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WO2024119312A1 - Procédé, dispositif et support lisible par ordinateur pour communications de liaison latérale - Google Patents

Procédé, dispositif et support lisible par ordinateur pour communications de liaison latérale Download PDF

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Publication number
WO2024119312A1
WO2024119312A1 PCT/CN2022/136591 CN2022136591W WO2024119312A1 WO 2024119312 A1 WO2024119312 A1 WO 2024119312A1 CN 2022136591 W CN2022136591 W CN 2022136591W WO 2024119312 A1 WO2024119312 A1 WO 2024119312A1
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WIPO (PCT)
Prior art keywords
resource
candidate resource
starting symbol
sidelink
candidate
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PCT/CN2022/136591
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English (en)
Inventor
Jin Yang
Zhaobang MIAO
Gang Wang
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NEC Corp
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NEC Corp
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Priority to PCT/CN2022/136591 priority Critical patent/WO2024119312A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/02—Selection of wireless resources by user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to a method, device and computer readable medium for sidelink communications.
  • SL-U Sidelink in unlicensed spectrum or band
  • 3GPP 3rd Generation Partnership Project
  • SL-U should base on New Radio (NR) sidelink and NR-U.
  • NR New Radio
  • terminal devices may transmit one or multiple transmission blocks (TBs) on a first starting symbols and/or a second starting symbol.
  • TBs transmission blocks
  • example embodiments of the present disclosure provide methods, devices and computer readable media for sidelink communications.
  • a method for sidelink communications comprises: determining, at a terminal device, a first candidate resource set which comprises at least one candidate resource for sidelink transmission, wherein each of the at least one candidate resource in the first candidate resource set is associated with a first starting symbol or a second starting symbol in a slot; determining a second candidate resource set which is a subset of the first candidate resource set; and reporting the second candidate resource set to higher layer.
  • a terminal device comprising a processor and a memory storing instructions.
  • the memory and the instructions are configured, with the processor, to cause the terminal device to perform the method according to the first aspect.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor of a device, cause the device to perform the method according to the first aspect.
  • Fig. 1 illustrates an example communication network in which embodiments of the present disclosure can be implemented
  • Fig. 2 illustrates an example of a timing resource allocation in a sidelink resource pool in accordance with some embodiments of the present disclosure
  • Fig. 3 illustrates an example of a symbol allocation in a sidelink slot in accordance with some embodiments of the present disclosure
  • Fig. 4 illustrates an example of a frequency resource allocation in a sidelink resource pool in accordance with some embodiments of the present disclosure
  • Fig. 5 illustrates an example of sidelink channels in time domain in accordance with some embodiments of the present disclosure
  • Fig. 6 illustrates an example of a symbol allocation in a sidelink subframe in accordance with other embodiments of the present disclosure
  • Fig. 7 illustrates an example of feedback channel resources in time domain in accordance with some embodiments of the present disclosure
  • Fig. 8 illustrates an example of IRBs in an NR-U IRB scheme in accordance with some embodiments of the present disclosure
  • Fig. 9 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • Figs. 10A and 10B illustrate an example of the number of sub-channels for different candidate resources in accordance with some embodiments of the present disclosure, respectively;
  • Fig. 11 illustrates an example of performing an initial transmission and a retransmission for a TB within a slot in accordance with some embodiments of the present disclosure
  • Figs. 12A, 12B and 12C illustrate an example of resource excluding in accordance with some embodiments of the present disclosure, respectively.
  • Fig. 13 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, devices for Integrated Access and Backhaul (IAB) , Small Data Transmission (SDT) , mobility, Multicast and Broadcast Services (MBS) , positioning, dynamic/flexible duplex in commercial networks, reduced capability (RedCap) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eX
  • UE user equipment
  • the ‘terminal device’ can further has ‘multicast/broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4/IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM.
  • SIM Subscriber Identity Module
  • the term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
  • network device refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , Network-controlled Repeaters, and the like.
  • NodeB Node B
  • eNodeB or eNB evolved NodeB
  • gNB next generation NodeB
  • TRP transmission reception point
  • RRU remote radio unit
  • RH radio head
  • RRH remote radio head
  • IAB node a low power node such
  • the terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
  • AI Artificial intelligence
  • Machine learning capability it generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
  • the terminal or the network device may work on several frequency ranges, e.g. FR1 (410 MHz –7125 MHz) , FR2 (24.25GHz to 71GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed/unlicensed/shared spectrum.
  • the terminal device may have more than one connection with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario.
  • MR-DC Multi-Radio Dual Connectivity
  • the terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
  • the network device may have the function of network energy saving, Self-Organizing Networks (SON) /Minimization of Drive Tests (MDT) .
  • the terminal may have the function of power saving.
  • test equipment e.g. signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator
  • the embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future.
  • Examples of the communication protocols include, 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, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.
  • the singular forms ‘a’ , ‘an’ and ‘the’ are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the term ‘includes’ and its variants are to be read as open terms that mean ‘includes, but is not limited to. ’
  • the term ‘based on’ is to be read as ‘at least in part based on. ’
  • the term ‘some embodiments’ and ‘an embodiment’ are to be read as ‘at least some embodiments. ’
  • the term ‘another embodiment’ is to be read as ‘at least one other embodiment. ’
  • the terms ‘first, ’ ‘second, ’ and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
  • values, procedures, or apparatus are referred to as ‘best, ’ ‘lowest, ’ ‘highest, ’ ‘minimum, ’ ‘maximum, ’ or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • Fig. 1 illustrates a schematic diagram of an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the communication network 100 may include a terminal device 110, a terminal device 120, a terminal device 130, network devices 140 and 150.
  • the network devices 140 and 150 may communicate with the terminal device 110, the terminal device 120 and the terminal device 130 via respective wireless communication channels.
  • the network device 140 may be a gNB in NR.
  • the network device 140 may be also referred to as an NR network device 140.
  • the network device 150 may be an eNB in Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the network device 150 may be also referred to as an LTE network device 150.
  • the communication network 100 may include any suitable number of network devices and/or terminal devices adapted for implementing embodiments of the present disclosure.
  • the communications in the communication network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , LTE, LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like.
  • GSM Global System for Mobile Communications
  • LTE LTE
  • LTE-Evolution LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • MTC Machine Type Communication
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, 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)
  • the communications in the communication network 100 may comprise sidelink communication.
  • Sidelink communication is a wireless radio communication directly between two or more terminal devices, such as two or more terminal devices among the terminal device 110, the terminal device 120 and the terminal device 130.
  • the two or more terminal devices that are geographically proximate to each other can directly communicate without going through the network device 140 or 150 or through a core network.
  • Data transmission in sidelink communication is thus different from typical cellular network communications, in which a terminal device transmits data to the network device 140 or 150 (i.e., uplink transmissions) or receives data from the network device 140 or 150 (i.e., downlink transmissions) .
  • data is transmitted directly from a source terminal device (such as the terminal device 110) to a target terminal device (such as the terminal device 120) through the Unified Air Interface, e.g., PC5 interface, (i.e., sidelink transmissions) , as shown in Fig. 1.
  • Unified Air Interface e.g., PC5 interface
  • Sidelink communication can provide several advantages, including reducing data transmission load on a core network, system resource consumption, transmission power consumption, and network operation costs, saving wireless spectrum resources, and increasing spectrum efficiency of a cellular wireless communication system.
  • a sidelink communication manner includes but is not limited to device to device (D2D) communication, Vehicle-to-Everything (V2X) communication, etc.
  • D2D device to device
  • V2X Vehicle-to-Everything
  • V2X communication enables vehicles to communicate with other vehicles (i.e. Vehicle-to-Vehicle (V2V) communication) , with infrastructure (i.e. Vehicle-to-Infrastructure (V2I) , with wireless networks (i.e. Vehicle-to-Network (V2N) communication) , with pedestrians (i.e. Vehicle-to-Pedestrian (V2P) communication) , and even with the owner's home (i.e. Vehicle-to-Home (V2H) ) .
  • infrastructure include roadside units such as traffic lights, toll gates and the like.
  • V2X communication can be used in a wide range of scenarios, including in accident prevention and safety, convenience, traffic efficiency and clean driving, and ultimately in relation to autonomous or self-driving vehicles.
  • a terminal device uses resources in sidelink resource pools to transmit or receive signals.
  • the sidelink resource pools include resources in time domain and frequency domain, which are dedicated resources of the sidelink communication, or shared by the sidelink communication and a cellular link.
  • two modes of resource allocation may be used for sidelink, including network device schedules sidelink resources for terminal devices to perform sidelink signal transmission, named as mode 1 resource scheme in NR sidelink or mode 3 resource scheme in LTE sidelink, and terminal device selects sidelink resources by itself to perform sidelink signal transmission, named as mode 2 resource scheme in NR sidelink or mode 4 resource scheme in LTE sidelink.
  • Fig. 2 illustrates an example of a timing resource allocation in a sidelink resource pool in accordance with some embodiments of the present disclosure.
  • the sidelink resource pool may comprise an NR sidelink resource pool.
  • the sidelink resource pool may be defined within a sidelink bandwidth part (BWP) .
  • BWP sidelink bandwidth part
  • the terminal device 110, the terminal device 120 and the terminal device 130 may use uplink (UL) resources for sidelink communications. More than one sidelink resource pools may be configured for one of the terminal device 110, the terminal device 120 and the terminal device 130.
  • a dedicated resource pool may be used for mode 1 resource scheme or mode 2 resource scheme, short for mode 1 resource pool or mode 2 resource pool.
  • a dedicated resource pool may be used for mode 3 resource scheme or mode 4 resource scheme, short for mode 3 resource pool or mode 4 resource pool.
  • Resources within the sidelink resource pool may comprise Physical Sidelink Control Channel (PSCCH) resources, Physical Sidelink Shared Channel (PSSCH) resources and physical sidelink feedback channel (PSFCH) resources.
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSFCH physical sidelink feedback channel
  • a bitmap may be used to indicate which UL slots are configured as sidelink slots.
  • a length of the bitmap may be in a range of 10 to 160.
  • Fig. 3 illustrates an example of a symbol allocation in a sidelink slot in accordance with some embodiments of the present disclosure.
  • the sidelink resource pool which may contain multiple slots and resource blocks (RBs) , and all or part of the symbols in a slot can be used for sidelink transmission.
  • the first symbol i.e., the start symbol
  • the last symbol used as a guard period (GP) symbol.
  • AGC symbols and GP symbols can be considered as fixed overheads in sidelink resource.
  • AGC symbols and GP symbols are included in the sidelink symbols which are indicated by the sidelink channel resource configuration, and AGC symbols carry redundancy sidelink information while GP symbols are not used for carrying sidelink information, as shown in Fig. 3.
  • the terminal device 110, the terminal device 120 and the terminal device 130 may use sidelink channels to transmit sidelink signaling or information.
  • the sidelink channels include at least one of the following: a PSCCH resource which is used for carrying sidelink control information (SCI) , a PSSCH resource which is used for carrying sidelink data service information, a PSFCH resource which is used for carrying sidelink Hybrid Automatic Repeat Request (HARQ) feedback information, a physical sidelink broadcast channel (PSBCH) resource which is used for carrying sidelink broadcast information, and a physical sidelink discovery channel (PSDCH) resource which is used for carrying a sidelink discovery signal.
  • SCI sidelink control information
  • PSSCH which is used for carrying sidelink data service information
  • PSFCH resource which is used for carrying sidelink Hybrid Automatic Repeat Request (HARQ) feedback information
  • HARQ Hybrid Automatic Repeat Request
  • PSBCH physical sidelink broadcast channel
  • PSDCH physical sidelink discovery channel
  • Fig. 4 illustrates an example of a frequency resource allocation in a sidelink resource pool in accordance with some embodiments of the present disclosure.
  • the sidelink resource pool may be an NR sidelink resource pool.
  • the sidelink resource pool may be configured within a SL Bandwidth Part (Sidelink BWP) .
  • a resource pool configuration may comprise sl-StartRB-Subchannel and sl-RB-Number.
  • the sl-StartRB-Subchannel may indicate the lowest Resource Block (RB) of the resource pool.
  • the lowest RB is also referred to as a start RB.
  • the sl-RB-Number may indicate the total number of RBs of the resource pool.
  • RBs in the resource pool may be divided into consecutive sub-channels.
  • Sub-channel is a frequency resource unit of PSSCH. Each sub-channel contains consecutive RBs.
  • the terminal devices 110, 120 and 130 may use one or more consecutive sub-channels as a PSSCH resource to transmit sidelink data.
  • a sub-channel configuration of the resource pool may comprise sl-SubchannelSize which indicates the number of RBs contained in one sub-channel.
  • the SubchannelSize may be equal to 10, 12, 15, 20, 25, 50, 75 or 100.
  • Fig. 5 illustrates an example of sidelink channels in time domain in accordance with some embodiments of the present disclosure.
  • the sidelink channels comprise PSCCH and PSSCH.
  • PSCCH may carry SCI format 1.
  • One PSCCH may be defined within each sub-channel.
  • PSSCH may carry SCI format 2A/2B/2C and sidelink data PSSCH uses sub-channel as a frequency unit.
  • the terminal devices 110, 120 and 130 may use one or more consecutive sub-channels as a PSSCH resource to transmit sidelink data.
  • the terminal device 110, the terminal device 120 or the terminal device 130 may use uplink (UL) resources for sidelink communications. More than one sidelink resource pools may be configured for the terminal device 110, the terminal device 120 or the terminal device 130.
  • Resources within the LTE sidelink resource pool may comprise a PSCCH resource pool and a PSSCH resource pool.
  • a bitmap may be used to indicate which UL subframes are configured as sidelink subframes.
  • Fig. 6 illustrates an example of a symbol allocation in a sidelink subframe in accordance with other embodiments of the present disclosure.
  • sidelink subframes in Fig. 6 may be LTE sidelink subframes.
  • all symbols in a subframe are used as sidelink resource.
  • the first symbol is used as AGC and the last symbol is used as GP.
  • LTE sidelink channels may comprise PSCCH and PSSCH.
  • PSCCH may carry SCI format 1.
  • One PSCCH is associated with one sub-channel.
  • Each PSCCH resource has a fixed size.
  • each PSCCH resource may comprise two consecutive PRBs and all symbols in a sidelink subframe.
  • PSSCH may carry sidelink data and use sub-channel as frequency unit.
  • the terminal device 110, the terminal device 120 or the terminal device 130 may use one or more consecutive sub-channels as PSSCH resource to transmit sidelink data. Relationship between PSCCH and PSSCH may be one-to-one mapping.
  • a PSFCH resource within a resource pool, whether a PSFCH resource is available should be configured or pre-configured.
  • PSCCH or PSSCH resources are presented in every slot and used for transmitting sidelink data packet.
  • the last three SL symbols (AGC+PSFCH+GP) are used for PSFCH related, as shown in Fig. 7.
  • a PSFCH resource may comprises one RB in frequency domain and one symbol in time domain (AGC symbol is repeated) .
  • the PSFCH resource may carry 1 bit ACK/NACK information.
  • the PSFCH resource may be related to one sub-channel in one slot.
  • IRB is used as a frequency resource unit for NR-U uplink.
  • Fig. 8 illustrates an example of an RB set and IRB in an NR-U IRB scheme in accordance with some embodiments of the present disclosure.
  • each of the RB sets may be defined as 20 MHz.
  • SCS Subcarrier Spacing
  • each of the RB sets may comprises 100 to 110 RBs.
  • SCS Subcarrier Spacing
  • each of the RB sets may comprises 50 to 55 RBs.
  • BWPs #1 and #2 are defined within a system carrier.
  • the BWP #1 comprises RB sets #0 and #1.
  • the BWP #2 comprises RB sets #2 and #3. It will be understood that although it is shown in Fig. 8 that each of BWPs comprises a plurality of RB sets, in some embodiments, one or more of the BWPs may comprise a single RB set.
  • IRB and “interlace” may be used interchangeably.
  • IRBs or interlaces are defined within a system carrier.
  • An IRB with an index 0 starts from a Common Resource Block (CRB) with an index 0 (i.e., CRB#0) .
  • CRB Common Resource Block
  • SCS of 15kHz 10 interlaces may be defined within the system carrier.
  • SL-U For SL-U, if only one common starting symbol is allocated in a slot for sidelink transmission, sidelink transmissions of PSCCH and/or PSSCH are simple to be determined, including resource indication, resource reservation, determining of a transmission block size (TBS) and so on. As two starting symbols are supported in SL-U, the relevant issues to be studied and addressed.
  • TBS transmission block size
  • a terminal device determines a first candidate resource set which comprises at least one candidate resource for sidelink transmission. Each of the at least one candidate resource in the first candidate resource set is associated with a first starting symbol or a second starting symbol in a slot. Then, the terminal device determines a second candidate resource set which is a subset of the first candidate resource set. In turn, the terminal device reports the second candidate resource set to higher layer of the terminal device. In this way, sidelink transmissions may be performed on at least one of the candidate resources.
  • Fig. 9 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • the method 900 can be implemented at a communication device, such as one of the terminal device 110, the terminal device 120 and the terminal device 130 as shown in Fig. 1.
  • the method 900 will be described with reference to Fig. 1 as performed by the terminal device 110 without loss of generality.
  • the terminal device 110 determines a first candidate resource set which comprises at least one candidate resource for sidelink transmission.
  • Each of the at least one candidate resource in the first candidate resource set is associated with a first starting symbol or a second starting symbol in a slot.
  • the first candidate resource set may be initialized to the set of all the candidate single-slot resources in a resource selection window.
  • the terminal device 110 determines a second candidate resource set which is a subset of the first candidate resource set.
  • the terminal device 110 reports the second candidate resource set to higher layer of the terminal device 110.
  • the higher layer may select one or more candidate resources from the second candidate resource set for sidelink transmission.
  • the at least one candidate resource in the first candidate resource set is associated with the first starting symbol.
  • the at least one candidate resource in the first candidate resource set is associated with the second starting symbol.
  • the first candidate resource set comprises one or more candidate resources
  • all of the one or more candidate resources in the first candidate resource set are associated with the first starting symbol, or all of the one or more candidate resources in the first candidate resource set are associated with the second starting symbol.
  • the same starting symbol must be selected for all the candidate resources.
  • the terminal device 110 may select sidelink resources by itself to perform a sidelink transmission, which is named as mode 2 resource scheme in NR sidelink.
  • the terminal device 110 may perform a mode 2 sensing procedure on sidelink and resource selection procedure based on candidate resources in the first candidate resource set, and further determine the second candidate resource set.
  • the mode 2 sensing and resource selection procedure is also referred to as a mode 2 resource selection procedure.
  • the selected candidate resources should be associated with the same starting symbol, either the first starting symbol or the second starting symbol. That is, it is not allowed to use both the starting symbols in different slots for transmissions of the same transmission block (TB) .
  • a candidate resource which starts from the second starting symbol it should be defined in a slot which does not contain PSFCH resources.
  • s 0 or 4.
  • Locations of starting symbols are predefined in system.
  • s sl-StartSymbol or sl-StartSymbol2.
  • sl-StartSymbol is a symbol index of the first starting symbol in a slot and may be equal to one of 0, 1, ..., and 7.
  • sl-StartSymbol2 is a symbol index of the second starting symbol in a slot and may be equal to one of 4, 5, ..., and 10.
  • At least one of sl-StartSymbol or sl-StartSymbol2 may be configured or pre-configured by higher layer of the terminal device 110.
  • R x, y should be defined in a slot without PSFCH resources.
  • This embodiment requires less standard modification on legacy schemes, and is easier for relevant issues design.
  • the first candidate resource set comprises at least one of a first candidate resource associated with the first starting symbol or a second candidate resource associated with the second starting symbol.
  • the first candidate resource set may only comprise the first candidate resource associated with the first starting symbol.
  • the first candidate resource set may only comprise the second candidate resource associated with the second starting symbol.
  • the first candidate resource set may comprise both of the first candidate resource and the second candidate resource.
  • different starting symbols may be selected among candidate resources.
  • the selected candidate resources can use the first starting symbol or the second starting symbol in different slots. That is, both the resources with the first and second starting symbols can be selected as candidate resources, and there is no limitation for the resource selection. It is allowed to use different starting symbols in different slots for each transmission.
  • a candidate resource which starts from the second starting symbol it should be defined in a slot which does not contains PSFCH resources.
  • This embodiment introduces less limitation on the mode 2 resource selection procedure and provides more flexibility for SL-U resource selection.
  • the first candidate resource set may comprise at least one of a first subset of candidate resources or a second subset of candidate resources.
  • Each of the candidate resources in the first subset is associated with the first starting symbol and comprises a first number of sub-channels or IRBs.
  • the first number may be represented by K1.
  • Each of the candidate resources in the second subset is associated with the second starting symbol and comprises a second number of sub-channels or IRBs.
  • the second number may be represented by K2.
  • Such embodiments may provide more flexibility for transmissions with two starting symbol resource structure.
  • such embodiments may maintain stable resource quantity for multiple transmissions and benefit decoding combination.
  • the number of sub-channels or IRBs for each candidate resource may be different.
  • the first number and the second number may be independently determined by the terminal device 110 or scheduled by the network device 140 or 150.
  • the first number may be determined based on the second number. For example, for the case that an initial transmission uses the second starting symbol, the first number may be determined based on the second number.
  • the second number may be determined based on the first number. For example, for the case that an initial transmission uses the first starting symbol, the second number may be determined based on the first number.
  • the first number may be equal to or less than the second number.
  • the terminal device 110 may determine the first number by rounding up the second number divided by a third number. For example, the terminal device 110 may determine the first number based on the following:
  • K1 represents the first number
  • K2 represents the second number
  • A represents the third number
  • the terminal device 110 may determine the second number as a product of the third number and the first number. For example, the terminal device 110 may determine the second number based on the following:
  • the third number may be determined based on locations of the first starting symbol and the second starting symbol in a slot.
  • the third number may be configured or pre-configured.
  • the third number may be determined by rounding up a fourth number divided by a fifth number.
  • the fourth number may be equal to the number of symbols from the first starting symbol to an end sidelink symbol in the slot
  • the fifth number may be equal to the number of symbols from the second starting symbol to the end sidelink symbol in the slot.
  • the terminal device 110 may determine the third number based on the following:
  • L1 represents the fourth number
  • L2 represents the fifth number
  • the third number may be determined by rounding down the fourth number divided by the fifth number.
  • the terminal device 110 may determine the third number based on the following:
  • Figs. 10A and 10B illustrate an example of the number of sub-channels for different candidate resources in accordance with some embodiments of the present disclosure, respectively.
  • the terminal device 110 selects three candidate resources for a TB, i.e., for an initial transmission and two retransmissions for the TB.
  • the initial transmission uses a resource which starts from the second starting symbol in slot #n.
  • the retransmissions use resources which start from the first starting symbol in slots #n+1 and #n+2.
  • the first starting symbol is symbol #0
  • the second starting symbol is symbol #7.
  • the terminal device 110 should use two sub-channels for the retransmissions for the same TB.
  • the terminal device 110 selects two candidate resources for a TB, i.e., for an initial transmission and a retransmission for the TB.
  • the initial transmission uses a resource which starts from the first starting symbol in slot #n which contains PSFCH resources.
  • the retransmission uses a resource which starts from the second starting symbol in slot #n+k which does not contains PSFCH resources.
  • the first starting symbol is symbol #0, and the second starting symbol is symbol #4.
  • K1 K2
  • the terminal device 110 should use four sub-channels for the retransmission for the same TB.
  • the terminal device 110 may perform an initial transmission for a TB on a first candidate resource and perform a retransmission for the TB on a second candidate resource.
  • the first candidate resource is comprised in the second candidate resource set and is associated with the first starting symbol.
  • the second candidate resource is comprised in the second candidate resource set and is associated with the second starting symbol in the same slot of the first candidate resource.
  • the terminal device 110 may perform the initial transmission and the retransmission for the TB within one slot.
  • the initial transmission uses the first starting symbol
  • the retransmission uses the second starting symbol.
  • SCI transmitted by the terminal device 110 is also referred to as “second SCI” while SCI received by the terminal device 110 is also referred to as “first SCI” .
  • Fig. 11 illustrates an example of performing an initial transmission and a retransmission for a TB within a slot in accordance with some embodiments of the present disclosure.
  • the terminal device 110 determines to perform an initial transmission and a retransmission of a TB within one slot.
  • the initial transmission starts from symbol #0 with IRBs #0 ⁇ #4.
  • the retransmission starts from symbol #7 with IRBs #5 ⁇ #9.
  • SCI is transmitted on a PSCCH resource associated with the initial transmission.
  • the SCI indicates information about the initial transmission and retransmission;
  • the example of Fig. 11 may enhance blind retransmission with less latency and mitigate potential resource collision and in-band emission.
  • modifications in the legacy mode 2 resource selection procedure may be needed.
  • the resource excluding steps in the legacy mode 2 resource selection procedure may be modified.
  • modifications in the legacy mode 2 resource selection procedure will be described.
  • the at least one candidate resource in the first candidate resource set is associated with the first starting symbol, or the at least one candidate resource in the first candidate resource set is associated with the second starting symbol.
  • the terminal device 110 may determine the second candidate resource set by excluding a candidate resource from the first candidate resource set if all the following conditions are met:
  • ⁇ first SCI is received on a PSCCH resource and indicates at least one of a priority of a sidelink transmission or a resource reservation period, wherein the PSCCH resource is associated with the first starting symbol or the second starting symbol;
  • ⁇ a first reserved resource indicated by the first SCI overlaps or partially overlaps with the candidate resource.
  • the candidate resource in the first candidate resource set is associated with the first or second starting symbol, the candidate resource will be excluded from the first candidate resource set if all the above conditions are met.
  • the modified mode 2 resource selection procedure may make it coordinate with two starting symbols structure and avoid resource selection collision which may be caused by the second starting symbol additionally.
  • the following modification may be added to the legacy mode 2 resource selection procedure:
  • the terminal device 110 shall exclude any candidate single-slot resource R x, y from the candidate resource set S A (i.e., the first candidate resource set) if it meets all the following conditions:
  • the terminal device 110 receives an SCI format 1-A in slot and 'Resource reservation period' field, if present, and 'Priority' field in the received SCI format 1-A indicate the values P rsvp_RX and prio RX , respectively;
  • the RSRP measurement performed for the received SCI format 1-A is higher than Th (prio RX , prio TX ) ;
  • prio RX is the priority indicated in the SCI
  • prio TX is the priority of TB to be transmitted
  • P rsvp_RX is the period indicated in the SCI
  • P′ rsvp_RX is P rsvp_RX converted to units of logical slots of sidelink.
  • Figs. 12A and 12B illustrate an example of the resource excluding in accordance with some embodiments of the present disclosure, respectively.
  • the terminal device 110 performs the modified mode 2 resource selection procedure of the present disclosure to select candidate resources for its sidelink transmission which start from the first starting symbol.
  • #s represents the first starting symbol while #s’ represents the second starting symbol.
  • the terminal device 110 may perform sensing and exclude unsuitable resources which start from symbol #0 or symbol #7.
  • received SCI indicates a reserved resource with a period P1 in slot #n with sub-channel #2, which starts from the first starting symbol s;
  • received SCI indicates a reserved resource with a period P2 in slot #n with sub-channel #3, which starts from the second starting symbol#s’;
  • the reserved resources indicated by the SCI in slots #m1 and #m2 are partially overlapped with the candidate resource R 2, n , and the relevant priority and RSRP of the reserved resources meet the RSRP threshold;
  • the terminal device 110 should exclude the R 2, n from the candidate resource set S A (i.e., the first candidate resource set) .
  • the terminal device 110 performs the modified mode 2 resource selection procedure of the present disclosure to select candidate resources for its sidelink transmission which start from the second starting symbol.
  • #s represents the second starting symbol while #s’ represents the first starting symbol.
  • the terminal device 110 may perform sensing and exclude unsuitable resources which start from symbol #0 or symbol #4.
  • received SCI indicates a reserved resource with a period P1 in slot #n with sub-channel #2, which starts from the first starting symbol;
  • received SCI indicates a reserved resource for retransmission in slot #n with sub-channel #3; which starts from the second starting symbol;
  • the reserved resources indicated by the SCI in slots #m1 and #m2 are overlapped with the candidate resource R 2, n , and the relevant priority and RSRP of the reserved resource meet the RSRP threshold;
  • the terminal device 110 should exclude the R 2, n from the candidate resource set S A (i.e., the first candidate resource set) .
  • the terminal device 110 may determine the second candidate resource set by excluding the first candidate resource or the second candidate resource from the first candidate resource set if all the following conditions are met:
  • ⁇ first SCI is received on a PSCCH resource and indicates at least one of a priority of a sidelink transmission or a resource reservation period, wherein the PSCCH resource is associated with the first starting symbol or the second starting symbol;
  • an RSRP measurement performed for the PSCCH resource or an associated PSSCH resource is higher than an RSRP threshold
  • ⁇ a first reserved resource indicated by the first SCI overlaps or partially overlaps with the first candidate resource or the second candidate resource.
  • the modified mode 2 resource selection procedure may make it coordinate with two starting symbols structure and avoid resource selection collision which may be caused by the second starting symbol additionally.
  • the following modification may be added to the legacy mode 2 resource selection procedure:
  • the terminal device 110 shall exclude any candidate single-slot resource or from the candidate resource set S A (i.e., the first candidate resource set) if it meets all the following conditions:
  • the terminal device 110 receives an SCI format 1-A in slot and 'Resource reservation period' field, if present, and 'Priority' field in the received SCI format 1-A indicate the values P rsvp_RX and prio RX , respectively;
  • the SCI format 1-A includes the ones received on a PSCCH resource which is associated with symbols #s1 and #s2;
  • the RSRP measurement performed for the received SCI format 1-A is higher than Th (prio RX , prio TX ) ;
  • prio RX is the priority indicated in the SCI
  • prio TX is the priority of TB to be transmitted
  • P rsvp_RX is the period indicated in the SCI
  • P′ rsvp_RX is P rsvp_RX converted to units of logical slots of sidelink.
  • Fig. 12C illustrates an example of the resource excluding in accordance with some embodiments of the present disclosure.
  • the terminal device 110 performs the modified mode 2 resource selection procedure of the present disclosure to select candidate resources for its sidelink transmission, and resources starting from the first starting symbol and the second starting symbols are both considered as candidate resources.
  • S1 represents the first starting symbol while s2 represents the second starting symbol.
  • the terminal device 110 may perform sensing and exclude unsuitable resources which start from symbol #0 or symbol #7.
  • candidate resources include the following:
  • received SCI indicates a reserved resource with a period P1 in slot #n1 with sub-channel #4, which starts from the first starting symbol, and it is partially overlapped with
  • received SCI indicates a reserved resource with a period P2 in slot #n2 with sub-channel #4, which starts from the second starting symbol, and it is partially overlapped with
  • the candidate resources meet the conditions to be excluded from the candidate resource set S A (i.e., the first candidate resource set) ;
  • the terminal device 110 should exclude the and from the candidate resource set S A .
  • the higher layer may select one or more candidate resources from the second candidate resource set for sidelink transmission.
  • the terminal device 110 may perform a first sidelink transmission on a candidate resource comprised in the second candidate resource set. In some embodiments, performing the first sidelink transmission may comprises transmitting second SCI on a PSCCH resource associated with the candidate resource.
  • the second candidate resource set may comprise at least one of the first candidate resource associated with the first starting symbol or the second candidate resource associated with the second starting symbol.
  • the starting symbols used for current transmission and next one or more transmissions may be different.
  • the starting symbol used for one or more reserved resources needs to be indicated in the second SCI.
  • the current transmission is also referred to as a first sidelink transmission while the next transmission is also referred to as a second sidelink transmission.
  • the second SCI may indicate at least one of the following:
  • ⁇ a first indication which indicates that a starting symbol for the second sidelink transmission is the same as or different from a starting symbol for the first sidelink transmission
  • ⁇ a second indication which indicates that the starting symbol for the second sidelink transmission is the first starting symbol or the second starting symbol.
  • the second sidelink transmission is a retransmission of the first sidelink transmission or a periodical transmission associated with the first sidelink transmission.
  • a first starting symbol indicator (i.e., the first indication) is included in SCI format 1-A for SL-U.
  • the first starting symbol indicator may have an overhead of 1 bit and indicate whether a starting symbol for the next transmission is the same as or different from a starting symbol for the current transmission.
  • first starting symbol indicator is set to be “1” , it indicates that the starting symbol for the next transmission is different from the starting symbol for the current transmission. If the first starting symbol indicator is set to be “0” , it indicates that the starting symbol for the next transmission is the same as the starting symbol for the current transmission.
  • a second starting symbol indicator (i.e., the second indication) is included in SCI format 1-A for SL-U.
  • the second starting symbol indicator may have an overhead of 1 bit and indicate the starting symbol for the next sidelink transmission is the first starting symbol or the second starting symbol.
  • the second starting symbol indicator is set to be “0” , it indicates that the starting symbol for the next transmission is the first starting symbol. If the second starting symbol indicator is set to be “1” , it indicates that the starting symbol for the next transmission is the second starting symbol.
  • more than one resources are reserved in the second SCI, and the second SCI may indicate the starting symbol for each of the reserved resources.
  • the second SCI may comprise m bits for the more than one reserved resources.
  • the second SCI may comprise a bitmap indication, i.e., one bit for each reserved resource.
  • the second SCI may employ each bit indication scheme. The each bit indication scheme may use the first example or the second example as described above.
  • Such embodiments may provide essential indication for sidelink resource reservation with two starting symbol structure.
  • the first candidate resource set may comprise at least one of the first subset of candidate resources or the second subset of candidate resources.
  • each of the candidate resources in the first subset is associated with the first starting symbol and comprises the first number (K1) of sub-channels or IRBs
  • each of the candidate resources in the second subset is associated with the second starting symbol and comprises the second number (K2) of sub-channels or IRBs.
  • the second SCI may indicate at least one of the following:
  • Such embodiments may provide essential indication for sidelink resource reservation with two starting symbol structure.
  • the second SCI may indicate K1; and for the second reserved resource with the second starting symbol, the second SCI may indicate K2.
  • the second SCI may indicate resource used for current transmission (PSSCH) through “frequency resource assignment” .
  • K1 When the current transmission starts from the first starting symbol, K1 is indicated in “frequency resource assignment” ; then, for reserved resources with the first starting symbol, K1 is used, and for reserved resources with the second starting symbol, K2 may be determined according to the equation (2) as described above.
  • K2 is indicated in “frequency resource assignment” , vice versa;
  • reserved resources for following periods of transmission are indicated:
  • K2 is determined based on K1, i.e., no indicator is needed in the SCI.
  • the terminal device 110 may perform an initial transmission for a TB on a first candidate resource and perform a retransmission for the TB on a second candidate resource.
  • the first candidate resource is comprised in the second candidate resource set and is associated with the first starting symbol.
  • the second candidate resource is comprised in the second candidate resource set and is associated with the second starting symbol in the same slot of the first candidate resource.
  • the terminal device 110 may transmit second SCI on a PSCCH resource associated with the first candidate resource.
  • no SCI will be transmitted on a PSCCH resource associated with the second candidate resource for retransmission indication.
  • the second SCI may comprise at least one of the following:
  • ⁇ a fourth indication which indicates whether the retransmission in the same slot is to be performed.
  • the second SCI may comprise the fourth indication which indicates whether the retransmission in the same slot is to be performed.
  • An overhead of the fourth indication may be 1 bit. If the fourth indication is set to be “1” , it indicates that the retransmission in the same slot is to be performed. If the fourth indication is set to be “0” , it indicates that the retransmission in the same slot is not to be performed.
  • Fig. 13 is a simplified block diagram of a device 1300 that is suitable for implementing some embodiments of the present disclosure.
  • the device 1300 can be considered as a further example embodiment of one of the terminal devices 110, 120 and 130, or one of the network devices 140 and 150 as shown in Fig. 1. Accordingly, the device 1300 can be implemented at or as at least a part of one of the terminal devices 110, 120 and 130, or one of the network devices 140 and 150.
  • the device 1300 includes a processor 1310, a memory 1320 coupled to the processor 1310, a suitable transmitter (TX) and receiver (RX) 1340 coupled to the processor 1310, and a communication interface coupled to the TX/RX 1340.
  • the memory 1320 stores at least a part of a program 1330.
  • the TX/RX 1340 is for bidirectional communications.
  • the TX/RX 1340 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between gNBs or eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the gNB or eNB, Un interface for communication between the gNB or eNB and a relay node (RN) , or Uu interface for communication between the gNB or eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the gNB or eNB and a relay node (RN)
  • Uu interface for communication between the gNB or eNB and a terminal device.
  • the program 1330 is assumed to include program instructions that, when executed by the associated processor 1310, enable the device 1300 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Figs. 1 to 12C.
  • the embodiments herein may be implemented by computer software executable by the processor 1310 of the device 1300, or by hardware, or by a combination of software and hardware.
  • the processor 1310 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 1310 and memory 1320 may form processing means 1350 adapted to implement various embodiments of the present disclosure.
  • the memory 1320 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1320 is shown in the device 1300, there may be several physically distinct memory modules in the device 1300.
  • the processor 1310 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 1300 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 components included in the apparatuses and/or devices of the present disclosure may be implemented in various manners, including software, hardware, firmware, or any combination thereof.
  • one or more units may be implemented using software and/or firmware, for example, machine-executable instructions stored on the storage medium.
  • parts or all of the units in the apparatuses and/or devices may be implemented, at least in part, by one or more hardware logic components.
  • FPGAs Field-programmable Gate Arrays
  • ASICs Application-specific Integrated Circuits
  • ASSPs Application-specific Standard Products
  • SOCs System-on-a-chip systems
  • CPLDs Complex Programmable Logic Devices

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Abstract

Selon des modes de réalisation, la présente divulgation concerne un procédé, un dispositif et des supports lisibles par ordinateur pour des communications de liaison latérale. Un procédé de communication de liaison latérale consiste en : la détermination, à un dispositif terminal, d'un premier ensemble de ressources candidates qui comprend une ou plusieurs ressources candidates pour une transmission de liaison latérale, chacune desdites une ou plusieurs ressources candidates dans le premier ensemble de ressources candidates étant associée à un premier symbole de départ ou à un second symbole de départ dans un créneau ; la détermination d'un second ensemble de ressources candidates qui est un sous-ensemble du premier ensemble de ressources candidates ; et le rapport du second ensemble de ressources candidates à une couche supérieure.
PCT/CN2022/136591 2022-12-05 2022-12-05 Procédé, dispositif et support lisible par ordinateur pour communications de liaison latérale Ceased WO2024119312A1 (fr)

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CN113271670A (zh) * 2020-02-14 2021-08-17 中国移动通信有限公司研究院 一种直通链路资源的配置方法、终端及基站
WO2021195960A1 (fr) * 2020-03-31 2021-10-07 Lenovo (Beijing) Limited Procédé et appareil pour transmission en liaison latérale basée sur des rafales
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KR20220122494A (ko) * 2021-02-26 2022-09-02 한국전자통신연구원 통신 시스템에서 초기 접속 위한 방법 및 장치

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WO2021195960A1 (fr) * 2020-03-31 2021-10-07 Lenovo (Beijing) Limited Procédé et appareil pour transmission en liaison latérale basée sur des rafales
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