a resource collision occurs for sidelink transmissions that overlap at least partially in time, and which may overlap, at least partially, in frequency.
  • FIG. 7 is a diagram 700 illustrating the exchange of inter-UE coordination information, where a first UE ( “UE-A” ) 702 transmits inter-UE coordination information 706 to a second UE ( “UE-B” ) 704.
  • the UE-A 702 may also transmit the inter-UE coordination information 706 to one or more other UEs in a same group or sub-group as the UE-A 702 and the UE-B 704.
  • the transmission of inter-UE coordination information may include resource reservation forwarding by the UE-A.
  • the inter-UE coordination information 706 may include information based on the UE’s sensing information (e.g., resource reservations of other UEs that are sensed by UE 702 (e.g., UE-A) ) , inter-UE coordination information from another UE, resources that are bad, undesirable, or non-preferred for the UE-A 702 (e.g., resources subject to high interference or resources that are indicated as non-preferred for the UE-A 702) , resources which are preferred or better than other resources for the UE-A 702, etc.
  • sensing information e.g., resource reservations of other UEs that are sensed by UE 702 (e.g., UE-A)
  • inter-UE coordination information from another UE e.g., resources that are bad, undesirable, or non-preferred for the UE-A 702 (e.g., resources subject to high interference or resources that are indicated as non-preferred for the UE-A 702) , resources which are preferred or better than other resources
  • the resources that are non-preferred for the UE-A 702 may be indicated by another UE and determined based on one or more of: 1) the UE’s sensing results or SCI decoding or measurement result; 2) the UE’s SL resources selected for multiple transmissions of different TBs; or 3) the UE’s configured or scheduled resources for UL.
  • the inter-UE coordination information 706 may indicate candidate resources for sidelink transmission or preferred resources for transmissions by UE-B 704.
  • the indication of preferred resources for UE-B’s transmission may be referred to as “Type A” inter-UE coordination information.
  • the UE-A 702 may use the inter-UE coordination information 706 to inform the UE-B 704 about which sub-channels and slots may be used for communicating with the UE-A 702 and/or which sub-channels and slots may not be used because they are occupied or reserved by the UE-A 702 and/or other UEs.
  • the UE-A may indicate a set of resources that may be more suitable for UE-B’s transmission based on UE-A’s evaluation.
  • the candidate resources may indicate a group of resources from which the UE-B 704 (e.g., UE-B) may select for the sidelink transmission 708.
  • the sidelink transmission 708 may be for UE-A 702 or for one or more different UEs, e.g., UE-C 710.
  • the UE-A may be a potential receiver of the UE-B’s transmission
  • the inter-UE coordination information may enable mode 2 resource allocation that is based on resource availability from a potential receiver’s perspective, which may address reception challenges for a hidden node.
  • the inter-UE coordination information 706 may indicate resources for a sidelink transmission, e.g., particular resources on which the UE-B 704 is to transmit the sidelink transmission 708 rather than candidate resources that the UE-B 704 may select.
  • the inter-UE coordination information 706 may indicate a set of resources that may not be preferred for UE-B’s transmission, such as resources that may not be available for UE-B to transmit a sidelink transmission based on the UE-A’s evaluation.
  • the indication of non-preferred resources for UE-B’s transmission may be referred to as “Type B” inter-UE coordination information.
  • the UE-A 702 may determine resources that are non-preferred based on one or more of: 1) UE-A 702’s sensing result; 2) UE-A 702’s SL resources selected for multiple transmissions of different TBs; or 3) UE-A 702’s configured or scheduled resources for UL.
  • the inter-UE coordination information 706 may indicate a half-duplex conflict.
  • the inter-UE coordination information 706 may indicate a collision in time and/or frequency for two transmitting UEs that are unable to receive the other, respective transmission in a half-duplex mode.
  • the inter-UE coordination information 706 may indicate a collision of resources (e.g., reserved resources) in time and/or frequency.
  • the indication of a collision/conflict in resources may be referred to as “Type C” inter-UE coordination information.
  • the UE-B 704 may make a better decision on which resources to use and/or reserve for its sidelink transmission 708 to avoid resource collisions.
  • the UE-A 702 may share its inter-UE coordination information 706 with multiple UEs, and the UE-B 704 may receive the inter-UE coordination information 706 from multiple UEs.
  • Inter-UE coordination information 706 may be transmitted in any of various ways.
  • the UE-A 702 may transmit inter-UE coordination information 706 in a PSFCH, e.g., indicating a resource collision or a half-duplex conflict indication.
  • the UE-A 702 may transmit inter-UE coordination information 706 in SCI.
  • the UE-A 702 may transmit shared sensing information, candidate resource information for a sidelink transmission, or particular resources for a sidelink transmission in SCI-2 transmitted in PSSCH.
  • a first portion of SCI (e.g., SCI-l) may be transmitted in PSCCH, and a second portion of SCI (e.g., SCI-2) may be transmitted in PSSCH.
  • the UE-A 702 may transmit inter-UE coordination information 706 in a MAC-CE, e.g., on the PSSCH.
  • the UE-A 702 may transmit the inter-UE coordination information 706 in a new physical channel (e.g., that is different than PSCCH, PSSCH, PSFCH, etc. ) .
  • the UE-A 702 may transmit the inter-UE coordination information 706 in a physical channel that is configured for or dedicated to inter-UE configuration information.
  • the UE-A 702 may transmit the inter-UE coordination information 706 in RRC signaling.
  • the UE-A 702 may transmit the inter-UE coordination information 706 periodically. In some aspects, the UE-A 702 may transmit aperiodic inter-UE coordination information 706 in response to a trigger.
  • the trigger may be based on the occurrence of an event, such as the occurrence of/detection of a resource collision, the occurrence of/detection of a half-duplex conflict, etc. For example, if the UE-A 702 detects a resource collision, the UE-A 702 may respond by transmitting inter-UE coordination information 706.
  • the coordination information 706 sent from UE-A 702 to UE-B 704 is the set of resources preferred and/or non-preferred for UE-B’s transmission 708.
  • the inter-UE coordination information 706 may include additional information other than indicating time/frequency of the resources within the set in the coordination information.
  • the inter-UE coordination information 706 from UE-A 702 to UE-B 704 indicates the presence of an expected/potential and/or detected resource conflict on the resources indicated by an SCI from UE-B 704.
  • the UE-B 704 may utilize the inter-UE coordination information 706 in various ways.
  • the UE-B 704 may select resource (s) to be used for its sidelink transmission resource selection, or resource re-selection, may be based on both UE-B’s sensing result (if available) and the received inter-UE coordination information 706 according to a first option.
  • the UE-B 704 may select resource (s) to be used for its sidelink transmission resource selection, or resource re-selection, may be based on the received inter-UE coordination information 706 and not based on sensing.
  • the UE-B 704 may select resource (s) to be used for its sidelink transmission resource selection, or resource re-selection, may be based on the received inter-UE coordination information 706 (which may allow the UE-B to use or not use sensing in combination with the inter-UE coordination information 706)
  • the UE-B 704 may determine resources to be re-selected based on the received inter-UE coordination information 706. The UE-B 704 may determine whether to perform a retransmission based on the received inter-UE coordination information 706. In some aspects, the UE-B 704 may use sensing information in combination with the inter-UE coordination information 706 to determine resources to be re-selected and/or to determine whether to perform a retransmission.
  • the coordination information that is sent from UE-A to UE-B may include the set of resources that are preferred or non-preferred for the UE-B’s transmission. Down selection may be performed between the preferred resource set and the non-preferred resource set.
  • the inter-UE coordination information may indicate a time/frequency of the resources within the set and may further include additional information.
  • the coordination information that is sent from the UE-A to the UE-B may include the presence of expected/potential and/or detected resource conflicts on the resources indicated by SCI from the UE-B.
  • down-selection may be performed between the expected/potential conflict and the detected resource conflict.
  • the UE-A that transmits the inter-UE coordination information to the UE-B may be a particular UE, such as an intended receiver ofUE-B.
  • any UE may transmit inter-UE coordination information.
  • a UE may be configured, such as in a higher-layer configuration, to transmit inter-UE coordination information.
  • a UE’s reservation of resources for its own transmission may be referred to as a self-reservation.
  • a self-reservation may correspond to resources that the UE has selected but not yet signaled through a first transmission of an aperiodic transmission or a first SPS transmission.
  • Information about reservations from other sidelink transmitters can be transmitted along with a UE’s self-reservation.
  • the inclusion of the sidelink reservation information from other UEs, including inter-UE coordination information, may be referred to as “piggy backing” the information with the UE’s self-reservation.
  • the resource reservation forwarding may help to protect unreserved initial transmissions. For example, the UE may send the self-reservation when it has resources selected but not signaled.
  • each UE may announce its self-reservation.
  • the self-reservation transmissions may collide with each other, and information may not be received by other UEs.
  • One or more of the UEs (and in some examples, each UE) may include (piggyback or retransmit) reservations from other nearby UEs when transmitting their self-reservation.
  • the inclusion, or forwarding, of reservation information from nearby UEs in the self-reservation helps to ensure that each UE receives the reservations of nearby UEs.
  • the first transmission may be protected by the reservation, and the packet reception rate may be improved.
  • a payload carrying the inter-UE coordination information may be large.
  • a UE may transmit inter-UE coordination information via either radio resource control (RRC) , medium access control (MAC) control elements (MAC-CE) , or sidelink control information (SCI) , such as second stage SCI.
  • RRC radio resource control
  • MAC medium access control
  • SCI sidelink control information
  • a SCI may include a first stage SCI and a second stage SCI.
  • the first-stage SCI may be carried on PSCCH and contains information to enable sensing operations, as well as information about the resource allocation of the PSSCH.
  • the second stage SCI may be transmitted via PSSCH.
  • the second-stage SCI may carry information to identify and decode the associated sidelink shared channel (SL-SCH) , as well as control for HARQ procedures, and triggers for CSI feedback, or the like.
  • the SL-SCH may carry the TB of data for transmission over SL.
  • the resources in which PSSCH is transmitted may be scheduled or configured by a base station or determined through a sensing procedure conducted autonomously by the transmitting UE.
  • Example 800 of FIG. 8A and example 850 of FIG. 8B illustrate example second stage SCI, which may be referred to as SCI-2.
  • the second stage SCI may be mapped to contiguous RBs in PSSCH starting from the first symbol associated with PSSCH DM-RS.
  • a format of the second stage SCI may be indicated in the first stage SCI.
  • the first stage SCI may be referred to as SCI-1, and may be transmitted in PSCCH.
  • a number of resource elements (REs) may be derived based on the first stage SCI.
  • a starting location of the second stage SCI may be defined and known to a UE. In some aspects, a UE may not blindly decode second stage SCI.
  • a second stage SCI format may include one or more of a HARQ process identifier (ID) , a new data indicator (NDI) , a source ID, a destination ID, a CSI report trigger, or the like.
  • ID HARQ process identifier
  • NDI new data indicator
  • a second stage SCI format associated with a groupcast may also include a zone ID indicating a location of a transmitter and a communication range for sending feedback.
  • RRC signaling may be applicable to unicast without being applicable to groupcast.
  • MAC-CE signaling may also be associated with a larger delay than SCI, such as a delay of about 3 ms.
  • Second stage SCI may be transmitted with a smaller delay than RRC signaling or a MAC-CE, such as a delay of one TTI.
  • SCI may be associated with a payload size constraint.
  • Example aspects in the present disclosure provided herein enable low-delay transmission of inter-UE coordination information including self-reservation or scheduling information for multiple UEs utilizing second stage SCI.
  • Example aspects provided herein enable the inter-UE coordination information including self-reservation or scheduling information for multiple UEs, which may carry more bits than the payload size constraint associated with a second stage SCI, to be transmitted via second stage SCI.
  • Such transmission of larger sized inter-UE coordination information, including self-reservation or scheduling information for multiple UEs, utilizing second stage SCI may reduce delay and may improve reliability of sidelink communications.
  • FIG. 9 illustrates an example communication flow 900 including transmitting ofinter-UE coordination information for sidelink communication.
  • the UE 902 may correspond to the UE-A 702 in FIG. 7, and the UE 904 may correspond to the UE-B in FIG. 7.
  • the UE 902 may perform sensing for sidelink resource reservations.
  • the sensing may include aspects described in connection with any of FIGs. 5A, 5B, or 6.
  • the UE 902 may transmit sidelink reservation information 924, which may include inter-UE coordination information Type B, to the UE 904, UE 908, and UE 912.
  • the sidelink reservation information 924 may include non-preferred resources determined by the UE 902.
  • the UE 902 may determine resources that are non-preferred based on one or more of: 1) UE 902’s sensing result based on the sensing at 922; 2) UE 902’s SL resources selected for multiple transmissions of different TBs; or 3) UE 902’s configured or scheduled resources for uplink, such as scheduled resources for communicating with a network 906.
  • the UE 902 may transmit the sidelink reservation information for its own sidelink transmissions, such as periodic or aperiodic sidelink transmissions.
  • the UE 902 may transmit the sidelink reservation information for another UE’s sidelink transmission.
  • the UE 904 may transmit sidelink reservation information 928 to the UE 902, the UE 908, and the UE 912.
  • the sidelink reservation information 928 may indicate non-preferred resources.
  • the UE 904 may determine resources that are non-preferred based on one or more of: 1) UE 904’s sensing result based on the sensing at 926; 2) UE 904’s SL resources selected for multiple transmissions of different TBs; or 3) UE 904’s configured or scheduled resources for uplink, such as scheduled resources for communicating with a network 906.
  • the sidelink reservation information 928 may be piggybacked and may further include information in the sidelink reservation information 924.
  • the UE 908 may transmit sidelink reservation information 930 to the UE 902, the UE 904, and the UE 912.
  • the sidelink reservation information 930 may indicate non-preferred resources.
  • the UE 908 may determine resources that are non-preferred based on one or more of: 1) UE 908’s sensing result based on the sensing at 926; 2) UE 908’s SL resources selected for multiple transmissions of different TBs; or 3) UE 908’s configured or scheduled resources for uplink, such as scheduled resources for communicating with a network 906.
  • the sidelink reservation information 930 may be piggybacked and may further include information in the sidelink reservation information 924 and the sidelink reservation information 928.
  • one or more of the UE 904, the UE 908, and the UE 912 may also perform sensing at 926.
  • the UE 904 may transmit reservation information 968 to the UE 902 and the UE 908 may transmit reservation information 960 to the UE 902.
  • the reservation information 968 and the reservation information 960 may include scheduling information or preferred resources for the UE 908 and the UE 904.
  • the reservation information 968 and the reservation information 960 may be inter-UE coordination information Type A.
  • the UE 902 may be a centralized scheduling UE scheduling sidelink transmission for the UE 904 and the UE 908 and may transmit the reservation information 978 and the reservation information 970 to the UE 904 and the UE 908.
  • the second stage SCI may be used for transmitting the sidelink reservation information 924, the sidelink reservation information 928, the sidelink reservation information 930, or the reservation information 968 and the reservation information 960.
  • the second stage SCI may have a maximum payload size of 144 bits.
  • more than one code block may be configured to transmit an inter-UE coordination forwarding message with long payload size, such as the sidelink reservation information 924, the sidelink reservation information 928, the sidelink reservation information 930, the reservation information 968, or the reservation information 960.
  • a SCI format 2-C may be used to support 1 code block inter-UE coordination message transmission (when payload is not very large)
  • SCI format 2-D may be used to support 2 code blocks inter-UE coordination message transmission.
  • SCI format 2-C may be used to support two code block inter-UE coordination message transmission by default.
  • a set of cyclic redundancy check (CRC) bits may be applied for each code block and another set of CRC bits may be applied over all the code blocks.
  • CRC cyclic redundancy check
  • FIG. 10 is an example 1000 illustrating example multi-code block second stage SCI. As illustrated in FIG. 10, second stage SCI 1002 may be associated with a first code block and second stage SCI 1004 may be associated with a second code block.
  • information bits in the sidelink reservation information 924, the sidelink reservation information 928, the sidelink reservation information 930, the reservation information 968, or the reservation information 960 may be segmented.
  • a UE may transmit each segmentation in multiple sub-channels can be supported.
  • a UE may transmit self reservation information and forward other transmitters’ resource reservation information.
  • More than 144 bits may be included in the inter-UE coordination payload transmitted using second stage SCI with a maximum payload size of 144 bits.
  • the information bits may be divided into series of segments with equal size.
  • FIG. 11 is an example 1100 illustrating example segmentation of second stage SCI. As illustrated in FIG.
  • a first segment 1102 may be associated with a first sub-channel and a second segment may be associated with a second sub-channel.
  • the segment size of each segment may be fixed and one type of second stage SCI format may be used.
  • Each segment may be padded using zero or more padding bits. In one example, the last segment may be padded. For example, if the information bits to be carried is 200 bits, the first segment 1102 may carry 144 information bits and the segment 1104 may carry 56 information bits. The segment 1104 may be padded with 88 zero bits. In another example, all segments may be equally padded. For example, ifthe information bits to be carried is 200 bits, the first segment 1102 and the second segment 1104 may both carry 100 bits and may be both padded with 44 zero bits.
  • the segment 1102 and the segment 1104 may be self-contained.
  • Type B inter-UE coordination information ifbit map is transmitted, different portion of the bit map is sent on different segment, each segment has information about window size, and start location offset of the portion of bit map in the segment.
  • For Type A inter-UE coordination information every scheduling information to each UE may be fit entirely in a segment.
  • Each message carrying the sidelink reservation information 924, the sidelink reservation information 928, the sidelink reservation information 930, the reservation information 968, or the reservation information 960 may carry a number of segments and associated segment IDs.
  • the segments may be transmitted in a same slot and may be FDM’ed.
  • consecutive subchannels may be used to transmit the segments.
  • the order of segments in the used subchannel may be fixed.
  • a first sub-channel may be used to transmit a first segment
  • a second sub-channel may be used to transmit a second segment, or the like.
  • each sub-channel may be associated with its own first stage SCI and the second stage SCI carrying the segment may span the entire sub-channel.
  • the first stage SCI in a i-th sub-channel may reserve either the i-th subchannel or reserve sub-channel i to n, reserving multiple sub-channels.
  • other UEs may attempt to decode every other segments as long as it can decode at least 1 segment, even when another first stage on another sub-channel is not decodable.
  • FIG. 12 is a flowchart 1200 of a method of wireless communication.
  • the method may be performed by a UE (e.g., the UE 104, any UE in FIG. 7, any UE in FIG. 9; or the apparatus 1302) .
  • the method may improve the use of inter-UE coordination information and/or sensing information for sidelink resource selection by enabling a transmitting UE to efficiently indicate to other sidelink UE whether to use inter-UE coordination information by using second stage SCI with low-delay.
  • the UE may receive sidelink reservation information from one or more UEs.
  • the sidelink reservation information may be carried by inter-UE coordination information.
  • the sidelink reservation information may include self-reservation, scheduling information, non-preferred resources, or preferred resources described in connection with 706 in FIG. 7 and 924 in FIG. 9.
  • the reception of the inter-UE coordination information may be performed by the inter-UE coordination information component 1340 of the apparatus 1302, e.g., via the transmission component 1334 and/or the transceiver 1322.
  • the UE may transmit second stage SCI, the second stage SCI comprising inter-UE coordination information based on the received sidelink reservation information from the one or more UEs and additional resource reservation information for the first UE, a format of the second stage SCI being indicated in a first stage SCI.
  • the transmission of the second stage SCI may be performed by the inter-UE coordination information component 1340 of the apparatus 1302, e.g., via the transmission component 1334 and/or the transceiver 1322.
  • the second stage SCI includes two or more code blocks to carry the inter-UE coordination information.
  • the second stage SCI may include two or more code blocks to carry the inter-UE coordination information.
  • a format of the second stage SCI indicates a number of code blocks of the second stage SCI.
  • each code block of the two or more code blocks is configured to be associated with a respective set of CRC bits.
  • the two or more code blocks are configured to be collectively associated with another set of CRC bits.
  • the second stage SCI includes information bits divided into multiple segments, each segment transmitted on a separate sub-channel. For example, as described in connection with FIG. 11, the second stage SCI includes information bits divided into multiple segments; each segment transmitted on a separate sub-channel.
  • the multiple segments are of an equal size. In some aspects, the equal size is a fixed size, and each segment may be associated with zero or more padding bits.
  • each segment of the multiple segments is self-contained.
  • the multiple segments are FDM’ed in one slot.
  • the multiple segments are associated with multiple corresponding consecutive subchannels.
  • each subchannel is associated with a separate first stage SCI associated with the respective second stage SCI, the second stage SCI spanning the respective subchannel.
  • the multiple segments and the multiple corresponding consecutive subchannels are associated with a defined order.
  • FIG. 13 is a diagram 1300 illustrating an example of a hardware implementation for an apparatus 1302.
  • the apparatus 1302 may be a UE, or another device configured to transmit and/or receive sidelink communication.
  • the apparatus 1302 includes a baseband processor 1304 (also referred to as a modem) coupled to a RF transceiver 1322.
  • the baseband processor 1304 may be a cellular baseband processor and/or the RF transceiver 1322 may be a cellular RF transceiver.
  • the apparatus 1302 may further include one or more subscriber identity modules (SIM) cards 1320, an application processor 1306 coupled to a secure digital (SD) card 1308 and a screen 1310, a Bluetooth module 1312, a wireless local area network (WLAN) module 1314, a Global Positioning System (GPS) module 1316, and/or a power supply 1318.
  • SIM subscriber identity modules
  • SD secure digital
  • GPS Global Positioning System
  • the baseband processor 1304 communicates through the RF transceiver 1322 with the UE 104 and/or BS 102/180.
  • the baseband processor 1304 may include a computer-readable medium /memory.
  • the computer-readable medium /memory may be non-transitory.
  • the baseband processor 1304 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory.
  • the software when executed by the baseband processor 1304, causes the baseband processor 1304 to perform the various functions described in the present application.
  • the computer-readable medium /memory may also be used for storing data that is manipulated by the baseband processor 1304 when executing software.
  • the baseband processor 1304 further includes a reception component 1330, a communication manager 1332, and a transmission component 1334.
  • the communication manager 1332 includes the one or more illustrated components.
  • the components within the communication manager 1332 may be stored in the computer-readable medium /memory and/or configured as hardware within the baseband processor 1304.
  • the baseband processor 1304 may be a component of the device 350 and may include the memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359.
  • the apparatus 1302 may be a modem chip and include just the baseband processor 1304, and in another configuration, the apparatus 1302 may be the entire UE (e.g., see 350 of FIG. 3) and include the additional
  • the communication manager 1332 includes an inter-UE coordination information component 1340 that is configured to receive sidelink reservation information from one or more UEs, e.g., as described in connection with 1202 in FIG. 12.
  • the inter-UE coordination information component 1340 may be further configured to transmit second stage SCI, the second stage SCI comprising inter-UE coordination information based on the received sidelink reservation information from the one or more UEs and additional resource reservation information for the first UE, a format of the second stage SCI being indicated in a first stage SCI, e.g., as described in connection with 1204 in FIG. 12.
  • the communication manager 1332 further includes a sensing component 1342 that is configured to perform sensing, e.g., as described in connection with FIG. 4, 5, or 6.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the flowchart of FIG. 12 and/or the aspects performed by the UE-Ain FIG. 7 or 9. As such, each block in the flowchart of FIG. 12 and/or the aspects performed by the UE-A in FIG. 7 or 9 may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • the apparatus 1302 includes means for receiving sidelink reservation information from one or more UEs.
  • the apparatus 1302 includes means for transmitting second stage SCI, the second stage SCI comprising inter-UE coordination information based on the received sidelink reservation information from the one or more UEs and additional resource reservation information for the first UE, a format of the second stage SCI being indicated in a first stage SCI.
  • the means may be one or more of the components of the apparatus 1302 configured to perform the functions recited by the means.
  • the apparatus 1302 may include the TX Processor 368, the RX Processor 356, and the controller/processor 359.
  • the means may be the TX Processor 368, the RX Processor 356, and the controller/processor 359 configured to perform the functions recited by the means
  • Combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • combinations such as “at least one of A, B, or C, ” “one or more of A, B, or C, ” “at least one of A, B, and C, ” “one or more of A, B, and C, ” and “A, B, C, or any combination thereof” may be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combinations may contain one or more member or members of A, B, or C.
  • Aspect 1 is an apparatus for wireless communication at a first UE, comprising: a memory; and at least one processor coupled to the memory and configured to: receive sidelink reservation information from one or more UEs; and transmit second stage SCI, the second stage SCI comprising inter-UE coordination information based on the received sidelink reservation information from the one or more UEs and additional resource reservation information for the first UE, a format of the second stage SCI being indicated in a first stage SCI.
  • Aspect 2 is the apparatus of aspect 1, wherein the second stage SCI comprises two or more code blocks to carry the inter-UE coordination information.
  • Aspect 3 is the apparatus of any of aspects 1-2, wherein a format of the second stage SCI indicates a number of code blocks of the second stage SCI.
  • Aspect 4 is the apparatus of any of aspects 1-3, wherein each code block of the two or more code blocks is configured to be associated with a respective set of CRC bits.
  • Aspect 5 is the apparatus of any of aspects 1-4, wherein the two or more code blocks are configured to be collectively associated with a set of CRC bits.
  • Aspect 6 is the apparatus of any of aspects 1-5, wherein the second stage SCI comprises information bits divided into multiple segments, each segment transmitted on a separate sub-channel.
  • Aspect 7 is the apparatus of any of aspects 1-6, wherein the multiple segments are of an equal size.
  • Aspect 8 is the apparatus of any of aspects 1-7, wherein the equal size is a fixed size, and wherein each segment is associated with zero or more padding bits.
  • Aspect 9 is the apparatus of any of aspects 1-8, wherein each segment of the multiple segments is self-contained.
  • Aspect 10 is the apparatus of any of aspects 1-9, wherein each segment of the multiple segments is associated with a segment ID.
  • Aspect 11 is the apparatus of any of aspects 1-10, wherein the multiple segments are FDM’ed in one slot.
  • Aspect 12 is the apparatus of any of aspects 1-11, wherein the multiple segments are associated with multiple corresponding consecutive subchannels.
  • Aspect 13 is the apparatus of any of aspects 1-12, wherein each subchannel is associated with a separate first stage SCI associated with the respective second stage SCI, the second stage SCI spanning the respective subchannel.
  • Aspect 14 is the apparatus of any of aspects 1-13, wherein the multiple segments and the multiple corresponding consecutive subchannels are associated with a defined order.
  • Aspect 15 is the apparatus of any of aspects 1-14, further comprising a transceiver coupled to the at least one processor.
  • Aspect 16 is a method of wireless communication for implementing any of aspects 1 to 15.
  • Aspect 17 is an apparatus for wireless communication including means for implementing any of aspects 1 to 15.
  • Aspect 18 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 15.

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

Abstract

Un premier équipement utilisateur (UE) peut recevoir des informations de réservation de liaison latérale en provenance d'un ou de plusieurs UE. Le premier UE peut transmettre des informations de commande de liaison latérale (SCI) de second étage, les SCI de second étage comprenant des informations de coordination inter-UE sur la base des informations de réservation de liaison latérale reçues en provenance du ou des UE et des informations de réservation de ressource supplémentaires pour le premier UE, un format de SCI de second étage étant indiqué dans des SCI de premier étage.
PCT/CN2021/109614 2021-07-30 2021-07-30 Signalisation de coordination inter-ue Ceased WO2023004755A1 (fr)

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Application Number Priority Date Filing Date Title
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Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CEWIT: "Feasibility and benefits for NR Sidelink mode 2 enhancements", vol. RAN WG1, no. e-meeting; 20210125 - 20210205, 18 January 2021 (2021-01-18), XP051971802, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_104-e/Docs/R1-2101647.zip R1-2101647.docx> [retrieved on 20210118] *
FRAUNHOFER HHI ET AL: "Resource Allocation Enhancements for Mode 2", vol. RAN WG1, no. e-Meeting; 20210510 - 20210527, 11 May 2021 (2021-05-11), XP052006223, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_105-e/Docs/R1-2104561.zip R1-2104561_SL_RA_M2enh.docx> [retrieved on 20210511] *
VIVO: "Discussion on mode 2 enhancements", vol. RAN WG1, no. e-Meeting; 20210510 - 20210527, 27 May 2021 (2021-05-27), XP052015751, Retrieved from the Internet <URL:https://ftp.3gpp.org/tsg_ran/WG1_RL1/TSGR1_105-e/Docs/R1-2106200.zip R1-2106200 Discussion on mode-2 enhancements.docx> [retrieved on 20210527] *

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