WO2020001330A1 - 通信方法、设备和系统 - Google Patents

通信方法、设备和系统 Download PDF

Info

Publication number
WO2020001330A1
WO2020001330A1 PCT/CN2019/091757 CN2019091757W WO2020001330A1 WO 2020001330 A1 WO2020001330 A1 WO 2020001330A1 CN 2019091757 W CN2019091757 W CN 2019091757W WO 2020001330 A1 WO2020001330 A1 WO 2020001330A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal device
message
timing advance
advance value
group
Prior art date
Application number
PCT/CN2019/091757
Other languages
English (en)
French (fr)
Inventor
袁璞
向铮铮
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19825403.9A priority Critical patent/EP3813390A4/en
Publication of WO2020001330A1 publication Critical patent/WO2020001330A1/zh
Priority to US17/132,605 priority patent/US20210120375A1/en

Links

Images

Classifications

    • 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
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time

Definitions

  • the present application relates to the field of communications, and in particular, to a communication method, device, and system.
  • the base station In a long term evolution (LTE) system, in order to maintain uplink synchronization, the base station requires that the signals from different user equipments (user equipment) of different frequency domain resources in the same subframe arrive at the base station basically aligned. In order to facilitate the base station to correctly decode the uplink data sent by the UE. In order to ensure timing synchronization at the base station side, related technologies have proposed a timing advance (TA) mechanism.
  • the base station instructs each UE of the TA of the UE relative to the base station to control the time when uplink signals from different UEs arrive at the base station. For example, for a UE that is far from the base station, the transmission delay is large, and it is necessary to send uplink data in advance than a UE that is closer to the base station.
  • TA may be a parameter used to characterize the timing deviation of the data received by the base station from the UE.
  • timing synchronization needs to be implemented in some other communication systems in the future, but the industry has no relevant definition for this.
  • V2V vehicle-to-vehicle
  • the present application provides a communication method, terminal device and system, which can improve communication efficiency.
  • a communication method including: a first terminal device sends a first message to a second terminal device, where the first message is used to establish a multicast group, and the multicast group includes the first terminal The device and the second terminal device; the first terminal device receives a second message from the second terminal device, the second message is used to confirm that the second terminal device belongs to the multicast group; the The first terminal device obtains a first timing advance value of the second terminal device relative to the first terminal device according to the first message and the second message; the first terminal device sends the second terminal device to the second terminal device; The terminal device sends a third message, where the third message includes the first timing advance value.
  • the functions of the first message and the second message are multiplexed, so that the timing synchronization is also achieved at the stage of establishing a multicast group, thereby saving signaling and The purpose of improving communication efficiency.
  • the first message is a detectable sequence signal.
  • the first message is a sequence signal that can be detected, so that the second terminal device can detect the first message and reply to the second message after detecting the first message, so that according to The first message and the second message acquire the first timing advance value, and multiplex the functions of the first message and the second message, thereby realizing timing synchronization at the same time when the multicast group is established, and saving signaling and The purpose of improving communication efficiency.
  • the detectable sequence signal is a pseudo-random sequence signal.
  • the first message is a pseudo-random sequence signal, so that a second terminal device can detect the first message and reply to the second message after detecting the first message, so that according to the The first message and the second message acquire the first timing advance value, and multiplex the functions of the first message and the second message, thereby realizing timing synchronization at the same time as the stage of establishing a multicast group, thereby saving signaling and improving communication The purpose of efficiency.
  • the first terminal device acquires a first timing advance value of the second terminal device relative to the first terminal device according to the first message and the second message
  • the method includes: obtaining, by the first terminal device, the first timing advance value according to a sending time of the first message and a receiving time of the second message.
  • the multicast group further includes a third terminal device, and further includes: the first terminal device receives an intra-group synchronization signal sent by the third terminal device; the first terminal device Sending a feedback confirmation message to the third terminal device, where the feedback confirmation message is used to respond to the synchronization signal within the group; the first terminal device receives a fourth message sent by the third terminal device, and the fourth The message includes a second timing advance value, the second timing advance value is a timing advance value of the first terminal device relative to the third terminal device, and the second timing advance value is the third terminal device according to The synchronization signal in the group and the feedback confirmation message are acquired.
  • the first terminal device may receive the intra-group synchronization signal sent by the third terminal device in the multicast group, so as to obtain the first terminal device from the third terminal device with respect to A second timing advance value of the third terminal device.
  • a timing synchronization mechanism in a multicast mechanism is provided, and communication efficiency is improved.
  • the third message further includes an identifier of the second terminal device.
  • the first message includes a group identifier of the multicast group.
  • the second message includes an identifier of the second terminal device and the group identifier.
  • the first terminal device and the second terminal device are vehicle-mounted devices.
  • a communication method including: a second terminal device receives a first message from a first terminal device, the first message is used to establish a multicast group, and the multicast group includes the first terminal The device and the second terminal device; the second terminal device sends a second message to the first terminal device, the second message is used to confirm that the second terminal device belongs to the multicast group; the The second terminal device receives a third message from the first terminal device, the third message includes a first timing advance value, and the first timing advance value is the second terminal device relative to the first terminal device A timing advance value of the first timing advance value obtained by the first terminal device according to the first message and the second message.
  • the functions of the first message and the second message are multiplexed, so that the timing synchronization is also achieved at the stage of establishing a multicast group, which saves signaling and The purpose of improving communication efficiency.
  • the first message is a detectable sequence signal.
  • the first message is a sequence signal that can be detected, so that the second terminal device can detect the first message and reply to the second message after detecting the first message, so that according to The first message and the second message acquire the first timing advance value, and multiplex the functions of the first message and the second message, thereby realizing timing synchronization at the same time when the multicast group is established, and saving signaling and The purpose of improving communication efficiency.
  • the detectable sequence signal is a pseudo-random sequence signal.
  • the first message is a pseudo-random sequence signal, so that a second terminal device can detect the first message and reply to the second message after detecting the first message, so that according to the The first message and the second message acquire the first timing advance value, and multiplex the functions of the first message and the second message, thereby realizing timing synchronization at the same time as the stage of establishing a multicast group, thereby saving signaling and improving communication The purpose of efficiency.
  • the first message includes a group identifier of the multicast group.
  • the second message includes an identifier of the second terminal device and the group identifier.
  • the method further includes that the second terminal device sends an intra-group synchronization signal to a fourth terminal device.
  • the multicast group further includes the fourth terminal device; the second terminal device receives a feedback confirmation message from the fourth terminal device, and the feedback confirmation message is used to respond to the intra-group synchronization signal;
  • the second terminal device obtains a third timing advance value of the fourth terminal device relative to the second terminal device according to the synchronization signal in the group and the feedback confirmation message;
  • Four terminal devices send a fifth message, where the fifth message includes the third timing advance value.
  • the second terminal device may send an intra-group synchronization signal to other terminal devices in the multicast group to obtain a third terminal device of the other terminal device relative to the second terminal device.
  • Timing advance value is indicated to other terminal devices.
  • the second terminal device obtains a third timing advance value of the fourth terminal device relative to the second terminal device according to the intra-group synchronization signal and the feedback confirmation message. Including: obtaining, by the second terminal device, the third timing advance value according to a sending time of the synchronization signal in the group and a receiving time of the feedback confirmation message.
  • the intra-group synchronization signal includes the group identifier and the identifier of the second terminal device.
  • the fifth message further includes an identifier of the fourth terminal device.
  • the method further includes: obtaining, by the second terminal device, the second terminal device relative to the fifth terminal device according to a first distance, a second distance, and the first timing advance value.
  • the fourth timing advance value wherein the first distance is a first distance between the second terminal device and the first terminal device, and the second distance is the second terminal device and the fifth terminal The second distance between the devices.
  • the first terminal device and the second terminal device are vehicle-mounted devices.
  • a terminal device is provided, and the terminal device is configured to execute the foregoing first aspect or the method in any possible implementation manner of the first aspect.
  • the terminal device includes a unit for performing the foregoing first aspect or the method in any possible implementation manner of the first aspect.
  • a terminal device is provided, and the terminal device is configured to execute the second aspect or the method in any possible implementation manner of the second aspect.
  • the terminal device includes a unit for performing the foregoing second aspect or the method in any possible implementation manner of the second aspect.
  • a terminal device includes a communication interface, a memory, and a processor.
  • the memory is used to store instructions
  • the processor is used to execute the instructions stored in the memory to control the communication interface to receive signals and / or send signals, and when the processor executes the instructions stored in the memory, the execution causes the The processor executes the first aspect or the method in any possible implementation of the first aspect.
  • a terminal device includes a communication interface, a memory, and a processor.
  • the communication interface, the memory, and the processor are connected through the bus system.
  • the memory is used to store instructions.
  • the processor is used to execute the instructions stored in the memory to control the communication interface to receive signals and / or send signals.
  • the execution causes the processor to execute the method in the second aspect or any possible implementation manner of the second aspect.
  • a communication system including the terminal devices of the third and fourth aspects described above, or the terminal devices of the fifth and sixth aspects described above.
  • a computer-readable medium for storing a computer program, the computer program including instructions for performing the first aspect or the method in any possible implementation of the first aspect.
  • a computer-readable medium for storing a computer program including instructions for performing the second aspect or the method in any possible implementation of the second aspect.
  • FIG. 1 is a schematic diagram of a possible application scenario according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a possible application scenario of another embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a possible application scenario of another embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a terminal device according to another embodiment of the present application.
  • GSM global mobile communication
  • CDMA code division multiple access
  • CDMA wideband code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD LTE frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile communication system
  • WiMAX global interconnected microwave access
  • 5G future generation
  • NR new radio
  • the terminal equipment in the embodiments of the present application may refer to vehicle-mounted equipment, vehicle-mounted terminal equipment, vehicle-mounted user equipment, vehicles, roadside units (RSU), user equipment, access terminals, user units, user stations, mobile stations, Mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device.
  • the terminal device may also be a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (PLMN), which is not limited in the embodiments of the present application.
  • PLMN public land mobile network
  • the communication method in the embodiment of the present application may propose a multicast-oriented timing synchronization mechanism. This method can be applied to the scenarios shown in Figures 1 and 2 below or other similar scenarios for multicast.
  • FIGS. 1 and 2 are schematic diagrams of a possible application scenario according to an embodiment of the present application.
  • multiple terminal devices may be included, and the multiple terminal devices may form a terminal device set.
  • a plurality of communication methods may be adopted between the multiple terminal devices.
  • broadcast, unicast, or multicast can be used.
  • multicast can mean that multiple terminal devices form groups according to specific rules, and the form of multicast is limited to members in the group.
  • the above specific rule may be, for example, dividing a group according to a principle such as the same service or an adjacent cell.
  • the multiple terminal devices may be vehicle-mounted devices, vehicles, and the like.
  • the in-vehicle equipment set includes a leader 101, and the remaining in-vehicle equipment is called a member vehicle 102, and the member vehicle 102 needs to communicate through the leader vehicle 101.
  • the above-mentioned leader car may also be called a leader car, and the leader car may be an initiator of establishing a multicast group.
  • This scenario may be, for example, a platooning scenario defined in NR-V2V.
  • the second case as shown in FIG.
  • each vehicle-mounted device in the vehicle-mounted device set has the same status, and the vehicle-mounted devices can be referred to as member vehicles 102, and the member vehicles 102 can communicate freely.
  • the second scenario timing synchronization between each member car 102 and any other member car 102 needs to be achieved.
  • FIG. 3 is a schematic flowchart of a communication method 300 according to an embodiment of the present application. As shown in FIG. 3, the method 300 includes:
  • the first terminal device sends a first message to the second terminal device.
  • the second terminal device receives the first message, where the first message is used to establish a multicast group, and the multicast group includes the multicast group.
  • the first message may be a group establishment message or a group establishment request message.
  • the first terminal device and the second terminal device may be a vehicle-mounted device, a vehicle, a vehicle-mounted user equipment, a roadside unit (RSU), a user equipment, an access terminal, a user unit, a user station, Mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device.
  • the terminal device may also be a terminal device in a future 5G network or a terminal device in a public land mobile network (PLMN) in the future, which is not limited in the embodiments of the present application.
  • PLMN public land mobile network
  • the first message is a detectable sequence signal.
  • it can be a binary sequence.
  • the first message may be a pseudo-random sequence.
  • the first message may be another form of signal, as long as other terminal devices can detect the first message.
  • the first terminal device may be the leader car 101 in FIG. 1, and the second terminal device may be any member car 102 in FIG. 1.
  • the first terminal device may also be any member vehicle 102 in FIG. 2, and the foregoing first terminal device may be referred to as a member vehicle that initiates group establishment.
  • the above-mentioned second terminal device may be a member car 102 other than the member car 102 that initiated the group formation.
  • the first message may include a group identifier (ID) of the multicast group, so that the remaining terminal devices in the multicast group can identify the group identifier.
  • ID group identifier
  • the group identifier may be a group identifier allocated according to different service types.
  • the terminal equipment may be assigned a group identifier in advance by the base station.
  • Different service types can correspond to different group identifiers.
  • the first terminal device receives a second message from the second terminal device. Accordingly, the second terminal device sends the second message to the first terminal device.
  • the second message is used for: And confirming that the second terminal device belongs to the multicast group.
  • the second message may be a group establishment confirmation message.
  • the second message may be an acknowledgement (ACK) signal. Or it can be other types of signals.
  • ACK acknowledgement
  • the second message may include the group identifier and the identifier of the second terminal device.
  • the group identifier may be indicated in an explicit manner or in an implicit manner.
  • the second message may be scrambled with the group identity.
  • the identifier of the second terminal device may be an identifier allocated by the cell to the second terminal device. For example, it may be a cell wireless network temporary identifier (C-RNTI).
  • the first terminal device obtains a first timing advance value of the second terminal device relative to the first terminal device according to the first message and the second message.
  • the first timing advance value refers to a timing advance value of the second terminal device relative to the first terminal device.
  • the second terminal device is a transmitting end, and the first terminal device is a receiving end.
  • the timing advance value is a parameter used to indicate the timing deviation of the data sent by the sender to the receiver. In other words, the time offset of the second terminal device sending data to the first terminal device. For example, if the offset indicated by the timing advance value is 1 microsecond ( ⁇ s), the second terminal device needs to send a signal to the first terminal device 1 ⁇ s in advance.
  • the first terminal device may obtain the first timing advance value of the second terminal device with respect to the first terminal device in multiple ways.
  • the first terminal device may obtain the first timing advance value according to a sending time of the first message and a receiving time of the second message. For example, assuming that the sending time of the first message is T1 and the receiving time of the second message is T2, the first terminal device may determine that the first timing advance value is (T2-T1) / 2.
  • the first terminal device sends a third message to the second terminal device, where the third message includes the first timing advance value.
  • the third message may further carry an identifier of the second terminal device.
  • the identifier of the second terminal device is used to indicate that the first timing advance value corresponds to the second terminal device.
  • the second terminal device may send data to the first terminal device according to the first timing advance value, so that the first terminal device can receive normally And decode the data sent by the second terminal device.
  • the functions of the first message and the second message are multiplexed, so that the timing synchronization is also achieved at the stage of establishing a multicast group, which saves signaling and The purpose of improving communication efficiency.
  • the first message is a sequence signal that can be detected, so that the second terminal device can detect the first message and reply to the second message after detecting the first message, so that according to The first message and the second message acquire the first timing advance value, and multiplex the functions of the first message and the second message, thereby realizing timing synchronization at the same time when the multicast group is established, and saving signaling and The purpose of improving communication efficiency.
  • the first terminal device may be a member car that initiates group formation in FIG. 2. Therefore, when the first terminal device sends data to other terminal devices, it is also necessary to obtain a timing advance value of the first terminal device relative to the other terminal devices.
  • the method 300 further includes: the first terminal device receives an intra-group synchronization signal sent by the third terminal device; the first terminal device sends the third terminal device to the third terminal The device sends a feedback confirmation message, which is used to respond to the synchronization signal in the group; the first terminal device receives a fourth message sent by the third terminal device, and the fourth message includes a second timing advance Value, the second timing advance value is a timing advance value of the first terminal device relative to the third terminal device, and the second timing advance value is the third terminal device according to the intra-group synchronization signal And the feedback confirmation message is obtained.
  • the second timing advance value may be obtained according to a sending time of the synchronization signal in the group and a receiving time of the feedback confirmation message.
  • the first terminal device may receive the intra-group synchronization signal sent by the third terminal device in the multicast group, so as to obtain the first terminal device from the third terminal device with respect to A second timing advance value of the third terminal device.
  • a timing synchronization mechanism in a multicast mechanism is provided, and communication efficiency is improved.
  • the intra-group synchronization signal may be a detectable sequence signal.
  • binary sequence signals Or it could be a pseudo-random sequence signal. Or it can be other types of signals.
  • the intra-group synchronization signal is a detectable sequence signal, so that the second terminal device can detect the intra-group synchronization signal, and return a feedback confirmation message after detecting the intra-group synchronization signal. Therefore, the second timing advance value is obtained according to the synchronization signal and the feedback confirmation message in the group, thereby providing an effective timing synchronization method for the multicast mechanism.
  • the second timing advance value refers to a timing advance value of the first terminal device relative to the third terminal device.
  • the time offset of the time when the first terminal device sends data to the third terminal device For example, if the offset indicated by the timing advance value is 1 microsecond ( ⁇ s), the first terminal device needs to send a signal to the third terminal device 1 ⁇ s in advance.
  • the first terminal device may send data to the third terminal device according to the second timing advance value.
  • the first terminal device may be any member vehicle in FIG. 2, and the third terminal device may be any terminal device in the multicast group except the first terminal device.
  • the method 300 further includes: the second terminal device sends an intra-group synchronization signal to the fourth terminal device, and the multicast group further includes the fourth terminal device, and accordingly, the A fourth terminal device receives the intra-group synchronization signal; the fourth terminal device sends a feedback confirmation message to the second terminal device, and accordingly, the second terminal device receives a feedback confirmation message from the fourth terminal device
  • the feedback confirmation message is used to respond to the intra-group synchronization signal; and the second terminal device acquires the fourth terminal device relative to the second terminal according to the intra-group synchronization signal and the feedback confirmation message.
  • a third timing advance value of the device the second terminal device sends the third timing advance value to the fourth terminal device.
  • the intra-group synchronization signal may be a detectable sequence signal.
  • a binary sequence signal Or it could be a pseudo-random sequence signal. Or it can be other types of signals.
  • the third timing advance value refers to a timing advance value of the fourth terminal device relative to the second terminal device.
  • the time offset of the fourth terminal device sending data to the second terminal device For example, if the offset indicated by the timing advance value is 1 microsecond ( ⁇ s), the fourth terminal device needs to send a signal to the second terminal device 1 ⁇ s in advance.
  • the second terminal device may send an intra-group synchronization signal to other terminal devices in the multicast group to obtain a third terminal device of the other terminal device relative to the second terminal device Timing advance value.
  • the third timing advance value is indicated to other terminal devices.
  • the obtaining, by the second terminal device, a third timing advance value of the fourth terminal device relative to the second terminal device according to the synchronization signal in the group and the feedback confirmation message includes: The second terminal device acquires the third timing advance value according to a sending time of the synchronization signal in the group and a receiving time of the feedback confirmation message.
  • the intra-group synchronization signal may include the group identity and the identity of the second terminal device.
  • the group identification may be indicated in an explicit or implicit manner.
  • the group identification may be used to scramble the synchronization signals within the group.
  • the sending, by the second terminal device, the third timing advance value to the fourth terminal device includes: the second terminal device sends a second message to the fourth terminal device, and the first The two messages include the third timing advance value and an identifier of the fourth terminal device. The identifier of the fourth terminal device corresponds to the third timing advance value.
  • the multicast group further includes a fifth terminal device.
  • the method further includes: obtaining, by the second terminal device, a fourth timing advance value of the second terminal device relative to the fifth terminal device according to the first distance, the second distance, and the first timing advance value , Wherein the first distance is a first distance between the second terminal device and the first terminal device, and the second distance is a second distance between the second terminal device and a fifth terminal device distance.
  • the fifth terminal device may be any member car in the multicast group except the second terminal device.
  • the second terminal device may determine the fourth timing advance value between the second terminal device and the fifth terminal device by itself based on the first timing advance value and the distance between the terminal devices, so as to facilitate the calculation according to the second terminal device. Sending data to the fifth terminal device according to the fourth timing advance value.
  • the timing advance value is proportional to the distance, that is, the closer the distance, the smaller the timing advance value, and the longer the distance, the larger the timing advance value.
  • FIG. 4 is a schematic diagram of an application environment in another embodiment of the present application.
  • the timing advance value between the second terminal device 402 and the first terminal device 401 is TA1
  • the third terminal device 403 is relative to the first
  • the timing advance value between the terminal devices 401 is TA2
  • the first terminal device 401 may send a broadcast message to all other terminal devices.
  • the broadcast message includes the identifiers of the terminal devices in all multicast groups and the timing advance value of other terminal devices relative to the first terminal device 401.
  • other terminal devices receive the message, they obtain their own timing advance values with respect to the first terminal device 401, and also obtain the timing advance values of other terminal devices with respect to the first terminal device 401.
  • the timing advance value TA1 of the second terminal device 402 relative to the first terminal device 401 and the timing advance value TA2 of the third terminal device relative to the first terminal device 401.
  • FIG. 5 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • the terminal device is a vehicle
  • the multicast group includes one leader vehicle and multiple member vehicles. Therefore, member cars need to communicate through the leader car.
  • the leader car initiates the formation process and completes the timing synchronization between the member car and the leader car during the formation process.
  • the method of FIG. 5 includes:
  • the leader car sends a first message, where the first message is used to establish a multicast group, and accordingly, the member car receives the first message.
  • the first message is a sequence signal that can be detected.
  • the first message may be used to indicate the group identity of the multicast group.
  • the member car detects the first message and sends a second message to the leader car. Accordingly, the lead vehicle receives the second message.
  • the second message may be scrambled by a group identifier.
  • the above-mentioned second message may indicate the identity of the member car.
  • the leader car obtains a timing advance value of the member car relative to the leader car according to the first message and the second message.
  • the leader car sends a third message to the member car, where the third message is used to indicate an identity of the member car and a corresponding timing advance value.
  • the process of establishing a group and timing synchronization is implemented simultaneously by multiplexing the first message and the second message.
  • the leader car obtains the identity of the member car, and the member car obtains the timing advance value of the member car relative to the leader car. Therefore, by designing the corresponding formation and synchronization process, the signaling overhead is reduced, the delay is reduced, and the communication efficiency is improved.
  • FIG. 6 is a schematic flowchart of a communication method according to another embodiment of the present application.
  • the terminal device is a vehicle.
  • the multicast group includes multiple member cars, and the member cars in the multicast group can communicate freely.
  • the member cars in the group can be in any position, and any member car can initiate a group.
  • the method of FIG. 6 includes:
  • a first member car sends a first message, where the first message is used to establish a multicast group. Accordingly, a second member car in the multicast group receives the first message.
  • the first message may be a group establishment message or a group establishment request message.
  • the first message is a sequence signal that can be detected.
  • the first message may be used to indicate the group identity of the multicast group.
  • the first member vehicle is a member vehicle that initiates a group establishment process.
  • the first member car may be any member car in the multicast group.
  • the second member car may be any member car except the member car in the multicast group.
  • the second member car detects the first message and sends a second message to the first member car. Accordingly, the first member car receives the second message.
  • the second message may be a group establishment confirmation message.
  • the second message may be scrambled with a group identifier, and the second message may also be used to indicate the identifier of the second member car.
  • the second message includes the identifier of the second member car.
  • the first member car obtains a first timing advance value of the second member car relative to the first member car according to the first message and the second message.
  • the first member car sends the first timing advance value to the second member car.
  • the first member car may send a third message to the second member car, and the third message includes the identifier of the second member car and the first timing advance value corresponding to the identifier.
  • the second member car may send an intra-group synchronization signal to the third member car. Accordingly, the third member car receives the intra-group synchronization signal.
  • the third member car may be any member car except the second member car in the multicast group.
  • the intra-group synchronization signal is a detectable sequence signal, such as a pseudo-random sequence signal.
  • the intra-group synchronization signal may include a group identification and an identification of the second member car.
  • the third member car may send a feedback confirmation message to the second member car. Accordingly, the third member car receives the feedback confirmation message.
  • the third member vehicle may detect the synchronization signal in the group, and send a feedback confirmation message after detecting the synchronization signal in the group.
  • the feedback confirmation message may include a group identifier and an identifier of the third member car.
  • the second member car obtains a third timing advance value of the third member car relative to the second member car according to the feedback confirmation message.
  • the second member car sends the third timing advance value to the third member car. Accordingly, the third member car receives the third timing advance value.
  • the second member car may send a fifth message to the third member car, and the fifth message includes the identifier of the third member car and the third timing advance value.
  • the process of establishing a group and timing synchronization is implemented simultaneously by multiplexing the first message and the second message.
  • the member car may obtain timing advance values of other member cars relative to the member car. Therefore, by designing the corresponding formation and synchronization process, the signaling overhead is reduced and the delay is reduced.
  • FIG. 7 is a detailed flowchart of another embodiment of the present application.
  • the terminal device is a vehicle.
  • the multicast group includes multiple member cars, and the member cars in the multicast group can communicate freely.
  • the member cars in the group are driving sideways in the same road direction. Any member car can initiate the formation process.
  • the member vehicle traveling in the forefront is the member vehicle that initiated the formation of a group.
  • the member car may determine the timing advance value between the member car and other member cars according to the timing advance value between the member car and the member car that initiated the group formation.
  • the method of FIG. 7 includes:
  • the first member vehicle sends a first message, where the first message is used to establish a multicast group, and accordingly, the second member vehicle receives the first message.
  • the first message may be a group establishment message or a group establishment request message.
  • the first message is a sequence signal that can be detected.
  • the first message may be used to indicate the group identity of the multicast group.
  • the first member vehicle is a member vehicle that initiates a group establishment process.
  • the first member car may be any member car in the multicast group.
  • the second member car may be any member car except the member car in the multicast group.
  • the second member car detects the first message and sends a second message to the first member car. Accordingly, the first member car receives the second message.
  • the second message may be a group establishment message.
  • the second message may be scrambled with a group identifier, and the second message is further used to indicate an identifier of the second member car.
  • the second message includes the identifier of the second member car.
  • the first member car obtains a first timing advance value of the second member car relative to the first member car according to the first message and the second message.
  • the first member car sends the first timing advance value to the second member car.
  • the first member car may send a third message to the second member car, and the third message includes the identifier of the second member car and the first timing advance value corresponding to the identifier.
  • the second member car may, according to the first timing advance value and the first distance between the second member car and the first member car, A second distance between the cars determines a fourth timing advance value of the fourth member car relative to the second member car.
  • the first timing advance value is TA1
  • the fourth timing advance value is TA4
  • the first distance is d1
  • the second distance is d2.
  • TA4 (d2 / d1) * TA1.
  • the process of establishing a group and timing synchronization is implemented simultaneously by multiplexing the first message and the second message.
  • the member car may obtain a timing advance value relative to other member cars. Therefore, by designing the corresponding formation and synchronization process, the signaling overhead is reduced and the delay is reduced. And the member car can obtain the timing advance value of the member car relative to other member cars according to the distance between the member cars and the known timing advance value, which improves the efficiency of timing synchronization.
  • FIG. 8 is a schematic structural diagram of a terminal device 800 according to an embodiment of the present application. It should be understood that the terminal device 800 can perform each step performed by the first terminal device in the methods in FIG. 1 to FIG. 7. To avoid repetition, details are not described herein.
  • the terminal device 800 includes: a sending unit 810, a receiving unit 820, and a processing unit 830.
  • the sending unit 810 is configured to send a first message to a second terminal device, where the first message is used to establish a multicast group, where the multicast group includes the first terminal device and the second terminal device;
  • the receiving unit 820 is configured to receive a second message from the second terminal device, where the second message is used to confirm that the second terminal device belongs to the multicast group;
  • the processing unit 830 is configured to obtain a first timing advance value of the second terminal device relative to the first terminal device according to the first message and the second message;
  • the sending unit 810 is further configured to send a third message to the second terminal device, where the third message includes the first timing advance value.
  • the sending unit 810 may be replaced by a transmitter, a transceiver, or a communication interface
  • the receiving unit 820 may be replaced by a receiver, a transceiver, or a communication interface
  • the processing unit 830 may be replaced by a processor.
  • the functions of the receiver, the transmitter, or the communication interface may be considered to be implemented through a transceiver circuit or a dedicated chip for transceiver.
  • the processor may be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.
  • FIG. 9 is a schematic structural diagram of a terminal device 900 according to another embodiment of the present application. It should be understood that the terminal device 900 can perform each step performed by the second terminal device or the steps performed by other terminal devices in the methods in FIG. 1 to FIG. 7. To avoid repetition, details are not described herein.
  • the terminal device 900 includes: a receiving unit 910 and a sending unit 920,
  • the receiving unit 910 is configured to receive a first message from a first terminal device, where the first message is used to establish a multicast group, where the multicast group includes the first terminal device and the second terminal device;
  • the sending unit 920 is configured to send a second message to the first terminal device, where the second message is used to confirm that the second terminal device belongs to the multicast group;
  • the receiving unit 910 is configured to receive a third message from the first terminal device, where the third message includes a first timing advance value, where the first timing advance value is relative to the first terminal device A timing advance value of a terminal device, and the first timing advance value is obtained by the first terminal device according to the first message and the second message.
  • the receiving unit 910 may be replaced by a receiver, a transceiver, or a communication interface
  • the sending unit 920 may be replaced by a transmitter, a transceiver, or a communication interface.
  • the functions of the receiver, the transmitter, or the communication interface may be considered to be implemented through a transceiver circuit or a dedicated chip for transceiver.
  • FIG. 10 is a schematic block diagram of a terminal device 1000 according to an embodiment of the present application. It should be understood that the terminal device 1000 can perform each step performed by the first terminal device in the methods in FIG. 1 to FIG. 7. To avoid repetition, details are not described herein.
  • the terminal device 1000 includes:
  • a memory 1010 for storing a program
  • a communication interface 1020 for communicating with other devices
  • the processor 1030 is configured to execute a program in the memory 1010. When the program is executed, the processor 1030 is configured to send a first message to a second terminal device through the communication interface 1020.
  • the first message is used for For establishing a multicast group, the multicast group includes the first terminal device and a second terminal device; and receiving a second message from the second terminal device through the communication interface, and the second message is used for confirmation
  • the second terminal device belongs to the multicast group; and acquiring a first timing advance value of the second terminal device relative to the first terminal device according to the first message and the second message; and Sending a third message to the second terminal device through the communication interface, where the third message includes the first timing advance value.
  • the terminal device shown in FIG. 10 may be a vehicle-mounted device, or may be a chip or a circuit, or other types of terminal devices.
  • a chip or a circuit that can be provided in a vehicle-mounted device.
  • the above-mentioned communication interface 1020 may be interchanged with a transceiver.
  • the transceiver includes a receiver and a transmitter.
  • the terminal device 1000 may further include a bus system.
  • the processor 1030, the memory 1010, the receiver, and the transmitter are connected through a bus system.
  • the processor 1030 is configured to execute instructions stored in the memory 1010 to control the receiver to receive signals and control the transmitter to send signals to complete the communication of this application.
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the memory 1010 may be integrated in the processor 1030 or may be separately provided from the processor 1030.
  • the functions of the receiver and the transmitter may be considered to be implemented by a transceiver circuit or a transceiver chip.
  • the processor 1030 may be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.
  • a manner of using a general-purpose computer may be considered to implement the network device provided in the embodiment of the present application.
  • the program code for the functions of the processor 1030 and the receiver and the transmitter is to be stored in the memory, and the general-purpose processor implements the functions of the processor 1030, the receiver, and the transmitter by executing the codes in the memory.
  • FIG. 11 is a schematic block diagram of a terminal device 1100 according to an embodiment of the present application. It should be understood that the terminal device 1100 can perform each step performed by the second terminal device in the methods in FIG. 1 to FIG. 7. To avoid repetition, details are not described herein.
  • the terminal device 1100 includes:
  • a memory 1110 for storing a program
  • the processor 1130 is configured to execute a program in the memory 1110. When the program is executed, the processor 1130 is configured to receive a first message from a first terminal device through the communication interface 1120, and the first message is used for For establishing a multicast group, the multicast group includes the first terminal device and the second terminal device; a second message is sent to the first terminal device through the communication interface 1120, and the second message is used for For confirming that the second terminal device belongs to the multicast group; receiving a third message from the first terminal device through the communication interface 1120, where the third message includes a first timing advance value, and the first timing The advance value is a timing advance value of the second terminal device relative to the first terminal device, and the first timing advance value is obtained by the first terminal device according to the first message and the second message. .
  • the terminal device shown in FIG. 11 may be a vehicle-mounted device, a chip or a circuit, or another type of terminal device.
  • a chip or a circuit that can be provided in a vehicle-mounted device may be interchanged with a transceiver.
  • the transceiver includes a receiver and a transmitter.
  • the terminal device 1100 may further include a bus system.
  • the processor 1130, the memory 1110, the receiver, and the transmitter are connected through a bus system.
  • the processor 1130 is configured to execute instructions stored in the memory 1110 to control the receiver to receive signals and control the transmitter to send signals to complete the communication of this application.
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the memory 1110 may be integrated in the processor 1130, or may be provided separately from the processor 1130.
  • the functions of the receiver and the transmitter may be considered to be implemented by a transceiver circuit or a transceiver chip.
  • the processor 1130 may be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.
  • a manner of using a general-purpose computer may be considered to implement the network device provided in the embodiment of the present application.
  • the program code for the functions of the processor 1130, the receiver and the transmitter is to be stored in the memory, and the general-purpose processor implements the functions of the processor 1130, the receiver, and the transmitter by executing the codes in the memory.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product.
  • 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 perform all or part of the steps of the method described in the embodiments of the present application.
  • the aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .

Landscapes

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

Abstract

本申请提供了一种通信方法、终端设备和系统，能够提高通信效率，节约信令开销。该方法包括：第一终端设备向第二终端设备发送第一消息，第一消息用于建立组播组，组播组包括第一终端设备和第二终端设备；第一终端设备从第二终端设备接收第二消息，第二消息用于响应第一消息；第一终端设备根据第一消息和第二消息，获取第二终端设备相对于第一终端设备的第一定时提前值；第一终端设备向第二终端设备发送第三消息，第三消息包括第一定时提前值。

Description

通信方法、设备和系统
本申请要求于2018年6月25日提交中国专利局、申请号为201810663252.0、申请名称为“通信方法、设备和系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种通信方法、设备和系统。
背景技术
在长期演进(long term evolution,LTE)系统中，为了保持上行同步，基站要求来自同一子帧的不同频域资源的不同用户设备(user equipment,UE)的信号到达基站的时间基本上是对齐的，以便于基站正确地解码UE发送的上行数据。为了保证基站侧的定时同步，相关技术提出了定时提前(time advance,TA)机制，基站向每个UE指示UE相对于基站的TA，以控制来自不同UE的上行信号到达基站的时间。例如，对于离基站较远的UE，传输延迟较大，要比离基站更近的UE提前发送上行数据。其中，TA可以是一个用于表征基站接收到UE所发送数据的定时偏差的参量。
随着技术进步，在未来一些其他通信系统中也需要实现定时同步，但业界对此并无相关的定义。例如，车辆对车辆(vehicle-to-vehicle,V2V)通信中，如何实现车载设备之间的定时同步是亟待解决的问题。
发明内容
本申请提供了一种通信方法、终端设备和系统，能够提高通信效率。
第一方面，提供了一种通信方法，包括：第一终端设备向第二终端设备发送第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；所述第一终端设备从所述第二终端设备接收第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；所述第一终端设备根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值；所述第一终端设备向所述第二终端设备发送第三消息，所述第三消息包括所述第一定时提前值。
在本申请实施例中，通过设计终端设备之间的定时同步流程，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在一种可能的实现方式中，所述第一消息为可被检测的序列信号。
在本申请实施例中，所述第一消息为可被检测的序列信号，以便于第二终端设备检测所述第一消息，并在检测到所述第一消息之后回复第二消息，从而根据所述第一消息和第二消息获取所述第一定时提前值，复用第一消息和第二消息的功能，从而在建立组播组的 阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在一种可能的实现方式中，所述可被检测的序列信号为伪随机序列信号。
在本申请实施例中，所述第一消息为伪随机序列信号，以便于第二终端设备检测所述第一消息，并在检测到所述第一消息之后回复第二消息，从而根据所述第一消息和第二消息获取所述第一定时提前值，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在一种可能的实现方式中，所述第一终端设备根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值，包括：所述第一终端设备根据所述第一消息的发送时刻和所述第二消息的接收时刻，获取所述第一定时提前值。
在一种可能的实现方式中，所述组播组还包括第三终端设备，还包括：所述第一终端设备接收所述第三终端设备发送的组内同步信号；所述第一终端设备向所述第三终端设备发送反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；所述第一终端设备接收所述第三终端设备发送的第四消息，所述第四消息包括第二定时提前值，所述第二定时提前值为所述第一终端设备相对于所述第三终端设备的定时提前值，所述第二定时提前值是所述第三终端设备根据所述组内同步信号和所述反馈确认消息获取的。
在本申请实施例中，在建立组播组之后，第一终端设备可以接收组播组中的第三终端设备发送的组内同步信号，以便于从第三终端设备获取第一终端设备相对于所述第三终端设备的第二定时提前值。从而提供了一种组播机制中的定时同步机制，提高了通信效率。
在一种可能的实现方式中，所述第三消息还包括所述第二终端设备的标识。
在一种可能的实现方式中，所述第一消息中包括所述组播组的组标识。
在一种可能的实现方式中，所述第二消息中包括所述第二终端设备的标识和所述组标识。
在一种可能的实现方式中，所述第一终端设备和所述第二终端设备为车载设备。
第二方面，提供了一种通信方法，包括：第二终端设备从第一终端设备接收第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；所述第二终端设备向所述第一终端设备发送第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；所述第二终端设备从所述第一终端设备接收第三消息，所述第三消息包括第一定时提前值，所述第一定时提前值是所述第二终端设备相对于所述第一终端设备的定时提前值，所述第一定时提前值是所述第一终端设备根据所述第一消息和所述第二消息获取的。
在本申请实施例中，通过设计终端设备之间的定时同步流程，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在一种可能的实现方式中，所述第一消息为可被检测的序列信号。
在本申请实施例中，所述第一消息为可被检测的序列信号，以便于第二终端设备检测所述第一消息，并在检测到所述第一消息之后回复第二消息，从而根据所述第一消息和第二消息获取所述第一定时提前值，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在一种可能的实现方式中，所述可被检测的序列信号为伪随机序列信号。
在本申请实施例中，所述第一消息为伪随机序列信号，以便于第二终端设备检测所述第一消息，并在检测到所述第一消息之后回复第二消息，从而根据所述第一消息和第二消息获取所述第一定时提前值，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在一种可能的实现方式中，所述第一消息包括所述组播组的组标识。
在一种可能的实现方式中，所述第二消息中包括所述第二终端设备的标识和所述组标识。
在一种可能的实现方式中，在所述第二终端设备从所述第一终端设备接收所述第三消息之后，还包括：所述第二终端设备向第四终端设备发送组内同步信号，所述组播组还包括所述第四终端设备；所述第二终端设备从所述第四终端设备接收反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；所述第二终端设备根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值；所述第二终端设备向所述第四终端设备发送第五消息，所述第五消息包括所述第三定时提前值。
在本申请实施例中，第二终端设备在建立组播组之后，可以向组播组中的其他终端设备发送组内同步信号，以获取其他终端设备相对于所述第二终端设备的第三定时提前值。并向其他终端设备指示该第三定时提前值。从而提供了一种组播机制中的定时同步机制，提高了通信效率。
在一种可能的实现方式中，所述第二终端设备根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值，包括：所述第二终端设备根据所述组内同步信号的发送时刻和所述反馈确认消息的接收时刻，获取所述第三定时提前值。
在一种可能的实现方式中，所述组内同步信号包括所述组标识以及所述第二终端设备的标识。
在一种可能的实现方式中，所述第五消息还包括所述第四终端设备的标识。
在一种可能的实现方式中，还包括：所述第二终端设备根据第一距离、第二距离以及所述第一定时提前值，获取所述第二终端设备相对于所述第五终端设备的第四定时提前值，其中所述第一距离为所述第二终端设备与所述第一终端设备之间的第一距离；所述第二距离为所述第二终端设备与第五终端设备之间的第二距离。
在一种可能的实现方式中，所述第一终端设备和所述第二终端设备为车载设备。
第三方面，提供了一种终端设备，该终端设备用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。具体地，该终端设备包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的单元。
第四方面，提供了一种终端设备，该终端设备用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。具体地，该终端设备包括用于执行上述第二方面或第二方面的任意可能的实现方式中的方法的单元。
第五方面，提供了一种终端设备，该终端设备包括：通信接口、存储器和处理器。其中，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制该通信接口接收信号和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第一方面或第一方面的任意可能的实现方式中的方法。
第六方面，提供了一种终端设备，该终端设备包括：通信接口、存储器和处理器。其中，该通信接口、该存储器和该处理器通过该总线系统相连，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制该通信接口接收信号和/或发送信号，并且当该处理器执行该存储器存储的指令时，该执行使得该处理器执行第二方面或第二方面的任意可能的实现方式中的方法。
第七方面，提供了一种通信系统，该通信系统包括上述第三方面和第四方面的终端设备，或者包括上述第五方面和第六方面的终端设备。
第八方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第一方面或第一方面的任意可能的实现方式中的方法的指令。
第九方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第二方面或第二方面的任意可能的实现方式中的方法的指令。
附图说明
图1是本申请实施例的一种可能的应用场景的示意图。
图2是本申请又一实施例的一种可能的应用场景的示意图。
图3是本申请实施例的通信方法的示意性流程图。
图4是本申请又一实施例的一种可能的应用场景的示意图。
图5是本申请又一实施例的通信方法的示意性流程图。
图6是本申请又一实施例的通信方法的示意性流程图。
图7是本申请又一实施例的通信方法的示意性流程图。
图8是本申请实施例的终端设备的结构示意图。
图9是本申请又一实施例的终端设备的结构示意图。
图10是本申请又一实施例的终端设备的结构示意图。
图11是本申请又一实施例的终端设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通信(global system formobile communications，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、未来的第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的终端设备可以指车载设备、车载终端设备、车载用户设备、车辆、路侧单元(road side unit,RSU)、用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备。终端设备还可以是未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile  network，PLMN)中的终端设备等，本申请实施例对此并不限定。
在通信系统中，由于发送端和接收端总是存在一定的物理距离，当发送端和接收端通信时，会造成信号传递的时延。如果不采取措施，从接收端侧来说，时延会导致发送端在本时隙上发送的消息与接收端的下一个时隙上收到的另一个消息重叠，导致接收端无法正确的解码信号。因此，现有技术中提出了定时同步机制，以解决上述问题。但是相关技术中并未给出在组播情况下如何实现定时同步机制的方案。
本申请实施例的通信方法可以提出一种面向组播的定时同步机制。该方法可以应用于下图1、图2所示的场景中或其他类似的用于组播的场景中。
图1和图2是本申请实施例的一种可能的应用场景示意图。在该应用场景下可以包括多个终端设备，上述多个终端设备可以组成一个终端设备集合。上述多个终端设备之间可以采用多种通信方式。例如，可以采用广播、单播或组播的方式。其中，组播可以指多个终端设备根据特定规则形成组，组播的形式仅限于组内成员。上述特定规则例如可以是根据相同的业务或相邻的小区等原则划分组。其中上述多个终端设备可以是车载设备、车辆等。
以上述终端设备为车载设备为例，在组播模式下，根据车载设备分组形式不同，可以包括以下两种情况。第一种情况下，如图1所示，车载设备集合中包括一个领导车(leader)101，而其余车载设备称为成员车(member)102，成员车102需要通过领导车101进行通信。上述领导车也可以称为头车，领导车可以是建立组播组的发起者。该场景例如可以是NR-V2V中定义的队列行驶(platooning)场景。在第二种情况下，如图2所示，车载设备集合中的各车载设备的地位相等，车载设备均可以称为成员车102，成员车102之间可以自由通信。在第二种场景下，需要实现每个成员车102和任一其他成员车102之间的定时同步。
图3是本申请实施例的通信方法300的示意性流程图。如图3所示，方法300包括：
S301、第一终端设备向第二终端设备发送第一消息，相应地，第二终端设备接收所述第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和第二终端设备。
可选地，所述第一消息可以是建组消息或建组请求消息。
可选地，所述第一终端设备、第二终端设备可以是车载设备、车辆、车载用户设备、路侧单元(road side unit,RSU)、用户设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备。终端设备还可以是未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，PLMN)中的终端设备等，本申请实施例对此并不限定。
可选地，上述第一消息是可被检测的序列信号。例如，可以是二进制序列。或者，所述第一消息也可以是伪随机序列。以便于组播组中的其他终端设备检测所述第一消息。或者上述第一消息可以是其他形式的信号，只要其他终端设备能够检测到所述第一消息即可。
可选地，上述第一终端设备可以是图1中的领导车101，上述第二终端设备可以是图1中的任意成员车102。或者第一终端设备也可以是图2中任意成员车102，上述第一终端设备可以称为发起建组的成员车。上述第二终端设备可以是除所述发起建组的成员车102之外的其他成员车102。
可选地，所述第一消息中可以包括所述组播组的组标识(identifier,ID)，以便于组播组内的其余终端设备识别组标识。
可选地，所述组标识可以是根据不同业务类型分配的组标识。例如，可以由基站预先向终端设备分配组标识。其中不同的业务类型可以对应不同的组标识。
S302、所述第一终端设备从所述第二终端设备接收第二消息，相应地，所述第二终端设备向所述第一终端设备发送所述第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组。
可选地，所述第二消息可以是建组确认消息。
可选地，所述第二消息可以是应答(acknowledge，ACK)信号。或者也可以是其他类型的信号。
可选地，所述第二消息中可以包括所述组标识和所述第二终端设备的标识。其中，所述组标识可以采用显式的方式指示，也可以采用隐式的方式指示。例如，在隐式的方式中，所述第二消息可以采用所述组标识加扰。所述第二终端设备的标识可以是小区为所述第二终端设备分配的标识。例如，可以是小区无线网络临时标识(cell radio network temporary identifier,C-RNTI)。
S303、所述第一终端设备根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值。
其中，所述第一定时提前值是指所述第二终端设备相对于所述第一终端设备的定时提前值。其中，第二终端设备是发送端，第一终端设备是接收端。定时提前值是一个用于表示发送端向接收端发送数据的定时偏差的参量。或者说，所述第二终端设备向第一终端设备发送数据的时间的偏移量。例如，若定时提前值指示的偏移量为1微秒(μs)，则第二终端设备需提前1μs向第一终端设备发送信号。
可选地，所述第一终端设备可以采用多种方式获取所述第二终端设备相对于所述第一终端设备的第一定时提前值。例如，所述第一终端设备可以根据所述第一消息的发送时刻和所述第二消息的接收时刻，获取所述第一定时提前值。例如，假设所述第一消息的发送时刻是T1，所述第二消息的接收时刻是T2，则第一终端设备可以确定所述第一定时提前值为(T2-T1)/2。又例如，假设所述第一消息的发送时刻是T1、所述第二消息的接收时刻是T2，第二终端接收到第一消息后的处理时间为△t，则第一终端设备可以确定所述第一定时提前值为(T2-T1-△t)/2，T2>T1>0，△t>＝0。
S304、所述第一终端设备向所述第二终端设备发送第三消息，所述第三消息包括所述第一定时提前值。
可选地，所述第三消息中还可以携带第二终端设备的标识。其中，所述第二终端设备的标识用于指示所述第一定时提前值对应于所述第二终端设备。
可选地，在接收到所述定时提前值之后，所述第二终端设备可以根据所述第一定时提前值，向所述第一终端设备发送数据，以使得第一终端设备能够正常的接收和解码第二终端设备发送的数据。
在本申请实施例中，通过设计终端设备之间的定时同步流程，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在本申请实施例中，所述第一消息为可被检测的序列信号，以便于第二终端设备检测所述第一消息，并在检测到所述第一消息之后回复第二消息，从而根据所述第一消息和第二消息获取所述第一定时提前值，复用第一消息和第二消息的功能，从而在建立组播组的阶段同时也实现定时同步，达到了节约信令和提高通信效率的目的。
在图2的场景中，任意成员车之间均可以自由通信。因此，任意成员车之间均需要实现定时同步。第一终端设备可以是图2中发起建组的成员车。因此在第一终端设备向其他终端设备发送数据的情况下，也需要获取第一终端设备相对于其他终端设备的定时提前值。
例如，在S304步骤之后，即建组流程之后，方法300还包括：所述第一终端设备接收所述第三终端设备发送的组内同步信号；所述第一终端设备向所述第三终端设备发送反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；所述第一终端设备接收所述第三终端设备发送的第四消息，所述第四消息包括第二定时提前值，所述第二定时提前值为所述第一终端设备相对于所述第三终端设备的定时提前值，所述第二定时提前值是所述第三终端设备根据所述组内同步信号和所述反馈确认消息获取的。
其中，所述第二定时提前值可以根据所述组内同步信号的发送时刻和所述反馈确认消息的接收时刻获取。
在本申请实施例中，在建立组播组之后，第一终端设备可以接收组播组中的第三终端设备发送的组内同步信号，以便于从第三终端设备获取第一终端设备相对于所述第三终端设备的第二定时提前值。从而提供了一种组播机制中的定时同步机制，提高了通信效率。
在一些示例中，所述组内同步信号可以是可被检测的序列信号。例如，二进制序列信号。或者可以是伪随机序列信号。或者也可以是其他类型的信号。
在本申请实施例中，所述组内同步信号为可被检测的序列信号，以便于第二终端设备检测所述组内同步信号，并在检测到所述组内同步信号之后回复反馈确认消息，从而根据组内同步信号和反馈确认消息获取所述第二定时提前值，从而面向组播机制，提供了一种有效的定时同步方法。
其中，所述第二定时提前值是指所述第一终端设备相对于所述第三终端设备的定时提前值。或者说，所述第一终端设备向第三终端设备发送数据的时间的偏移量。例如，若定时提前值指示的偏移量为1微秒(μs)，则第一终端设备需提前1μs向第三终端设备发送信号。
所述第一终端设备可以根据所述第二定时提前值向所述第三终端设备发送数据。其中，所述第一终端设备可以是图2中的任意成员车，所述第三终端设备可以是组播组中除所述第一终端设备之外的任意终端设备。
可选地，在S304步骤之后，方法300还包括：所述第二终端设备向第四终端设备发送组内同步信号，所述组播组还包括所述第四终端设备，相应地，所述第四终端设备接收所述组内同步信号；所述第四终端设备向所述第二终端设备发送反馈确认消息，相应地，所述第二终端设备从所述第四终端设备接收反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；所述第二终端设备根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值；所述第二终端设备向所述第四终端设备发送所述第三定时提前值。
在一些示例中，所述组内同步信号可以是可被检测的序列信号。例如，二进制序列信 号。或者可以是伪随机序列信号。或者也可以是其他类型的信号。
其中，所述第三定时提前值是指所述第四终端设备相对于所述第二终端设备的定时提前值。或者说，所述第四终端设备向第二终端设备发送数据的时间的偏移量。例如，若定时提前值指示的偏移量为1微秒(μs)，则第四终端设备需提前1μs向第二终端设备发送信号。
在本申请实施例中，第二终端设备在建立组播组之后，可以向组播组中的其他终端设备发送组内同步信号，以获取其他终端设备相对于所述第二终端设备的第三定时提前值。并向其他终端设备指示该第三定时提前值。从而提供了一种组播机制中的定时同步机制，提高了通信效率。
可选地，所述第二终端设备根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值，包括：所述第二终端设备根据所述组内同步信号的发送时刻和所述反馈确认消息的接收时刻，获取所述第三定时提前值。
其中，获取所述第三定时提前值的方式可以参见前文中获取定时提前值的方法的相关描述。
可选地，所述组内同步信号可以包括所述组标识以及所述第二终端设备的标识。例如，所述组标识可以采用显式或隐式的方式指示。例如，可以采用所述组标识加扰所述组内同步信号。
在一些示例中，所述第二终端设备向所述第四终端设备发送所述第三定时提前值，包括：所述第二终端设备向所述第四终端设备发送第二消息，所述第二消息包括所述第三定时提前值和所述第四终端设备的标识。所述第四终端设备的标识对应于所述第三定时提前值。
可选地，所述组播组还包括第五终端设备。所述方法还包括：所述第二终端设备根据第一距离、第二距离以及所述第一定时提前值，获取所述第二终端设备相对于所述第五终端设备的第四定时提前值，其中所述第一距离为所述第二终端设备与所述第一终端设备之间的第一距离；所述第二距离为所述第二终端设备与第五终端设备之间的第二距离。所述第五终端设备可以是组播组中除所述第二终端设备之外的任意成员车。
即所述第二终端设备可以根据第一定时提前值以及终端设备之间的距离，自行确定第二终端设备相对于第五终端设备之间的第四定时提前值，以便于根据第二终端设备根据该第四定时提前值向所述第五终端设备发送数据。
原理上讲，定时提前值与距离成正比关系，即距离越近，定时提前值越小，距离越远，定时提前值越大。例如，所述假设所述第一距离为d1，所述第二距离为d2，第一定时提前值为TA1，可以根据所述第一距离和第二距离的比值获取第四定时提前值TA4。即TA4＝(d2/d1)×TA1。
作为另一个示例，图4是本申请又一实施例中的应用环境的示意图。例如，在所述多个终端设备在同一侧道路方向活动的情况下，假设第二终端设备402相对于第一终端设备401之间的定时提前值为TA1，第三终端设备403相对于第一终端设备401之间的定时提前值为TA2，则第三终端设备403相对于第二终端设备的定时提前值为TA3＝TA2-TA1。
例如，第一终端设备401可以向所有其他终端设备发送广播消息，该广播消息内含所有组播组内的终端设备的标识及其他终端设备相对于第一终端设备401定时提前值。当其 他终端设备收到消息后，获得自己相对于第一终端设备401的定时提前值，并且也获得了其他终端设备相对于第一终端设备401的定时提前值。例如，第二终端设备402相对于第一终端设备401的定时提前值TA1，第三终端设备相对于第一终端设备401的定时提前值TA2。则第三终端设备需要向第二终端设备发送消息时，可自行算出第三终端设备403相对于第二终端设备402的定时提前值TA3＝TA2-TA1。另外需说明的是，在这种情况下，第三终端设备相对于第二终端设备的定时提前值TA3与第二终端设备相对于第三终端设备的定时提前值TA3’是相同的。即TA3’＝TA2-TA1。
图5是本申请又一实施例的通信方法的具体流程示意图。在图5的场景中，假设上述终端设备为车辆，且组播组中包括一个领导车和多个成员车。因此成员车之间均需要通过领导车进行通信。在该情况下，由领导车发起建组流程，并在建组过程中完成成员车与领导车的定时同步。为了简洁，图5中与前文中相同或相似的内容，此处不再赘述。图5的方法包括：
S501、领导车发送第一消息，所述第一消息用于建立组播组，相应地，成员车接收所述第一消息。
在一些示例中，所述第一消息是可被检测的序列信号。第一消息可以用于指示组播组的组标识。
S502、成员车检测第一消息，并向领导车发送第二消息。相应地，领导车接收所述第二消息。
可选地，上述第二消息可以由组标识加扰。可选地，上述第二消息可以指示所述成员车的标识。
S503、领导车根据所述第一消息和第二消息，获取所述成员车相对于领导车的定时提前值。
S504、领导车向成员车发送第三消息，所述第三消息用于指示所述成员车的标识以及对应的定时提前值。
在本申请实施例中，通过对第一消息和第二消息的复用，同时实现建组和定时同步的过程。在上述信令交互过程中，领导车获取了成员车的标识，成员车获取了成员车相对于领导车的定时提前值。因此通过设计相应的建组和同步流程，降低了信令开销，减少了时延，提高了通信效率。
图6是本申请又一实施例的通信方法的具体流程示意图。在图6的场景中，假设上述终端设备为车辆。组播组中包括多个成员车，且组播组中的成员车之间可以自由进行通信。在该场景下，组内的成员车可以处于任意位置，由任意成员车发起建组。为了简洁，图6中与前文相同或相似的内容，此处不再赘述。图6的方法包括：
S601、第一成员车发送第一消息，所述第一消息用于建立组播组，相应地，组播组中的第二成员车接收所述第一消息。
可选地，所述第一消息可以是建组消息或建组请求消息。
在一些示例中，所述第一消息是可被检测的序列信号。第一消息可以用于指示组播组的组标识。
其中，所述第一成员车为发起建组流程的成员车。所述第一成员车可以是组播组中的任意成员车。第二成员车可以是所述组播组中除所述成员车之外的任意成员车。
S602、第二成员车检测所述第一消息，并向第一成员车发送第二消息，相应地，第一成员车接收所述第二消息。
可选地，所述第二消息可以是建组确认消息。
可选地，上述第二消息可以用组标识加扰，且上述第二消息还可用于指示第二成员车的标识。例如，上述第二消息中包括所述第二成员车的标识。
S603、第一成员车根据所述第一消息和第二消息，获取第二成员车相对于第一成员车的第一定时提前值。
S604、第一成员车向所述第二成员车发送所述第一定时提前值。
例如，第一成员车可以向第二成员车发送第三消息，第三消息中包括所述第二成员车和的标识以及该标识对应的第一定时提前值。
S605、第二成员车在接收到第一定时提前值之后，可以向第三成员车发送组内同步信号，相应地，第三成员车接收所述组内同步信号。
其中，第三成员车可以是所述组播组内除第二成员车之外的任意成员车。
在一个示例中，上述组内同步信号是可被检测的序列信号，例如伪随机序列信号。
在一个示例中，上述组内同步信号可包括组标识和第二成员车的标识。
S606、第三成员车在接收到所述组内同步信号之后，可以向所述第二成员车发送反馈确认消息，相应地，所述第三成员车接收所述反馈确认消息。
其中，第三成员车可以检测所述组内同步信号，并在检测到所述组内同步信号之后，发送反馈确认消息。
可选地，上述反馈确认消息中可以包括组标识和所述第三成员车的标识。
S607、所述第二成员车根据所述反馈确认消息，获取所述第三成员车相对所述第二成员车的第三定时提前值。
S608、所述第二成员车向所述第三成员车发送所述第三定时提前值。相应地，所述第三成员车接收所述第三定时提前值。
例如，所述第二成员车可以向所述第三成员车发送第五消息，第五消息中包括所述第三成员车的标识以及所述第三定时提前值。
在本申请实施例中，通过对第一消息和第二消息的复用，同时实现建组和定时同步的过程。在上述信令交互过程中成员车可以获取其他成员车相对于该成员车的定时提前值。因此通过设计相应的建组和同步流程，降低了信令开销，减少了时延。
图7是本申请又一实施例的具体流程示意图。在图7的场景中，假设上述终端设备为车辆。组播组中包括多个成员车，且组播组中的成员车之间可以自由进行通信。在该场景下，组内的成员车在同一道路方向侧向行驶。其中任意成员车可以发起建组流程。例如，可以假设行驶在最前方的成员车为发起建组的成员车。在已知各成员车之间的间距的情况下，成员车可以根据自己与发起建组的成员车之间的定时提前值确定成员车与其他成员车之间的定时提前值。为了简洁，图7中与前文相同或相似的内容，此处不再赘述。图7的方法包括：
S701、第一成员车发送第一消息，所述第一消息用于建立组播组，相应地，第二成员车接收所述第一消息。
可选地，所述第一消息可以是建组消息或建组请求消息。
在一些示例中，所述第一消息是可被检测的序列信号。第一消息可以用于指示组播组的组标识。
其中，所述第一成员车为发起建组流程的成员车。所述第一成员车可以是组播组中的任意成员车。第二成员车可以是所述组播组中除所述成员车之外的任意成员车。
S702、第二成员车检测所述第一消息，并向第一成员车发送第二消息，相应地，第一成员车接收所述第二消息。
可选地，所述第二消息可以是建组消息。
可选地，上述第二消息可以用组标识加扰，且上述第二消息还用于指示第二成员车的标识。例如，上述第二消息中包括所述第二成员车的标识。
S703、第一成员车根据所述第一消息和第二消息，获取第二成员车相对于第一成员车的第一定时提前值。
S704、第一成员车向所述第二成员车发送所述第一定时提前值。
例如，第一成员车可以向第二成员车发送第三消息，第三消息中包括所述第二成员车和的标识以及该标识对应的第一定时提前值。
S705、第二成员车在接收到第一定时提前值之后，可以根据所述第一定时提前值以及第二成员车与第一成员车之间的第一距离，第二成员车与第四成员车之间的第二距离，确定所述第四成员车相对于所述第二成员车的第四定时提前值。
例如，假设第一定时提前值为TA1，第四定时提前值为TA4，第一距离为d1，第二距离为d2。则TA4＝(d2/d1)*TA1。
在本申请实施例中，通过对第一消息和第二消息的复用，同时实现建组和定时同步的过程。在上述信令交互过程中成员车可以获取相对于其他成员车的定时提前值。因此通过设计相应的建组和同步流程，降低了信令开销，减少了时延。并且成员车可以根据成员车之间的距离和已知的定时提前值，获取成员车相对于其他成员车的定时提前值，提高了定时同步的效率。
上文结合图1至7描述了本申请实施例的通信方法及应用环境。接下来结合图8至图11描述本申请实施例中的装置。
图8是本申请实施例的终端设备800的结构示意图。应理解，终端设备800能够执行图1至图7的方法中由第一终端设备执行的各个步骤，为了避免重复，此处不再详述。终端设备800包括：发送单元810、接收单元820和处理单元830，
所述发送单元810用于向第二终端设备发送第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；
所述接收单元820用于从所述第二终端设备接收第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；
所述处理单元830用于根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值；
所述发送单元810还用于向所述第二终端设备发送第三消息，所述第三消息包括所述第一定时提前值。
其中，上述发送单元810可以被发送器、收发器或通信接口替换，上述接收单元820可以被接收器、收发器或通信接口替换。上述处理单元830可以被处理器替换。作为一种 实现方式，接收器、发送器或通信接口的功能可以考虑通过收发电路或者收发专用芯片实现。处理器可以考虑通过专用处理芯片、处理电路、处理器或者通用芯片实现。
图9是本申请又一实施例的终端设备900的结构示意图。应理解，终端设备900能够执行图1至图7的方法中由第二终端设备执行的各个步骤，或者其他终端设备执行的步骤，为了避免重复，此处不再详述。终端设备900包括：接收单元910和发送单元920，
所述接收单元910用于从第一终端设备接收第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；
所述发送单元920用于向所述第一终端设备发送第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；
所述接收单元910用于从所述第一终端设备接收第三消息，所述第三消息包括第一定时提前值，所述第一定时提前值是所述第二终端设备相对于所述第一终端设备的定时提前值，所述第一定时提前值是所述第一终端设备根据所述第一消息和所述第二消息获取的。
其中，上述接收单元910可以被接收器、收发器或通信接口替换，上述发送单元920可以被发送器、收发器或通信接口替换。作为一种实现方式，接收器、发送器或通信接口的功能可以考虑通过收发电路或者收发专用芯片实现。
图10是本申请实施例的终端设备1000的示意性框图。应理解，终端设备1000能够执行图1至图7的方法中由第一终端设备执行的各个步骤，为了避免重复，此处不再详述。终端设备1000包括：
存储器1010，用于存储程序；
通信接口1020，用于和其他设备进行通信；
处理器1030，用于执行存储器1010中的程序，当所述程序被执行时，所述处理器1030用于通过所述通信接口1020向第二终端设备发送第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和第二终端设备；以及通过所述通信接口从所述第二终端设备接收第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；以及根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值；以及通过所述通信接口向所述第二终端设备发送第三消息，所述第三消息包括所述第一定时提前值。
应理解，图10所示的终端设备可以是车载设备，也可以为芯片或电路，或者其他类型的终端设备。例如可设置在车载设备内的芯片或电路。进一步地，上述通信接口1020也可以与收发器互换。收发器包括接收器和发送器。再进一步地，该终端设备1000还可以包括总线系统。
其中，处理器1030、存储器1010、接收器和发送器通过总线系统相连，处理器1030用于执行该存储器1010存储的指令，以控制接收器接收信号，并控制发送器发送信号，完成本申请通信方法中网络设备的步骤。其中，接收器和发送器可以为相同或不同的物理实体。为相同的物理实体时，可以统称为收发器。所述存储器1010可以集成在所述处理器1030中，也可以与所述处理器1030分开设置。
作为一种实现方式，接收器和发送器的功能可以考虑通过收发电路或者收发专用芯片实现。处理器1030可以考虑通过专用处理芯片、处理电路、处理器或者通用芯片实现。
作为另一种实现方式，可以考虑使用通用计算机的方式来实现本申请实施例提供的网 络设备。即将实现处理器1030，接收器和发送器功能的程序代码存储在存储器中，通用处理器通过执行存储器中的代码来实现处理器1030、接收器和发送器的功能。
图11是本申请实施例的终端设备1100的示意性框图。应理解，终端设备1100能够执行图1至图7的方法中由第二终端设备执行的各个步骤，为了避免重复，此处不再详述。终端设备1100包括：
存储器1110，用于存储程序；
通信接口1120，用于和其他设备进行通信；
处理器1130，用于执行存储器1110中的程序，当所述程序被执行时，所述处理器1130用于通过所述通信接口1120从第一终端设备接收第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；通过所述通信接口1120向所述第一终端设备发送第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；通过所述通信接口1120从所述第一终端设备接收第三消息，所述第三消息包括第一定时提前值，所述第一定时提前值是所述第二终端设备相对于所述第一终端设备的定时提前值，所述第一定时提前值是所述第一终端设备根据所述第一消息和所述第二消息获取的。
应理解，图11所示的终端设备可以是车载设备，也可以为芯片或电路，或者其他类型的终端设备。例如可设置在车载设备内的芯片或电路。进一步地，上述通信接口1120也可以与收发器互换。收发器包括接收器和发送器。再进一步地，该终端设备1100还可以包括总线系统。
其中，处理器1130、存储器1110、接收器和发送器通过总线系统相连，处理器1130用于执行该存储器1110存储的指令，以控制接收器接收信号，并控制发送器发送信号，完成本申请通信方法中网络设备的步骤。其中，接收器和发送器可以为相同或不同的物理实体。为相同的物理实体时，可以统称为收发器。所述存储器1110可以集成在所述处理器1130中，也可以与所述处理器1130分开设置。
作为一种实现方式，接收器和发送器的功能可以考虑通过收发电路或者收发专用芯片实现。处理器1130可以考虑通过专用处理芯片、处理电路、处理器或者通用芯片实现。
作为另一种实现方式，可以考虑使用通用计算机的方式来实现本申请实施例提供的网络设备。即将实现处理器1130，接收器和发送器功能的程序代码存储在存储器中，通用处理器通过执行存储器中的代码来实现处理器1130、接收器和发送器的功能。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显 示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (36)

  1. 一种通信方法，其特征在于，包括：
    第一终端设备向第二终端设备发送第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；
    所述第一终端设备从所述第二终端设备接收第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；
    所述第一终端设备根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值；
    所述第一终端设备向所述第二终端设备发送第三消息，所述第三消息包括所述第一定时提前值。
  2. 如权利要求1所述的通信方法，其特征在于，所述第一消息为可被检测的序列信号。
  3. 如权利要求1或2所述的通信方法，其特征在于，所述可被检测的序列信号为伪随机序列信号。
  4. 如权利要求至1至3中任一项所述的通信方法，其特征在于，所述第一终端设备根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值，包括：
    所述第一终端设备根据所述第一消息的发送时刻和所述第二消息的接收时刻，获取所述第一定时提前值。
  5. 如权利要求1至4中任一项所述的通信方法，其特征在于，所述组播组还包括第三终端设备，所述方法还包括：
    所述第一终端设备接收所述第三终端设备发送的组内同步信号；
    所述第一终端设备向所述第三终端设备发送反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；
    所述第一终端设备接收所述第三终端设备发送的第四消息，所述第四消息包括第二定时提前值，所述第二定时提前值为所述第一终端设备相对于所述第三终端设备的定时提前值，所述第二定时提前值是所述第三终端设备根据所述组内同步信号和所述反馈确认消息获取的。
  6. 如权利要求1至5中任一项所述的通信方法，其特征在于，所述第三消息还包括所述第二终端设备的标识。
  7. 如权利要求1至6中任一项所述的通信方法，其特征在于，所述第一消息中包括所述组播组的组标识。
  8. 如权利要求1至7中任一项所述的通信方法，其特征在于，所述第二消息中包括所述第二终端设备的标识和所述组标识。
  9. 一种通信方法，其特征在于，包括：
    第二终端设备从第一终端设备接收第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；
    所述第二终端设备向所述第一终端设备发送第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；
    所述第二终端设备从所述第一终端设备接收第三消息，所述第三消息包括第一定时提前值，所述第一定时提前值是所述第二终端设备相对于所述第一终端设备的定时提前值，所述第一定时提前值是所述第一终端设备根据所述第一消息和所述第二消息获取的。
  10. 如权利要求9所述的通信方法，其特征在于，所述第一消息为可被检测的序列信号。
  11. 如权利要求9或10所述的通信方法，其特征在于，所述可被检测的序列信号为伪随机序列信号。
  12. 如权利要求9至11中任一项所述的通信方法，其特征在于，所述第一消息包括所述组播组的组标识。
  13. 如权利要求9至12中任一项所述的通信方法，其特征在于，所述第二消息中包括所述第二终端设备的标识和所述组标识。
  14. 如权利要求9至13中任一项所述的通信方法，其特征在于，在所述第二终端设备从所述第一终端设备接收所述第三消息之后，所述方法还包括：
    所述第二终端设备向第四终端设备发送组内同步信号，所述组播组还包括所述第四终端设备；
    所述第二终端设备从所述第四终端设备接收反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；
    所述第二终端设备根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值；
    所述第二终端设备向所述第四终端设备发送第五消息，所述第五消息包括所述第三定时提前值。
  15. 如权利要求14所述的通信方法，其特征在于，所述第二终端设备根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值，包括：
    所述第二终端设备根据所述组内同步信号的发送时刻和所述反馈确认消息的接收时刻，获取所述第三定时提前值。
  16. 如权利要求14或15所述的通信方法，其特征在于，所述组内同步信号包括所述组标识以及所述第二终端设备的标识。
  17. 如权利要求14至16中任一项所述的通信方法，其特征在于，所述第五消息还包括所述第四终端设备的标识。
  18. 如权利要求9至17中任一项所述的通信方法，其特征在于，所述方法还包括：
    所述第二终端设备根据第一距离、第二距离以及所述第一定时提前值，获取所述第二终端设备相对于所述第五终端设备的第四定时提前值，其中所述第一距离为所述第二终端设备与所述第一终端设备之间的第一距离；所述第二距离为所述第二终端设备与第五终端设备之间的第二距离。
  19. 一种终端设备，其特征在于，所述终端设备为第一终端设备，包括：
    发送单元，用于向第二终端设备发送第一消息，所述第一消息用于建立组播组，所述 组播组包括所述第一终端设备和第二终端设备；
    接收单元，用于从所述第二终端设备接收第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；
    处理单元，用于根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值；
    所述发送单元还用于向所述第二终端设备发送第三消息，所述第三消息包括所述第一定时提前值。
  20. 如权利要求19所述的终端设备，其特征在于，所述第一消息为可被检测的序列信号。
  21. 如权利要求19或20所述的终端设备，其特征在于，所述可被检测的序列信号为伪随机序列信号。
  22. 如权利要求至19至21中任一项所述的终端设备，其特征在于，在根据所述第一消息和所述第二消息，获取所述第二终端设备相对于所述第一终端设备的第一定时提前值方面，所述处理单元用于根据所述第一消息的发送时刻和所述第二消息的接收时刻，获取所述第一定时提前值。
  23. 如权利要求19至22中任一项所述的终端设备，其特征在于，所述组播组还包括第三终端设备，
    所述接收单元还用于接收所述第三终端设备发送的组内同步信号；
    所述发送单元还用于向所述第三终端设备发送反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；
    所述接收单元还用于接收所述第三终端设备发送的第四消息，所述第四消息包括第二定时提前值，所述第二定时提前值为所述第一终端设备相对于所述第三终端设备的定时提前值，所述第二定时提前值是所述第三终端设备根据所述组内同步信号和所述反馈确认消息获取的。
  24. 如权利要求19至23中任一项所述的终端设备，其特征在于，所述第三消息还包括所述第二终端设备的标识。
  25. 如权利要求19至24中任一项所述的终端设备，其特征在于，所述第一消息中包括所述组播组的组标识。
  26. 如权利要求19至25中任一项所述的终端设备，其特征在于，所述第二消息中包括所述第二终端设备的标识和所述组标识。
  27. 一种终端设备，其特征在于，包括：
    接收单元，用于从第一终端设备接收第一消息，所述第一消息用于建立组播组，所述组播组包括所述第一终端设备和所述第二终端设备；
    发送单元，用于向所述第一终端设备发送第二消息，所述第二消息用于确认所述第二终端设备属于所述组播组；
    所述接收单元还用于从所述第一终端设备接收第三消息，所述第三消息包括第一定时提前值，所述第一定时提前值是所述第二终端设备相对于所述第一终端设备的定时提前值，所述第一定时提前值是所述第一终端设备根据所述第一消息和所述第二消息获取的。
  28. 如权利要求27所述的终端设备，其特征在于，所述第一消息为可被检测的序列 信号。
  29. 如权利要求27或28所述的终端设备，其特征在于，所述可被检测的序列信号为伪随机序列信号。
  30. 如权利要求27至29中任一项所述的终端设备，其特征在于，所述第一消息包括所述组播组的组标识。
  31. 如权利要求27至30中任一项所述的终端设备，其特征在于，所述第二消息中包括所述第二终端设备的标识和所述组标识。
  32. 如权利要求27至31中任一项所述的终端设备，其特征在于，所述终端设备还包括处理单元，在所述接收单元从所述第一终端设备接收所述第三消息之后，
    所述发送单元还用于向第四终端设备发送组内同步信号，所述组播组还包括所述第四终端设备；
    所述接收单元还用于从所述第四终端设备接收反馈确认消息，所述反馈确认消息用于响应所述组内同步信号；
    所述处理单元用于根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值；
    所述发送单元还用于向所述第四终端设备发送第五消息，所述第五消息包括所述第三定时提前值。
  33. 如权利要求32所述的终端设备，其特征在于，在根据所述组内同步信号和所述反馈确认消息，获取所述第四终端设备相对于所述第二终端设备的第三定时提前值方面，所述处理单元用于根据所述组内同步信号的发送时刻和所述反馈确认消息的接收时刻，获取所述第三定时提前值。
  34. 如权利要求32或33所述的终端设备，其特征在于，所述组内同步信号包括所述组标识以及所述第二终端设备的标识。
  35. 如权利要求32至34中任一项所述的终端设备，其特征在于，所述第五消息还包括所述第四终端设备的标识。
  36. 如权利要求27至35中任一项所述的终端设备，其特征在于，所述终端设备还包括处理单元，所述处理单元用于根据第一距离、第二距离以及所述第一定时提前值，获取所述第二终端设备相对于所述第五终端设备的第四定时提前值，其中所述第一距离为所述第二终端设备与所述第一终端设备之间的第一距离；所述第二距离为所述第二终端设备与第五终端设备之间的第二距离。
PCT/CN2019/091757 2018-06-25 2019-06-18 通信方法、设备和系统 WO2020001330A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19825403.9A EP3813390A4 (en) 2018-06-25 2019-06-18 COMMUNICATIONS PROCESS, DEVICE AND SYSTEM
US17/132,605 US20210120375A1 (en) 2018-06-25 2020-12-23 Communications method, device, and system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810663252.0 2018-06-25
CN201810663252.0A CN110636455B (zh) 2018-06-25 2018-06-25 通信方法、设备和系统

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/132,605 Continuation US20210120375A1 (en) 2018-06-25 2020-12-23 Communications method, device, and system

Publications (1)

Publication Number Publication Date
WO2020001330A1 true WO2020001330A1 (zh) 2020-01-02

Family

ID=68968707

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/091757 WO2020001330A1 (zh) 2018-06-25 2019-06-18 通信方法、设备和系统

Country Status (4)

Country Link
US (1) US20210120375A1 (zh)
EP (1) EP3813390A4 (zh)
CN (1) CN110636455B (zh)
WO (1) WO2020001330A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4184206A4 (en) * 2020-07-16 2024-05-08 Beijing Xiaomi Mobile Software Co Ltd DISTANCE MEASUREMENT METHOD AND DEVICE IN A SYNCHRONIZATION SYSTEM, DEVICE AND READABLE STORAGE MEDIUM
CN113892290A (zh) * 2021-09-03 2022-01-04 北京小米移动软件有限公司 一种定时提前值上报方法、装置及存储介质

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101394223A (zh) * 2007-09-21 2009-03-25 大唐移动通信设备有限公司 保持上行同步的方法、基站和终端
CN102811455A (zh) * 2011-06-01 2012-12-05 华为技术有限公司 实现覆盖测量的方法及设备
CN104488335A (zh) * 2012-07-26 2015-04-01 富士通株式会社 基站装置、移动站装置、通信系统和通信方法
CN105359596A (zh) * 2013-09-09 2016-02-24 华为技术有限公司 时间提前量的调整方法、设备及系统
US20160270019A1 (en) * 2015-03-09 2016-09-15 Ofinno Technologies, Llc Uplink Signal Transmission in Carrier Aggregation
CN107787039A (zh) * 2016-08-29 2018-03-09 华为技术有限公司 上行传输方法、下行传输方法、用户设备和基站

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7848278B2 (en) * 2006-10-23 2010-12-07 Telcordia Technologies, Inc. Roadside network unit and method of organizing, managing and maintaining local network using local peer groups as network groups
US9325480B2 (en) * 2013-07-10 2016-04-26 Google Technology Holdings LLC Methods and device for performing device-to-device communication
EP3136631B1 (en) * 2014-04-24 2020-01-15 LG Electronics Inc. Method for transmitting synchronization signal for d2d communication in wireless communication system and apparatus therefor
EP3178172B1 (en) * 2014-08-06 2022-11-02 Sharp Kabushiki Kaisha Synchronization signals for device-to-device communications
WO2016201701A1 (zh) * 2015-06-19 2016-12-22 华为技术有限公司 通信方法和装置
WO2017033486A1 (en) * 2015-08-21 2017-03-02 Nec Corporation Vehicle to everything (v2x) communication method and system
CN105959977B (zh) * 2015-12-17 2019-09-10 北京邮电大学 无蜂窝覆盖场景下D2D Mesh网络中含支撑节点的混合式同步方法
US20170280406A1 (en) * 2016-03-25 2017-09-28 Sharp Laboratories Of America, Inc. Synchronization method and apparatus for v2x communications
CN107295626B (zh) * 2016-04-01 2022-02-08 北京三星通信技术研究有限公司 一种v2x同步信号和psbch的发送方法和设备
CN106413078A (zh) * 2016-09-12 2017-02-15 厦门大学 一种d2d通信的同步方法及d2d通信装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101394223A (zh) * 2007-09-21 2009-03-25 大唐移动通信设备有限公司 保持上行同步的方法、基站和终端
CN102811455A (zh) * 2011-06-01 2012-12-05 华为技术有限公司 实现覆盖测量的方法及设备
CN104488335A (zh) * 2012-07-26 2015-04-01 富士通株式会社 基站装置、移动站装置、通信系统和通信方法
CN105359596A (zh) * 2013-09-09 2016-02-24 华为技术有限公司 时间提前量的调整方法、设备及系统
US20160270019A1 (en) * 2015-03-09 2016-09-15 Ofinno Technologies, Llc Uplink Signal Transmission in Carrier Aggregation
CN107787039A (zh) * 2016-08-29 2018-03-09 华为技术有限公司 上行传输方法、下行传输方法、用户设备和基站

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3813390A4

Also Published As

Publication number Publication date
EP3813390A4 (en) 2021-05-26
CN110636455B (zh) 2021-02-23
CN110636455A (zh) 2019-12-31
US20210120375A1 (en) 2021-04-22
EP3813390A1 (en) 2021-04-28

Similar Documents

Publication Publication Date Title
US20220279310A1 (en) Position information determination method and device, and first terminal and second terminal
EP3567907B1 (en) Information feedback method and apparatus
JP6984921B2 (ja) ２次ノードを追加するための方法およびその装置
WO2018027790A1 (zh) 传输数据的方法和装置
EP3817309A1 (en) Wireless communication method and device
CN105307284A (zh) 一种随机接入方法及用户设备
WO2020001330A1 (zh) 通信方法、设备和系统
JP6430513B2 (ja) デバイス対デバイス信号を検出するための方法、ユーザ機器および基地局
WO2019154024A1 (zh) 波束确定方法及第一通信设备、第二通信设备
TWI744427B (zh) 用於隨機接入的方法和設備
CN113630738B (zh) 一种侧行链路通信方法及装置
JP2023159308A (ja) フィードバック情報の伝送方法及び端末デバイス
TWI737726B (zh) 同步方法、終端和網路設備
US20220132466A1 (en) Reducing unsuccessful paging
CN107172717B (zh) 蓝牙设备及其蓝牙设备的互搜索方法
KR20230067655A (ko) 브로드캐스트 기반 유니캐스트 세션 방법 및 장치
EP3562250B1 (en) Methods and apparatuses for random access
CN108882388B (zh) 一种随机接入方法及基站
US20240097858A1 (en) Resource Processing Method, Apparatus, and System, and Storage Medium
CN109818724B (zh) 获取及发送系统消息的方法、终端、基站、可读介质
CN111527785A (zh) 一种信息反馈方法及装置、计算机存储介质
CN111294844B (zh) 波束失败恢复方法及用户终端、计算机可读存储介质
WO2017092790A1 (en) Mechanism for acknowledging broadcast/multicast messages
WO2019029447A1 (zh) 其它系统信息的传输方法、基站及用户设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19825403

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2019825403

Country of ref document: EP

Effective date: 20210125