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WO2024229654A1 - Dispositifs, procédés et support lisible par ordinateur pour des communications de liaison latérale - Google Patents

Dispositifs, procédés et support lisible par ordinateur pour des communications de liaison latérale Download PDF

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Publication number
WO2024229654A1
WO2024229654A1 PCT/CN2023/092759 CN2023092759W WO2024229654A1 WO 2024229654 A1 WO2024229654 A1 WO 2024229654A1 CN 2023092759 W CN2023092759 W CN 2023092759W WO 2024229654 A1 WO2024229654 A1 WO 2024229654A1
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WIPO (PCT)
Prior art keywords
terminal device
reference signals
slot
subset
csi
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PCT/CN2023/092759
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English (en)
Inventor
Zhaobang MIAO
Gang Wang
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NEC Corp
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NEC Corp
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Priority to PCT/CN2023/092759 priority Critical patent/WO2024229654A1/fr
Publication of WO2024229654A1 publication Critical patent/WO2024229654A1/fr
Anticipated expiration legal-status Critical
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    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single 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
    • H04L5/0091—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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to devices, methods and computer readable medium for sidelink (SL) communications.
  • SL sidelink
  • Enhanced sidelink operation on Frequency Range 2 (FR2) licensed spectrum may comprise the support of sidelink beam management (including initial beam-pairing, beam maintenance, and beam failure recovery, and so on) by reusing existing sidelink Channel State Information (CSI) framework and reusing Uu beam management concepts wherever possible.
  • sidelink beam management including initial beam-pairing, beam maintenance, and beam failure recovery, and so on
  • CSI Channel State Information
  • existing sidelink CSI framework will cause very large time latency for sidelink beam management.
  • example embodiments of the present disclosure provide devices, methods and computer readable medium for sidelink communications.
  • a first terminal device comprising a processor.
  • the processor is configured to cause the first terminal device to: transmit, to a second terminal device, a configuration for reference signals for sidelink beam management by using at least one of a radio resource control (RRC) signaling or sidelink control information (SCI) ; and transmit, to the second terminal device, at least one of the reference signals based on the configuration.
  • RRC radio resource control
  • SCI sidelink control information
  • a second terminal device comprising a processor.
  • the processor is configured to cause the second terminal device to: receive, from a first terminal device, a configuration for reference signals for sidelink beam management by using at least one of an RRC signaling or SCI; and receive, from the first terminal device, at least one of the reference signals based on the configuration.
  • a method for sidelink communications comprises: transmitting, from a first terminal device to a second terminal device, a configuration for reference signals for sidelink beam management by using at least one of an RRC signaling or SCI; and transmitting, to the second terminal device, at least one of the reference signals based on the configuration.
  • a method for sidelink communications comprises: receiving, at a second terminal device from a first terminal device, a configuration for reference signals for sidelink beam management by using at least one of an RRC signaling or SCI; and receiving, from the first terminal device, at least one of the reference signals based on the configuration.
  • 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 third or the fourth aspect.
  • Fig. 1 illustrates an example communication network in which embodiments of the present disclosure can be implemented
  • Fig. 2 illustrates an example of Channel State Information -Reference Signal (CSI-RS) transmissions
  • Fig. 3 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure
  • Figs. 4A, 4B, 4C, 4D and 4E illustrate an example of resources for CSI-RSs in accordance with some embodiments of the present disclosure, respectively;
  • Fig. 5 illustrates an example of a time domain location in a slot for a CSI-RS in accordance with some embodiments of the present disclosure
  • Fig. 6 illustrates an example of a frequency domain location in a slot for PSSCH and CSI-RS in accordance with some embodiments of the present disclosure
  • Figs. 7A, 7B and 7C illustrate an example of multiplexing between PSSCH and CSI-RS in accordance with some embodiments of the present disclosure, respectively;
  • Figs. 8A and 8B illustrate an example of beam usage for PSCCH, PSSCH and CSI-RS in accordance with some embodiments of the present disclosure, respectively;
  • Fig. 9 illustrates an example of dedicated resources for CSI-RSs in accordance with some embodiments of the present disclosure
  • Fig. 10 illustrates an example of multiplexing between PSSCH and CSI-RS in accordance with some embodiments of the present disclosure
  • Fig. 11 illustrates an example of a structure of a slot in the dedicated resource pool for CSI-RSs in accordance with some embodiments of the present disclosure
  • Fig. 12 illustrates an example of SCI locations in a slot in accordance with some embodiments of the present disclosure
  • Fig. 13 illustrates an example of beam usage for SCI and CSI-RS in accordance with some embodiments of the present disclosure
  • Fig. 14 illustrates a flowchart of an example method in accordance with other embodiments of the present disclosure.
  • Fig. 15 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. Frequency Range 1 (FR1) (410 MHz –7125 MHz) , FR2 (24.25GHz to 52.6GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed/unlicensed/shared spectrum.
  • FR1 Frequency Range 1
  • FR2 24.25GHz to 52.6GHz
  • THz Tera Hertz
  • 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 term ‘includes’a nd 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 ‘another embodiment’ is to be read as ‘at least one other embodiment. ’
  • the terms ‘first, ’ ‘second, ’a nd 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 first terminal device 110, a second terminal device 120, a third terminal device 130, network devices 140 and 150.
  • the network devices 140 and 150 may communicate with the first terminal device 110, the second terminal device 120 and the third 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 first terminal device 110, the second terminal device 120 and the third 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 first terminal device 110) to a destination terminal device (such as the second 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, and terminal device selects sidelink resources by itself to perform sidelink signal transmission, named as mode 2 resource scheme in NR sidelink.
  • Fig. 2 illustrates an example of CSI-RS transmissions.
  • one slot has one symbol for CSI-RS.
  • Each CSI-RS is associated with an SL CSI report window.
  • CSI-RS #1 is associated with an SL CSI report window #1
  • CSI-RS #2 is associated with an SL CSI report window #2
  • CSI-RS #n is associated with an SL CSI report window #n.
  • a terminal device can only transmit one CSI-RS in one slot by using one beam.
  • the terminal device cannot transmit the CSI-RS#2 until the terminal device receives an SL CSI report associated with the CSI-RS#1 or until the end of the SL CSI report window #1. This will cause very large time latency for sidelink beam management.
  • a first terminal device transmits, to a second terminal device, a configuration for reference signals for sidelink beam management by using at least one of an RRC signaling or SCI.
  • the first terminal device transmits, to the second terminal device, at least one of the reference signals based on the configuration.
  • the first terminal device may transmit multiple reference signals for sidelink beam management in one slot. Thus, time latency for sidelink beam management may be reduced.
  • Fig. 3 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • the method 300 can be implemented at a communication device, such as one of the first terminal device 110, the second terminal device 120 and the third terminal device 130 as shown in Fig. 1.
  • a communication device such as one of the first terminal device 110, the second terminal device 120 and the third terminal device 130 as shown in Fig. 1.
  • the method 300 will be described with reference to Fig. 1 as performed by the first terminal device 110 without loss of generality.
  • the first terminal device 110 transmits, to the second terminal device 120, a configuration for reference signals for sidelink beam management by using at least one of an RRC signaling or SCI.
  • the first terminal device 110 transmits, to the second terminal device 120, at least one of the reference signals based on the configuration.
  • the first terminal device 110 may transmit multiple reference signals for sidelink beam management in one slot by using multiple beams.
  • time latency for sidelink beam management may be reduced.
  • CSI-RSs as an example of the reference signals for sidelink beam management.
  • other type of reference signals will be used for sidelink beam management.
  • the scope of the present disclosure is not limited in this regard.
  • resources for the reference signals may be time-division multiplexed (TDMed) with resources for sidelink data.
  • CSI-RS transmissions are accompanied by sidelink data (SL MAC SDU) transmissions in the same slot.
  • SL MAC SDU sidelink data
  • Such CSI-RS transmissions are also referred to as non-standalone CSI-RS transmissions. This will be described with reference to Figs. 4A, 4B, 4C, 4D and 4E.
  • Figs. 4A, 4B, 4C, 4D and 4E illustrate an example of resources for CSI-RSs in accordance with some embodiments of the present disclosure, respectively.
  • resources for CSI-RSs are also referred to as CSI-RS resources.
  • CSI-RS resources in time domain may comprise CSI-RS symbols.
  • CSI-RS resources in a slot comprise one set of contiguous CSI-RS symbols which are located immediately before a guard symbol in the slot.
  • the slot here means the contiguous symbols used for SL configured by RRC parameters sl-startsymbol and sl-lengthsymbol, where sl-startsymol and sl-lengthsymbol are existing RRC parameters indicating the starting symbol and symbol length of a sidelink slots in a resource pool, respectively.
  • Fig. 4D and 4E may be considered as an implementation of the example of Fig. 4A.
  • the slot is configured with PSFCH symbols.
  • the one set of contiguous CSI-RS symbols are located immediately before a guard symbol 410 at an end of the slot.
  • the one set of contiguous CSI-RS symbols are located immediately before a guard symbol 420 which is located before PSFCH symbols 430.
  • no CSI-RS resources for beam management may be configured, allowed or enabled.
  • the first terminal device 110 may transmit no reference signals for sidelink beam management in a slot comprising PSFCH symbols.
  • CSI-RS resources in a slot comprise two sets of contiguous CSI-RS symbols which are located before a guard symbol in the slot. There are PSSCH resources between the two sets of contiguous CSI-RS symbols.
  • CSI-RS resources in a slot comprise one set of contiguous CSI-RS symbols which are located between PSSCH resources.
  • only the RRC signaling is used to transmit the configuration for reference signals. In this way, it is easy for determination of a transmission block size (TBS) associated with sidelink data in a slot and rate match in the CSI-RS region.
  • TBS transmission block size
  • the configuration for reference signals may comprise an identity (ID) for each of the reference signals.
  • ID an ID for a CSI-RS is also referred to as CSI-RS ID (CRI) .
  • the configuration for reference signals may comprise allocation information about resources for the reference signals.
  • the allocation information may comprise at least one of the following for each of the reference signals: a frequency domain location in a resource block (RB) , or a time domain location in a slot.
  • a frequency domain location in an RB may comprise a resource element (RE) location in the RB
  • the time domain location in a slot may comprise a symbol location in the slot.
  • RE resource element
  • the allocation information may comprise a first offset between the time domain location and a guard symbol in the slot.
  • the first offset indicates the time domain location for each of the reference signals.
  • the allocation information may comprise a second offset between the time domain location and a second time domain location for the SCI in the slot.
  • the second offset indicates the time domain location for each of the reference signals. This will be described with reference to Fig. 5.
  • Fig. 5 illustrates an example of a time domain location in a slot for a CSI-RS in accordance with some embodiments of the present disclosure.
  • a slot comprises an AGC symbol, symbols for PSCCH carrying SCI, symbols for PSSCH carrying sidelink data, three symbols for CSI-RSs and a guard symbol.
  • a first offset between a symbol for an CSI-RS and the guard symbol in the slot may be represented by L.
  • a second offset between a symbol for an CSI-RS and an ending symbol for the SCI in PSCCH in the slot may be represented by M.
  • the second terminal device 120 may measure the CSI-RSs when receiving SCI trigger in the PSCCH in the same slot.
  • the configuration for reference signals may not comprise an ID for each of the reference signals.
  • the configuration for reference signals may not comprise explicit CRI for each CSI-RS.
  • a time domain location for each of the reference signals in a slot indicates an ID for a respective one of the reference signals.
  • a first offset between a symbol for an CSI-RS and the guard symbol in the slot may be represented by L.
  • the first terminal device 110 may determine a transmission block size (TBS) associated with sidelink data in a slot based on the number of REs used for a first subset of the reference signals in the slot. For example, if density is equal to 1, the number of REs in an RB in a slot for CSI-RS is equal to 1.
  • TBS transmission block size
  • the RRC signaling and SCI are used to transmit the configuration for reference signals. Compared with the embodiments where only the RRC signaling is used to transmit the configuration for reference signals, such embodiments are more flexibility and have shorter latency and less RRC reconfigurations, considering frequent beam training in sidelink.
  • the RRC signaling may indicate CRI for each CSI-RS.
  • the RRC signaling may indicate the allocation information about resources for the reference signals.
  • the allocation information may comprise at least one of the following for each of the reference signals: a frequency domain location in an RB, or a time domain location in a slot.
  • the frequency domain location in an RB may comprise an RE location in the RB
  • the time domain location in a slot may comprise a symbol location in the slot.
  • the allocation information may comprise a first offset between the time domain location and a guard symbol in the slot.
  • the first offset indicates the time domain location for each of the reference signals.
  • the allocation information may comprise a second offset between the time domain location and a second time domain location for the SCI in the slot. The second offset indicates the time domain location for each of the reference signals.
  • the first terminal device 110 may transmit the SCI in a first slot.
  • the SCI indicates at least one of the following: a first subset of the reference signals to be transmitted in the first slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the first slot.
  • the first terminal device 110 may determine a TBS associated with sidelink data in the slot based on a configured or pre-configured symbol number in the slot used for the first subset of the reference signals. For example, in the example of Fig. 5, the configured or pre-configured symbol number in the slot may be equal to three.
  • the first terminal device 110 may determine a TBS associated with sidelink data in the slot based on a configured or pre-configured parameter indicating an overhead of the reference signals or an average number of REs for the reference signals.
  • the first terminal device 110 may determine a TBS associated with sidelink data in the slot based on the number of REs used for a first subset of the reference signals in the slot. For example, if density is equal to 1, the number of REs in an RB in a slot for CSI-RS is equal to 1.
  • CSI-RS transmissions within a slot for sidelink beam management should be confined within the associated PSSCH in the same slot, for example, the same sub-channel/RB/frequency range/frequency domain reference resource with the associated PSSCH in the same slot. In this way, simple mapping between the unicast pair (source UE and destination UE) and associated CSI-RS may be achieved. This will be described with reference to Fig. 6.
  • Fig. 6 illustrates an example of a frequency domain location in a slot for PSSCH and CSI-RS in accordance with some embodiments of the present disclosure.
  • sidelink beam training will be performed in frequency ranges #1 and 2 and no sidelink beam training will be performed in frequency range #3.
  • CSI-RS transmissions within a slot for sidelink beam management are confined within the associated PSSCH #1 in frequency range #1 and the associated PSSCH #2 in frequency range #2 in the same slot.
  • Figs. 7A, 7B and 7C illustrate an example of multiplexing between PSSCH and CSI-RS in accordance with some embodiments of the present disclosure, respectively.
  • the first terminal device 110 may transmit CSI-RSs in three symbols in a slot and the CSI-RSs are FDMed with PSSCH in the three symbols in the slot.
  • the first terminal device 110 may transmit the CSI-RSs in three symbols by using a single energy per resource element (EPRE) for the CSI-RSs and PSSCH in three symbols.
  • EPRE energy per resource element
  • the first terminal device 110 may transmit CSI-RSs in three symbols in a slot and the CSI-RSs are not FDMed with PSSCH in the three symbols in the slot.
  • the first terminal device 110 may transmit the CSI-RSs in three symbols by boosting a transmit power of EPRE for the CSI-RSs to supplement the transmit power in CSI-RS symbols to the PSSCH symbols. In this way, no AGC symbol is needed before CSI-RS. Otherwise, AGC symbol should be inserted across the entire resource pool before possible CSI-RS symbols.
  • the first terminal device 110 may transmit, to the second terminal device, sidelink data or the SCI in a first slot by using a first type of beam and transmit a first subset of the reference signals in the first slot by using a second type of beam.
  • the first type of beam is different from the second type of beam.
  • a first type of beam is also referred to as “beam type A”
  • a second type of beam is also referred to as “beam type B” . This will be described with reference to Fig. 8A.
  • Fig. 8A illustrates an example of beam usage for PSCCH, PSSCH and CSI-RS in accordance with some embodiments of the present disclosure.
  • the first terminal device 110 transmits PSCCH or PSSCH in a slot by using beam type A and transmits CSI-RS in the slot by using beam type B.
  • a first width of the first type of beam has wider coverage than a second width of the second type of beam.
  • the first type of beam may be initial or coarse TX beam after initial beam pairing (e.g., Procedure 1 (P1) : TRP beam sweeping and UE beam sweeping) or omni-directional TX beam.
  • the second type of beam may be narrow or refined beam for beam refinement (e.g., Procedure 2 (P2) : TRP beam sweeping only or procedure 3 (P3) : UE beam sweeping only) .
  • the first terminal device 110 may transmit the CSI-RSs by switching the first type of beam to the second type of beam at an initial symbol location, i.e., the symbol location for the CSI-RSs in the slot.
  • the first terminal device 110 may transmit the CSI-RSs by different beams of the second type that need training. For example, as shown in Fig. 8A, the first terminal device 110 may transmit the CSI-RSs by using beams B1, B2 and B3 that need training.
  • the first terminal device 110 may transmit, to the second terminal device, sidelink data or the SCI in a first slot by using a second type of beam and transmit a first subset of the reference signals in the first slot by using the second type of beam. This will be described with reference to Fig. 8B.
  • Fig. 8B illustrates an example of beam usage for PSCCH, PSSCH and CSI-RS in accordance with some embodiments of the present disclosure.
  • the first terminal device 110 transmits PSCCH or PSSCH in a slot by using beam type B and transmits CSI-RS in the slot by using beam type B.
  • the first terminal device 110 may use a first beam of the second type for transmission of PSCCH or PSSCH and an initial transmission (i.e., the first transmission) of the CSI-RS in the slot.
  • the first terminal device 110 may transmit the CSI-RSs by using beams B1, B2 and B3 that need training. Directions of beams B1, B2 and B3 are different from each other.
  • the first terminal device 110 may transmit PSCCH or PSSCH by using the beam B1 which is the same as the beam used for the first transmission of the CSI-RS in the slot. In this way, the number of beam switching may be saved.
  • the first terminal device 110 may transmit PSCCH or PSSCH by using the beam Bx.
  • the first terminal device 110 may determine Bx to be one of beams B1, B2 and B3 based on some prior information.
  • resources for the reference signals may comprise dedicated resources in a sidelink resource pool, and each of the dedicated resources is associated with a sidelink slot in the sidelink resource pool. This will be described with reference to Fig. 9.
  • Fig. 9 illustrates an example of dedicated resources for CSI-RSs in accordance with some embodiments of the present disclosure.
  • dedicated resources for CSI-RSs are also referred to as dedicated CSI-RS resources.
  • dedicated CSI-RS resources in time domain may comprise dedicated CSI-RS symbols.
  • a CSI-RS region in a sidelink resource pool is associated with a legacy sidelink slot in the sidelink resource pool.
  • the CSI-RS region is a subset of the dedicated CSI-RS resources.
  • a CSI-RS region is also referred to as a subset of the dedicated CSI-RS resources.
  • a CSI-RS region comprises three dedicated CSI-RS symbols and a guard symbol.
  • the dedicated CSI-RS symbols will be empty and no transmission is assumed.
  • the first terminal device 110 may determine the dedicated resources based on a configuration or pre-configuration by higher layer.
  • the dedicated resources may be configured or pre-configured per sidelink resource pool.
  • the configuration or pre-configuration comprises a first bandwidth of the dedicated resources.
  • the first bandwidth of the dedicated resources equals to a second bandwidth of the resource pool by default.
  • the configuration or pre-configuration comprises a first starting symbol and a first symbol length of the dedicated resources.
  • the configuration or pre-configuration comprises a first symbol length of the dedicated resources.
  • the first terminal device 110 may determine a first starting symbol of the dedicated resources based on a second starting symbol and a second symbol length of sidelink slots in the sidelink resource pool. For example, the first terminal device 110 may determine the dedicated resources starts from [sl-startsymol+sl-lengthsymbol+1] , where sl-startsymol and l-lengthsymbol are existing RRC parameters indicating the second starting symbol and the second symbol length of sidelink slots in the sidelink resource pool.
  • a CSI-RS region in a sidelink resource pool may be comprised in a legacy sidelink slot in the sidelink resource pool, which is not shown. Otherwise, slots containing dedicated CSI-RS resource are configured or pre-configured per resource pool, for example, by bitmap or by indicating periodicity among the slots
  • only the RRC signaling is used to transmit the configuration for reference signals.
  • the configuration for reference signals may comprise an ID for each of the reference signals.
  • the configuration for reference signals may comprise CRI for each CSI-RS.
  • the configuration for reference signals may comprise allocation information about resources for the reference signals.
  • the allocation information may comprise at least one of the following for each of the reference signals: a frequency domain location in an RB, or a time domain location in a CSI-RS region.
  • the frequency domain location in an RB may comprise an RE location in the RB
  • the time domain location in the CSI-RS region may comprise a symbol location in the CSI-RS region. This will be described with reference to Fig. 9.
  • a slot comprises an AGC symbol, symbols for PSCCH carrying SCI, symbols for PSSCH carrying sidelink data, and a CSI-RS region.
  • the CSI-RS region may comprise three CSI-RS symbols and a guard symbol.
  • the configuration for reference signals may not comprise an ID for each of the reference signals.
  • the configuration for reference signals may not comprise explicit CRI for each CSI-RS.
  • a time domain location for each of the reference signals in the CSI-RS region indicates an ID for a respective one of the reference signals.
  • the second terminal device 120 may measure the CSI-RSs when receiving SCI trigger in the PSCCH in the same slot.
  • the RRC signaling and SCI are used to transmit the configuration for reference signals. Compared with the embodiments where only the RRC signaling is used to transmit the configuration for reference signals, such embodiments are more flexibility and have shorter latency and less RRC reconfigurations, considering frequent beam training in sidelink.
  • the RRC signaling may indicate CRI for each CSI-RS.
  • the RRC signaling may indicate the allocation information about resources for the reference signals.
  • the allocation information may comprise at least one of the following for each of the reference signals: a frequency domain location in an RB, or a time domain location in a CSI-RS region.
  • the frequency domain location in an RB may comprise an RE location in the RB
  • the time domain location in the CSI-RS region may comprise a symbol location in the CSI-RS region, as described with reference to Fig. 9.
  • the configuration for reference signals may not comprise an ID for each of the reference signals.
  • the configuration for reference signals may not comprise explicit CRI for each CSI-RS.
  • a time domain location for each of the reference signals in the CSI-RS region indicates an ID for a respective one of the reference signals.
  • the first terminal device 110 may transmit the SCI in a first slot.
  • the SCI indicates at least one of the following: a first subset of the reference signals to be transmitted in the first slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the first slot.
  • legacy TBS determination procedure defined in Release 16 may be reused.
  • CSI-RS transmissions within a slot for sidelink beam management should be confined within the associated PSSCH in the same slot, for example, the same sub-channel/RB/frequency range/frequency domain reference resource with the associated PSSCH in the same slot. In this way, simple mapping between the unicast pair (source UE and destination UE) and associated CSI-RS may be achieved. This will be described with reference to Fig. 9.
  • sidelink beam training will be performed in frequency ranges #1 and 2.
  • CSI-RS transmissions within a slot for sidelink beam management are confined within the associated PSSCH in frequency range #1 and the associated PSSCH in frequency range #2 in the same slot.
  • Fig. 10 illustrates an example of multiplexing between PSSCH and CSI-RS in accordance with some embodiments of the present disclosure.
  • the first terminal device 110 may determine an initial symbol in a subset of the dedicated resources to be an AGC symbol. For example, the first terminal device 110 may determine an initial symbol in a CSI-RS region to be an AGC symbol because the CSI-RSs may be absent and no transmission exists. Alternatively, the first terminal device 110 may determine a symbol before an initial transmission (i.e., the first transmission) of CSI-RSs in a CSI-RS region to be an AGC symbol. In some embodiments, a signal at the AGC symbol may be a repetition of a signal at the next symbol.
  • the first terminal device 110 may transmit sidelink data or SCI in a first slot by using the first type of beam (i.e., the beam type A) and transmit a first subset of the reference signals and an AGC signal in the first slot by using the second type of beam (i.e., the beam type B) .
  • the beam type A is different from the beam type B. This will be described with reference to Fig. 10.
  • the first terminal device 110 transmits PSCCH or PSSCH in a slot by using beam type A and transmits CSI-RS and AGC signal in the slot by using beam type B.
  • a first width of the first type of beam has wider coverage than a second width of the second type of beam.
  • the first type of beam may be initial or coarse TX beam after initial beam pairing (e.g., P1 procedure) or omni-directional TX beam.
  • the second type of beam may be narrow or refined beam for beam refinement (e.g., P2 or P3 procedure) .
  • the first terminal device 110 may transmit the CSI-RSs by switching the first type of beam to the second type of beam at the AGC symbol in the CSI-RS region.
  • the first terminal device 110 may transmit the CSI-RSs by different beams of the second type that need training. For example, the first terminal device 110 may transmit the CSI-RSs by using beams B1, B2 and B3 that need training.
  • the first terminal device 110 may transmit sidelink data or the SCI in a first slot by using a second type of beam and transmit a first subset of the reference signals and AGC signal in the first slot by using the second type of beam.
  • the first terminal device 110 may use a first beam of the second type for transmission of PSCCH or PSSCH and an initial transmission (i.e., the first transmission) of the CSI-RS in the slot.
  • the first terminal device 110 may transmit the CSI-RSs by using beams B1, B2 and B3 that need training. Directions of beams B1, B2 and B3 are different from each other.
  • the first terminal device 110 may transmit the AGC signal by using the beam B1 which is the same as the beam used for the first transmission of the CSI-RS in the CSI-RS region.
  • the first terminal device 110 may transmit PSCCH or PSSCH by using the beam B1. In this way, the number of beam switching may be saved.
  • the first terminal device 110 may transmit PSCCH or PSSCH by using the beam Bx.
  • the first terminal device 110 may determine Bx to be one of beams B1, B2 and B3 based on some prior information.
  • the resources for the reference signals are comprised in a dedicated resource pool for the reference signals.
  • CSI-RS transmissions on the resources are also referred to as standalone CSI-RS transmissions.
  • Fig. 11 illustrates an example of a structure of a slot in the dedicated resource pool for CSI-RSs in accordance with some embodiments of the present disclosure. As shown in Fig. 11, all the symbols in a slot (except that the first symbol is used as an AGC symbol and the last symbol is used as a guard symbol) may be used for CSI-RS.
  • one slot may be dedicated for one TX UE to transmit CSI-RSs to one or more RX UE (s) .
  • the slot as shown in Fig. 11 may be dedicated for the first terminal device 110 to transmit CSI-RSs to one or more of the second terminal device 120 and the third terminal device 130.
  • the dedicated resource pool is configured or pre-configured for CSI-RS transmission only.
  • the resource allocation procedure for a sidelink resource pool as defined in clause 8 of TS 38.214 may be reused.
  • bitmap based resource allocation may be used for the dedicated resource pool.
  • the dedicated resource pool and a sidelink resource pool are configured with a single bandwidth part (i.e., the same bandwidth part) .
  • the dedicated resource pool may be TDMed with the sidelink resource pool.
  • the RRC signaling and SCI are used to transmit the configuration for reference signals.
  • the RRC signaling may indicate CRI for each CSI-RS.
  • the RRC signaling may indicate the allocation information about resources for the reference signals.
  • the allocation information may comprise at least one of the following for each of the reference signals: a frequency domain location in an RB, or a time domain location in a slot.
  • the frequency domain location in an RB may comprise an RE location in the RB
  • the time domain location in the slot may comprise a symbol location in the slot. This will be described with reference to Fig. 11.
  • a slot comprises an AGC symbol, symbols for CSI-RSs and a guard symbol.
  • the SCI indicates at least one of the following: at least one first subset of the reference signals to be transmitted in a first slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the first slot.
  • the RRC signaling indicates a frequency domain location in a resource block for each of the reference signals.
  • the SCI indicates at least one of the following: a time domain location in a slot for each of the reference signals, at least one first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling or the SCI further indicates at least one reserved sub-channels comprising RBs for the reference signals.
  • Fig. 12 illustrates an example of SCI locations in a slot in accordance with some embodiments of the present disclosure.
  • a first subset of CSI-RSs is to be transmitted from the first terminal device 110 to the second terminal device 120 in symbols #2, #3 and #4 in a slot
  • a second subset of CSI-RSs is to be transmitted from the first terminal device 110 to the third terminal device 130 in symbols #10, #11 and #12 in the slot.
  • First SCI is associated with a first unicast link between the first terminal device 110 and the second terminal device 120.
  • the first terminal device 110 transmits the first SCI in symbol #1 before the first subset of CSI-RSs.
  • Second SCI is associated with a second unicast link between the first terminal device 110 and the third terminal device 130.
  • the first terminal device 110 transmits the second SCI in symbol #10 before the second subset of CSI-RSs.
  • the first SCI may indicate at least one of the following: a first source ID of the first unicast link, a first destination ID of the first unicast link, the first subset of CSI-RSs to be transmitted to the second terminal device 120 in symbols #2, #3 and #4 in the slot, at least one third subset of the reference signals to be transmitted to the second terminal device 120 in at least one reserved slot subsequent to the slot, or at least one reserved sub-channels comprising RBs for CSI-RSs.
  • the first SCI may also indicate a time domain location within the slot for the second SCI.
  • the time domain location within the slot for the second SCI may be pre-configured by the RRC signaling.
  • the second SCI may indicate at least one of the following: a second source ID of the second unicast link, a second destination ID of the second unicast link, the second subset of CSI-RSs to be transmitted to the third terminal device 130 in symbols #10, #11 and #12 in the slot, at least one fourth subset of the reference signals to be transmitted to the third terminal device 130 in at least one reserved slot subsequent to the slot, or at least one reserved sub-channels comprising RBs for CSI-RSs.
  • the second source ID of the second unicast link is the same as the first source ID of the first unicast link.
  • the first terminal device 110 may not transmit the second SCI but transmit the first SCI only.
  • the first SCI may further indicate at least one of the following: the second destination ID of the second unicast link, the second subset of CSI-RSs to be transmitted to the third terminal device 130 in symbols #10, #11 and #12 in the slot, at least one fourth subset of the reference signals to be transmitted to the third terminal device 130 in at least one reserved slot subsequent to the slot, or at least one reserved sub-channels comprising RBs for CSI-RSs.
  • the first terminal device 110 preferably use the symbols within a slot from the first symbol.
  • the second terminal device 120 or the third terminal device 130 when the second terminal device 120 or the third terminal device 130 detects reservations in any symbol of one slot, the second terminal device 120 or the third terminal device 130 should assume the slot is not available.
  • sub-channel/RB/frequency range/frequency domain reference resource of CSI-RS transmissions within a slot for sidelink beam management may be indicated in the RRC signaling or SCI as described above.
  • the first terminal device 110 may transmit the SCI in a slot by using the first type of beam (i.e., the beam type A) and transmit at least one of a first subset of the reference signals and a second subset of the reference signals in the slot by using the second type of beam (i.e., the beam type B) .
  • the beam type A is different from the beam type B.
  • the first terminal device 110 transmits SCI in a slot by using beam type A and transmits a first subset of CSI-RSs and a second subset of CSI-RSs in the slot by using beam type B.
  • a first width of the first type of beam has wider coverage than a second width of the second type of beam.
  • the first type of beam may be initial or coarse TX beam after initial beam pairing (e.g., P1 procedure) or omni-directional TX beam.
  • the second type of beam may be narrow or refined beam for beam refinement (e.g., P2 or P3 procedure) .
  • the first terminal device 110 may transmit the CSI-RSs by switching the first type of beam to the second type of beam at the first symbol of the CSI-RS transmission.
  • the first terminal device 110 may transmit the CSI-RSs by different beams of the second type.
  • the first terminal device 110 may transmit the CSI-RSs by using beams B1, B2 and B3.
  • the first terminal device 110 may transmit the SCI in a slot by using a second type of beam and transmit the CSI-RSs in the slot by using the second type of beam. This will be described with reference to Fig. 13.
  • Fig. 13 illustrates an example of beam usage for SCI and CSI-RS in accordance with some embodiments of the present disclosure.
  • the first terminal device 110 may use a first beam of the second type for transmission of the first SCI in symbol #1 and an initial transmission (i.e., the first transmission) of the CSI-RS in the first subset in the slot.
  • the first terminal device 110 may transmit the CSI-RSs in the first subset by using beams B1, B2 and B3 that need training.
  • Directions of beams B1, B2 and B3 are different from each other.
  • the first terminal device 110 may transmit the first SCI in symbol #1 by using the beam B1 which is the same as the beam used for the first transmission of the CSI-RS in the first subset. In this way, the number of beam switching may be saved.
  • the first terminal device 110 may transmit the first SCI by using the beam Bx.
  • the first terminal device 110 may determine Bx to be one of beams B1, B2 and B3 based on some prior information.
  • the first terminal device 110 may use a first beam of the second type for transmission of the second SCI in symbol #10 and an initial transmission (i.e., the first transmission) of the CSI-RS in the second subset in the slot. For example, the first terminal device 110 may transmit the CSI-RSs in the second subset by using beams B1 and B2 that need training. Directions of beams B1 and B2 are different from each other. The first terminal device 110 may transmit the second SCI in symbol #10 by using the beam B1 which is the same as the beam used for the first transmission of the CSI-RS in the second subset. In this way, the number of beam switching may be saved.
  • the first terminal device 110 may transmit the second SCI by using the beam Bx.
  • the first terminal device 110 may determine Bx to be one of beams B1 and B2 based on some prior information.
  • a TX UE (such as the first terminal device 110) needs to use more than one slot to finish the beam pairing training. In such embodiments, there may be one measurement report after each slot. Alternatively, there may be only one measurement report after multiple slots.
  • Fig. 14 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • the method 1400 can be implemented at a communication device, such as one of the first terminal device 110, the second terminal device 120 and the third terminal device 130 as shown in Fig. 1.
  • the method 1400 will be described with reference to Fig. 1 as performed by the second terminal device 120 without loss of generality.
  • the second terminal device 120 receives, from the first terminal device 110, a configuration for reference signals for sidelink beam management by using at least one of an RRC signaling or SCI.
  • the second terminal device 120 receives, from the first terminal device 110, at least one of the reference signals based on the configuration.
  • the resources for the reference signals comprise a first subset of symbols in a slot for a first subset of the reference signals, the first subset of symbols being located before a guard symbol in the slot.
  • the guard symbol is located at an end of the slot or before symbols in the slot for physical sidelink feedback channel.
  • the second terminal device 120 receives no reference signals for sidelink beam management in a slot comprising symbols for physical sidelink feedback channel.
  • the configuration comprises allocation information about resources for the reference signals.
  • a time domain location for each of the reference signals in a slot indicates an identity for a respective one of the reference signals.
  • the allocation information comprises one of the following: a first offset between the time domain location and a guard symbol in the slot, the first offset indicating the time domain location for each of the reference signals, or a second offset between the time domain location and a second time domain location for the SCI in the slot, the second offset indicating the time domain location for each of the reference signals.
  • receiving the allocation information comprises: receiving the allocation information by using the RRC signaling; and the method 1400 further comprises receiving the SCI in a slot.
  • the SCI indicates at least one of the following: a first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • receiving the at least one of the reference signals comprises: receiving a first subset of the reference signals in symbols in a slot, the first subset of the reference signals being frequency-division multiplexed with sidelink data in the symbols in the slot.
  • receiving the first subset of the reference signals comprises: receiving the first subset of the reference signals by using a single energy per resource element (EPRE) for the first subset of the reference signals and the sidelink data.
  • EPRE energy per resource element
  • receiving the at least one of the reference signals comprises: receiving a first subset of the reference signals in a slot, the first subset of the reference signals being not frequency-division multiplexed with sidelink data in a same symbol in the slot.
  • a first transmit power of energy per resource element (EPRE) for the first subset of the reference signals is equal to a second transmit power of EPRE for the sidelink data.
  • EPRE energy per resource element
  • the method 1400 further comprises receiving, from the first terminal device, sidelink data or the SCI in a slot by using a first type of beam; and receiving the at least one of the reference signals comprises: receiving a first subset of the reference signals in the slot by using a second type of beam.
  • the resources for the reference signals comprise dedicated resources in a sidelink resource pool, and a subset of the dedicated resources is associated with a sidelink slot in the sidelink resource pool.
  • the method 1400 further comprises: determining the dedicated resources based on a configuration or pre-configuration by higher layer.
  • the configuration or pre-configuration comprises a first bandwidth of the dedicated resources.
  • the configuration or pre-configuration comprises a first starting symbol and a first symbol length of the dedicated resources.
  • the configuration or pre-configuration comprises a first symbol length of the dedicated resources; and the method 1400 further comprises determining a first starting symbol of the dedicated resources based on a second starting symbol and a second symbol length of sidelink slots in the sidelink resource pool.
  • the allocation information comprises at least one of the following for each of the reference signals: a resource element location in a resource block, or a symbol location in the subset of the dedicated resources.
  • the method 1400 further comprises determining an initial symbol in the subset of the dedicated resources to be an automatic gain control (AGC) symbol.
  • AGC automatic gain control
  • the method 1400 further comprises receiving, from the first terminal device, sidelink data or the SCI by using a first type of beam; andreceiving the at least one of the reference signals comprises: receiving a first subset of the reference signals and an AGC signal by using a second type of beam.
  • the resources for the reference signals are comprised in a dedicated resource pool for the reference signals.
  • the dedicated resource pool and a sidelink resource pool are configured with a single bandwidth part.
  • the RRC signaling indicates the allocation information
  • the SCI indicates at least one of the following: at least one first subset of the reference signals to be transmitted in a slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling indicates a frequency domain location in a resource block for each of the reference signals; and the SCI indicates at least one of the following: a time domain location in a slot for each of the reference signals, at least one first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling or the SCI further indicates at least one reserved sub-channels for the reference signals.
  • the SCI comprises first SCI associated with a first unicast link between the first terminal device and the second terminal device 120, the first SCI indicating at least one of the following: a first source identity of the first unicast link, a first destination identity of the first unicast link, a first subset of the reference signals to be transmitted to the second terminal device 120 in a slot, or at least one second subset of the reference signals to be transmitted to the second terminal device 120 in at least one reserved slot subsequent to the slot.
  • the SCI further comprises second SCI associated with a second unicast link between the first terminal device and the third terminal device, the second SCI indicating at least one of the following: a second source identity of the second unicast link, a second destination identity of the second unicast link, a third subset of the reference signals to be transmitted to the third terminal device in the slot, or at least one fourth subset of the reference signals to be transmitted to the third terminal device in at least one reserved slot subsequent to the slot.
  • the first SCI further indicates at least one of the following: a second destination identity of the second unicast link, a third subset of the reference signals to be transmitted to the third terminal device in the slot, or at least one fourth subset of the reference signals to be transmitted to the third terminal device in at least one reserved slot subsequent to the slot.
  • the first SCI further indicates a time domain location within the slot for the second SCI.
  • the method 1400 further comprises receiving the SCI by using a first type of beam; and receiving the at least one of the reference signals comprises receiving a first subset of the reference signals by using a second type of beam.
  • the first type of beam is different from the second type of beam.
  • a first width of the first type of beam has wider coverage than a second width of the second type of beam.
  • receiving the first subset of the reference signals comprises switching the first type of beam to the second type of beam at an initial symbol location for the first subset of the reference signals.
  • the first type of beam is the same as the second type of beam.
  • the method 1400 further comprises receiving the SCI and an initial transmission of the first subset of the reference signals by using a first beam of the second type.
  • the method 1400 further comprises: receiving the SCI by using a first beam of the second type; and receiving the first subset of the reference signals by using a set of beams of the second type, the first beam being comprised in the set of beams.
  • the method 1400 further comprises determining a transmission block size associated with sidelink data in a slot based on at least one of the following: the number of resource elements (REs) used for a first subset of the reference signals in the slot, a configured or pre-configured symbol number in the slot used for the first subset of the reference signals, or an average number of REs for the reference signals.
  • REs resource elements
  • Fig. 15 is a simplified block diagram of a device 1500 that is suitable for implementing embodiments of the present disclosure.
  • the device 1500 can be considered as a further example embodiment of the first terminal device 110 or the second terminal device 120 as shown in Fig. 1. Accordingly, the device 1500 can be implemented at or as at least a part of the first terminal device 110 or the second terminal device 120.
  • the device 1500 includes a processor 1510, a memory 1520 coupled to the processor 1510, a suitable transceiver 1540 coupled to the processor 1510, and a communication interface coupled to the transceiver 1540.
  • the memory 1510 stores at least a part of a program 1530.
  • the transceiver 1540 may be for bidirectional communications or a unidirectional communication based on requirements.
  • the transceiver 1540 may include at least one of a transmitter 1542 and a receiver 1544.
  • the transmitter 1542 and the receiver 1544 may be functional modules or physical entities.
  • the transceiver1540 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/Xn interface for bidirectional communications between eNBs/gNBs, S1/NG interface for communication between a Mobility Management Entity (MME) /Access and Mobility Management Function (AMF) /SGW/UPF and the eNB/gNB, Un interface for communication between the eNB/gNB and a relay node (RN) , or Uu interface for communication between the eNB/gNB and a terminal device.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • RN relay node
  • Uu interface for communication between the eNB/gNB and a terminal device.
  • embodiments of the present disclosure may provide the following solutions.
  • a first terminal device comprising a processor configured to cause the first terminal device to: transmit, to a second terminal device, a configuration for reference signals for sidelink beam management by using at least one of a radio resource control (RRC) signaling or sidelink control information (SCI) ; and transmit, to the second terminal device, at least one of the reference signals based on the configuration.
  • RRC radio resource control
  • SCI sidelink control information
  • resources for the reference signals comprise a first subset of symbols in a slot for a first subset of the reference signals, the first subset of symbols being located before a guard symbol in the slot.
  • the guard symbol is located at an end of the slot or before symbols for physical sidelink feedback channel in the slot.
  • the first terminal device is caused to transmit no reference signals for sidelink beam management in a slot comprising symbols for physical sidelink feedback channel.
  • the configuration comprises allocation information about resources for the reference signals.
  • a time domain location for each of the reference signals in a slot indicates an identity for a respective one of the reference signals.
  • the allocation information comprises one of the following: a first offset between the time domain location and a guard symbol in a slot, the first offset indicating the time domain location for each of the reference signals, or a second offset between the time domain location and a second time domain location for the SCI in the slot, the second offset indicating the time domain location for each of the reference signals.
  • the first terminal device is caused to transmit the allocation information by using the RRC signaling; and the first terminal device is further caused to transmit the SCI in a slot, the SCI indicating at least one of the following: a first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the first terminal device is caused to transmit the at least one of the reference signals by transmitting a first subset of the reference signals in symbols in a slot, the first subset of the reference signals being frequency-division multiplexed with sidelink data in the symbols in the slot.
  • the first terminal device is caused to transmit the first subset of the reference signals by using a single energy per resource element (EPRE) for the first subset of the reference signals and the sidelink data.
  • EPRE energy per resource element
  • the first terminal device is caused to transmit the at least one of the reference signals by transmitting a first subset of the reference signals in a slot, the first subset of the reference signals being not frequency-division multiplexed with sidelink data in a same symbol in the slot.
  • the first terminal device is caused to transmit the first subset of the reference signals by boosting a transmit power of energy per resource element (EPRE) for the first subset of the reference signals.
  • EPRE energy per resource element
  • the first terminal device is further caused to transmit, to the second terminal device, sidelink data or the SCI in a slot by using a first type of beam;
  • the first terminal device is caused to transmit a first subset of the reference signals in the slot by using a second type of beam.
  • the resources for the reference signals comprise dedicated resources in a sidelink resource pool, and a subset of the dedicated resources is associated with a sidelink slot in the sidelink resource pool.
  • the first terminal device is further caused to determine the dedicated resources based on a configuration or pre-configuration by higher layer.
  • the configuration or pre-configuration comprises a first bandwidth of the dedicated resources.
  • the configuration or pre-configuration comprises a first starting symbol and a first symbol length of the dedicated resources.
  • the configuration or pre-configuration comprises a first symbol length of the dedicated resources; and the first terminal device is caused to determine a first starting symbol of the dedicated resources based on a second starting symbol and a second symbol length of sidelink slots in the sidelink resource pool.
  • the allocation information comprises at least one of the following for each of the reference signals: a resource element location in a resource block, or a symbol location in the subset of the dedicated resources.
  • the first terminal device is further caused to determine an initial symbol in the subset of the dedicated resources to be an automatic gain control (AGC) symbol.
  • AGC automatic gain control
  • the first terminal device is further caused to transmit, to the second terminal device, sidelink data or the SCI by using a first type of beam; and the first terminal device is caused to transmit a first subset of the reference signals and an AGC signal by using a second type of beam.
  • the resources for the reference signals are comprised in a dedicated resource pool for the reference signals.
  • the dedicated resource pool and a sidelink resource pool are configured with a single bandwidth part.
  • the RRC signaling indicates the allocation information
  • the SCI indicates at least one of the following: at least one first subset of the reference signals to be transmitted in a slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling indicates a frequency domain location in a resource block for each of the reference signals; and the SCI indicates at least one of the following: a time domain location in a slot for each of the reference signals, at least one first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling or the SCI further indicates at least one reserved sub-channels for the reference signals.
  • the SCI comprises first SCI associated with a first unicast link between the first terminal device and the second terminal device, the first SCI indicating at least one of the following: a first source identity of the first unicast link, a first destination identity of the first unicast link, a first subset of the reference signals to be transmitted to the second terminal device in a slot, or at least one second subset of the reference signals to be transmitted to the second terminal device in at least one reserved slot subsequent to the slot.
  • the SCI further comprises second SCI associated with a second unicast link between the first terminal device and the third terminal device, the second SCI indicating at least one of the following: a second source identity of the second unicast link, a second destination identity of the second unicast link, a third subset of the reference signals to be transmitted to the third terminal device in the slot, or at least one fourth subset of the reference signals to be transmitted to the third terminal device in at least one reserved slot subsequent to the slot.
  • the first SCI further indicates at least one of the following: a second destination identity of the second unicast link, a third subset of the reference signals to be transmitted to the third terminal device in the slot, or at least one fourth subset of the reference signals to be transmitted to the third terminal device in at least one reserved slot subsequent to the slot.
  • the first SCI further indicates a time domain location within the slot for the second SCI.
  • the first terminal device is further caused to transmit the SCI by using a first type of beam; and the first terminal device is caused to transmit a first subset of the reference signals by using a second type of beam.
  • the first type of beam is different from the second type of beam.
  • a first width of the first type of beam has wider coverage than a second width of the second type of beam.
  • the first terminal device is caused to transmit the first subset of the reference signals by switching the first type of beam to the second type of beam at an initial symbol location for the first subset of the reference signals.
  • the first type of beam is the same as the second type of beam.
  • the first terminal device is caused to transmit the SCI and an initial transmission of the first subset of the reference signals by using a first beam of the second type.
  • the first terminal device is caused to transmit the SCI by using a first beam of the second type; and transmit the first subset of the reference signals by using a set of beams of the second type, the first beam being comprised in the set of beams.
  • the first terminal device is further caused to determine a transmission block size associated with sidelink data in a slot based on at least one of the following: the number of resource elements (REs) used for a first subset of the reference signals in the slot, a configured or pre-configured symbol number in the slot used for the first subset of the reference signals, or an average number of REs for the reference signals.
  • REs resource elements
  • a second terminal device comprising a processor configured to cause the second terminal device to: receive, from a first terminal device, a configuration for reference signals for sidelink beam management by using at least one of a radio resource control (RRC) signaling or sidelink control information (SCI) ; and receive, from the first terminal device, at least one of the reference signals based on the configuration.
  • RRC radio resource control
  • SCI sidelink control information
  • the resources for the reference signals comprise a first subset of symbols in a slot for a first subset of the reference signals, the first subset of symbols being located before a guard symbol in the slot.
  • the guard symbol is located at an end of the slot or before symbols for physical sidelink feedback channel in the slot.
  • the second terminal device is caused to receive no reference signals for sidelink beam management in a slot comprising symbols for physical sidelink feedback channel.
  • the configuration comprises allocation information about resources for the reference signals.
  • a time domain location for each of the reference signals in a slot indicates an identity for a respective one of the reference signals.
  • the allocation information comprises one of the following: a first offset between the time domain location and a guard symbol in a slot, the first offset indicating the time domain location for each of the reference signals, or a second offset between the time domain location and a second time domain location for the SCI in the slot, the second offset indicating the time domain location for each of the reference signals.
  • the second terminal device is caused to receive the allocation information by using the RRC signaling; and the second terminal device is further caused to receive the SCI in a slot, the SCI indicating at least one of the following: a first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the second terminal device is caused to receive the at least one of the reference signals by receiving a first subset of the reference signals in symbols in a slot, the first subset of the reference signals being frequency-division multiplexed with sidelink data in the symbols in the slot.
  • the second terminal device is caused to receive the first subset of the reference signals by using a single energy per resource element (EPRE) for the first subset of the reference signals and the sidelink data.
  • EPRE energy per resource element
  • the second terminal device is caused to receive the at least one of the reference signals by receiving a first subset of the reference signals in a slot, the first subset of the reference signals being not frequency-division multiplexed with sidelink data in a same symbol in the slot.
  • a first transmit power of energy per resource element (EPRE) for the first subset of the reference signals is equal to a second transmit power of EPRE for the sidelink data.
  • EPRE energy per resource element
  • the second terminal device is further caused to receive, from the first terminal device, sidelink data or the SCI in a slot by using a first type of beam;
  • the second terminal device is caused to receive a first subset of the reference signals in the slot by using a second type of beam.
  • the resources for the reference signals comprise dedicated resources in a sidelink resource pool, and a subset of the dedicated resources is associated with a sidelink slot in the sidelink resource pool.
  • the second terminal device is further caused to determine the dedicated resources based on a configuration or pre-configuration by higher layer.
  • the configuration or pre-configuration comprises a first bandwidth of the dedicated resources.
  • the configuration or pre-configuration comprises a first starting symbol and a first symbol length of the dedicated resources.
  • the configuration or pre-configuration comprises a first symbol length of the dedicated resources; and the second terminal device is caused to determine a first starting symbol of the dedicated resources based on a second starting symbol and a second symbol length of sidelink slots in the sidelink resource pool.
  • the allocation information comprises at least one of the following for each of the reference signals: a resource element location in a resource block, or a symbol location in the subset of the dedicated resources.
  • the second terminal device is further caused to determine an initial symbol in the subset of the dedicated resources to be an automatic gain control (AGC) symbol.
  • AGC automatic gain control
  • the second terminal device is further caused to receive, from the first terminal device, sidelink data or the SCI by using a first type of beam; and the second terminal device is caused to receive a first subset of the reference signals and an AGC signal by using a second type of beam.
  • the resources for the reference signals are comprised in a dedicated resource pool for the reference signals.
  • the dedicated resource pool and a sidelink resource pool are configured with a single bandwidth part.
  • the RRC signaling indicates the allocation information
  • the SCI indicates at least one of the following: at least one first subset of the reference signals to be transmitted in a slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling indicates a frequency domain location in a resource block for each of the reference signals; and the SCI indicates at least one of the following: a time domain location in a slot for each of the reference signals, at least one first subset of the reference signals to be transmitted in the slot, or at least one second subset of the reference signals to be transmitted in at least one reserved slot subsequent to the slot.
  • the RRC signaling or the SCI further indicates at least one reserved sub-channels for the reference signals.
  • the SCI comprises first SCI associated with a first unicast link between the first terminal device and the second terminal device, the first SCI indicating at least one of the following: a first source identity of the first unicast link, a first destination identity of the first unicast link, a first subset of the reference signals to be transmitted to the second terminal device in a slot, or at least one second subset of the reference signals to be transmitted to the second terminal device in at least one reserved slot subsequent to the slot.
  • the SCI further comprises second SCI associated with a second unicast link between the first terminal device and the third terminal device, the second SCI indicating at least one of the following: a second source identity of the second unicast link, a second destination identity of the second unicast link, a third subset of the reference signals to be transmitted to the third terminal device in the slot, or at least one fourth subset of the reference signals to be transmitted to the third terminal device in at least one reserved slot subsequent to the slot.
  • the first SCI further indicates at least one of the following: a second destination identity of the second unicast link, a third subset of the reference signals to be transmitted to the third terminal device in the slot, or at least one fourth subset of the reference signals to be transmitted to the third terminal device in at least one reserved slot subsequent to the slot.
  • the first SCI further indicates a time domain location within the slot for the second SCI.
  • the second terminal device is further caused to receive the SCI by using a first type of beam; and the second terminal device is caused to receive a first subset of the reference signals by using a second type of beam.
  • the first type of beam is different from the second type of beam.
  • a first width of the first type of beam has wider coverage than a second width of the second type of beam.
  • the second terminal device is caused to receive the first subset of the reference signals by switching the first type of beam to the second type of beam at an initial symbol location for the first subset of the reference signals.
  • the first type of beam is the same as the second type of beam.
  • the second terminal device is caused to receive the SCI and an initial transmission of the first subset of the reference signals by using a first beam of the second type.
  • the second terminal device is caused to: receive the SCI by using a first beam of the second type; and receive the first subset of the reference signals by using a set of beams of the second type, the first beam being comprised in the set of beams.
  • the second terminal device is further caused to determine a transmission block size associated with sidelink data in a slot based on at least one of the following: the number of resource elements (REs) used for a first subset of the reference signals in the slot, a configured or pre-configured symbol number in the slot used for the first subset of the reference signals, or an average number of REs for the reference signals.
  • REs resource elements
  • 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente divulgation concernent des dispositifs, des procédés et des supports lisibles par ordinateur pour des communications de liaison latérale. Un premier dispositif terminal transmet, à un second dispositif terminal, une configuration pour des signaux de référence en vue d'une gestion de faisceau de liaison latérale à l'aide d'une signalisation RRC et/ou de SCI. À son tour, le premier dispositif terminal transmet, au second dispositif terminal, au moins l'un des signaux de référence sur la base de la configuration.
PCT/CN2023/092759 2023-05-08 2023-05-08 Dispositifs, procédés et support lisible par ordinateur pour des communications de liaison latérale Pending WO2024229654A1 (fr)

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US20220015139A1 (en) * 2018-11-01 2022-01-13 Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University) Method for performing vehicle communication and device therefor
CN114270721A (zh) * 2019-08-16 2022-04-01 高通股份有限公司 基于侧链路的信道状态信息
US20220338174A1 (en) * 2020-01-03 2022-10-20 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Wireless communication method and terminal device
US20230051721A1 (en) * 2021-08-11 2023-02-16 Qualcomm Incorporated Short reference signals for sidelink communication
WO2023049133A2 (fr) * 2021-09-22 2023-03-30 Qualcomm Incorporated Rapport de configuration de signal de référence de liaison latérale et de signal de référence de liaison descendante

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US20220015139A1 (en) * 2018-11-01 2022-01-13 Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University) Method for performing vehicle communication and device therefor
CN114270721A (zh) * 2019-08-16 2022-04-01 高通股份有限公司 基于侧链路的信道状态信息
US20220338174A1 (en) * 2020-01-03 2022-10-20 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Wireless communication method and terminal device
US20230051721A1 (en) * 2021-08-11 2023-02-16 Qualcomm Incorporated Short reference signals for sidelink communication
WO2023049133A2 (fr) * 2021-09-22 2023-03-30 Qualcomm Incorporated Rapport de configuration de signal de référence de liaison latérale et de signal de référence de liaison descendante

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