WO2024031482A1 - Amélioration de transmission de rétroaction de liaison latérale - Google Patents

Amélioration de transmission de rétroaction de liaison latérale Download PDF

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Publication number
WO2024031482A1
WO2024031482A1 PCT/CN2022/111579 CN2022111579W WO2024031482A1 WO 2024031482 A1 WO2024031482 A1 WO 2024031482A1 CN 2022111579 W CN2022111579 W CN 2022111579W WO 2024031482 A1 WO2024031482 A1 WO 2024031482A1
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WO
WIPO (PCT)
Prior art keywords
channel access
feedback
value
access parameter
sidelink
Prior art date
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PCT/CN2022/111579
Other languages
English (en)
Inventor
Renato Barbosa ABREU
Vinh Van Phan
Nuno Manuel KIILERICH PRATAS
Yong Liu
Timo Erkki Lunttila
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2022/111579 priority Critical patent/WO2024031482A1/fr
Publication of WO2024031482A1 publication Critical patent/WO2024031482A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • 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

  • Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for sidelink (SL) feedback transmission enhancement.
  • SL sidelink
  • the terminal devices may use the resources in a shared frequency band such as unlicensed spectrum to perform SL transmissions.
  • the terminal devices may be required to access resources in unlicensed spectrum by performing a channel access procedure to use the resources for SL operations.
  • a terminal device that received a SL transmission via resources in unlicensed spectrum may transmit feedback to a terminal device that performed the SL transmission.
  • Works are ongoing to introduce enhancements to SL feedback transmissions.
  • a first device comprising at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first device at least to perform: obtaining sidelink control information of sidelink transmissions with feedback associated with a same feedback occasion of the first device; obtaining respective values of at least one channel access parameter associated with the feedback of the sidelink transmissions based on the sidelink control information; and determining a value of the at least one channel access parameter for transmitting the feedback of the sidelink transmissions on the same feedback occasion of the first device as a function of the respective values of the at least one channel access parameter.
  • a second device comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second device at least to perform: transmitting channel access configuration information to a first device, the channel access configuration information comprising at least one of the following: a function for determining a value of at least one channel access parameter from a plurality of values of the at least one channel access parameter, the value of the at least one channel access parameter being used for transmitting feedback of sidelink transmissions of the first device, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated to the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining the value of the at least one channel access parameter is to be updated based on the function.
  • a method comprises: obtaining, at a first device, sidelink control information of sidelink transmissions with feedback associated with a same feedback occasion of the first device; obtaining respective values of at least one channel access parameter associated with the feedback of the sidelink transmissions based on the sidelink control information; and determining a value of the at least one channel access parameter for transmitting the feedback of the sidelink transmissions on the same feedback occasion of the first device as a function of the respective values of the at least one channel access parameter.
  • a method comprises: transmitting, at a second device and to a first device, channel access configuration information, the channel access configuration information comprising at least one of the following: a function for determining a value of at least one channel access parameter from a plurality of values of the at least one channel access parameter, the value of the at least one channel access parameter being used for transmitting feedback of sidelink transmissions of the first device, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated to the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining the value of the at least one channel access parameter is to be updated based on the function.
  • a first apparatus comprises: means for obtaining sidelink control information of sidelink transmissions with feedback associated with a same feedback occasion of the first apparatus; obtaining respective values of at least one channel access parameter associated with the feedback of the sidelink transmissions based on the sidelink control information; and determining a value of the at least one channel access parameter for transmitting the feedback of the sidelink transmissions on the same feedback occasion of the first apparatus as a function of the respective values of the at least one channel access parameter.
  • a second apparatus comprises: means for transmitting channel access configuration information to a first apparatus, the channel access configuration information comprising at least one of the following: a function for determining a value of at least one channel access parameter from a plurality of values of the at least one channel access parameter, the value of the at least one channel access parameter being used for transmitting feedback of sidelink transmissions of the first apparatus, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated to the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining the value of the at least one channel access parameter is to be updated based on the function.
  • a computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the third aspect.
  • a computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the fourth aspect.
  • FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented
  • FIG. 2 illustrates a signaling chart for communication according to some example embodiments of the present disclosure
  • FIG. 3A, FIG. 3B and FIG. 3C illustrate some examples of SL transmission with a channel access procedure
  • FIG. 4 illustrates an example SL slot according to some example embodiments of the present disclosure
  • FIG. 5A and FIG. 5B illustrate example mappings between SL transmission and SL feedback according to some example embodiments of the present disclosure
  • FIG. 6 illustrates a flowchart of a process for determining a channel access procedure for feedback transmission according to some example embodiments of the present disclosure
  • FIG. 7 illustrates a flowchart of a method implemented at a first device according to some example embodiments of the present disclosure
  • FIG. 8 illustrates a flowchart of a method implemented at a second device according to some example embodiments of the present disclosure
  • FIG. 9 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure.
  • FIG. 10 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first, ” “second” and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system
  • the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , an NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology
  • radio access network (RAN) split architecture comprises a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node.
  • An IAB node comprises a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.
  • IAB-MT Mobile Terminal
  • terminal device refers to any end device that may be capable of wireless communication.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • the terminal device may comprise a device which performs device-to-device (D2D) communication (also referred to as a D2D device) .
  • the terminal device may also comprise a device in a vehicle-to-everything (V2X) communication (also referred to as a V2X device) .
  • the V2X communication may include but not limited to vehicle-to-infrastructure (V2I) communication, vehicle-to-network (V2N) communication, vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, or vehicle-to-device (V2D) communication.
  • the terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node) .
  • MT Mobile Termination
  • IAB node e.g., a relay node
  • the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
  • resource may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like.
  • a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
  • FIG. 1 illustrates an example communication environment 100 in which example embodiments of the present disclosure can be implemented.
  • a device 110 has a certain coverage range, which may be called as a serving area or a cell 102.
  • One or more devices may be located within or outside the cell 102.
  • device 120 and device 130 are located within the cell 102 and thus can communicate with the device 110.
  • a device 140 is located outside the cell 102 and thus is not able to obtain service from the device 110.
  • the device 120 and device 130 may include terminal devices, and the device 110 may include a network device serving the terminal devices.
  • the device 140 may also include a terminal device.
  • a link from the device 120 (or device 130) to the device 110 is referred to as an uplink (UL)
  • a link from the device 110 to the device 120 (or device 130) is referred to as a downlink (DL) .
  • different terminal devices may establish communication connections with each other.
  • the device 120 and device 130 within the cell 102 may establish communication connections with each other.
  • the device 140 outside the cell 102 may also establish communication connections with the device 120 and/or the device 130 within the cell 102.
  • a terminal device such as the device 120, 130 or 140 may establish communication connections with a plurality of other terminal devices.
  • the communications between the terminal devices may be referred to as sidelink (SL) communications.
  • a terminal device may communicate data and control information with more than one terminal device if the SL connections are established therebetween.
  • a terminal device such as the device 120 (or the device 130 or device 140) performing a transmission is referred to as a transmitting (TX) device (or a transmitter) and a terminal device such as the device 130 (or the device 120 or device 140) receiving the transmission is referred to as a receiving (RX) device (or a receiver) .
  • TX transmitting
  • RX receiving
  • SL communications may support one or more communication methods including unicast communication, multicast communication, and broadcast communication.
  • SL may include one or more logical channels, including but not limited to a Physical Sidelink Control Channel (PSCCH) , a Physical Sidelink Shared Channel (PSSCH) , a Physical Sidelink Feedback Channel (PSFCH) , a Physical Sidelink Discovery Channel (PSDCH) , and a Physical Sidelink Broadcast Channel (PSBCH) .
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSFCH Physical Sidelink Feedback Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the communication environment 100 may include any suitable number of devices to implement example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be located in the cell 102, and one or more additional cells may be deployed in the communication environment 100.
  • some example embodiments are described with the device 110 operating as a network device and the devices 120, 130 and 140 operating as terminal devices.
  • operations described in connection with a terminal device may be implemented at a network device or other device, and operations described in connection with a network device may be implemented at a terminal device or other device.
  • Communications in the communication environment 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • s cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) , the sixth generation (6G) , and the like
  • wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and/or any other technologies currently known or to be developed in the future.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • MIMO Multiple-Input Multiple-Output
  • OFDM Orthogonal Frequency Division Multiple
  • DFT-s-OFDM Discrete Fourier Transform spread OFDM
  • the terminal devices may use the resources in unlicensed spectrum such as a shared radio frequency band to perform SL transmissions.
  • the terminal devices may be required to access resources in unlicensed spectrum by performing a channel access procedure to use the resources for SL operations.
  • a terminal device that received a SL transmission via resources in unlicensed spectrum may transmit feedback to a terminal device that performed the SL transmission.
  • the TX terminal device may enable Hybrid Automatic Repeat request (HARQ) feedback over the SL from a terminal device that is the intended recipient of a PSSCH transmission (that is, the RX terminal device) to a terminal device that performed the PSSCH transmission (that is, the TX terminal device) .
  • HARQ Hybrid Automatic Repeat request
  • the RX terminal device when transmitting the SL feedback such as the HARQ feedback, the RX terminal device need to access to a resource in the unlicensed spectrum as well.
  • the resource for SL feedback such as the PSFCH may be derived from the resource location of the SL transmission such as the PSCCH or PSSCH.
  • the RX terminal device may use a channel occupancy time (COT) initiated by a TX terminal device to transmit the SL feedback.
  • COT channel occupancy time
  • a priority value or a priority level may be assigned to a PSFCH transmission or reception. Th priority value or priority level may reflect latency requirement and may be associated as described in 3 rd generation partnership project (3GPP) technical specification (TS) .
  • 3GPP 3 rd generation partnership project
  • TS technical specification
  • a priority value for the PSFCH may be equal to the priority value indicated by and sidelink control information (SCI) format 1-A associated with the PSFCH.
  • SCI sidelink control information
  • a priority value for the PSFCH may be equal to the smallest priority value determined by the corresponding SCI format 1-A for the conflicting resources.
  • a priority value for the PSFCH may be equal to the priority value determined by the corresponding SCI format 1-A for the conflicting resources.
  • the TX initiated COT is unavailable for RX transmission, thus the RX terminal device need to initiate a COT for SL feedback transmission.
  • a channel access priority needs to be associated with the SL feedback transmission.
  • Such channel access priority may be used in a channel access procedure such as a Listen Before Talk (LBT) Type 1 procedure to initiate a COT.
  • LBT Listen Before Talk
  • the channel access priority such as Channel Access Priority Class (CAPC) of the PSFCH transmission may depend on the priority value of corresponding SL transmissions such as PSCCH or PSSCH transmissions indicated by an SCI format 1-A.
  • the channel access priority of the PSFCH transmission may be associated with the data priority.
  • a terminal device A transmits PSCCH/PSSCH A with a priority value p A to the RX terminal device
  • a terminal device B transmits PSCCH/PSSCH B with a priority value p B (different from p A ) to the RX terminal device.
  • Both the PSCCH/PSSCH A and the PSCCH/PSSCH B are associated to a same PSFCH occasion.
  • the RX terminal device may transmit feedback associated to PSCCH/PSSCH A or PSCCH/PSSCH B on this PSFCH occasion.
  • the RX terminal device is associated to a CAPC of high p value (for low priority information) it has higher probability of failing LBT and may miss the PSFCH transmission, causing HARQ-ACK misdetection issues such as unnecessary retransmissions or Not Acknowledge (NACK) -to-ACK misinterpretation in case NACK-only HARQ option is used.
  • NACK Not Acknowledge
  • the RX terminal device is associated to a CAPC of low p value (for high priority information) it has higher chance to acquire the channel as the contention window is lower, but it may happen in detriment of LBT failure for other devices which are also competing for the channel.
  • an RX terminal device sending feedback associated to PSCCH/PSSCH B uses a low CAPC/smaller Contention Window (CW) and another RX terminal device sending feedback associated to PSCCH/PSSCH A uses a high CAPC/larger CW
  • the former RX terminal device may be able to finish the LBT procedure to transmit PSFCH.
  • NR New Radio
  • NR-U new Radio
  • NR-U new Radio
  • a lowest priority of logical channels (LCHs) multiplexed in a transmission block (TB) is selected.
  • SRB Signaling Radio Bearer
  • CG configured grant
  • the CAPC of the SRB may be used.
  • PUCCH Physical Uplink Control Channel
  • PUCCH Physical Uplink Control Channel
  • NR-U design may be applied in the SL feedback transmission.
  • the NR-U design does not take into account the SL groupcast scenarios where multiple RX terminal devices have to send feedback to the TX terminal device. If the NR-U design is adopted, one low priority transmission from TX terminal device would trigger many RX terminal devices competing for the channel against other devices. It is unfair for other devices using the unlicensed spectrum.
  • a proper channel access parameter value such as a proper channel access priority for the SL feedback transmission.
  • a first device obtains SCI of SL transmissions associated with a same feedback occasion such as a same PSFCH occasion.
  • the first device determines respective values of at least one channel access parameter associated with the feedback of SL transmissions based on the obtained SCI.
  • the at least one channel access parameter may include the channel access priority of the SL feedback.
  • the first device selects a value for the at least one channel access parameter by using a function of the respective values of the at least one channel access parameter of the received SL transmissions.
  • FIG. 2 shows a signaling chart 200 for communication according to some example embodiments of the present disclosure.
  • the signaling chart 200 involves a first device 201 and a second device 202.
  • the first device 201 may include a terminal device, such as one of the devices 120, device 130 or device 140 in FIG. 1.
  • the second device 202 may include a network device such as the device 110 in FIG. 1.
  • the second device 202 may include a terminal device different with the first device 201, such as another one of the devices 120, device 130 or device 140 in FIG. 1.
  • first device 201 and one second device 202 are illustrated in FIG. 2, it would be appreciated that there may be a plurality of first device performing similar operations as described with respect to the first device 201 below and a plurality of second device performing similar operations as described with respect to the second device 202 below.
  • the second device 202 may transmit (210) configuration information to the first device 201.
  • the second device 202 may transmit (210) channel access configuration information to the first device 201.
  • the second device 202 may transmit (210) the channel access configuration information together with resource pool configuration. For example, in mode 1 SL transmission, the second device 202 may transmit the resource pool configuration together with the channel access configuration information to the first device 201.
  • the second device 202 may transmit (210) the channel access configuration information via SL Synchronization Signal/Physical Broadcast Channel (PBCH) Block (SSB) , via SCI, via PC5 Radio Resource Control (RRC) , or any other suitable method.
  • PBCH Physical Broadcast Channel
  • RRC Radio Resource Control
  • the first device 201 may receive (215) the configuration information such as the channel access configuration information. Details regarding the channel access configuration information will be described below.
  • the first device 201 may receive (220) SL transmission (s) .
  • the first device 201 may receive (220) SL transmissions from other terminal devices.
  • the second device 202 include a terminal device
  • the first device 201 may receive (220) the SL transmission (s) from the second device 202.
  • the SL transmissions may be performed on a shared frequency band such as an unlicensed band (also referred to as unlicensed spectrum) .
  • the other terminal devices need to perform a channel access procedure to initiate a channel occupancy time (COT) before sending the SL transmissions to the first device 201.
  • the channel access procedure may include LBT. Examples of channel access procedures will be described below.
  • different channel access procedures comprising LBT may be used before performing a SL transmission by the terminal devices.
  • LBT clear channel assessment
  • a device needs to observe the shared frequency band as available for a number of consecutive clear channel assessment (CCA) slots.
  • CCA clear channel assessment
  • the duration of a slot may be 9 ⁇ s.
  • a measured power i.e., a collected energy during the CCA slot
  • the device may determine that the shared frequency band as available in this CCA slot.
  • an initiating device 310 when an initiating device 310 intends to perform a transmission to a responding device 320 using resources on a shared radio frequency band, the initiating device 310 needs to acquire the permission to access the shared radio frequency band for a certain period of time, which is also referred to as the Channel Occupancy Time (COT) 340 by applying a channel access procedure.
  • the term “initiating device” may refer to a device that initiates a transmission (s) to one or more other devices and obtains a COT for the transmission (s) .
  • the term “responding device” may refer to a device to which the initiating device performs the transmission.
  • the channel access procedure may be an “extended” LBT procedure (for example, a LBT Type 1 (also referred to as Type 1 LBT) procedure or a type 1 channel access procedure) where the shared radio frequency band is sensed to be idle for the duration of a sensing interval determined based on a Contention Window.
  • LBT Type 1 also referred to as Type 1 LBT
  • Type 1 channel access procedure the shared radio frequency band is sensed to be idle for the duration of a sensing interval determined based on a Contention Window.
  • the initiating device 310 may perform a further channel access procedure within the COT 340.
  • the channel access procedure may include a “reduced” LBT procedure (for example, a LBT Type 2 (also referred to as Type 2 LBT) procedure or a type 2 channel access procedure) , through which the initiating device 310 may need to monitor the shared radio frequency band for a smaller period of time as compared with the “extended” LBT procedure (for example, the LBT Type 1 procedure) .
  • FIG. 3B shows an example of performing a LBT Type 2 procedure before a new transmission performed by the initiating device 310 within the COT 340.
  • the initiating device 310 performs an initial transmission 350. After that, the initiating device 310 may intend to perform a new transmission 352 within the COT 340. As shown in FIG. 3B, the initiating device 310 may need to perform a LBT Type 2 procedure before performing the transmission 352 in order to check that the shared radio frequency band is available for communication.
  • the LBT Type 2 procedure may include a LBT Type 2A procedure, a LBT Type 2B procedure and a LBT Type 2C procedure.
  • the channel access procedure to be performed is determined based on a duration of a time gap 360 between the transmissions 350 and 352. For example, if the duration of the time gap 360 is greater than or equal to 25 ⁇ s, then the initiating device 310 may perform a LBT Type 2A (referred to as “25 ⁇ s LBT” ) procedure.
  • the initiating device 310 may perform a LBT Type 2B (referred to as “16 ⁇ s LBT” ) procedure. If the duration of the time gap 360 is less than 16 ⁇ s, then the initiating device 310 may perform a LBT Type 2C procedure which may require no LTB procedure to be performed. That is, if a LBT Type 2C procedure is selected, then the initiating device 310 may directly perform the transmission 352 without actually performing a channel access procedure.
  • LBT Type 2B referred to as “16 ⁇ s LBT”
  • the initiating device 310 which has acquired the COT 340 may share the COT 340 with one or more other devices with which it communicates, for example, the responding device 320.
  • the initiating device 310 may inform (e.g., via control signaling) the responding device 320 about the duration of the COT 340.
  • the responding device 320 may be able to perform a transmission within the COT 340 through a “reduced” LBT procedure. It is noted that the responding device 320 becomes an initiating device when it performs a transmission.
  • FIG. 3C shows an example of performing a LBT Type 2 procedure before a transmission by the responding device 320 within the COT 340.
  • the initiating device 310 performs the transmission 350.
  • the responding device 320 may intend to perform a transmission 370 within the COT 340.
  • the responding device 320 may perform a LBT Type 2 procedure before the transmission 370 in order to check that the shared radio frequency band is available for communication.
  • the LBT Type 2 procedure performed by the responding device 320 may be selected based a duration of a time gap 380 between the transmissions 350 and 370. For example, if the duration of the time gap 380 is greater than or equal to 25 ⁇ s, then the responding device 320 may perform a LBT Type 2A procedure. If the duration of the time gap 380 is equal to 16 ⁇ s, then the responding device 320 may perform a LBT Type 2B procedure. If the duration of the time gap 380 is less than 16 ⁇ s, then the responding device 320 may perform a LBT Type 2C procedure and thus can directly perform the transmission 370. In some cases, if the responding device 320 initiates its transmission outside of the COT 340, then it may need to acquire a new COT using the “extended” LBT procedure.
  • the initiating device may transmit SL transmissions to the first device 201.
  • the first device 201 may receive (220) the SL transmissions from the initiating device. It is to be understood that the first device 201 may receive (220) SL transmissions from any suitable number of initiating devices. Alternatively, or in addition, the first device 201 may also receive (220) SL transmissions in a COT initiated by the first device 201 itself and shared with another device. In some example embodiments, the first device 201 may receive (220) SL transmissions from different devices in proximity of the first device 201 for different RX devices or RX devices groups.
  • the first device 201 obtains (225) SCI of SL transmissions with feedback associated with a same feedback occasion of the first device 201.
  • the first device 201 may monitor SCI of the SL transmissions.
  • the feedback of SL transmissions may include PSFCH transmissions.
  • the feedback occasion may include a feedback slot, such as a PSFCH slot.
  • the SCI may follow a 2-stage SCI structure.
  • the 1 st -stage SCI also referred to as SCI format 1-A
  • the SCI format 1-A may include information needed to determine resource allocation of the PSSCH and to decode 2 nd -stage SCI.
  • the 2 nd -stage SCI (such as SCI format 2-A or SCI format 2-B) may be carried by PSSCH (multiplexed with sidelink shared channel (SL-SCH) ) .
  • the 2 nd -stage SCI may include control information of HARQ feedback in unicast or groupcast. It is to be understood that the 1 st -stage SCI and 2 nd -stage SCI may further include other suitable information. Examples of additional information included in the SCI will be described below.
  • the SCI format 1-A may be used for the scheduling of PSSCH and 2nd-stage-SCI on PSSCH.
  • the following information is transmitted by means of the SCI format 1-A:
  • N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList, if higher layer parameter sl-MultiReserveResource is configured; 0 bit otherwise;
  • N pattern is the number of DMRS patterns configured by higher layer parameter sl-PSSCH-DMRS-TimePatternList; 0 bit if sl- PSSCH-DMRS-TimePatternList is not configured;
  • Additional MCS table indicator – 1 bit if one MCS table is configured by higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by higher layer parameter sl-Additional-MCS-Table; 0 bit otherwise;
  • SCI Format 2-A has the following information: HARQ process number, New data indicator, Redundancy version, Source ID, Destination ID, HARQ feedback enabled/disabled indicator, Cast type indicator and CSI request.
  • SCI Format 2-B may have the following information: HARQ process number, New data indicator, Redundancy version, Source ID, Destination ID, HARQ feedback enabled/disabled indicator, Zone ID and Communication range requirement.
  • the 2 nd -stage SCI may include control information of HARQ feedback in unicast or groupcast.
  • the following HARQ feedback options may be configured for groupcast.
  • a first option is NACK-only HARQ feedback. In this first option, all terminal devices in the group share a single PSFCH resource.
  • the TX device determines ACK if and only if no NACK is received in that shared PSFCH resource.
  • the RX device ’s decision whether to send feedback may be based on a distance between the TX and RX devices. This option may be used for any group size, and may be used when the group is formed without any higher layer group management.
  • a second option is ACK/NACK HARQ feedback.
  • each RX device uses a dedicated PSFCH resource.
  • the TX device determines ACK only if all expected ACKs and no NACKs are received.
  • the first device 201 obtains (230) respective values of at least one channel access parameter associated with the feedback of the SL transmissions based on the obtained SCI.
  • the at least one channel access parameter may include at least one of: a channel access priority class (CAPC) , or a size of a contention window (CW) .
  • the at least one channel access parameter may include a channel access procedure type such as a LBT type.
  • the first device 201 may obtain (230) the respective values of the at least one channel access parameter based on an explicit CAPC indication comprised in the 1 st or 2 nd stage SCI. Alternatively, or in addition, in some example embodiments, the first device 201 may obtain (230) the respective values of the at least one channel access parameter based on respective data priorities of the SL transmissions and an association rule between a CAPC and a data priority. The association rule may be indicated in the SCI. With the values of CAPC determined, values of size of CW may also be determined based on an association rule between the CAPC and the size of CW.
  • the first device 201 may also determine values of size of CW based on the obtained SCI, and determine values of CAPC based on the values of size of CW. It is to be understood that the above-described methods for obtaining values of the at least one channel access parameter are only for the purpose of illustration, any suitable methods for obtaining values of the at least one channel access parameter may be applied. In some example embodiments, the obtained values of the at least one channel access parameter may be stored by the first device 201.
  • the first device 201 may determine (235) whether to transmit feedback of the received SL transmissions on the same feedback occasion of the first device 201 based on the obtained SCI.
  • the SCI may include information regarding whether to transmit feedback of the SL transmissions.
  • the SCI may also include resource pool configuration information.
  • the resource pool configuration information may include information for the first device 201 to decode a SL transmission.
  • the resource pool configuration information may include information such as the number of sub-channels, the number of physical resource blocks (PRBs) per sub-channels, the number of symbols in the PSCCH, which slots have a PSFCH and any other suitable configurations.
  • FIG. 4 illustrates an example SL slot 401 with PSCCH/PSSCH and PSFCH.
  • This SL slot may be configured by the resource pool configuration information in the SCI.
  • a PSFCH occasion 405 (such as a last symbol) may be included in the slot 401.
  • the PSFCH may enable HARQ feedback over the SL from a device that is the intended recipient of a PSSCH transmission (i.e., the RX device) to the device that performed the transmission (i.e., the TX device) .
  • a Zadoff-Chu sequence in one PRB is repeated over two Orthogonal Frequency Division Multiplexing (OFDM) symbols.
  • the Zadoff-Chu sequence as base sequence is (pre-) configured per SL resource pool.
  • the HARQ feedback resource (such as the PSFCH) may be derived from the resource location of PSCCH/PSSCH.
  • PSSCH-to-HARQ timing there is a configuration parameter K with the unit of slot.
  • the time occasion for PSFCH may be determined from K.
  • HARQ feedback may be in slot n+a where a is the smallest integer larger than or equal to K with the condition that slot n+a contains PSFCH resources.
  • K may be equal to 2 or 3 or any other suitable value, and a single value of K can be (pre-) configured per resource pool.
  • FIG. 5A illustrates an example mapping between SL transmission and SL feedback according to some example embodiments of the present disclosure.
  • This mapping may be configured by SCI.
  • K may be equal to 2.
  • PSSCH 510 PSSCH 2
  • Mset PRBs M PRBs
  • PSSCH 520 PSSCH 12
  • Mset PRBs 525 Mset PRBs 525.
  • the PSFCH may be configured with a priority value.
  • a set of Mset PRBs associated with a sub-channel are shared among multiple RX devices in case of ACK/NACK feedback for groupcast communications or in the case of different PSSCH transmissions in the same sub-channel.
  • For each PRB available for PSFCH there are Q cyclic shift pairs available to support the ACK or NACK feedback of Q RX UEs within the PRB.
  • the first device 201 may determine which PRB and cyclic shift pair should be used for sending its HARQ feedback based on the PSFCH index i.
  • the first device 201 may use the first or second cyclic shift from the cyclic shift pair associated with the selected PSFCH index i in order to send NACK or ACK, respectively.
  • a TX device can distinguish the HARQ feedback of different RX device (s) .
  • prioritization of simultaneous PSFCH transmission/reception may be applied.
  • the first device 201 may determine a channel access priority for the SL feedback.
  • the first device 201 may determine (235) to transmit the feedback of the SL transmissions based on configuration information included in the SCI. It is to be understood that the first device 201 may use any suitable method to determine (235) whether to transmit the SL feedback.
  • the first device 201 may determine (240) whether the first device 201 needs to initiate a COT for the SL feedback transmission. For example, if there already exists an available COT for the first device 201, the first device 201 may use the COT to transmit the SL feedback. In some example embodiments, the COT is available means that there should be an initiated COT which finishes after the transmitting symbol of the PSFCH. In some example embodiments, the first device 201 may use a channel access procedure such as a LBT Type 2 procedure for transmitting the PSFCH. For example, the first device 201 may determine which type of channel access procedure to perform based on configuration in SCI.
  • the first device 201 may need to initiate a COT.
  • the first device 201 may perform a channel access procedure such as a type 1 channel access procedure (for example, LBT Type 1) to initiate a COT.
  • a type 1 channel access procedure for example, LBT Type 1
  • the first device 201 may perform a channel access procedure to initiate a COT.
  • the first device 201 needs to determine a value of the at least one channel access parameter for transmitting the feedback of the SL transmissions on the same feedback occasion of the first device 201. For example, the first device 201 may determine a channel access priority for the SL feedback. As used herein, the value of the at least one channel access parameter determined by the first device 201 for transmitting the feedback of the SL transmission may also be referred to as a “target value” . The first device 201 may apply the target value or the determined value of the at least one channel access parameter to transmit the feedback of the SL transmission.
  • the first device 201 determines (245) the value (also referred to as the target value) of the at least one channel access parameter for transmitting the feedback of the SL transmissions on the same feedback occasion of the first device 201 as a function of the respective values of the at least one channel access parameter.
  • the function for determining the target value of the at least one channel access parameter may be pre-configured or pre-defined.
  • the function may be configured by the second device 202.
  • the second device 202 may transmit (210) the channel access configuration information to the first device 201.
  • the first device 201 may receive (215) the channel access configuration information from the second device 202.
  • the channel access configuration information may include the function for determining the target value of the at least one channel access parameter.
  • the function may indicate that a minimum value or a maximum value among a plurality of values of the at least one channel access parameter is to be selected to be the target value of the at least one parameter.
  • the function may indicate a calculation for determining the target value based on the plurality of values.
  • the function may indicate to obtain an average value, or weighted average value.
  • the function may indicate to rank the plurality of values in an ascending order or descending order and select a value with a target ranking order as the target value.
  • the function may also indicate a threshold value. A value above the threshold value or alternatively below the threshold value may be determined as the target value. It is to be understood that the above examples of the function for determining the target value are only for the purpose of illustration, any suitable function can be applied to determine the target value.
  • the function may indicate the first device 201 to choose a minimum CAPC (corresponding to a highest priority) or a maximum CAPC (corresponding to a lowest priority) . It is to be understood that with the target value for the CAPC determined, a target value for the size of CW and any other channel access parameter may also be determined based on the target value for CAPC and the association rule between different channel access parameters.
  • the function may indicate the first device 201 to choose a smallest CW or a largest CW. It is to be understood that with the target value for the size of CW determined, a target value for CAPC and any other channel access parameter may also be determined based on the target value for size of CW and the association rule between different channel access parameters. In such cases, the size of CW of the SL transmission with a certain CAPC may be adjusted based on number of HARQ transmission failures. For example, the first device 201 may use Table 2 below to determine a value of one of the channel access parameters based on value of another channel access parameter.
  • contention window length in CCA slots associated with each CAPC has a minimum (CW min, p ) and maximum (CW max, p ) .
  • the duration of the COT is given by T ulm cot, p .
  • FIG. 5B illustrates an example mapping between SL transmission and SL feedback according to some example embodiments of the present disclosure.
  • use CAPC as an example of the at least one channel access parameter.
  • PSSCH 560 is mapped to Mset PRBs 565 in the PSFCH occasion 580.
  • PSSCH 570 is mapped to Mset PRBs 575 in the PSFCH occasion 580.
  • the CAPC of the PSSCH 570 is p A
  • the CAPC of the PSSCH 570 is p B .
  • the first device 201 may determine (245) the target value P of the CAPC by using the function indicating to select a minimum value.
  • the first device 201 may choose a minimum value from p A and p B .
  • the first device can take advantage that another SL-U device may be accessing the feedback channel with a higher priority, thus can improve the chance of the multiple PSFCH being transmitted together.
  • the at least one channel access parameter may include a parameter other than CAPC.
  • the first device 201 may be pre-configured with a set of functions for determining the target value.
  • the set of functions may include selecting the minimum value, selecting the maximum value, selecting the average value, etc.
  • the channel access configuration information may include a function index associated with a respective function in the set of functions. The first device 201 may choose the respective function from the set of functions based on the received channel access configuration information.
  • the channel access priority for feedback for different devices may be adjusted. In this way, one device may downgrade the channel access priority for feedback based on a function to select a lower priority in favor of other devices competing for the channel.
  • the channel access configuration information may include a mapping rule between a SL transmission priority and a value of the at least one channel access parameter for the feedback associated to the SL transmissions.
  • the priority indicated in SCI may be mapped to CAPC in the following manner: a priority with value 1 or 2 may be mapped to CAPC p being equal to 1, a priority with value 3 or 4 may be mapped to CAPC p being equal to 2, a priority with value 5 or 6 may be mapped to CAPC p being equal to 3, and a priority with value greater than 6 may be mapped to CAPC p being equal to 4.
  • the above-mentioned mapping rule and the example values and CAPC are only for the purpose of illustration, without suggesting any limitations. Any suitable mapping rule may be included in the channel access configuration information.
  • the channel access configuration information may include a threshold number for determining whether the target value of the at least one channel access parameter is to be updated based on the function.
  • the first device 201 may determine the target value based on the function. For example, in the example where the function indicates to select a minimum value of CAPC (i.e., a highest priority) , if the first device 201 determines that the number of feedback transmissions on the same feedback occasion exceeds the threshold number, the first device 201 may upgrade the target value to indicate a higher transmission priority of the feedback.
  • the first device 201 may downgrade the target value to indicate a lower transmission priority of the feedback.
  • the channel access priority for the SL feedback may be adjusted. In this way, it may be beneficial for reducing HARQ-ACK issues when much feedback needs to be sent in the shared channel or unlicensed channel.
  • the channel access configuration information may include a cast type rule for determining whether the target value of the at least one channel access parameter is to be updated based on the function.
  • the cast type rule may include a first rule that the first SL transmission includes a unicast transmission, and the second transmission includes at least one of: a unicast transmission requesting feedback, or a groupcast transmission requesting feedback.
  • the cast type rule may include a second rule that the first SL transmission includes a groupcast transmission and the second transmission includes a groupcast transmission requesting feedback.
  • the first device 201 may update the target value based on the function. For example, if the first SL transmission meets the cast type rule, the first device 201 may update the target value based on the function. For another example, if any SL transmission with feedback associated to same occasion as feedback of the first SL transmission meets the cast type rule, the first device 201 may update the target value based on the function.
  • channel access configuration information examples have been described. It is to be understood that the at least one of the above examples such as the function, the mapping rule, the threshold number or the cast type rule may be included in the channel access configuration information.
  • the channel access configuration information may also include any other suitable information related to the channel access parameter or channel access procedure.
  • the first device 201 may perform (250) a type 1 channel access procedure, such as a LBT Type 1 procedure. Details of LBT Type 1 procedure have been described with respect to FIG. 3A, which will not be repeated here.
  • the first device 201 may transmit (255) feedback associated with the received SL transmissions. For example, the first device 201 may transmit (255) PSFCH to devices transmitting the SL transmissions with feedback to the first device 201.
  • the first device 201 may compare a second value of the at least one channel access parameter of further feedback of the further SL transmission with the target value. If the first device 201 determines that a second value of the at least one channel access parameter of further feedback of the further SL transmission is associated to a second transmission priority higher than a first transmission priority of the first feedback transmission, the first device 201 may decrease a time duration for the type 1 channel access procedure.
  • the first device 201 may decrement the backoff counter of the LBT by D, where D is the difference between the CW size used for the ongoing LBT and the CW size which would be used for LBT with upgraded channel access parameter.
  • D is the difference between the CW size used for the ongoing LBT and the CW size which would be used for LBT with upgraded channel access parameter.
  • the time duration for the channel access procedure may be adjusted based on the channel access priority.
  • the function for determining the target value may applied for the channel access parameters taken from PSCCH or PSSCH in the same slot or up to the slot prior to starting LBT. In such cases, the channel access time duration adjustment may not be applied.
  • channel access priority determinations have been described above. With the determined target value of the channel access priority, it may improve the chance of LBT success when multiplexing multiple PSFCH in a same slot. Moreover, it may lead to better fairness towards other devices such as other Radio Access Technology (RAT) , as the channel access parameter may be not upgraded more than necessary.
  • RAT Radio Access Technology
  • FIG. 6 illustrates a flowchart of a process 600 for determining a channel access procedure for feedback transmission according to some example embodiments of the present disclosure.
  • the process 600 may be implemented at the first device 201 in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the process will be described from the perspective of the first device 201 in FIG. 2.
  • the first device 201 may start selection of at least one channel access parameter for next feedback.
  • the time interval between a current slot and next feedback slot is higher than a time gap threshold.
  • the time gap threshold may be a minimum time gap such as sl-MinTimeGapPSFCH or K slots.
  • the time gap threshold may be configured by the second device 202 in FIG. 2.
  • the time gap threshold may be configured by SCI.
  • the time gap threshold may be configured by a SL resource configuration from a network device.
  • the at least one channel access parameter may include CAPC, the size of CW, or other suitable channel access parameter.
  • the feedback may include PSFCH.
  • the feedback slot may include a PSFCH slot or PSFCH occasion.
  • the first device 201 may detect SL transmissions in the current SL slot. For example, the first device 201 may monitor PSCCH or PSSCH in the current SL slot.
  • the first device 201 may determine whether a SL transmission is detected in the SL slot. For example, the first device 201 may determine whether any PSCCH or PSSCH is detected in the SL slot. If the first device 201 does not detect any SL transmissions such as PSCCH or PSSCH at block 615, the first device 201 may proceed with a next SL slot at block 625. For example, the first device 201 may detect SL transmission in the next PSCCH or PSSCH slot at block 625.
  • the first device 201 may obtain values of at least one channel access parameter for feedback associated to the SL transmissions.
  • the first device 201 may obtain and store values of at least one channel access parameter for PSFCH associated to PSCCH or PSSCH transmissions.
  • the at least one channel access parameter may include CAPC, the CW size, or any other suitable parameter.
  • the first device 201 may proceed with next SL slot. For example, the first device 201 will go to the next SL slot to monitor PSCCH or PSSCH.
  • the first device 201 may determine whether the time interval between the current SL slot and next feedback slot is higher than the time gap threshold.
  • the time gap threshold may be a minimum time gap such as sl-MinTimeGapPSFCH or K slots.
  • the time gap threshold may be configured by the second device 202 in FIG. 2.
  • the time gap threshold may be configured by SCI.
  • the time gap threshold may be configured by a SL resource configuration from a network device.
  • the first device 201 may continue to detect SL transmissions in the current SL slot.
  • the time gap threshold it allows considering the first device 201’s processing delay in decoding the PSCCH and generating the HARQ feedback.
  • the first device 201 may determine whether there is feedback to be transmitted. For example, the first device 201 may determine whether there is PSFCH to be transmitted by the first device 201 in the next feedback slot or feedback occasion. This determination may be made based on the SCI.
  • the first device 201 may determine whether there is COT available for the feedback transmission. For example, the first device 201 may determine whether a COT previously initiated by the first device 201 itself or by other devices is still available for SL transmission by the first device 201.
  • the COT is available means that there should be an initiated COT which finishes after the transmitting symbol of the PSFCH.
  • the first device 201 may use a LBT Type 2 for transmitting the feedback.
  • the first device 201 may use a LBT Type 2 for transmitting PSFCH. Examples of Type 2 LBT processed have been described with respect to FIG. 3B and FIG. 3C, which will not be repeated here.
  • the first device 201 may select a value (also referred to as the target value) of the at least one channel access parameter for next feedback slot at block 605.
  • the first device 201 determines the target value of the at least one channel parameter. For example, the first device 201 determines the target value of the at least one channel parameter as a function of respective values of the at least one channel access parameter associated with feedback of the SL transmissions. The function used in determining the target value has been described with respect to FIG. 2, which will not be repeated here.
  • the first device 201 may perform a type 1 channel access procedure such as a LBT Type 1 by using the target value of the at least one channel access parameter. If the first device 201 passes the type 1 channel access procedure to initiate a COT, the first device 201 may transmit the SL feedback such as the PSFCH by using the initiated COT.
  • a type 1 channel access procedure such as a LBT Type 1 by using the target value of the at least one channel access parameter. If the first device 201 passes the type 1 channel access procedure to initiate a COT, the first device 201 may transmit the SL feedback such as the PSFCH by using the initiated COT.
  • the first device 201 may select the target value of the at least one channel access parameter for next feedback slot at block 605.
  • the time interval between the current slot and the next feedback slot is higher than the time gap threshold.
  • the first device 201 may perform the blocks 610-650 for the next PSFCH slot.
  • the first device 201 may select a target value of the at least one channel access parameter for next feedback slot at block 605.
  • the time interval between the current slot and the next feedback slot is higher than the time gap threshold.
  • the first device 201 may perform the blocks 610-650 for the next PSFCH slot.
  • the process 600 may be repeated in any SL slots.
  • the process 600 may be executed continuously or in a loop by the first device 201.
  • the first device 201 may continue monitoring the SL slots and trying to determine the value for the at least one channel access parameter of the corresponding feedback such as the PSFCH.
  • Examples processes for SL feedback transmissions according to the present disclosure have been described with respect to FIG. 6. It is to be understood that the process in FIG. 6 is only for the purpose of illustration, without suggesting any limitations.
  • the process 600 may include additional steps, or some of steps in the process 600 may be omitted.
  • By using the SL feedback transmission with the determined target value of channel access parameter it may improve the chance of LBT success when multiplexing multiple PSFCH in a same slot. Moreover, it may lead to better fairness towards other devices such as other Radio Access Technology (RAT) , as the channel access parameter may be not upgraded more than necessary.
  • RAT Radio Access Technology
  • FIG. 7 shows a flowchart of an example method 700 implemented at a first device in accordance with some example embodiments of the present disclosure.
  • the first device may include a terminal device.
  • the method 700 will be described from the perspective of the first device 201 in FIG. 2.
  • the first device 201 obtains sidelink control information of sidelink transmissions with feedback associated with a same feedback occasion of the first device 201.
  • the first device 201 obtains respective values of at least one channel access parameter associated with the feedback of the sidelink transmissions based on the sidelink control information.
  • the at least one channel access parameter includes at least one of the following: a channel access priority class, or a size of a contention window.
  • obtaining the respective values of the at least one channel access parameter associated with the feedback of the sidelink transmissions includes one of the following: obtaining the respective values of the at least one channel access parameter based on an explicit channel access priority class indication included in the sidelink control information; or obtaining the respective values of the at least one channel access parameter based on respective data priorities of the sidelink transmissions and an association rule between a channel access priority class and a data priority, the association rule being indicated in the sidelink control information.
  • the first device 201 determines a value of the at least one channel access parameter for transmitting the feedback of the sidelink transmissions on the same feedback occasion of the first device as a function of the respective values of the at least one channel access parameter. For example, the first device 201 may determine the value of the at least one channel access parameter as the function by at least one of the following: selecting a minimum value among the respective values as the value; or selecting a maximum value among the respective values as the value.
  • determining the value of the at least one channel access parameter comprises: determining that the number of a plurality of feedback transmissions on the same feedback occasion exceed a threshold number; and based on the determining that the number of feedback transmissions exceed the threshold number, determining the value based on the function.
  • determining the value of the at least one channel access parameter comprises: determining that at least one of a first sidelink transmission of the sidelink transmissions or a second sidelink transmission meets a cast type rule; and based on the determining that at least one of the first or second sidelink transmission meets the cast type rule, determining the value based on the function.
  • the cast type rule comprises at least one of the following: a first rule that the first sidelink transmission comprises a unicast transmission, and the second transmission comprises at least one of: a unicast transmission requesting feedback, or a groupcast transmission requesting feedback, or a second rule that the first sidelink transmission comprises a groupcast transmission and the second transmission comprises a groupcast transmission requesting feedback.
  • determining the value of the at least one channel access parameter comprises: determining that a channel occupancy time is unavailable for a plurality of feedback transmissions of the sidelink transmissions; and based on the determining that the channel occupancy time is unavailable, determining the value of the at least one channel access parameter, the value of the at least one channel access parameter being used for a type 1 channel access procedure for the feedback transmission on the same feedback occasion.
  • the method 700 further comprises in accordance with a detection of a further sidelink transmission subsequent to the type 1 channel access procedure for first feedback transmission on the same feedback occasion and prior to the first feedback transmission, determining that a second value of the at least one channel access parameter of further feedback of the further sidelink transmission is associated to a second transmission priority higher than a first transmission priority of the first feedback transmission; and based on the determining that the second value is associated to the second transmission priority higher than the first transmission priority, decreasing a time duration for the type 1 channel access procedure.
  • the method 700 further comprises receiving, from a second device 202, channel access configuration information.
  • the channel access configuration information may include at least one of the following: the function for determining the value of the at least one channel access parameter, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated with the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining whether the value of the at least one channel access parameter is to be updated based on the function.
  • the second device 202 may include a terminal device.
  • the second device 202 may include a network device.
  • FIG. 8 shows a flowchart of an example method 800 implemented at a second device in accordance with some example embodiments of the present disclosure.
  • the method 800 will be described from the perspective of the second device 202 in FIG. 2.
  • the second device 202 may include a terminal device or a network device.
  • the second device 202 transmits channel access configuration information to a first device 201.
  • the second device 202 may include a terminal device or a network device
  • the first device 201 may include a terminal device.
  • the channel access configuration information comprises at least one of the following: a function for determining a value of at least one channel access parameter from a plurality of values of the at least one channel access parameter, the value of the at least one channel access parameter being used for transmitting feedback of sidelink transmissions of the first device, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated to the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining the value of the at least one channel access parameter is to be updated based on the function.
  • the function may indicate that a minimum value or a maximum value of the at least one channel access parameter is to be selected.
  • the method 700 or the method 800 may include additional blocks not shown and/or may omit some shown blocks, and the scope of the present disclosure is not limited in this regard.
  • a first apparatus capable of performing any of the method 700 may comprise means for performing the respective operations of the method 700.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the first apparatus may be implemented as or included in the first device 201 in FIG. 2.
  • the first apparatus comprises means for obtaining sidelink control information of sidelink transmissions with feedback associated with a same feedback occasion of the first apparatus; means for obtaining respective values of at least one channel access parameter associated with the feedback of the sidelink transmissions based on the sidelink control information; and means for determining a value of the at least one channel access parameter for transmitting the feedback of the sidelink transmissions on the same feedback occasion of the first apparatus as a function of the respective values of the at least one channel access parameter.
  • the means for obtaining the respective values of the at least one channel access parameter associated with the feedback of the sidelink transmissions comprises one of the following: means for obtaining the respective values of the at least one channel access parameter based on an explicit channel access priority class indication comprised in the sidelink control information; or means for obtaining the respective values of the at least one channel access parameter based on respective data priorities of the sidelink transmissions and an association rule between a channel access priority class and a data priority, the association rule being indicated in the sidelink control information.
  • the at least one channel access parameter comprises at least one of the following: a channel access priority class, or a size of a contention window.
  • the means for determining the value of the at least one channel access parameter as a function of the respective values of the at least one channel access parameter comprises at least one of the following: means for selecting a minimum value among the respective values as the value; or means for selecting a maximum value among the respective values as the value.
  • the means for determining the value of the at least one channel access parameter comprises: means for determining that the number of a plurality of feedback transmissions on the same feedback occasion exceed a threshold number; and means for based on the determining that the number of feedback transmissions exceed the threshold number, determining the value based on the function.
  • the means for determining the value of the at least one channel access parameter comprises: means for determining that at least one of a first sidelink transmission of the sidelink transmissions or a second sidelink transmission meets a cast type rule; and means for based on the determining that at least one of the first or second sidelink transmission meets the cast type rule, determining the value based on the function.
  • the cast type rule comprises at least one of the following: a first rule that the first sidelink transmission comprises a unicast transmission, and the second transmission comprises at least one of: a unicast transmission requesting feedback, or a groupcast transmission requesting feedback, or a second rule that the first sidelink transmission comprises a groupcast transmission and the second transmission comprises a groupcast transmission requesting feedback.
  • the means for determining the value of the at least one channel access parameter comprises: means for determining that a channel occupancy time is unavailable for a plurality of feedback transmissions of the sidelink transmissions; and means for based on the determining that the channel occupancy time is unavailable, determining the value of the at least one channel access parameter.
  • the value of the at least one channel access parameter may be used for a type 1 channel access procedure for the feedback transmission on the same feedback occasion.
  • the first apparatus further comprises in accordance with a detection of a further sidelink transmission subsequent to the type 1 channel access procedure for first feedback transmission on the same feedback occasion and prior to the first feedback transmission, means for determining that a second value of the at least one channel access parameter of further feedback of the further sidelink transmission is associated to a second transmission priority higher than a first transmission priority of the first feedback transmission; and means for based on the determining that the second value is associated to the second transmission priority higher than the first transmission priority, decreasing a time duration for the type 1 channel access procedure.
  • the first apparatus may further comprise means for receiving, from a second apparatus, channel access configuration information.
  • the channel access configuration information may include at least one of the following: the function for determining the value of the at least one channel access parameter, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated with the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining whether the value of the at least one channel access parameter is to be updated based on the function.
  • the first apparatus comprises a terminal apparatus
  • the second apparatus comprises a terminal apparatus or a network apparatus.
  • the first apparatus further comprises means for performing other operations in some example embodiments of the method 700 or the first device 201.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the first apparatus.
  • a second apparatus capable of performing any of the method 800 may comprise means for performing the respective operations of the method 800.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the second apparatus may be implemented as or included in the second device 202 in FIG. 2.
  • the second apparatus comprises means for transmitting channel access configuration information to a first apparatus.
  • the channel access configuration information comprises at least one of the following: a function for determining a value of at least one channel access parameter from a plurality of values of the at least one channel access parameter, the value of the at least one channel access parameter being used for transmitting feedback of sidelink transmissions of the first device, a mapping rule between a sidelink transmission priority and an associated value of the at least one channel access parameter for the feedback associated to the sidelink transmissions, a threshold number for determining whether the value of the at least one channel access parameter is to be updated based on the function, or a cast type rule for determining the value of the at least one channel access parameter is to be updated based on the function.
  • the function may indicate that a minimum value or a maximum value of the at least one channel access parameter is to be selected.
  • the first apparatus comprises a terminal apparatus
  • the second apparatus comprises a terminal apparatus or a network apparatus.
  • the second apparatus further comprises means for performing other operations in some example embodiments of the method 800 or the second device 202.
  • the means comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the performance of the second apparatus.
  • FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing example embodiments of the present disclosure.
  • the device 900 may be provided to implement a communication device, for example, the devices 110, 120, 130 or 140 as shown in FIG. 1, or the first device 201 or the second device 202 as shown in FIG. 2.
  • the device 900 includes one or more processors 910, one or more memories 920 coupled to the processor 910, and one or more communication modules 940 coupled to the processor 910.
  • the communication module 940 is for bidirectional communications.
  • the communication module 940 has one or more communication interfaces to facilitate communication with one or more other modules or devices.
  • the communication interfaces may represent any interface that is necessary for communication with other network elements.
  • the communication module 940 may include at least one antenna.
  • the processor 910 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 900 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 920 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 924, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , an optical disk, a laser disk, and other magnetic storage and/or optical storage.
  • ROM Read Only Memory
  • EPROM electrically programmable read only memory
  • flash memory a hard disk
  • CD compact disc
  • DVD digital video disk
  • optical disk a laser disk
  • RAM random access memory
  • a computer program 930 includes computer executable instructions that are executed by the associated processor 910.
  • the instructions of the program 930 may include instructions for performing operations/acts of some example embodiments of the present disclosure.
  • the program 930 may be stored in the memory, e.g., the ROM 924.
  • the processor 910 may perform any suitable actions and processing by loading the program 930 into the RAM 922.
  • the example embodiments of the present disclosure may be implemented by means of the program 930 so that the device 900 may perform any process of the disclosure as discussed with reference to FIG. 2 and FIG. 6 to FIG. 8.
  • the example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 930 may be tangibly contained in a computer readable medium which may be included in the device 900 (such as in the memory 920) or other storage devices that are accessible by the device 900.
  • the device 900 may load the program 930 from the computer readable medium to the RAM 922 for execution.
  • the computer readable medium may include any types of non-transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • the term “non-transitory, ” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .
  • FIG. 10 shows an example of the computer readable medium 1000 which may be in form of CD, DVD or other optical storage disk.
  • the computer readable medium 1000 has the program 930 stored thereon.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • Some example embodiments of the present disclosure also provides at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages.
  • the program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program code or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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Abstract

Des exemples de modes de réalisation de la présente divulgation concernent des améliorations apportées à une transmission de rétroaction de liaison latérale (SL). Un premier dispositif obtient des informations de commande de liaison latérale relatives à des transmissions de liaison latérale avec une rétroaction associée à une même occasion de rétroaction du premier dispositif. Le premier dispositif obtient en outre des valeurs respectives d'au moins un paramètre d'accès au canal associé à la rétroaction des transmissions de liaison latérale, sur la base des informations de commande de liaison latérale. Le premier dispositif détermine en outre une valeur du ou des paramètres d'accès au canal pour transmettre la rétroaction des transmissions de liaison latérale sur la même occasion de rétroaction du premier dispositif, en fonction des valeurs respectives du ou des paramètres d'accès au canal. De cette manière, la transmission de rétroaction de liaison latérale peut être améliorée.
PCT/CN2022/111579 2022-08-10 2022-08-10 Amélioration de transmission de rétroaction de liaison latérale WO2024031482A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021081700A1 (fr) * 2019-10-28 2021-05-06 华为技术有限公司 Procédé et appareil d'envoi et de réception de données
WO2021212354A1 (fr) * 2020-04-22 2021-10-28 Lenovo (Beijing) Limited Procédé et appareil de partage du temps d'occupation d'un canal
US20220053496A1 (en) * 2018-09-26 2022-02-17 Lenovo (Beijing) Limited Method and apparatus for sidelink communication
WO2022073010A1 (fr) * 2020-09-30 2022-04-07 Qualcomm Incorporated Transmission de retour de demande harq pour communication sur liaison latérale dans un spectre sans licence
US20220225279A1 (en) * 2021-01-12 2022-07-14 Qualcomm Incorporated Sidelink feedback channel signaling in new radio sidelink

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220053496A1 (en) * 2018-09-26 2022-02-17 Lenovo (Beijing) Limited Method and apparatus for sidelink communication
WO2021081700A1 (fr) * 2019-10-28 2021-05-06 华为技术有限公司 Procédé et appareil d'envoi et de réception de données
WO2021212354A1 (fr) * 2020-04-22 2021-10-28 Lenovo (Beijing) Limited Procédé et appareil de partage du temps d'occupation d'un canal
WO2022073010A1 (fr) * 2020-09-30 2022-04-07 Qualcomm Incorporated Transmission de retour de demande harq pour communication sur liaison latérale dans un spectre sans licence
US20220225279A1 (en) * 2021-01-12 2022-07-14 Qualcomm Incorporated Sidelink feedback channel signaling in new radio sidelink

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LG ELECTRONICS: "Discussion on channel access mechanism for sidelink on unlicensed spectrum", 3GPP TSG RAN WG1 MEETING #109-E R1-2203713, 29 April 2022 (2022-04-29), XP052153133 *

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