WO2022056909A1 - Procédé de communication et appareil de communication - Google Patents

Procédé de communication et appareil de communication Download PDF

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Publication number
WO2022056909A1
WO2022056909A1 PCT/CN2020/116504 CN2020116504W WO2022056909A1 WO 2022056909 A1 WO2022056909 A1 WO 2022056909A1 CN 2020116504 W CN2020116504 W CN 2020116504W WO 2022056909 A1 WO2022056909 A1 WO 2022056909A1
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WIPO (PCT)
Prior art keywords
information
synchronization
terminal device
transmission resource
sidelink
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PCT/CN2020/116504
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English (en)
Chinese (zh)
Inventor
刘荣宽
卢磊
张鹏
许华
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华为技术有限公司
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Priority to PCT/CN2020/116504 priority Critical patent/WO2022056909A1/fr
Publication of WO2022056909A1 publication Critical patent/WO2022056909A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/46—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for vehicle-to-vehicle communication [V2V]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication, and more particularly, to a communication method and a communication device.
  • D2D device-to-device
  • the application of D2D technology can reduce the burden of cellular networks, reduce battery power consumption of user equipment, increase data rates, and can well meet the needs of proximity services.
  • the D2D technology allows multiple D2D-enabled user equipment (UE) to perform direct discovery and direct communication with or without network infrastructure.
  • UE D2D-enabled user equipment
  • V2X vehicle-to-everything
  • V2X vehicle-to-everything
  • V2X vehicle-to-everything
  • the communication protocol between the UE and the UE is called a PC5 port, and the corresponding link is called a sidelink (sidelink, SL).
  • wireless multi-hop communication is a form of wireless communication networking, which can effectively expand the coverage of the network.
  • the communication devices need to be synchronized, that is, the terminal device needs to be synchronized with other terminal devices or the network, but the prior art
  • the subordinate terminal equipment when some terminal equipment cannot be obtained by the network (for example, outside the network coverage) and there are no available transmission resources, because the terminal equipment cannot send synchronization information, the subordinate terminal equipment (wherein , its subordinate terminal equipment can be understood as located within the coverage of the terminal equipment, but cannot receive synchronization information, resulting in other terminal equipment that cannot synchronize with the network or terminal equipment) can not receive synchronization information, which in turn causes its Subordinate terminal equipment becomes a communication blind spot.
  • the present application provides a communication method and communication device.
  • the terminal equipment In the sidelink, by instructing the terminal equipment to send synchronization information, and instructing the terminal equipment to transmit the synchronization information, the terminal equipment that cannot obtain the transmission resources can send the synchronization information. , so that its subordinate terminal equipment located outside the network coverage can obtain synchronization information and perform network synchronization, and then can overcome the multi-hop node scenario, the node cannot send synchronization information without transmission resources, resulting in top-down In the step-by-step synchronization process, the subordinate nodes (terminal devices) cannot obtain synchronization information, which becomes a problem of communication blind spots.
  • a communication method includes: a first terminal device sends first information through a sidelink, where the first information is used to instruct a second terminal device to send synchronization information; the first terminal The device sends second information through the sidelink, where the second information is used to indicate a first transmission resource, and the first transmission resource is used to carry the synchronization information.
  • the terminal equipment In the side link, by instructing the terminal equipment to send synchronization information, and instructing the terminal equipment to send the transmission resources of the synchronization information, the terminal equipment that cannot obtain the transmission resources can send the synchronization information, so that the terminal equipment located outside the network coverage can be made to send the synchronization information. Its subordinate terminal equipment can obtain synchronization information and perform network synchronization, and then can overcome the multi-hop node scenario, the node cannot send synchronization information without transmission resources, resulting in the top-down synchronization process, subordinate nodes (terminals). devices) cannot obtain synchronization information and become a communication blind spot.
  • a subordinate node or a subordinate terminal device in this application can be understood as being located within the coverage of the first terminal device, but cannot receive synchronization information, resulting in a second terminal that cannot be synchronized with the network or the terminal device. equipment.
  • the second information includes information about the period of the first transmission resource and/or information about the subcarrier spacing of the first transmission resource.
  • the terminal device can obtain the transmission resource for sending the synchronization information, thereby sending the synchronization information, and further, the subordinate terminal device that has received the synchronization information can complete the synchronization process, avoiding Devices become the problem of communication blind spots.
  • the method further includes: the first terminal device sends third information through the sidelink, where the third information is used to indicate the The first identifier in the synchronization information sent by the second terminal device, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • the first terminal device may indicate an identifier in the synchronization information sent by the second terminal device, and the identifier is used for the terminal device receiving the synchronization information to perform synchronization by using the identifier.
  • the synchronization source is the synchronization source used by the terminal device that receives the synchronization information sent by the second terminal device to perform synchronization.
  • the third information may include a specific identifier.
  • the first terminal device directly instructs the second terminal device to send the identifier of the synchronization information, wherein the identifier may be the same as the synchronization information sent by the first terminal device.
  • the identifier of the first terminal device is the same, or may be different from the identifier of the synchronization information sent by the first terminal device.
  • the third information may also include a value range of the identifier.
  • the second terminal device may select an identifier from the value range as an identifier for sending synchronization information.
  • the first information is carried in sidelink control information
  • the sidelink control information includes any one of the following information: radio resource control RRC layer sidelink control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • the embodiments of the present application may be applied to the SL discovery and SL communication processes.
  • the first information may be carried in the RRC layer sideline control information, for example, PC5 RRC;
  • the first information may be carried in the above three types of sideline control information, wherein the RRC layer sideline control information may be PC5 RRC, and the MAC layer sideline control information may be SL MAC CE.
  • Physical layer side row control information can be SCI, or 2nd stage SCI, or 1st stage SCI.
  • the second information is carried in sidelink control information
  • the sidelink control information includes any one of the following information: radio resource control RRC layer sidelink control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • the third information is carried in sidelink control information
  • the sidelink control information includes any one of the following information: radio resource control RRC layer sidelink control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • first information, second information and third information may be carried in the same control information, or may be carried in different control information, which is not limited in this application.
  • sending the first information by the first terminal device through the sidelink includes: the first terminal device transmits the first information through the sidelink in the second transmission The first information is sent on a resource, wherein the second transmission resource is indicated by the first terminal device, or the second transmission resource is indicated by a network device.
  • the sending, by the first terminal device, the second information through the sidelink includes: the first terminal device using the sidelink, The second information is sent on a third transmission resource, where the third transmission resource is indicated by the first terminal device, or the third transmission resource is indicated by a network device.
  • the sending, by the first terminal device, the third information through the sidelink includes: the first terminal device using the sidelink, The third information is sent on a fourth transmission resource, where the fourth transmission resource is indicated by the first terminal device, or the fourth transmission resource is indicated by a network device.
  • the above-mentioned transmission resource for sending information by the first terminal device may be configured locally by the first terminal device, or may also be configured by the first terminal device according to a network instruction.
  • the first transmission resource is configured by the first terminal device according to an instruction of a network device.
  • the transmission resource for the first terminal device to instruct the second terminal device to send the synchronization information may be configured by the network device for the first terminal device.
  • the transmission resource may be the network device. It is directly configured for the first terminal device, or, when the first terminal device is located outside the coverage of the network, the transmission resource is allocated by the first terminal device according to the transmission resources allocated to it by the previously connected network device, that is, this application The first terminal device is currently outside the network coverage area, but has previously been connected to the network.
  • a communication method includes: a second terminal device receives first information through a sidelink, where the first information is used to instruct the second terminal device to send synchronization information; the first information The second terminal device receives second information through the sidelink, where the second information is used to indicate the first transmission resource, and the first transmission resource is used to carry the synchronization information; the second terminal device The first information and the second information are sent, and the synchronization information is sent.
  • the synchronization information can be sent, so that the subordinate terminal equipment of the second terminal equipment located outside the network coverage can receive the synchronization information and perform synchronization.
  • the problem that the terminal equipment outside the range cannot send synchronization information further solves the problem that the terminal equipment subordinate to the second terminal equipment becomes a communication blind spot because the second terminal equipment cannot send synchronization information.
  • the second information includes information about the period of the first transmission resource and/or information about the subcarrier spacing of the first transmission resource.
  • the second terminal device can send the synchronization information, and further, the subordinate node that receives the synchronization information can complete the synchronization process to avoid the problem that the subordinate node becomes a communication blind spot.
  • the method further includes: the second terminal device receives third information through the sidelink, where the third information is used to indicate the The first identifier in the synchronization information sent by the second terminal device, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • the second terminal device can determine the identifier for sending the synchronization information, so that the terminal device that has received the synchronization information can complete the synchronization, thereby preventing the terminal device from being unable to complete the synchronization and becoming a communication blind spot.
  • a communication apparatus comprising: a first sending module configured to send first information through a sidelink, where the first information is used to instruct a second terminal device to send synchronization information; the The first sending module is further configured to send second information through the sidelink, where the second information is used to indicate a first transmission resource, and the first transmission resource is used to carry the synchronization information.
  • the second information includes information of a period of the first transmission resource and/or information of a subcarrier spacing of the first transmission resource.
  • the first sending module is further configured to: send third information through the sidelink, where the third information is used to indicate the second The first identifier in the synchronization information sent by the terminal device, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • the first information is carried in sidelink control information
  • the sidelink control information includes any one of the following information: radio resource control RRC layer sidelink control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • the second information is carried in sidelink control information
  • the sidelink control information includes any one of the following information: radio resource control RRC layer sidelink control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • the third information is carried in sidelink control information, and the sidelink control information includes any one of the following information: radio resource control RRC layer sidelink control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • the first sending module is specifically configured to: send the first information on the second transmission resource through the sidelink, wherein the The second transmission resource is indicated by the first terminal device, or the second transmission resource is indicated by a network device.
  • the first sending module is specifically configured to: send the second information on the third transmission resource through the sidelink, wherein the The third transmission resource is indicated by the first terminal device, or the third transmission resource is indicated by a network device.
  • the first sending module is specifically configured to: send the third information on the fourth transmission resource through the sidelink, wherein the The fourth transmission resource is indicated by the first terminal device, or the fourth transmission resource is indicated by a network device.
  • the apparatus further includes: a processing module configured to configure the first transmission resource according to an indication of a network device.
  • a communication device comprising: a second receiving module configured to receive first information through a sidelink, where the first information is used to instruct the device to send synchronization information; the first information
  • the second receiving module is further configured to: receive second information through the sidelink, where the second information is used to indicate a first transmission resource, and the first transmission resource is used to carry the synchronization information; a second sending module , for sending the synchronization information according to the first information and the second information.
  • the second information includes information about the period of the first transmission resource and/or information about the subcarrier spacing of the first transmission resource.
  • the second receiving module is further configured to: receive third information through the sidelink, where the third information is used to indicate the second The first identifier in the synchronization information sent by the terminal device, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • a communication device in a fifth aspect, has the function of implementing the methods described in the above aspects.
  • This function can be implemented by hardware or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • a communication device comprising: a processor; the processor is coupled to a memory, and used to call and run a computer program from the memory to execute the above-mentioned aspects or any possible possibilities of the various aspects. method in the implementation.
  • a communication device including a processor and a memory, where the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes the above aspects or each A method in any possible implementation of an aspect.
  • an apparatus eg, the apparatus may be a system-on-a-chip
  • the apparatus including a processor for supporting the communication apparatus to implement the functions involved in the above aspects.
  • the device further includes a memory for storing necessary program instructions and data of the communication device.
  • the device When the device is a system-on-chip, it may be composed of chips, or may include chips and other discrete devices.
  • a computer-readable storage medium for storing a computer program, the computer program comprising instructions for performing a method as described above in each aspect or in any possible implementation of each aspect.
  • a computer program product comprising a computer program which, when run on a computer device, causes the computer device to perform the method according to the above aspects.
  • a communication system in an eleventh aspect, includes a first terminal device, a second terminal device, and a network device therein; the first terminal device is configured to perform the above-mentioned first aspect, or the embodiments of the present application provide The steps performed by the first terminal device in the scheme of In this aspect, or the steps performed by the network device in the solutions provided by the embodiments of the present application.
  • FIG. 1 is a schematic diagram of a sidelink synchronization technique in LTE.
  • FIG. 2 is a schematic diagram of another sidelink synchronization technique in LTE.
  • FIG. 3 is a schematic diagram of another sidelink synchronization technique in LTE.
  • FIG. 4 is a schematic diagram of a sidelink synchronization technique in NR.
  • 5 is a schematic diagram of another sidelink synchronization technique in NR.
  • FIG. 6 is a schematic diagram of an application scenario of an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another application scenario of an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a communication method according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of another communication method according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a synchronization process in a sidelink according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a synchronization process in another sidelink according to an embodiment of the present application.
  • FIG. 12 is a schematic diagram of a synchronization process in another sidelink according to an embodiment of the present application.
  • FIG. 13 is a schematic diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 14 is a schematic diagram of another communication apparatus according to an embodiment of the present application.
  • FIG. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application.
  • FIG. 16 is another schematic structural diagram of a communication device according to an embodiment of the present application.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • long term evolution long term evolution
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • the terminal device in this embodiment of the present application is a device with a wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed In the air (eg in airplanes, balloons, satellites, etc.).
  • the terminal can be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, industrial control (industrial) wireless terminals in control), in-vehicle terminal equipment, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ), wireless terminals in smart cities, wireless terminals in smart homes, wearable terminal devices, etc.
  • the embodiments of the present application do not limit application scenarios.
  • a terminal may also sometimes be referred to as terminal equipment, user equipment (UE), access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, terminal equipment, wireless communication equipment, UE proxy or UE device, etc.
  • Terminals can also be stationary or mobile. This embodiment of the present application does not limit this.
  • the network device in this embodiment of the present application may be any device with a wireless transceiver function. Including but not limited to: evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, base station (gNodeB or gNB) or transceiver point (transmission receiving point/transmission receiving point, TRP) in NR, 3GPP Subsequent evolution of base stations, access nodes in WiFi systems, wireless relay nodes, wireless backhaul nodes, etc.
  • the base station can be: a macro base station, a micro base station, a pico base station, a small base station, a relay station, or a balloon station, etc.
  • Multiple base stations may support the above-mentioned networks of the same technology, or may support the above-mentioned networks of different technologies.
  • a base station may contain one or more co-sited or non-co-sited TRPs.
  • the network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (distributed unit, DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the network device can also be a server, a wearable device, or a vehicle-mounted device.
  • the following description takes the network device as the base station as an example.
  • the multiple network devices may be the same type of base station, or may be different types of base stations.
  • the base station can communicate with the terminal equipment, and can also communicate with the terminal equipment through the relay station.
  • the terminal device can communicate with multiple base stations of different technologies.
  • the terminal device can communicate with the base station supporting the LTE network, the base station supporting the 5G network, and the base station supporting the LTE network and the base station of the 5G network. Dual connection.
  • the embodiments of the present application are not limited.
  • D2D device-to-device
  • the application of D2D technology can reduce the burden of cellular networks, reduce battery power consumption of user equipment, increase data rates, and can well meet the needs of proximity services.
  • the D2D technology allows multiple D2D-enabled user equipment (UE) to perform direct discovery and direct communication with or without network infrastructure.
  • UE D2D-enabled user equipment
  • V2X vehicle-to-everything
  • the 3GPP standards organization officially released the first-generation LTE V2X standard in early 2017, LTE version number Release 14.
  • 5G NR V2X is further studied in the 3GPP standards organization.
  • the communication protocol between the UE and the UE is called a PC5 port, and the corresponding link is called a sidelink (sidelink, SL).
  • wireless multi-hop communication is a form of wireless communication networking, which can effectively expand the coverage of the network.
  • the transmission from the source to the sink there may be multiple relay nodes to forward the data. Since the reception and transmission of communication are the main factors of power consumption of wireless devices, and long-distance data transmission requires high transmit power, it cannot meet the long-term work requirements of energy-constrained devices. Therefore, the transmission power can be appropriately reduced, and data communication can be completed through multi-hop transmission to improve energy efficiency.
  • the existing synchronization technologies in the sidelink are mainly the LTE sidelink synchronization technology and the NR sidelink synchronization technology.
  • the sidelink synchronization technology of LTE may include sidelink discovery (SL discovery) and sidelink communication and V2X sidelink communication, wherein, for SL discovery, the synchronization information may include sidelink synchronization Signal (sidelink synchronization signal, SLSS), for public safety-related discovery mechanisms, also includes timing information and additional configuration information.
  • SLSS sidelink synchronization Signal
  • synchronization information includes master information block (MIB) messages on SLSS and SL, namely MasterInformationBlock-SL or MasterInformationBlock-SL-V2X messages, as shown in the figure 1 to 3 respectively show schematic diagrams of sidelink synchronization techniques in LTE.
  • MIB master information block
  • Fig. 1 shows the synchronization information transmission process of SL communication or V2X SL communication when the UE is within the network coverage or part of the coverage, including steps S101-S103, the UE obtains the SIB message from the base station, and the E- After RRC reconfiguration is performed between UTRAN (radio access network, evolved universal mobile telecommunications system terrestrial radio access network), based on the information obtained from E-UTRAN, SL synchronization information is sent, wherein, in SL communication, the synchronization information may include SLSS&MIB-SL, in V2X SL communication, the synchronization information can include SLSS&MIB-SL-V2X.
  • UTRAN radio access network, evolved universal mobile telecommunications system terrestrial radio access network
  • Fig. 2 shows the synchronization information transmission process of SL communication or V2X SL communication or SL discovery when the UE is out of the network coverage, including steps S201 and S202, wherein the UE passes a pre-configured threshold and obtains according to the measurement
  • the sidelink reference signal received power (S-RSRP) with other UEs determines that SL synchronization information needs to be sent.
  • the synchronization information may include SLSS&MIB-SL, and for SLV2X communication That said, the synchronization information may include SLSS & MIB-SL-V2X.
  • Figure 3 shows the synchronization information transmission process of SL discovery when the UE is located within the network coverage or within the partial coverage. Including steps S301 to S303, the UE obtains the SIB message from the E-UTRAN, and after completing the RRC reconfiguration, sends synchronization information based on the information obtained from the E-UTRAN, where the synchronization information may include SLSS, optionally, MIB- SL.
  • the UE When the UE is located within the network coverage and the E-UTRAN configures the UE to send synchronization information through dedicated signaling, the UE sends the synchronization information.
  • the UE can broadcast a threshold syncTxThreshIC by receiving E-UTRAN.
  • the UE can broadcast a threshold syncTxThreshIC by receiving E-UTRAN.
  • certain conditions for example, the RSRP measurement result is lower than the value of syncTxThreshIC
  • the UE Send synchronization information.
  • the UE When the UE is located outside the network coverage and is not configured through dedicated signaling, but the UE has a pre-configured threshold syncTxThreshOoC, when certain conditions are met (for example, the S-RSR P measurement result is lower than the value of syncTxThreshOoC), The UE sends synchronization information.
  • FIG. 4 shows the synchronization information transmission process of NR SL communication when the UE is located within the network coverage or within the partial coverage, including S401 to S403, and Fig. 5 shows when the UE is located outside the network coverage , the synchronization information transmission process of NR SL communication, including S501 and S502,.
  • the specific transmission process is similar to the description in FIG. 1 to FIG. 3 , and details are not repeated here.
  • NR taking NR SL communication as an example, from the UE's point of view, a UE with NR SL communication capability and SLSS/Physical sidelink broadcast channel (PSBCH), when performing NR SL communication , and the NR SL communication working conditions are met, and the synchronization information can be sent when the following conditions are met:
  • PSBCH Physical sidelink broadcast channel
  • the UE For the frequency used for NR SL communication, the UE is out of coverage, and the frequency used to transmit NR SL communication is included in the sl-FreqInfoToAddModList in the sl-ConfigDedicatedNR field in the RRCReconfiguration message, or included in the sl-FreqInfoToAddModList of SIB12. FreqInfoList, and GNSS or cell is selected as synchronization source:
  • the UE selects GNSS as the synchronization source.
  • the UE may send the SL synchronization information under the network instruction, or in the absence of the network instruction, when the measured RSRP measurement result is lower than a certain threshold (network broadcast, or pre-configured) , send SL synchronization information.
  • a certain threshold network broadcast, or pre-configured
  • the premise of these mechanisms is that the UE can obtain transmission resources for sending synchronization information, or that the UE can still use historical transmission resources under certain conditions (for example, the UE has previously connected to the network and obtained transmission resource information, but currently disconnected from the network).
  • the UE when the UE is unavailable in the network (for example, out of coverage) and there are no available pre-configured resources, since the UE cannot send synchronization information, its subordinate UEs cannot receive the synchronization information, let alone send the synchronization information, resulting in the UE becoming a communication blind spot. .
  • FIG. 6 is a schematic diagram of an application scenario of the embodiment of the present application.
  • the schematic diagram of the scenario may correspond to the above-described situation in which the UE is located within the coverage of the network in the LTE and NR communications.
  • UE-A is within the coverage of the gNB and can synchronize with the gNB through the uu port.
  • gNB can configure UE-A to send synchronization information through dedicated signaling; or, when UE-A receives the threshold syncTxThreshIC broadcast by gNB, and the RSRP measurement result of UE-A's reference cell is lower than the threshold syncTxThreshIC, UE-A sends synchronization information information.
  • UE-B When UE-B is outside the coverage boundary of gNB and UE-B is within the coverage boundary of UE-A, although UE-B cannot directly synchronize with gNB through the uu port, UE-B can receive the SL sent by UE-A by receiving the SL
  • the synchronization information can complete the synchronization with the network; or, the UE-B can complete the synchronization with the UE-A by receiving the SL synchronization information sent by the UE-A.
  • FIG. 7 shows a schematic diagram of another application scenario of the embodiment of the present application.
  • This schematic diagram of the scenario may correspond to the above-described situation in which the UE is located outside the coverage of the network in the LTE and NR communications.
  • UE-B is within the coverage of UE-A
  • UE-C is outside the coverage of UE-A.
  • the threshold syncTxThreshOoC is pre-configured by UE-A and the S-RSRP measurement result of UE-A not selecting the synchronization reference UE or the synchronization reference UE is lower than the threshold syncTxThreshOoC
  • UE-A sends synchronization information.
  • the existing mechanism cannot support UE-B to send SL synchronization information when no transmission resources are available, resulting in UE-C becoming a communication blind spot.
  • the embodiment of the present application provides a communication method.
  • the terminal device that cannot obtain the transmission resource can send the synchronization information.
  • its subordinate terminal equipment located outside the network coverage can obtain synchronization information and perform synchronization, and then can overcome the multi-hop node scenario, the node cannot send synchronization information without transmission resources, resulting in top-down
  • subordinate nodes terminal devices cannot obtain synchronization information, which becomes a problem of communication blind spots.
  • the subordinate node or subordinate terminal device in the embodiments of the present application can be understood as being located within the coverage of the first terminal device, but cannot receive synchronization information, resulting in a failure to synchronize with the network or the terminal device.
  • the second terminal device alternatively, can also be understood as a terminal device that is located within the coverage of other terminal devices in a multi-hop node scenario, but cannot receive synchronization information, resulting in the inability to synchronize with the network or the terminal device.
  • This application The embodiments of the 2000 do not limit the representation of the terminal equipment, as long as the subordinate relationship thereof can be accurately expressed.
  • FIG. 8 shows a schematic diagram of a communication method according to an embodiment of the present application. As shown in FIG. 8 , the method includes steps S810 and S820 , which are described in detail below.
  • the first terminal device sends first information through the sidelink, where the first information is used to instruct the second terminal device to send synchronization information.
  • the first information may be sent in a manner of "indication of sending SL synchronization information", and the first information may be used to instruct to activate/deactivate the sending of SL synchronization information.
  • the first information may be indicated in an explicit manner, or may be indicated in an implicit manner.
  • the first terminal device sends second information through the sidelink, where the second information is used to indicate the first transmission resource.
  • the first transmission resource is used to carry the synchronization information.
  • the second information may be sent by means of "SL synchronization information configuration information".
  • the second information may be indicated by means of display.
  • the transmission resource indicated by the first terminal device for the second terminal device may be configured by the first terminal device according to the instruction of the network device.
  • a possible way is that the first terminal device is currently located within the network coverage. , therefore, the first terminal device can obtain the configured first transmission resource, or, another possible way is that the first terminal device was previously connected to the network device but is currently disconnected, and the first terminal device can use the
  • the first transmission resource is configured for the second terminal device with the historical resource obtained when connecting with the network device before.
  • the second information may be used to indicate information such as a period of transmission resources and sub-carriers.
  • the second information includes information about the period of the first transmission resource and/or the first transmission Information about the subcarrier spacing of the resource.
  • the second information includes information of the period of the first transmission resource and/or information of the subcarrier interval of the first transmission resource may include synchronization information or synchronization signal block (synchronization signal block, SSB) transmission Period, SSB subcarrier spacing, etc.
  • synchronization information synchronization signal block, SSB
  • SSB synchronization signal block
  • the first terminal device may instruct the second terminal device to send an identifier of the synchronization information, and the identifier is used for the terminal device receiving the synchronization information of the second terminal device to perform Synchronization
  • the method further includes: the first terminal device sends third information through the sidelink, where the third information is used to indicate that the synchronization information sent by the second terminal device is included in the synchronization information.
  • the first identifier is used to indicate the synchronization source of the synchronization process.
  • the third message sent by the first terminal device may be a specific identifier, such as synchronization information or a synchronization signal block identifier (synchronization signal identify, SL SSID).
  • the first terminal device directly specifies the second terminal device.
  • the identifier of the synchronization information sent it should be understood that the identifier designated by the first terminal device for the second terminal device may be the same as or different from the identifier of the synchronization information sent by the first terminal device, which is not limited in this application.
  • the third message sent by the first terminal device may also include a value range of the identifier.
  • the second terminal device may select a specific identifier from the value range as an identifier for sending synchronization information.
  • the above-mentioned first information, second information, and third information may be carried in policy control information.
  • the first information is carried in sideline control information
  • the sideline control information includes the following Any kind of information: radio resource control RRC layer sideline control information, medium access control MAC layer sideline control information, and physical layer sideline control information.
  • the second information is carried in sideline control information, and the sideline control information includes any one of the following information: radio resource control RRC layer sideline control information, medium access control MAC layer sideline control information, physical layer side control information row control information.
  • the third information is carried in sideline control information, and the sideline control information includes any one of the following information: radio resource control RRC layer sideline control information, medium access control MAC layer sideline control information, physical layer side row control information.
  • radio resource control layer (radio resource control, RRC) layer sideline control information may be PC5 RRC
  • media access control layer (media access control, MAC) layer sideline control information may be SL MAC CE (control unit, control element).
  • the physical layer sideline control information may be sidelink control information (SCI), or 2nd stage SCI, or 1st stage SCI.
  • first information, second information and third information may be carried on the same sideline control information, or may be carried on different sideline control information, which is not limited in this application.
  • the above-mentioned transmission resources for the first terminal device to send the first information, the second information, and the third information may be locally configured by the first terminal device, or may also be acquired by the first terminal device from a network device.
  • the sending of the first information by the first terminal device through the sidelink includes: the first terminal device sends the first information on the second transmission resource through the sidelink, wherein the first information is The second transmission resource is indicated by the first terminal device, or the second transmission resource is indicated by the network device.
  • the sending, by the first terminal device, the second information through the sidelink includes: the first terminal device sending the second information on a third transmission resource through the sidelink, wherein the The third transmission resource is indicated by the first terminal device, or the third transmission resource is indicated by a network device.
  • the sending, by the first terminal device, the third information through the sidelink includes: the first terminal device sending the third information on a fourth transmission resource through the sidelink, wherein the The fourth transmission resource is indicated by the first terminal device, or the fourth transmission resource is indicated by a network device.
  • the embodiment of the present application relates to a sidelink communication scenario.
  • the terminal device By instructing the terminal device to send synchronization information, and instructing the terminal device to transmit the transmission resource for the synchronization information, the terminal device that cannot obtain the transmission resource can send the synchronization information, thereby enabling the terminal device located in the network to send the synchronization information.
  • Its subordinate terminal equipment outside the coverage area can acquire synchronization information and perform network synchronization, thereby solving the problem that the subordinate terminal equipment becomes a communication blind spot.
  • FIG. 9 shows a schematic diagram of another communication method according to an embodiment of the present application. As shown in FIG. 9 , the method includes steps S910 to S930 , which are described in detail below.
  • the second terminal device receives first information through the sidelink, where the first information is used to instruct the second terminal device to send synchronization information.
  • the "SL synchronization information sending instruction" may be used to indicate activation/deactivation of SL synchronization information sending.
  • the second terminal device receives second information through the sidelink, where the second information is used to indicate a first transmission resource, and the first transmission resource is used to carry the synchronization information.
  • the second terminal device may acquire the transmission resource for sending the synchronization information according to the indication of the second information, so that the synchronization information may be sent.
  • the second information includes information about the period of the first transmission resource and/or information about the subcarrier spacing of the first transmission resource.
  • the second terminal device may also acquire, from the first terminal device, an identifier used in sending the synchronization information, where the identifier is used to indicate that the terminal device that received the synchronization information should synchronize with the network or terminal device corresponding to the identifier.
  • the method further includes: receiving, by the second terminal device through the sidelink, third information, where the third information is used to indicate the first part of the synchronization information sent by the second terminal device An identifier, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • the third information received by the second terminal device may include a specific identification value, such as synchronization information or a synchronization signal block identifier (SL SSID).
  • the second terminal device may directly use the first terminal device. Send synchronization information for the ID it specifies.
  • the third message received by the second terminal device may also include a value range of the identifier.
  • the second terminal device may select a specific identifier from the value range as an identifier for sending synchronization information.
  • the second terminal device sends the synchronization information according to the first information and the second information.
  • the embodiment of the present application relates to a sidelink communication scenario.
  • the second terminal device can send the synchronization information by receiving the instruction information for sending the synchronization information and the transmission resource for sending the synchronization information, so that the second terminal device located outside the network coverage can transmit the synchronization information.
  • the subordinate terminal equipment can receive the synchronization information and perform synchronization, and then can overcome the multi-hop node scenario where the second terminal equipment has no transmission resources and cannot send synchronization information, resulting in the top-down synchronization process, the subordinate node ( terminal equipment) cannot obtain synchronization information, which becomes a problem of communication blind spots.
  • FIG. 10 is a schematic diagram of a synchronization process in a sidelink according to an embodiment of the present application.
  • the scenario involved in the embodiments of the present application is the synchronization process that occurs during the SL discovery and SL communication process when UE A is within the coverage of the gNB or the network and UE A receives the dedicated signaling instruction of the gNB or the network for configuration.
  • Figure 10 shows that
  • UE-A receives a SIB (system information block) message from a gNB through a uu interface, and completes the acquisition of the SIB message.
  • SIB system information block
  • RRC message configuration including UE-A receiving the RRC configuration message from the gNB, specifically, may be RRC Reconfiguration.
  • the synchronization with the gNB or the network will be completed. Refer to the prior art for this synchronization process.
  • UE A receives the dedicated signaling sent by the gNB.
  • the gNB instructs UE A to send SL synchronization information through dedicated signaling
  • the SL synchronization information can be SLSS, or SLSS and MasterInformationBlock-SL, and this step can refer to the prior art.
  • the gNB when the UE is in the RRC_CONNECTED state, the gNB can also instruct UE A to send SL synchronization information through dedicated signaling.
  • the RRC configuration message received by UE-A from the gNB contains When the value of networkControlledSyncTx is on, that is, when gNB configures UE-A through dedicated signaling, gNB instructs UE-A to send SL synchronization information.
  • the SL synchronization information may include SLSS and SL MIB.
  • SL synchronization information also known as SL SSB, includes SLSS and SL MIB.
  • the process is similar to SL discovery, except that in the SL synchronization information sent by UE A, for LTE, the SL synchronization information can also be SLSS and MasterInformationBlock-SL-V2X.
  • UE B receives the first SL synchronization information from UE A.
  • the SL synchronization information may include SLSS and SL MIB, for UE-B to complete synchronization with UE-A, so as to further synchronize with the gNB or the network.
  • UE B receives the SL synchronization information sending instruction from UE A.
  • the "SL synchronization information sending instruction" may be used to indicate activation/deactivation of SL synchronization information sending.
  • the "SL synchronization information sending indication" can be carried on PC5 RRC.
  • the "SL synchronization information sending instruction” may be indicated in an explicit manner, or may be indicated in an implicit manner. It can be understood that the transmission resource of the "SL synchronization information sending indication" may be configured or indicated by UE-A.
  • the "SL synchronization information sending indication" can be carried on the SL MIB in the PC5 RRC, and there is an indication field in the display, indicating that the SL synchronization information is sent.
  • the SL MIB of the PC5 RRC is MasterInformationBlockSidelink, and the indication field contained therein is indicated by an integer, 1 indicates that the UE sends SL synchronization information, and 0 indicates that the UE does not send SL synchronization information.
  • the SL MIB of PC5 RRC is MasterInformationBlockSidelink
  • the indication field contained in it is indicated by an enumeration type
  • the members of the enumeration type include on and off, on means that the UE sends SL synchronization information, and off means that the UE does not send SL synchronization information.
  • a new RRC information element—SL SIB can be defined in PC5 RRC, and the “SL synchronization information sending indication” can be carried on the newly defined SL SIB message in PC5 RRC, and the , there may be an indication field, indicating that the SL synchronization information is sent.
  • the SL SIB of the PC5 RRC is SystemInformationBlockSidelink, and the indication field contained therein is indicated by an integer, 1 indicates that the UE sends SL synchronization information, and 0 indicates that the UE does not send SL synchronization information.
  • the SL SIB of PC5 RRC is SystemInformationBlockSidelink
  • the indication field contained in it is indicated by an enumeration type
  • the members of the enumeration type include on and off, on indicates that the UE sends SL synchronization information, and off indicates that the UE does not send SL synchronization information.
  • the "SL synchronization information sending indication" may be carried on the sideline control information, where the sideline control information may be the RRC layer sideline control information, or the MAC layer sideline control information , or the physical layer sideline control information.
  • the RRC layer side row control information may be PC5 RRC
  • the MAC layer side row control information may be SL MAC CE.
  • Physical layer side row control information can be SCI, or 2nd stage SCI, or 1st stage SCI. It can be understood that the "SL synchronization information sending instruction" may be indicated in an explicit manner, or may be indicated in an implicit manner. It can be understood that the transmission resource of the "SL synchronization information sending indication" may be configured or indicated by UE-A.
  • the "SL synchronization information sending indication" can be carried on the RRC layer sideline control information, for example, on the SL MIB in the PC5 RRC, where there is an indication field, indicating that the SL synchronization information is sent.
  • the SL MIB of the PC5 RRC is MasterInformationBlockSidelink, and the indication field contained therein is indicated by an integer, 1 indicates that the UE sends SL synchronization information, and 0 indicates that the UE does not send SL synchronization information.
  • the SL MIB of PC5 RRC is MasterInformationBlockSidelink
  • the indication field contained in it is indicated by an enumeration type
  • the members of the enumeration type include on and off, on means that the UE sends SL synchronization information, and off means that the UE does not send SL synchronization information.
  • a new RRC information element - SL SIB can also be defined in PC5 RRC, and the "SL synchronization information sending indication" can be carried on the newly defined SL SIB message in PC5 RRC, showing In addition, there is an indication field, indicating that the SL synchronization information is sent.
  • the SL SIB of the PC5 RRC is SystemInformationBlockSidelink, and the indication field contained therein is indicated by an integer, 1 indicates that the UE sends SL synchronization information, and 0 indicates that the UE does not send SL synchronization information.
  • the SL SIB of PC5 RRC is SystemInformationBlockSidelink
  • the indication field contained in it is indicated by an enumeration type
  • the members of the enumeration type include on and off, on indicates that the UE sends SL synchronization information, and off indicates that the UE does not send SL synchronization information.
  • the "SL synchronization information sending indication" can be carried on the SL MAC CE, and there is an indication field explicitly, indicating that the SL synchronization information is sent.
  • the indication field included in the SL MAC CE 1 indicates that the UE sends the SL synchronization information, and 0 indicates that the UE does not send the SL synchronization information.
  • the "SL synchronization information sending instruction" may be carried on the physical layer side line control information, and there is an indication field explicitly, indicating that the SL synchronization information is sent.
  • the indication field included in the physical layer side line control information 1 indicates that the UE sends the SL synchronization information, and 0 indicates that the UE does not send the SL synchronization information.
  • Physical layer side row control information can be SCI, or 2nd stage SCI, or 1st stage SCI.
  • the "SL synchronization information sending indication" may be carried on the line control information on the physical layer side, and implicitly, scrambled with 1 bit on the CRC of the line control information on the physical layer side, indicating the SL Synchronous information is sent.
  • the 1-bit scrambling is on the last bit of the CRC of the line control information on the physical layer side, and 1 indicates that the UE sends the SL synchronization information, and 0 indicates that the UE does not send the SL synchronization information.
  • the CRC of the line control information on the physical layer side is a 24-bit sequence of 0101 1010 0101 1010 0101 1010, which is 0101 1010 0101 1010 0101 1011 after scrambled with 1, indicating that the UE sends SL synchronization information.
  • Physical layer side row control information can be SCI, or 2nd stage SCI, or 1st stage SCI.
  • UE B receives the SL synchronization information configuration information from UE A.
  • the configuration information may include information used to instruct UE B to send the synchronization information transmission resource information
  • the transmission resource information may include synchronization information or synchronization signal block transmission period information, synchronization information or synchronization signal Block subcarrier spacing information.
  • the configuration information may also include synchronization information or synchronization signal block identification (SL SSID) information, and the identification information is used to indicate the identification in the SL synchronization information sent by UE B.
  • SL SSID synchronization signal block identification
  • the identification information may be specific synchronization information or a synchronization signal block identification SL SSID, that is, UE A directly instructs UE B to carry the identification SL SSID when sending the SL synchronization information to UE C, wherein UE A
  • the indicated identifier SL SSID can be the same as the identifier in the SL synchronization information sent by UE A in step S1004, and the identifier in S1004 is used by UE B to use the identifier to synchronize with the corresponding synchronization source, that is, UE A can Indicate the SL SSID used by itself to UE B, which is used for UE B to send the identity of the SL synchronization information, or the identity SL SSID indicated by UE A may also be different from UE A's own identity in S1004.
  • the synchronization information or synchronization signal block identification (SL SSID) information included in the configuration information sent by UE A may include the value range of the SL SSID. After UE B receives the configuration information, An SL SSID can be selected within this value range, which is used to send the identifier of the SL synchronization information to UE C.
  • SL SSID synchronization signal block identification
  • the synchronization information or the synchronization signal block identifier may be carried in the SL synchronization information configuration information, or may also be sent separately, which is not limited in this application.
  • the "SL synchronization information configuration information" may be indicated in a display manner.
  • the transmission resource of the "SL synchronization information configuration information" may be configured or indicated by UE-A.
  • the "SL synchronization information configuration information" can be carried in PC5 RRC.
  • the "SL synchronization information configuration information" can be carried on the SL MIB in the PC5 RRC, and there is an indication field explicitly, indicating the SL synchronization information configuration.
  • the SL MIB of PC5 RRC is MasterInformationBlockSidelink
  • the indication field contained therein includes synchronization information or synchronization signal block identifier (SL SSID), synchronization information or synchronization signal block (SSB) transmission period, synchronization information or synchronization signal block subcarriers Fields such as interval or indicating fields.
  • a new RRC information element—SL SIB can be defined in PC5 RRC, and the “SL synchronization information configuration information” can be carried on the newly defined SL SIB message in PC5 RRC, and the display , there is an indication field, indicating the SL synchronization information configuration.
  • the SL SIB of PC5 RRC is SystemInformationBlockSidelink, and the indication field contained therein includes synchronization information or synchronization signal block identifier (SL SSID), synchronization information or synchronization signal block (SSB) transmission cycle, synchronization information or synchronization signal block subcarriers Fields such as interval or indicating fields.
  • the "SL synchronization information configuration information" may be carried on the sideline control information, and the sideline control information may be RRC layer sideline control information, or MAC layer sideline control information, or On the sideline control information of the physical layer.
  • the RRC layer side row control information may be PC5 RRC
  • the MAC layer side row control information may be SL MAC CE.
  • Physical layer side row control information can be SCI, or 2nd stage SCI, or 1st stage SCI.
  • the "SL synchronization information configuration information" may be carried in the RRC layer sideline control information.
  • the SL MIB in the PC5 RRC sent by UE-A there is an indication field explicitly, indicating the SL synchronization information configuration.
  • the SL MIB of PC5 RRC is MasterInformationBlockSidelink, and the indication field contained therein includes synchronization information or synchronization signal block identifier (SL SSID), synchronization information or synchronization signal block (SSB) transmission period, synchronization information or synchronization signal block subcarriers Fields such as interval or indicating fields.
  • a new RRC information element—SL SIB can also be defined in PC5 RRC, and the “SL synchronization information configuration information” is carried on the SL SIB in PC5 RRC sent by UE-A, and there is an indication of presence field, indicating the SL synchronization information configuration.
  • the SL SIB of PC5 RRC is SystemInformationBlockSidelink, and the indication field contained therein includes synchronization information or synchronization signal block identifier (SL SSID), synchronization information or synchronization signal block (SSB) transmission cycle, synchronization information or synchronization signal block subcarriers Fields such as interval or indicating fields.
  • the "SL synchronization information configuration information" can be carried on the SL MAC CE sent by UE-A, and there is an indication field explicitly, indicating the SL synchronization information configuration.
  • the indication field included in the SL MAC CE includes fields such as synchronization information or synchronization signal block identifier (SL SSID), synchronization information or synchronization signal block (SSB) transmission period, synchronization information or synchronization signal block subcarrier spacing, etc. or Indicates the domain.
  • the "SL synchronization information configuration information" may be carried on the physical layer sideline control information sent by UE-A, and there is an indication field explicitly, indicating the SL synchronization information configuration.
  • the indication field contained in the physical layer side line control information includes synchronization information or synchronization signal block identifier (SL SSID), synchronization information or synchronization signal block (SSB) transmission period, synchronization information or synchronization signal block subcarrier spacing. Equal fields or indicating fields.
  • Physical layer side row control information can be SCI, or 2nd stage SCI, or 1st stage SCI.
  • SL synchronization information sending instruction and the SL synchronization information configuration information in steps S1005 and S1006 may be sent separately, or optionally, may also be sent simultaneously in different indication fields in the same message, which is not limited in this application .
  • UE B sends second SL synchronization information.
  • the UE sends the second SL synchronization information according to the information in steps S1006 and S1007.
  • the second SL synchronization information sent by UE B may include SLSS and SL MIB, which are used for the synchronization between UE-C and UE-B.
  • the second SL synchronization information may include synchronization information of UE B or a synchronization signal block identifier (SL SSID), and the identification is used to indicate a synchronization source for UE C to synchronize
  • the synchronization source may be UE B B, or optionally, when the SL SSID used by UE B is the same as the SL SSID used by UE A, the synchronization source can also be UE A.
  • UE C will synchronize with the corresponding synchronization source based on the SL SSID
  • the synchronization source is UE A or UE B, which is not limited in this application.
  • the SL SSID sent by UE B may be directly indicated by UE A, or UE-B may select an SL SSID within the value range of the SL SSID sent by UE A.
  • UE-B can take the SL SSID of UE-A as its own SL SSID; Or UE-B selects its own SL SSID within the SL SSID range indicated by UE-A, which is not limited in this application.
  • UE C completes synchronization with UE B according to the received second SL synchronization information from UE B, so as to further complete synchronization with gNB or network or UE A, wherein, the process for UE C to complete synchronization may refer to the prior art.
  • the embodiments of the present application relate to a scenario in which the UE is located within the coverage of the network and can receive dedicated signaling from the network to send synchronization information.
  • UE A sends indication information and configuration information to UE B, so that UE B can Send SL synchronization information, so that UE B's subordinate node (terminal device) UE C can complete synchronization with UE B according to the synchronization information, and then can overcome the multi-hop node scenario, the node cannot send synchronization information without transmission resources, resulting in automatic synchronization.
  • the top-to-bottom synchronization process subordinate nodes cannot obtain synchronization information and become a communication blind spot.
  • the SL discovery process in NR is supplemented.
  • FIG. 11 shows a schematic diagram of a synchronization process in another sidelink according to an embodiment of the present application.
  • the scenario involved in the embodiments of this application is that when UE A is within the coverage of the gNB or the network, UE A is not configured through dedicated signaling, but can receive broadcasts from the gNB or the network within the coverage of the gNB or the network The synchronization process that occurs during SL discovery and SL communication when the threshold of .
  • Figure 11 shows a schematic diagram of a synchronization process in another sidelink according to an embodiment of the present application.
  • the scenario involved in the embodiments of this application is that when UE A is within the coverage of the gNB or the network, UE A is not configured through dedicated signaling, but can receive broadcasts from the gNB or the network within the coverage of the gNB or the network
  • the synchronization process that occurs during SL discovery and SL communication when the threshold of . As shown in Figure 11:
  • S1101 and S11011 are the same as S1001 and S1002 in FIG. 10 , and details are not repeated here in this embodiment of the present application.
  • UE A receives the first threshold broadcast by the gNB.
  • UE A receives the first threshold syncTxThreshIC broadcast by gNB, and when certain conditions are met (for example, the RSRP measurement result is lower than the value of the first threshold syncTxThreshIC), the UE sends synchronization information, and the SL synchronizes
  • the information can be SLSS, or SLSS and MasterInformationBlock-SL, and this step can refer to the prior art.
  • SL synchronization information when networkControlledSyncTx is not configured in the RRC configuration message received by UE-A from gNB, the first threshold syncTxThreshIC is configured, and when UE-A measures the RSRP measurement result of the reference cell When the value is lower than the first threshold syncTxThreshIC, UE-A sends SL synchronization information, where the SL synchronization information may include SLSS and SL MIB.
  • SL synchronization information also known as SL SSB, includes SLSS and SL MIB.
  • the process is similar to SL discovery, except that in the SL synchronization information sent by UE A, for LTE, the SL synchronization information can also be SLSS and MasterInformationBlock-SL-V2X.
  • Steps S1104-S1108 are the same as S1004-S1008 in FIG. 10, and are not repeated in this embodiment of the present application.
  • the embodiments of the present application relate to a scenario in which the UE is within the coverage of the network and can receive the threshold from the network.
  • UE A sends the indication information and configuration information to UE B, so that UE B can send SL synchronization information, It enables UE B's subordinate node UE C to complete synchronization with UE B according to the synchronization information, and then overcomes the multi-hop node scenario, where the node cannot send synchronization information without transmission resources, resulting in the top-down synchronization process. , the subordinate nodes cannot obtain synchronization information and become a communication blind spot.
  • the SL discovery process in NR is supplemented.
  • FIG. 12 shows a schematic diagram of a synchronization process in another sidelink according to an embodiment of the present application.
  • the scenario involved in the embodiments of this application is that when UE A is located outside the coverage of the gNB or network, UE A cannot be configured through dedicated signaling, nor can UE A receive the first message from the gNB or network within the coverage of the gNB or network. Threshold, but there is a preconfigured second threshold, the synchronization process that occurs during SL discovery and SL communication. As shown in Figure 12:
  • UE A determines to send SL synchronization information.
  • UE A has a pre-configured second threshold syncTxThreshOoC.
  • the UE sends synchronization information , the SL synchronization information may be SLSS, or may be SLSS and MasterInformationBlock-SL, for this step, reference may be made to the prior art.
  • UE-A when UE-A has a pre-configured indication field second threshold syncTxThreshOoC, and does not select a synchronization reference UE, or UE-A selects a synchronization reference UE (such as UE B When the S-RSRP measurement result of ) is lower than the second threshold syncTxThreshOoC, UE-A sends SL synchronization information.
  • the SL synchronization information may include SLSS and SL MIB.
  • SL synchronization information also known as SL SSB, includes SLSS and SL MIB.
  • the process is similar to the LTE process in the SL discovery scenario, the difference is that the SL synchronization information can also be SLSS and MasterInformationBlock-SL-V2X.
  • UE-A when UE-A selects GNSS as the reference synchronization source, UE-A sends SL synchronization information.
  • UE B receives fifth SL synchronization information from UE A.
  • the SL synchronization information may include SLSS and SL MIB, which are used for the synchronization between UE-B and UE-A.
  • Steps S1203-S1205 are similar to S1005-S1007 in FIG. 10, and are not repeated in this embodiment of the present application.
  • UE C completes synchronization with UE B, thereby further completing synchronization with UE A, wherein, the process for UE C to complete synchronization may refer to the prior art.
  • the embodiments of the present application relate to a scenario in which the UE is located outside the network coverage and has a pre-configured threshold.
  • UE A sends the indication information and configuration information to UE B, so that UE B can send SL synchronization information, It enables UE B's subordinate node UE C to complete synchronization with UE B according to the synchronization information, and then overcomes the multi-hop node scenario, where the node cannot send synchronization information without transmission resources, resulting in the top-down synchronization process. , the subordinate nodes cannot obtain synchronization information and become a communication blind spot.
  • the SL discovery process in NR is supplemented.
  • FIG. 13 shows a schematic diagram of a communication apparatus according to an embodiment of the present application.
  • the apparatus 1300 includes a first sending module 1310 .
  • the apparatus 1300 may be configured to implement the function of sending a message of the first terminal device involved in any of the foregoing method embodiments.
  • the apparatus 1300 may be the first terminal device.
  • the apparatus 1300 includes a unit for implementing any step or operation in the foregoing method embodiments, the unit may be implemented by hardware, may be implemented by software, or may be implemented by combining hardware with software accomplish.
  • the apparatus 1300 may process the message as the first terminal device, and execute the steps of sending the message by the first terminal device in the above method embodiments.
  • the first sending module 1310 can be used to support the apparatus 1300 to perform communication, for example, to perform the sending actions performed by the first terminal device in FIG.
  • the processing actions in the above method for example, execute the processing actions performed by the first terminal device in FIGS. 8 to 9 .
  • the first sending module 1310 is configured to send first information through the side link, where the first information is used to instruct the second terminal device to send synchronization information; the first sending module 1310 is further configured to: through the side link The link sends second information, where the second information is used to indicate a first transmission resource, and the first transmission resource is used to carry the synchronization information.
  • the second information includes information about the period of the first transmission resource and/or information about the subcarrier spacing of the first transmission resource.
  • the first sending module is further configured to: send third information through the sidelink, where the third information is used to indicate the first part of the synchronization information sent by the second terminal device identifier, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • the first information is carried in sideline control information
  • the sideline control information includes any one of the following information: radio resource control RRC layer sideline control information, medium access control MAC layer sideline control information , Physical layer sideline control information.
  • the second information is carried in sideline control information
  • the sideline control information includes any one of the following information: radio resource control RRC layer sideline control information, medium access control MAC layer sideline control information , Physical layer sideline control information.
  • the third information is carried in sideline control information
  • the sideline control information includes any one of the following information: radio resource control RRC layer sideline control information, medium access control MAC layer sideline control information , Physical layer sideline control information.
  • the first sending module is specifically configured to: send the first information on a second transmission resource through the sidelink, wherein the second transmission resource is used by the first terminal device indicates, or, the second transmission resource is indicated by the network device.
  • the first sending module is specifically configured to: send the second information on a third transmission resource through the sidelink, wherein the third transmission resource is used by the first terminal device indicates, or, the third transmission resource is indicated by the network device.
  • the first sending module is specifically configured to: send the third information on a fourth transmission resource through the sidelink, wherein the fourth transmission resource is used by the first terminal device indicates, or, the fourth transmission resource is indicated by the network device.
  • the apparatus further includes: a processing module configured to configure the first transmission resource according to an instruction of a network device.
  • FIG. 14 shows a schematic diagram of another communication apparatus according to an embodiment of the present application.
  • the apparatus 1400 includes a second receiving module 1410 and a second sending module 1420 .
  • the apparatus 1400 may be used to implement the functions of receiving and sending messages of the second terminal device involved in any of the foregoing method embodiments.
  • the apparatus 1400 may be a second terminal device.
  • the apparatus 1400 includes a unit for implementing any step or operation in the foregoing method embodiments, and the unit may be implemented by hardware, software, or hardware combined with software. accomplish.
  • the apparatus 1400 may process the message as the second terminal device, and execute the steps of processing the indication message by the second terminal device in the foregoing method embodiments.
  • the second receiving module 1410 and the second sending module 1420 may be used to support the apparatus 1400 to communicate, for example, to perform the receiving and sending actions performed by the second terminal device in FIGS. 8 to 9 . Specifically, refer to the following description:
  • the second receiving module 1410 is configured to receive first information through the sidelink, where the first information is used to instruct the device to send synchronization information; the second receiving module 1410 is further configured to: through the sidelink The second information is used to indicate the first transmission resource, and the first transmission resource is used to carry the synchronization information; the second sending module 1420 is used for according to the first information and the second information. information, and send the synchronization information.
  • the second information includes information about the period of the first transmission resource and/or information about the subcarrier spacing of the first transmission resource.
  • the second receiving module is further configured to: receive third information through the sidelink, where the third information is used to indicate the first part of the synchronization information sent by the second terminal device identifier, where the first identifier is used to indicate the synchronization source of the synchronization process.
  • FIG. 15 shows a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • the communication apparatus 1500 may be used to implement the method related to the first terminal device described in the above method embodiments.
  • the communication device 1500 may be a chip.
  • the communication device 1500 includes one or more processors 1501 that can support the communication device 1500 to implement the communication methods in FIGS. 8 to 9 .
  • the processor 1501 may be a general purpose processor or a special purpose processor.
  • the processor 1501 may be a central processing unit (CPU) or a baseband processor.
  • the baseband processor may be used to process communication data, and the CPU may be used to control communication devices (eg, network equipment, terminal equipment, or chips), execute software programs, and process data of software programs.
  • the communication device 1500 may further include a transceiving unit 1505 for implementing signal input (reception) and output (transmission).
  • the communication device 1500 may be a chip, and the transceiver unit 1505 may be an input and/or output circuit of the chip, or the transceiver unit 1505 may be a communication interface of the chip, and the chip may serve as a terminal device or a network device or other wireless communication components of the device.
  • the communication device 1500 may include one or more memories 1502 on which a program 1504 is stored.
  • the program 1504 can be executed by the processor 1501 to generate instructions 1503, so that the processor 1501 executes the methods described in the above method embodiments according to the instructions 1503.
  • data may also be stored in the memory 1502 .
  • the processor 1501 may also read data stored in the memory 1502 , the data may be stored at the same storage address as the program 1504 , or the data may be stored at a different storage address from the program 1504 .
  • the processor 1501 and the memory 1502 may be provided separately or integrated together, for example, integrated on a single board or a system on chip (system on chip, SOC).
  • SOC system on chip
  • the communication device 1500 may further include a transceiver unit 1505 and an antenna 1506 .
  • the transceiver unit 1505 may be called a transceiver, a transceiver circuit or a transceiver, and is used to implement the transceiver function of the communication device through the antenna 1506 .
  • the steps of the above method embodiments may be implemented by logic circuits in the form of hardware or instructions in the form of software in the processor 1501 .
  • the processor 1501 may be a CPU, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices , for example, discrete gates, transistor logic devices, or discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • FIG. 16 shows another schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • the communication apparatus 1600 may be used to implement the method for the second terminal device described in the above method embodiments.
  • the communication device 1600 may be a chip.
  • the communication device 1600 includes one or more processors 1601 that can support the communication device 1600 to implement the communication methods in FIGS. 8 to 9 .
  • the processor 1601 may be a general purpose processor or a special purpose processor.
  • the processor 1601 may be a central processing unit (CPU) or a baseband processor.
  • the baseband processor may be used to process communication data, and the CPU may be used to control communication devices (eg, network equipment, terminal equipment, or chips), execute software programs, and process data of software programs.
  • the communication device 1600 may further include a transceiving unit 1605 for implementing signal input (reception) and output (transmission).
  • the communication device 1600 may be a chip, and the transceiver unit 1605 may be an input and/or output circuit of the chip, or the transceiver unit 1605 may be a communication interface of the chip, and the chip may serve as a terminal device or a network device or other wireless communication components of the device.
  • the communication device 1600 may include one or more memories 1602 on which a program 1604 is stored.
  • the program 1604 can be executed by the processor 1601 to generate instructions 1603, so that the processor 1601 executes the methods described in the above method embodiments according to the instructions 1603.
  • data may also be stored in the memory 1602 .
  • the processor 1601 may also read data stored in the memory 1602 , the data may be stored at the same storage address as the program 1604 , or the data may be stored at a different storage address from the program 1604 .
  • the processor 1601 and the memory 1602 can be provided separately, or can be integrated together, for example, integrated on a single board or a system on chip (system on chip, SOC).
  • SOC system on chip
  • the communication device 1600 may further include a transceiver unit 1605 and an antenna 1606 .
  • the transceiver unit 1605 may be referred to as a transceiver, a transceiver circuit or a transceiver, and is used to implement the transceiver function of the communication device through the antenna 1606 .
  • the steps in the above method embodiments may be implemented by logic circuits in the form of hardware or instructions in the form of software in the processor 1601 .
  • the processor 1601 may be a CPU, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices , for example, discrete gates, transistor logic devices, or discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

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

Abstract

La présente invention concerne un procédé de communication. Ledit procédé comprend : l'envoi, par un premier dispositif de terminal, de premières informations au moyen d'une liaison latérale, les premières informations étant utilisées pour donner l'ordre à un second dispositif de terminal d'envoyer des informations de synchronisation ; et l'envoi, par le premier dispositif de terminal, de secondes informations au moyen de la liaison latérale, les secondes informations étant utilisées pour indiquer une première ressource de transmission, et la première ressource de transmission étant utilisée pour transporter les informations de synchronisation. Dans la présente demande, des informations d'indication et des informations de configuration sont envoyées à un UE pour lequel aucune ressource de transmission n'est disponible, de sorte que l'UE peut envoyer les informations de synchronisation selon l'indication, et un nœud subordonné (un dispositif de terminal) de l'UE peut réaliser une synchronisation avec l'UE ou avec un réseau selon les informations de synchronisation, ce qui résout le problème selon lequel, dans un scénario de nœuds à multiples bonds, un nœud n'a pas de ressource de transmission et ne peut pas envoyer des informations de synchronisation, ce qui provoque que, dans un processus de synchronisation niveau par niveau, un nœud subordonné ne peut pas acquérir les informations de synchronisation et devient un point de communication aveugle. De plus, la présente demande concerne un processus de découverte de liaison latérale dans un environnement NR.
PCT/CN2020/116504 2020-09-21 2020-09-21 Procédé de communication et appareil de communication WO2022056909A1 (fr)

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