WO2017076195A1 - Procédé de synchronisation d'horloges, et procédé et appareil d'émission d'informations de synchronisation - Google Patents

Procédé de synchronisation d'horloges, et procédé et appareil d'émission d'informations de synchronisation Download PDF

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Publication number
WO2017076195A1
WO2017076195A1 PCT/CN2016/103293 CN2016103293W WO2017076195A1 WO 2017076195 A1 WO2017076195 A1 WO 2017076195A1 CN 2016103293 W CN2016103293 W CN 2016103293W WO 2017076195 A1 WO2017076195 A1 WO 2017076195A1
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WIPO (PCT)
Prior art keywords
synchronization
level
terminal
subframe
synchronization level
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PCT/CN2016/103293
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English (en)
Chinese (zh)
Inventor
周海军
赵丽
李媛媛
赵毅
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电信科学技术研究院
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Publication of WO2017076195A1 publication Critical patent/WO2017076195A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present application relates to the field of wireless communications, and in particular, to a clock synchronization method, a synchronization information transmission method, and an apparatus.
  • Clock synchronization is important for communication networks.
  • the transmitting end places the digital pulse signal at a specific time position (that is, in a specific time slot), and the receiving end needs to extract and interpret the pulse at a specific time position to ensure normal transmission and reception ends.
  • Communication This function of ensuring that the transmitting and receiving ends can correctly extract/send information at a specific time position is realized by the timing clocks at both ends of the transmitting and receiving. Therefore, the purpose of clock synchronization is to limit the clock frequency and phase of each node in the network to a predetermined tolerance range to avoid deterioration of transmission performance (such as bit error, jitter, etc.) due to inaccurate transmission and reception positioning.
  • the D2D communication system is a short-distance communication service that enables direct transmission of data between terminals.
  • the combination of the D2D communication system and the cellular communication system can increase the spectrum efficiency of the cellular communication system, reduce the terminal transmission power, and shorten the delay.
  • the D2D terminal performs clock synchronization by receiving synchronization information sent by the base station or other D2D terminals.
  • some embodiments of the present application provide a clock synchronization method and apparatus for implementing clock synchronization.
  • the UTC system If the terminal receives the timing signal of the UTC system, the UTC system is clocked as a synchronization source and enters the synchronization level 1; otherwise, if the synchronization signal is received within the first time period, according to the level of the synchronization signal
  • the terminal or the base station that transmits the synchronization signal is used as a synchronization source for clock synchronization.
  • the base station that sends the synchronization signal is clocked as a synchronization source according to the level of the synchronization signal, including: if not received within the first time period To the timing signal of the UTC system, but receiving the downlink pilot signal transmitted by the base station of the synchronization level 0, then:
  • timing compensation enable flag configured by the base station, where the timing compensation enable flag is used to indicate whether the timing compensation is enabled; If the timing compensation is enabled, and the terminal is clock synchronization based on timing compensation based on distance calibration or uplink synchronization calibration, the terminal enters synchronization level 2, otherwise enters synchronization level 3, if timing compensation If not enabled, enter synchronization level 2;
  • the base station of the synchronization level 0 is a base station that performs clock synchronization with the UTC system and can broadcast the offset of the downlink pilot signal and the UTC clock.
  • the terminal that transmits the synchronization signal is clocked as a synchronization source according to the level of the synchronization signal, including:
  • the terminal of the synchronization level 1 If the synchronization signal sent by the terminal of the synchronization level 1 is received within the first time period, the terminal of the synchronization level 1 is clocked as a synchronization source, and enters the synchronization level 2; or
  • the terminal of the synchronization level 2 is clocked as a synchronization source, and enters Sync level 3; or,
  • the clock synchronization is performed according to the synchronization signals of all the synchronization levels 3 received in the N synchronization periods, or is received in the N synchronization periods.
  • the terminal with the highest time is clocked as the synchronization source, and enters the synchronization level 3, where N is an integer greater than or equal to 1; wherein the synchronization signal of the synchronization level 3
  • the synchronization level signal is transmitted by the terminal of the synchronization level 3 and/or the base station, and the base station of the synchronization level 3 refers to a base station that is not clocked with the UTC system or a base station that cannot obtain its own position.
  • the method further includes: if the timing signal of the UTC system is not received within the first duration, and the synchronization signal sent by the base station or other terminal is not received, then the second duration after the first duration is cut off, Synchronization level 3.
  • the method further includes: if the terminal entering the synchronization level 1 receives the synchronization signal sent by the base station or other terminal, discarding the base station or other terminal that sends the synchronization signal as a synchronization source for clock synchronization.
  • An embodiment of the first aspect of the present application further provides a terminal, including: a receiving module and a synchronization module;
  • the synchronization module is configured to: when the receiving module receives the timing signal of the UTC system of the Coordinated Time, synchronize the clock with the UTC system as a synchronization source, and enter a synchronization level 1; otherwise, if the first duration is Receiving the synchronization signal, the receiving module performs clock synchronization on the terminal or the base station that sends the synchronization signal as a synchronization source according to the level of the synchronization signal.
  • the synchronization module is specifically configured to:
  • the downlink pilot signal transmitted by the base station is:
  • the timing compensation enable flag is used to indicate whether the timing compensation is enabled; If the timing compensation is enabled, and the terminal is clock synchronization based on the timing compensation based on the distance calibration or the uplink synchronization calibration, the synchronization level 2 is entered, otherwise the synchronization level 3 is entered, if the timing compensation is not made Yes, enter the synchronization level 2;
  • the base station of the synchronization level 0 is a base station that performs clock synchronization with the UTC system and can broadcast the offset of the downlink pilot signal and the UTC clock.
  • the synchronization module is specifically configured to:
  • the receiving module receives the synchronization signal sent by the terminal of the synchronization level 1 in the first time period, the terminal of the synchronization level 1 is clocked as a synchronization source, and enters the synchronization level 2; or
  • the receiving module does not receive the synchronization signal sent by the terminal of the synchronization level 1 in the first time period, but receives the synchronization signal sent by the terminal of the synchronization level 2, the terminal of the synchronization level 2 is used as the synchronization source to perform the clock.
  • the clock synchronization is performed according to the synchronization signals of all the synchronization levels 3 received in the N synchronization periods, or the N synchronization periods are performed.
  • the terminal with the highest time is clocked as the synchronization source, and enters the synchronization level 3, where N is an integer greater than or equal to 1; wherein the synchronization level
  • the synchronization signal of 3 includes a synchronization level 3 terminal and/or a synchronization signal transmitted by the base station, and the synchronization level 3 base station refers to a base station that is not clock synchronized with the UTC system or a base station that cannot obtain its own position.
  • the synchronization module is further configured to: if the receiving module does not receive the timing signal of the UTC system within the first duration, and does not receive the synchronization signal sent by the base station or other terminal, the first duration When the subsequent second time period is cut off, the synchronization level 3 is entered.
  • the synchronization module is further configured to: if the receiving module of the terminal entering the synchronization level 1 receives the synchronization signal sent by the base station or other terminal, discard the base station or other terminal that sends the synchronization signal as a synchronization source Synchronize.
  • the terminal receives the timing signal of the UTC system, the UTC system is used as a synchronization source for clock synchronization, and enters the synchronization level 1; otherwise, if the first When the synchronization signal is received within the duration, the terminal or the base station transmitting the synchronization signal is clocked as a synchronization source according to the level of the synchronization signal. It can be seen that, according to different situations, the terminal can enter different synchronization levels to implement clock synchronization with different precisions.
  • the terminal receives the downlink pilot signal sent by the base station of the synchronization level 0, the base station of the synchronization level 0 is clocked as the synchronization source, and enters the synchronization level 1a; otherwise, if the other terminal is received within the first time period
  • the transmitted synchronization signal or the timing signal of the Coordinated Universal Time UTC system synchronizes the other terminals as a synchronization source or the UTC system as a synchronization source according to the synchronization level of the other terminals.
  • the other terminal is clocked as a synchronization source according to the synchronization level of the other terminal, including:
  • the terminal of the synchronization level 1a If the synchronization signal sent by the terminal of the synchronization level 1a is received within the first time period, the terminal of the synchronization level 1a is clocked as a synchronization source, and enters the synchronization level 3; or
  • the terminal of the synchronization level 1 is taken as Synchronize the source for clock synchronization and enter sync level 2; or,
  • the terminal of the synchronization level 2 is regarded as Synchronize the source for clock synchronization and enter sync level 3; or,
  • the clock synchronization is performed according to the synchronization signals of all the synchronization levels 3 received in the N synchronization periods, or the N synchronization periods are In the source terminal of the synchronization signal of the synchronization level 3 received, the terminal with the highest time is clocked as the synchronization source, and enters the synchronization level 3, where N is an integer greater than or equal to 1.
  • the UTC system is clocked as a synchronization source, including: if the terminal that does not receive the synchronization level 1a within the first time period transmits The synchronization signal, but receiving the timing signal of the UTC system, clocks the UTC system as a synchronization source and enters synchronization level 1.
  • the method further includes: if the synchronization signal sent by the base station or other terminal is not received within the first duration, the synchronization level 3 is entered when the second duration after the first duration is cut off.
  • the terminal provided by the embodiment of the second aspect of the present application includes: a receiving module and a synchronization module;
  • the synchronization module is configured to: when the receiving module receives the downlink pilot signal sent by the base station of the synchronization level 0, synchronize the base station of the synchronization level 0 as a synchronization source, and enter the synchronization level 1a; otherwise, If the receiving module receives the synchronization signal sent by another terminal or the timing signal of the Coordinated Universal Time UTC system within the first time period, the other terminal is used as a synchronization source or the UTC according to the synchronization level of the other terminal. The system synchronizes the clock as a synchronization source.
  • the synchronization module is specifically configured to:
  • the receiving module receives the synchronization signal sent by the terminal of the synchronization level 1a within the first time period, the terminal of the synchronization level 1a is clocked as a synchronization source, and enters the synchronization level 3; or
  • the receiving module receives only the synchronization signal sent by the terminal whose synchronization level is not higher than 1 in the first time period, and the terminal including the synchronization level 1 in the terminal whose synchronization level is not higher than 1, the synchronization level is The terminal of 1 performs clock synchronization as a synchronization source and enters synchronization level 2; or,
  • the receiving module receives only the synchronization signal sent by the terminal whose synchronization level is not higher than 2 within the first time period, and the terminal whose synchronization level is not higher than 2 includes the synchronization level 2, the synchronization level is The terminal of 2 performs clock synchronization as a synchronization source and enters synchronization level 3; or,
  • the clock synchronization is performed according to the synchronization signals of all the synchronization levels 3 received in the N synchronization periods, or the N is Among the source terminals of the synchronization signal of the synchronization level 3 received in the synchronization period, the terminal with the highest time is clocked as the synchronization source, and enters the synchronization level 3, where N is an integer greater than or equal to 1.
  • the synchronization module is specifically configured to: if the receiving module does not receive the synchronization signal sent by the terminal of the synchronization level 1a within the first time period, but receives the timing signal of the UTC system, the UTC system is used as The sync source is clocked and enters sync level 1.
  • the synchronization module is further configured to: if the receiving module does not receive the synchronization signal sent by the base station or other terminal within the first duration, enter the synchronization when the second duration after the first duration is cut off Level 3.
  • the base station when receiving the downlink pilot signal sent by the base station of the synchronization level 0, the base station is used as the synchronization source for clock synchronization, and enters the synchronization level 1a; otherwise, if Receiving the synchronization signal transmitted by the other terminal or the timing signal of the UTC system within the first time period, the other terminal is used as a synchronization source according to the synchronization level of the other terminal or the UTC system is used as a synchronization source for clock synchronization. It can be seen that, according to different situations, the terminal can enter different synchronization levels to implement clock synchronization with different precisions.
  • the embodiment of the present application further provides a clock synchronization method and device, which are used to reduce synchronization resource conflicts.
  • the terminal sends synchronization information in the determined synchronization subframe, and the transmitted synchronization information includes the acquired synchronization signal sequence.
  • the pre-configured synchronization signal sequence set includes N subsets, N is an integer greater than or equal to 3, and different synchronization levels correspond to different subsets;
  • the synchronization level of the terminal is 1, selecting a pre-agreed synchronization signal sequence from the subset corresponding to the synchronization level 1; or
  • a pre-agreed synchronization signal sequence is selected from the subset corresponding to the synchronization level 2;
  • a synchronization signal sequence is selected from the subset corresponding to the synchronization level 3, if the synchronization level of the terminal is 3, and clock synchronization with the synchronization source whose synchronization level is not lower than the synchronization level 3 enters the synchronization level 3, and acquires the synchronization signal sequence identical or corresponding to the synchronization signal sequence transmitted by the synchronization source according to the synchronization source.
  • the synchronization with the synchronization source is acquired according to the synchronization source.
  • the same or corresponding synchronization signal sequence of the signal sequence including:
  • the terminal according to the synchronization level 2 or the synchronization level 1a as the synchronization source is used.
  • the first synchronization signal sequence is sent, and the second synchronization signal sequence is selected from the subset corresponding to the synchronization level 3; wherein the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-agreed; or
  • the synchronization signal sequence transmitted by the terminal of the synchronization level 3 as the synchronization source is used as the The sequence of synchronization signals to be transmitted.
  • the first synchronization is sent according to the terminal of the synchronization level 1a as the synchronization source.
  • a signal sequence, the second synchronization signal sequence is selected from the subset corresponding to the synchronization level 3, and the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-configured or agreed;
  • the second synchronization signal sequence is transmitted in a synchronization subframe after the synchronization subframe occupied by the synchronization signal of the synchronization level 1a.
  • a synchronization period includes a first synchronization subframe, a second synchronization subframe, and a third synchronization subframe, and a total of three synchronization subframes, and the first synchronization subframe corresponds to synchronization level 1 and synchronization level 3, and the second synchronization sub-frame The frame corresponds to the synchronization level 2, and the third synchronization subframe corresponds to the synchronization level 3;
  • the determining, by the terminal, the synchronization subframe corresponding to the synchronization level of the terminal as the synchronization subframe of the synchronization information, according to the synchronization level of the terminal includes:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 3, and the synchronization signal sent by the terminal of the synchronization level 2 can be received, determining the third synchronization subframe as the synchronization subframe for transmitting the synchronization information; otherwise, determining the first synchronization subframe Or the third synchronization subframe is used as a synchronization subframe for transmitting synchronization information.
  • one synchronization period includes a first synchronization subframe and a second synchronization subframe, and two synchronization subframes, the first synchronization subframe corresponds to synchronization level 1 and synchronization level 3, and the second subframe corresponds to synchronization level 2 and synchronization. Level 3;
  • the determining, by the terminal, the synchronization subframe corresponding to the synchronization level of the terminal as the synchronization subframe of the synchronization information, according to the synchronization level of the terminal includes:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 3, and the synchronization signal sent by the terminal of the synchronization level 2 can be received, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; otherwise, determining the first synchronization subframe Or the second subframe is a synchronization subframe that transmits synchronization information.
  • a synchronization period includes a first synchronization subframe and a second synchronization subframe, and two synchronization subframes, the first synchronization subframe corresponds to synchronization level 1, and the second synchronization subframe corresponds to synchronization level 2;
  • the determining, by the terminal, the synchronization subframe corresponding to the synchronization level of the terminal as the synchronization subframe of the synchronization information, according to the synchronization level of the terminal includes:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization information is discarded.
  • the preset synchronization signal sequence set includes N subsets, N is an integer greater than or equal to 3, and different synchronization levels correspond to different subsets;
  • the broadcast message sent by the base station carries indication information of a synchronization signal sequence, where:
  • the synchronization signal sequence corresponding to the synchronization level 1 or the synchronization level 1a is selected from the subset corresponding to the synchronization level 1;
  • the synchronization signal sequence corresponding to the synchronization level 2 is selected from the subset corresponding to the synchronization level 2;
  • the synchronization signal sequence corresponding to the synchronization level 3 is selected from the subset corresponding to the synchronization level 3.
  • the number of subsets included in the pre-configured synchronization signal sequence set is three, and the three subsets respectively correspond to synchronization level 1, synchronization level 2, and synchronization level 3, and the synchronization level sequence corresponding to the synchronization level 3 Number
  • the quantity is not less than the number of synchronization signal sequences in the subset corresponding to the synchronization level 2; or
  • the pre-configured synchronization signal sequence set includes a first subset and a second subset, the first subset includes two subsets, respectively corresponding to synchronization level 1 and synchronization level 2, and the second subset corresponds to synchronization level 3,
  • the number of synchronization sequences of the two subsets is not less than the number of synchronization signal sequences in the first subset.
  • the synchronization information sent by the terminal further includes PBSCH content; wherein, if the terminal receives the broadcast message sent by the base station, the PBSCH content sent by the terminal is obtained from the broadcast message, otherwise, The PBSCH content sent by the terminal is pre-configured; or,
  • the synchronization information sent by the terminal further includes PBSCH content; wherein, if the terminal does not receive the broadcast message sent by the base station and does not receive the synchronization signal sent by the terminal of the synchronization level 1a, the PBSCH content sent by the terminal Pre-configured, if the terminal does not receive the broadcast message of the base station but receives the synchronization signal sent by the terminal of the synchronization level 1a, the PBSCH content sent by the terminal is the synchronization information sent from the terminal of the synchronization level 1a. If the terminal receives the broadcast message sent by the base station, the PBSCH content sent by the terminal is obtained from the broadcast message sent by the base station.
  • the method further includes: if the terminal detects that the synchronization resource used by the terminal conflicts with the synchronization resource used by another terminal, the terminal selects a new idle subframe to send synchronization information.
  • the terminal receives the downlink pilot signal sent by the base station of the synchronization level 0, the base station of the synchronization level 0 is used as the synchronization source for clock synchronization, and enters the synchronization level 1a; otherwise, If the synchronization signal transmitted by another terminal or the timing signal of the UTC system is received within the first time period, the other terminal or the UTC system is clocked as a synchronization source. It can be seen that, according to different situations, the terminal can enter different synchronization levels to implement clock synchronization with different precisions.
  • An acquiring module configured to acquire a synchronization signal sequence to be sent; wherein, if the terminal receives the broadcast message sent by the base station, acquiring a synchronization signal sequence according to the broadcast message, otherwise, pre-configuring according to the synchronization level of the terminal Acquiring a synchronization signal sequence in the set of synchronization signal sequences;
  • a determining module configured to determine, according to a synchronization level of the terminal, a synchronization subframe that sends synchronization information
  • a sending module configured to send synchronization information in the determined synchronization subframe, where the sent synchronization information includes the acquired synchronization signal sequence.
  • the pre-configured synchronization signal sequence set includes N subsets, N is an integer greater than or equal to 3, and different synchronization levels correspond to different subsets;
  • the obtaining module is specifically configured to:
  • the synchronization level of the terminal is 1, selecting a pre-agreed synchronization signal sequence from the subset corresponding to the synchronization level 1; or
  • a pre-agreed synchronization is selected from the subset corresponding to the synchronization level 2 Signal sequence; or,
  • a synchronization signal sequence is selected from the subset corresponding to the synchronization level 3, if the synchronization level of the terminal is 3, and clock synchronization with the synchronization source whose synchronization level is not lower than the synchronization level 3 enters the synchronization level 3, and acquires the synchronization signal sequence identical or corresponding to the synchronization signal sequence transmitted by the synchronization source according to the synchronization source.
  • the obtaining module is specifically configured to:
  • the terminal according to the synchronization level 2 or the synchronization level 1a as the synchronization source is used.
  • the first synchronization signal sequence is sent, and the second synchronization signal sequence is selected from the subset corresponding to the synchronization level 3; wherein the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-agreed; or
  • the synchronization signal sequence transmitted by the terminal of the synchronization level 3 as the synchronization source is used as the The sequence of synchronization signals to be transmitted.
  • the obtaining module is specifically configured to:
  • the first synchronization signal sequence transmitted according to the terminal of the synchronization level 1a as the synchronization source And selecting a second synchronization signal sequence from the subset corresponding to the synchronization level 3, where the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-configured or agreed;
  • the determining module is specifically configured to: when determining a synchronization subframe for transmitting synchronization information, determine a synchronization subframe subsequent to the synchronization subframe occupied by the synchronization signal of the synchronization level 1a, and determine a synchronizer that sends synchronization information for the terminal. frame.
  • a synchronization period includes a first synchronization subframe, a second synchronization subframe, and a third synchronization subframe, and a total of three synchronization subframes, and the first synchronization subframe corresponds to synchronization level 1 and synchronization level 3, and the second synchronization sub-frame The frame corresponds to the synchronization level 2, and the third synchronization subframe corresponds to the synchronization level 3;
  • the determining module is specifically configured to:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 3, and the synchronization signal sent by the terminal of the synchronization level 2 can be received, determining the third synchronization subframe as the synchronization subframe for transmitting the synchronization information; otherwise, determining the first synchronization subframe Or the third synchronization subframe is used as a synchronization subframe for transmitting synchronization information.
  • one synchronization period includes a first synchronization subframe and a second synchronization subframe, and two synchronization subframes, the first synchronization subframe corresponds to synchronization level 1 and synchronization level 3, and the second subframe corresponds to synchronization level 2 and synchronization. Level 3;
  • the determining module is specifically configured to:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 3, and the synchronization signal sent by the terminal of the synchronization level 2 can be received, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; otherwise, determining the first synchronization subframe Or the second subframe is a synchronization subframe that transmits synchronization information.
  • a synchronization period includes a first synchronization subframe and a second synchronization subframe, and two synchronization subframes, the first synchronization subframe corresponds to synchronization level 1, and the second synchronization subframe corresponds to synchronization level 2;
  • the determining module is specifically configured to:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization information is discarded.
  • the preset synchronization signal sequence set includes N subsets, N is an integer greater than or equal to 3, and different synchronization levels correspond to different subsets;
  • the broadcast message sent by the base station carries indication information of a synchronization signal sequence, where:
  • the synchronization signal sequence corresponding to the synchronization level 1 or the synchronization level 1a is selected from the subset corresponding to the synchronization level 1;
  • the synchronization signal sequence corresponding to the synchronization level 2 is selected from the subset corresponding to the synchronization level 2;
  • the synchronization signal sequence corresponding to the synchronization level 3 is selected from the subset corresponding to the synchronization level 3.
  • the number of subsets included in the set of pre-configured synchronization signal sequences is three, and the three subsets respectively correspond to synchronization level 1, synchronization level 2, and synchronization level 3, and synchronization level sequence corresponding to synchronization level 3
  • the number is not less than the number of synchronization signal sequences in the subset corresponding to the synchronization level 2; or
  • the pre-configured synchronization signal sequence set includes a first subset and a second subset, the first subset includes two subsets, respectively corresponding to synchronization level 1 and synchronization level 2, and the second subset corresponds to synchronization level 3,
  • the number of synchronization sequences of the two subsets is not less than the number of synchronization signal sequences in the first subset.
  • the synchronization information sent by the sending module further includes PBSCH content; wherein, if the terminal receives the broadcast message sent by the base station, the PBSCH content sent by the sending module is obtained from the broadcast message, Otherwise, the PBSCH content sent by the sending module is pre-configured; or,
  • the synchronization information sent by the sending module further includes PBSCH content; wherein, if the terminal does not receive the broadcast message sent by the base station and does not receive the synchronization signal sent by the terminal of the synchronization level 1a, the sending module sends The PBSCH content is pre-configured. If the terminal does not receive the broadcast message of the base station but receives the synchronization signal sent by the terminal of the synchronization level 1a, the PBSCH content sent by the sending module is the terminal from the synchronization level 1a. If the terminal receives the broadcast message sent by the base station, the content of the PBSCH sent by the sending module is obtained from the broadcast message sent by the base station.
  • the determining module is further configured to: if detecting that the synchronization resource used by the terminal conflicts with the synchronization resource used by another terminal, select a new idle subframe to send synchronization information.
  • the terminal when the terminal acquires the synchronization signal sequence to be transmitted, if the terminal receives the broadcast message sent by the base station, the terminal acquires the synchronization signal sequence according to the broadcast message. Otherwise, the synchronization signal sequence is acquired from the pre-configured synchronization signal sequence set according to the synchronization level of the terminal, so that the synchronization signal sequence that the terminal needs to transmit is determined according to the network coverage of the terminal; on the other hand, the terminal determines the synchronization of the transmission synchronization information.
  • the synchronization subframe used may be determined according to its own synchronization level determination, that is, there may be a correspondence between the synchronization level and the synchronization subframe, so that terminals of different synchronization levels may use different synchronization subframes.
  • FIG. 1 is a schematic flowchart of a clock synchronization scheme 1 according to an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of a clock synchronization scheme 2 according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a synchronization information transmission process according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of frequency domain resources occupied by synchronization information according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • clock synchronization is of great significance to the communication network.
  • the cellular coverage of the terminal is various, so the impact of the clock synchronization scheme on the communication performance is more important. .
  • the vehicle networking system uses the vehicle as the basic information unit, and uses advanced sensing technology, information acquisition technology, access technology, transmission technology, and networking technology to comprehensively implement roads and traffic. Perception, the realization of large-scale, large-capacity data interaction between multiple systems to provide traffic efficiency and traffic safety networks and applications.
  • the Internet of Vehicles has node characteristics, mobility characteristics, and data flow characteristics. Its mobile characteristics are characterized by fast changes in network topology and fast node movement.
  • some terminals may be in the coverage of the cellular, some of the terminals are outside the cellular coverage, and some of the terminals are at the edge of the cellular coverage, and there may be an inner coverage terminal, a partial coverage terminal, and an outer coverage terminal.
  • the relevant explanations of the coverage terminal, the partial coverage terminal, and the coverage external terminal are as follows:
  • An in-coverage terminal of a cellular network can successfully demodulate broadcast messages of the cellular network.
  • a partial coverage terminal of a cellular network cannot successfully demodulate the broadcast message of the cellular network, but can receive the synchronization signal transmitted by the terminal within the coverage of the cellular network and can successfully demodulate the terminal within the coverage of the cellular network The physical broadcast channel sent.
  • an out-of-coverage terminal an out-of-band terminal of a cellular network cannot successfully demodulate the broadcast message of the cellular network, nor can it receive the synchronization signal transmitted by the terminal within the coverage of the cellular network or cannot successfully demodulate the terminal in the coverage of the cellular network.
  • the case where the out-of-band terminal receives the synchronization information may include: only receiving the synchronization signal and the physical broadcast channel transmitted by the partial coverage terminal, or only receiving the synchronization signal and the physical broadcast channel transmitted by the external terminal, or unable to receive any The synchronization signal and physical broadcast channel transmitted by the terminal.
  • the embodiment of the present application provides a "clock synchronization scheme” and a “synchronization information transmission scheme”, wherein the "clock synchronization scheme” gives the definition of the synchronization level and how to perform clock synchronization, and the "synchronization information transmission scheme” gives the terminal how to Determine the content of the synchronization information that needs to be sent, and how to allocate the transmission resources of the synchronization information.
  • the above two schemes may be independent of each other (for example, the definition of the synchronization level involved in the "synchronous information transmission scheme” may be different from the definition of the synchronization level in the "clock synchronization scheme"), or may be related (such as "synchronous information transmission”
  • the definition of the synchronization level involved in the scheme is the same as the definition of the synchronization level in the "clock synchronization scheme”).
  • the synchronization of the subframe level may be implemented according to the “clock synchronization scheme”, and then the synchronization information is transmitted according to the “synchronization information transmission scheme”.
  • the "clock synchronization scheme” and the “synchronous information transmission scheme” are described below.
  • the embodiments of the present application are applicable to different types of communication systems that require clock synchronization, and are particularly applicable to a system architecture in which a D2D communication system and a cellular communication system are combined.
  • the specific implementation process of the embodiment of the present application is described in the scenario of the combination of the D2D communication system and the cellular communication. If not specifically stated, the terminals involved in the following embodiments are all D2D. terminal. Of course, the specific implementation described below is also applicable to other types or architectures of communication systems.
  • the clock synchronization scheme provided by the embodiment of the present application is first described below.
  • the embodiments of the present application provide two clock synchronization schemes (such as the clock synchronization scheme 1 and the clock synchronization scheme 2 described below), and different clock synchronization schemes provide different synchronization level definitions and clock synchronization modes.
  • the base station can indicate which clock synchronization scheme the terminal adopts, and the terminal can also adopt a clock synchronization scheme agreed by the system according to the system agreement.
  • the base station may send an enable flag to the terminal through a broadcast message, and the enable flag is used to indicate which clock synchronization scheme the terminal adopts.
  • synchronization level 0 may be exclusive to the base station, and the synchronization level 1 and the synchronization level 2 may be terminal-specific, and the synchronization level 3 may be used for the base station or the terminal.
  • the higher the synchronization level the higher the synchronization accuracy.
  • the base station performs clock synchronization with the Universal Time Coordinated (UTC) system, and can broadcast the offset of the downlink pilot signal and the UTC clock, for example, the downlink synchronization clock and the UTC clock can be notified through the system broadcast message.
  • the offset of the base station is characterized by high stability and high transmission power of the base station. Therefore, the base station can provide a synchronization source with a large coverage and high stability for the terminal under the cellular coverage.
  • the synchronization level of the base station is defined as level 0.
  • the synchronization level of the terminal is the synchronization level 1.
  • the terminal entering the synchronization level 1 receives the synchronization signal transmitted by the base station or other terminal, it abandons the base station or other terminal that transmits the synchronization signal as the synchronization source for clock synchronization. That is to say, a terminal that can obtain a UTC clock through a UTC timing system such as a satellite does not need to obtain its transmission clock through a base station, and only a UTC timing system such as a satellite is used as its clock source.
  • the terminal receives the downlink pilot signal sent by the base station of the synchronization level 0, and the terminal will The base station as a synchronization source performs clock synchronization on the basis of timing compensation based on distance calibration or uplink synchronization calibration, and the synchronization level of the terminal is synchronization level 2.
  • the timing compensation enable flag is configured on the terminal.
  • the timing compensation enable flag is described as TC.
  • the TC may be configured by the base station to the terminal, or may be agreed by the system.
  • the synchronization level of the terminal is 2; otherwise, if the terminal cannot perform clock synchronization based on the above timing compensation, the base station of the synchronization level 0 is used as a synchronization source to perform a general clock. Synchronization (that is, the timing compensation is not performed), the synchronization level of the terminal is 3;
  • the terminal synchronizes the base station of the synchronization level 0 as a synchronization source, and the synchronization level of the terminal is 2.
  • the timing compensation method may include timing compensation based on distance calibration and timing compensation based on uplink synchronization calibration.
  • the synchronization level of the terminal is the synchronization level 2.
  • the base station For the base station, if the base station is not clocked with the UTC system or cannot obtain its own location, the base station has a synchronization level of 3.
  • the global navigation satellite system (GNSS; also known as the global satellite navigation system) can be placed near the radio frequency antenna of the base station, so that the location information can be obtained through the GNSS. If the base station does not have a device such as GNSS, it cannot obtain its own location information.
  • the timing compensation enable flag TC is configured on the terminal, if the terminal receives the downlink pilot signal transmitted by the base station of the synchronization level 0, if the timing compensation is enabled, if the terminal cannot The clock synchronization is performed based on the above-mentioned timing compensation, and the base station of the synchronization level 0 is used as a synchronization source.
  • the clock synchronization ie, the timing compensation is not performed
  • the synchronization level of the terminal is 3.
  • the synchronization level of the terminal is the synchronization level 3.
  • the terminal In another scenario, if the terminal only receives the synchronization signal of the synchronization level 3, and performs self-synchronization according to the synchronization signals of the synchronization level 3 received in the N (N is an integer greater than or equal to 1) synchronization period, Then, the synchronization level of the terminal is synchronization level 3.
  • the synchronization signal of the synchronization level 3 includes a synchronization signal sent by the terminal of the synchronization level 3 and/or the base station of the synchronization level 3.
  • the self-synchronizing manner may include the following two types:
  • Self-synchronization method 1 The result of weighting and summing the reception clocks of the synchronization signals of all the synchronization levels 3 received in the above-described N synchronization periods as the transmission clock.
  • the terminal i receives the synchronization signals sent by the K synchronization level 3 terminals, and the terminal i uses the 1 ms data transmission starting point T of the terminal as a reference, and uses other terminals 1 ms data.
  • the receiving start point Tx is different from T, and the difference is compared with 1ms to obtain a normalized clock tx of the terminal of the K synchronization level 3 (ie, t1, t2, t3, ... tk, where terminal i
  • the terminal i calculates the transmission clock adjustment amount ⁇ i of the own terminal according to the following formula, thereby adjusting the local clock of the terminal i according to ⁇ i:
  • ax is the weight of the clock adjustment amount
  • ax can be the received power of the corresponding synchronization signal.
  • A0 can take Where R ⁇ 0, the clock adjustment rate of the terminal can be controlled by R, and the specific value can be determined by simulation.
  • the transmission clock of the terminal i is adjusted in the above manner every N synchronization periods, and the clock adjustment of the terminal can be further controlled by the value of R.
  • the rate so that the clock synchronization accuracy can be improved as much as possible without obtaining a high synchronization level synchronization source.
  • Self-synchronization method 2 Among the source terminals of the synchronization signal of the synchronization level 3 received in the above-described N synchronization periods, the terminal with the highest time is clocked as the synchronization source.
  • the terminal does not receive the synchronization signal sent by the base station or other terminal, after delaying for a period of time after the set duration, the synchronization level 3 is entered.
  • the length of time required for the delay may be pre-agreed or configured by the base station, and the value of the length of time may be determined as needed or by system simulation or experience.
  • the clock synchronization is performed according to the following principle: when the terminal of the low synchronization level receives the synchronization of the high synchronization level In the case of a signal, clock synchronization is performed based on the received synchronization signal of a high synchronization level. For example, the reception clock of the synchronization signal of the high synchronization level is used as the transmission clock of the terminal.
  • the timing synchronization based on the distance calibration or the uplink synchronization calibration is performed on the received synchronization signal of the high synchronization level, and the reception clock of the synchronization signal of the high synchronization level after the timing compensation is used as the transmission clock of the terminal.
  • the terminal receives the downlink pilot signal sent by the base station of the synchronization level 0 and receives the synchronization signal sent by the terminal of the synchronization level 1 if the terminal cannot receive the timing signal of the UTC system, the terminal takes precedence.
  • the base station of the synchronization level 0 is clocked as a synchronization source to enter the synchronization level 2.
  • the terminal of the synchronization level 1 is used as the synchronization source for clock synchronization.
  • FIG. 1 shows an implementation flow of the clock synchronization scheme one.
  • the terminal receives the timing signal of the UTC system
  • the UTC system is used as a synchronization source for clock synchronization and enters the synchronization level 1; otherwise, if the first time is When the synchronization signal is received, the terminal or the base station that transmits the synchronization signal is clocked as a synchronization source according to the level of the synchronization signal.
  • step 101 when the terminal is powered on, the timer d1 is started, and the timer duration of the timer d1 is t1 (that is, the first duration).
  • the UTC system If the timing signal of the UTC system is received, the UTC system is clocked as a synchronization source and enters synchronization level 1 (see steps 102 to 103);
  • the terminal of the synchronization level 1 is clocked as a synchronization source, and the synchronization level 2 is entered (see steps 108 to 109);
  • the terminal of the synchronization level 2 is clocked as a synchronization source, and the synchronization level 3 is entered (please refer to step 110 to step 111);
  • the base station of the synchronization level 3 is clocked as a synchronization source, and enters the synchronization level 3 (see steps 112 to 113);
  • the terminal according to the synchronization level 3 performs self-synchronization and enters the synchronization level 3 (see steps 114 to 115);
  • the timer d2 is started after the timer d1 times out, and the synchronization level 3 is entered after the timer d2 times out (see steps 116 to 117).
  • steps 112 to 115 in the above process may also be described as follows: if the terminal receives the synchronization signal of the synchronization level 3, the synchronization signal of the synchronization level 3 is derived from the base station or from other terminals. Synchronize the clock for synchronization and enter sync level 3.
  • the terminal receives the timing signal of the UTC system, the UTC system is used as a synchronization source for clock synchronization and enters the synchronization level 1; otherwise, if it receives within the first duration To the synchronization signal, the terminal or the base station transmitting the synchronization signal is clocked as a synchronization source according to the level of the synchronization signal. It can be seen that, according to different situations, the terminal can enter different synchronization levels to implement clock synchronization with different precisions.
  • synchronization levels are defined in the clock synchronization scheme 2. According to the order of synchronization level from high to low, the five synchronization levels are respectively called: synchronization level 0, synchronization level 1a, synchronization level 1, synchronization level 2, and synchronization level 3. .
  • the synchronization level 0 may be exclusive to the base station, and the synchronization level 1a, the synchronization level 1, the synchronization level 2, and the synchronization level 3 may be terminal-specific. In general, the higher the synchronization level, the higher the synchronization accuracy.
  • the synchronization level 1 is referred to as a first synchronization level
  • the synchronization level 2 is referred to as The second synchronization level, and so on, will not be enumerated here.
  • the synchronization level of the base station is configured by default to synchronization level 0.
  • the synchronization level of the terminal is the synchronization level 1a.
  • the terminal cannot receive the downlink pilot signal sent by the base station of the synchronization level 0, but receives the synchronization signal sent by the terminal of the synchronization level 1a, and the terminal of the synchronization level 1a is clocked as the synchronization source. Synchronization, the synchronization level of the terminal is synchronization level 1.
  • the terminal does not receive the synchronization signal sent by the terminal of the synchronization level 1a, but receives the timing signal of the UTC system, and performs clock synchronization on the UTC system as the synchronization source, the synchronization level of the terminal. For synchronization level 1.
  • the terminal includes a synchronization level 1 terminal), for example, a synchronization signal transmitted by a terminal that has not received the synchronization level 1a, but receives a synchronization signal transmitted by the terminal of the synchronization level 1, and the terminal uses the terminal of the synchronization level 1 as When the synchronization source is clocked, the synchronization level of the terminal is synchronization level 2.
  • the synchronization level of the terminal is the synchronization level 3.
  • the terminal only receives the synchronization signal sent by the terminal whose synchronization level is not higher than 2 (the terminal including the synchronization level 2 in the terminal whose synchronization level is not higher than 2), for example, the synchronization is not received.
  • the synchronization signal transmitted by the terminal of level 1a or synchronization level 1 is received, but the synchronization signal transmitted by the terminal of synchronization level 2 is received, and the terminal of the synchronization level 2 is clocked as the synchronization source, the synchronization level of the terminal is synchronization.
  • Level 3 the terminal only receives the synchronization signal sent by the terminal whose synchronization level is not higher than 2 (the terminal including the synchronization level 2 in the terminal whose synchronization level is not higher than 2)
  • the terminal only receives the synchronization signal sent by the terminal of the synchronization level 3
  • the synchronization signal according to the synchronization level 3 received in the synchronization period of N (N is an integer greater than or equal to 1) is performed. Synchronize and enter sync level 3.
  • the terminal does not receive the synchronization signal sent by the base station or other terminal, after delaying for a period of time after the set duration, the synchronization level 3 is entered.
  • the length of time required for the delay may be pre-agreed or configured by the base station, and the value of the length of time may be determined as needed or by system simulation or experience.
  • the clock synchronization is performed according to the following principle: when the terminal of the low synchronization level receives the synchronization signal of the high synchronization level, according to the reception
  • the synchronization signal of the high synchronization level is clocked, for example, the reception clock of the synchronization signal of the high synchronization level is used as the transmission clock of the terminal.
  • the timing synchronization based on the distance calibration or the uplink synchronization calibration is performed on the received synchronization signal of the high synchronization level, and the reception clock of the synchronization signal of the high synchronization level after the timing compensation is used as the transmission clock of the terminal.
  • FIG. 2 shows an implementation flow of the clock synchronization scheme 2.
  • the base station of the synchronization level 0 is used as the synchronization source for clock synchronization, and enters the synchronization level. 1a; otherwise, if the synchronization signal sent by another terminal or the timing signal of the UTC system is received within the first time period, the other terminal is used as a synchronization source or the UTC system is synchronized according to the synchronization level of the other terminal.
  • the source is clock synchronized.
  • step 201 when the terminal is powered on, the timer d1 is started, and the timer duration of the timer d1 is t1 (ie, the first duration). It should be noted that the definition of the timer d1 and the first duration herein is limited to the clock synchronization scheme 2.
  • the base station If the downlink pilot signal sent by the base station of the synchronization level 0 is received, the base station is clocked as a synchronization source, and enters the synchronization level 1a (see steps 202 to 203);
  • the terminal of the synchronization level 1a is clocked as a synchronization source, and the synchronization level 3 is entered (see steps 204 to 205);
  • the UTC system is clocked as a synchronization source, and enters synchronization level 1 (see steps 206 to 207);
  • the terminal of the synchronization level 1 is clocked as a synchronization source, and the synchronization level 2 is entered (see steps 208 to 209);
  • the terminal of the synchronization level 2 is clocked as a synchronization source, and the synchronization level 3 is entered (see steps 210 to 211);
  • the terminal according to the synchronization level 3 performs self-synchronization and enters the synchronization level 3 (see steps 212 to 213);
  • the timer d2 is started after the timer d1 times out, and the synchronization level 3 is entered after the timer d2 times out (see steps 214 to 215).
  • the terminal receives the downlink pilot signal sent by the base station of the synchronization level 0, the base station of the synchronization level 0 is used as the synchronization source for clock synchronization, and enters the synchronization level 1a; otherwise If the synchronization signal sent by another terminal or the timing signal of the UTC system is received within the first time period, the other terminal or the UTC system is clocked as a synchronization source. It can be seen that, according to different situations, the terminal can enter different synchronization levels to implement clock synchronization with different precisions.
  • FIG. 3 is a schematic diagram of a synchronization information transmission process provided by an embodiment of the present application, where the process may include:
  • Step 301 The terminal acquires a synchronization signal sequence to be sent. If the terminal receives the broadcast message sent by the base station, the terminal acquires the synchronization signal sequence according to the broadcast message. Otherwise, the pre-configured synchronization signal sequence set is obtained according to the synchronization level of the terminal. Get the synchronization signal sequence.
  • a synchronization signal sequence set may be configured in advance on the base station side and the terminal side, and the set includes a plurality of synchronization signal sequences.
  • the set may contain N (N is an integer greater than or equal to 3) subset, and different synchronization levels correspond to different subsets.
  • Step 302 The terminal determines a synchronization subframe for transmitting synchronization information according to the synchronization level of the terminal.
  • a synchronization period may be pre-defined to include two or more synchronization subframes, and a synchronization level corresponding to each synchronization subframe is specified, and one synchronization subframe may correspond to one or more synchronization levels, and different The synchronization level or synchronization level combination corresponding to the synchronization subframe is different from each other.
  • the terminal can determine the synchronization subframe for transmitting the synchronization information according to its own synchronization level, so that the terminal used by the synchronization level information can be synchronized by the terminal of different synchronization levels.
  • Frames are as orthogonal as possible in the time domain, thereby reducing or avoiding synchronization resource conflicts between terminals of different synchronization levels.
  • Step 303 The terminal sends synchronization information in the determined synchronization subframe, where the sent synchronization information includes the acquired synchronization signal sequence. Further, the synchronization information sent by the terminal may further include a Physical Broadcast Shared Channel (PBSCH) content.
  • PBSCH Physical Broadcast Shared Channel
  • the terminal can use the synchronization signal and the PBSCH to implement time and frequency estimation and can be further used for data demodulation.
  • the PBSCH can be used to convey some system level information, such as D2D Frame Number (DFN), synchronization status, setting information (such as channel bandwidth, etc.).
  • D2D Frame Number D2D Frame Number
  • synchronization status synchronization status
  • setting information such as channel bandwidth, etc.
  • the content included in the PBSCH may include:
  • -TDD UL-DL config Time Division Duplex (TDD) uplink and downlink configuration: 3 bits; for Frequency Division Duplex (FDD) system, these 3 bits are set to 000;
  • SIB System Information Block
  • the above process can be applied to the foregoing clock synchronization scheme 1 or to the foregoing clock synchronization scheme 2.
  • the synchronization level involved in the process may be defined according to the definition of the synchronization level in the foregoing clock synchronization scheme 1; if applicable to the foregoing clock synchronization scheme 2, the flow
  • the synchronization level involved in the definition can be explained in accordance with the definition of the synchronization level in the aforementioned clock synchronization scheme 2.
  • the process may also be independent of the foregoing clock synchronization scheme 1 and independent of the foregoing clock synchronization scheme 2.
  • the synchronization level involved in the process may be defined according to the clock synchronization scheme applicable to the process. The definition of the relevant synchronization level is explained.
  • the terminal cannot receive the broadcast message of the base station, such as a vehicle to vehicle (V2V) message;
  • V2V vehicle to vehicle
  • the terminal can receive the broadcast message of the base station.
  • Scenario 1 The terminal cannot receive the broadcast message of the base station.
  • a synchronization signal (such as a SLS (Side Link Synchronization Signal)) sequence set can be divided into three subsets: SLSS subset 1, SLSS subset 2, and SLSS subset 3.
  • the number of SLSS sequences included in the SLSS subset 3 is not less than the number of SLSS sequences included in the SLSS subset 2.
  • These three subsets correspond to synchronization level 1, synchronization level 2, and synchronization level 3, respectively.
  • the terminal determines the sequence of synchronization signals to be transmitted according to the following principles:
  • the synchronization level 1 terminal selects a specific SLSS sequence from the SLSS subset 1.
  • the SLSS sequence with the index number SLSS10 may be selected from the SLSS subset 1 for the synchronization level 1 terminal (SLSS subset 1)
  • Each SLSS sequence is identified by a unique index number);
  • the synchronization level 2 terminal selects a specific SLSS sequence from the SLSS subset 2, for example, the SLSS sequence with the index number SLSS20 may be selected from the SLSS subset 2 for the synchronization level 2 terminal (SLSS subset 2)
  • SLSS subset 2 Each SLSS sequence is identified by a unique index number
  • the terminal of synchronization level 3 can include two cases:
  • the terminal selects one SLSS sequence from the SLSS subset 3, such as a random SLSS subset 3 a SLSS sequence;
  • the terminal of the synchronization level 3 if the terminal of the synchronization level 3 is clocked into the synchronization level 3 with the synchronization source whose synchronization level is not lower than the synchronization level 3, the terminal acquires the same or corresponding sequence of the synchronization signal transmitted by the synchronization source according to the synchronization source. Synchronization signal sequence.
  • the terminal A synchronizes the clock of the synchronization level 3 as the synchronization source into the synchronization level 3, the terminal A uses the SLSS sequence sent by the terminal B as the SLSS sequence that the terminal A needs to send; if the terminal A is When the terminal C with the synchronization level 2 is clocked as the synchronization source and enters the synchronization level 3, the terminal A selects a corresponding SLSS sequence from the SLSS subset 3 as the terminal A needs to send according to the SLSS sequence sent by the terminal C.
  • the SLSS sequence may be pre-agreed. As an example, if the index number of the SLSS sequence sent by the terminal C in the SLSS subset 2 is SLSS2n, the terminal A selects the SLSS sequence of the same index number from the SLSS subset 3.
  • the SLSS sequence set can be divided into two subsets: SLSS subset 1, SLSS subset 2, and SLSS subset 1 is further divided into subset 1a and subset 1b.
  • the number of SLSS sequences included in the subset 2 is not less than the number of SLSS sequences in the subset 1.
  • Subset 1a corresponds to synchronization level 1
  • subset 1b corresponds to synchronization level 2
  • SLSS subset 2 corresponds to synchronization level 3.
  • the principle by which the terminal determines the synchronization signal sequence to be transmitted is as described above, and is not repeated here, but only because the correspondence between the synchronization level and the subset in the SLSS sequence set is different.
  • the SLSS sequence needs to be selected from the corresponding subset according to the corresponding relationship agreed in the case.
  • three subframes are reserved as a synchronization subframe in one synchronization period, and the synchronization subframe can be transmitted.
  • Synchronization information (such as synchronization pilot and broadcast messages), these three synchronization subframes may be continuous or discontinuous in the time domain.
  • a synchronization period is 40 ms. The embodiment of the present application does not limit the length of the synchronization period.
  • the three synchronization subframes can be represented as: a first synchronization subframe, a second synchronization subframe, and a third synchronization subframe.
  • the "first synchronization subframe” does not mean “first synchronization subframe”, it may be any one of the three synchronization subframes, where "first”, “second”, “Third” is only used to distinguish between sync subframes and does not represent other meanings.
  • the terminal may determine the synchronization subframe that is used to send the synchronization information according to the synchronization level of the terminal itself, and may specifically include the following situations:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information;
  • the third synchronization subframe is used as a synchronization subframe for transmitting synchronization information (such as randomly selecting one synchronization subframe from the first synchronization subframe and the third synchronization subframe).
  • two subframes are reserved as a synchronization subframe in one synchronization period, and the synchronization subframe may transmit synchronization information (including, for example, a synchronization pilot and a broadcast message), and the two synchronization subframes are in time.
  • the domain can be continuous or discontinuous.
  • a synchronization period is 40 ms. The embodiment of the present application does not limit the length of the synchronization period.
  • the two synchronization subframes can be represented as: a first synchronization subframe and a second synchronization subframe.
  • the “first synchronization subframe” does not mean “first synchronization subframe”, and it may be any one of the two synchronization subframes, where “first” and “second” are only Used to distinguish between synchronization subframes does not mean other meanings.
  • the terminal may determine the synchronization subframe that is used to send the synchronization information according to the synchronization level of the terminal itself, and may specifically include the following situations:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information;
  • the second synchronization subframe is used as a synchronization subframe for transmitting synchronization information (such as randomly selecting one synchronization subframe from the first synchronization subframe and the second synchronization subframe).
  • two subframes are reserved as a synchronization subframe in one synchronization period, and the synchronization subframe may transmit synchronization information (including, for example, a synchronization pilot and a broadcast message), and the two synchronization subframes are in time.
  • the domain can be continuous or discontinuous.
  • a synchronization period is 40 ms.
  • the embodiment of the present application does not limit the length of the synchronization period.
  • the two synchronization subframes can be represented as: a first synchronization subframe and a second synchronization subframe.
  • the “first synchronization subframe” does not mean “first synchronization subframe”, and it may be any one of the two synchronization subframes, where “first” and “second” are only Used to distinguish between synchronization subframes does not mean other meanings.
  • the terminals of the synchronization level 1 and the synchronization level 2 can determine the synchronization subframes they use to transmit the synchronization information according to the synchronization level of the terminal itself.
  • the synchronization subframe for transmitting the synchronization information cannot be determined, and thus the synchronization information is discarded.
  • FIG. 4 exemplarily shows a schematic diagram of a frequency domain resource occupied by synchronization information.
  • the terminal may acquire the predefined PBSCH content, and the predefined PBSCH content and the SLSS sequence. Together sent in a sync subframe.
  • the terminal can receive the broadcast message of the base station.
  • the synchronization signal (such as SLSS) sequence set can be divided into three subsets in the foregoing manner: SLSS subset 1, SLSS subset 2, SLSS subset 3. These three subsets correspond to synchronization level 1, synchronization level 2, and synchronization level 3, respectively.
  • the broadcast message sent by the base station may carry the indication information of the synchronization signal sequence corresponding to the synchronization level, which may specifically include the following situations:
  • the SLSS sequence corresponding to the synchronization level 1 is selected from the SLSS subset 1.
  • the SLSS sequence with the index number SLSS10 may be selected from the SLSS subset 1 for the synchronization level 1 (each of the SLSS subsets 1) SLSS sequences are identified by a unique index number);
  • the SLSS sequence corresponding to the synchronization level 2 is selected from the SLSS subset 2.
  • the SLSS sequence with the index number SLSS20 may be selected from the SLSS subset 2 for the synchronization level 2 (each of the SLSS subsets 2) SLSS sequences are identified by a unique index number);
  • the SLSS sequence corresponding to the synchronization level 3 is selected from the SLSS subset 3.
  • the SLSS sequence with the index number SLSS30 may be selected from the SLSS subset 3 for the terminal of the synchronization level 3 (in the SLSS subset 3)
  • Each SLSS sequence is identified by a unique index number).
  • the SLSS sequence set can be divided into two subsets in the foregoing manner: SLSS subset 1, SLSS subset 2, and SLSS subset 1 is further divided into subset 1a and subset 1b.
  • Subset 1a corresponds to synchronization level 1
  • subset 1b corresponds to synchronization level 2
  • SLSS subset 2 corresponds to synchronization level 3.
  • the principle according to the synchronization signal sequence of each synchronization level notified by the base station through the broadcast message is as described above, and is not repeated here, but due to the synchronization level and
  • the correspondences of the subsets in the SLSS sequence set are different.
  • the SLSS sequence needs to be selected from the corresponding subset according to the corresponding correspondence in the case.
  • the process of determining the synchronization subframe of the synchronization information of the terminal according to the synchronization level of the terminal may be configured by using two or three synchronization subframes in a synchronization period, as described in the foregoing scenario 1. Said, no longer repeated here.
  • the terminal may acquire the PBSCH content according to the broadcast message, and obtain the acquired PBSCH content and the SLSS.
  • the sequences are sent together in a sync subframe.
  • the base station may carry the PBSCH content or related information in the broadcast message.
  • the terminal cannot receive the broadcast message of the base station, such as a V2V message, nor can it receive the synchronization signal sent by the terminal of the synchronization level 1a;
  • the terminal cannot receive the broadcast message of the base station, but can receive the synchronization signal sent by the terminal of the synchronization level 1a;
  • the terminal can receive the broadcast message sent by the base station.
  • Scenario 3 The terminal cannot receive the broadcast message of the base station, nor can it receive the synchronization signal sent by the terminal of the synchronization level 1a.
  • the synchronization signal (such as SLSS) sequence set can be divided into three subsets: SLSS subset 1, SLSS subset 2, and SLSS subset 3.
  • SLSS subset 1 For the specific division method and the correspondence between each subset and the synchronization level, refer to the related description in scenario 1.
  • the principle that the terminal determines the synchronization signal sequence to be transmitted can also be referred to the related description in the scenario 1.
  • two or three synchronization subframes may be included in one synchronization period.
  • the terminal determines the synchronization subframe for transmitting the synchronization information refer to the related description in scenario 1.
  • the synchronization level 1a and the synchronization level 1 correspond to the same synchronization subframe. If the synchronization level of the terminal is the synchronization level 3, and the terminal of the synchronization level 1a is clocked as the synchronization source into the synchronization level 3, the first synchronization signal sequence transmitted according to the terminal of the synchronization level 1a as the synchronization source And selecting a second synchronization signal sequence from the subset corresponding to the synchronization level 3, where the second synchronization signal sequence is sent in a synchronization subframe after the synchronization subframe occupied by the synchronization signal of the synchronization level 1a.
  • the terminal may obtain The predefined PBSCH content is taken, and the predefined PBSCH content is transmitted in the synchronization subframe together with the SLSS sequence.
  • the synchronization signal (such as SLSS) sequence set can be divided into three subsets: SLSS subset 1, SLSS subset 2, and SLSS subset 3.
  • SLSS subset 1 For the specific division method and the correspondence between each subset and the synchronization level, refer to the related description in scenario 1.
  • the principle that the terminal determines the synchronization signal sequence to be transmitted can also be referred to the related description in the scenario 1.
  • the first synchronization signal sequence transmitted according to the terminal of the synchronization level 1a as the synchronization source And selecting a second synchronization signal sequence from the subset corresponding to the synchronization level 3; wherein, the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-agreed.
  • two or three synchronization subframes may be included in one synchronization period.
  • the synchronization level 1a and the synchronization level 1 correspond to the same synchronization subframe.
  • the synchronization level of the terminal is the synchronization level 3, and the terminal of the synchronization level 1a is clocked as the synchronization source into the synchronization level 3, the first synchronization signal sequence transmitted according to the terminal of the synchronization level 1a as the synchronization source And selecting a second synchronization signal sequence from the subset corresponding to the synchronization level 3, where the second synchronization signal sequence is sent in a synchronization subframe after the synchronization subframe occupied by the synchronization signal of the synchronization level 1a.
  • the terminal can obtain the synchronization signal.
  • the PBSCH content is acquired in the synchronization information sent by the terminal of level 1a, and the acquired PBSCH content is transmitted in the synchronization subframe together with the SLSS sequence.
  • the synchronization signal (such as SLSS) sequence set can be divided into three subsets: SLSS subset 1, SLSS subset 2, and SLSS subset 3.
  • SLSS subset 1 For the specific division method and the correspondence between each subset and the synchronization level, refer to the related description in scenario 1.
  • the manner in which the base station notifies the synchronization signal sequence corresponding to each synchronization level by using the broadcast message can also be referred to the related description in the scenario 1.
  • the base station can select one SLSS sequence from the SLSS subset 1 and notify by broadcast message.
  • two or three synchronization subframes may be included in one synchronization period.
  • the synchronization level 1a and the synchronization level 1 correspond to the same synchronization subframe.
  • the synchronization level of the terminal is Synchronization level 3
  • the terminal of the synchronization level 1a is clock-synchronized into the synchronization level 3
  • the first synchronization signal sequence transmitted by the terminal of the synchronization level 1a as the synchronization source corresponds to the synchronization level 3
  • the subset of the second synchronization signal is selected, and the second synchronization signal sequence is transmitted in a synchronization subframe subsequent to the synchronization subframe occupied by the synchronization signal of the synchronization level 1a.
  • the terminal may acquire the PBSCH content according to the broadcast message, and obtain the acquired PBSCH content and the SLSS.
  • the sequences are sent together in a sync subframe.
  • the base station may carry the PBSCH content or related information in the broadcast message.
  • the embodiment of the present application further provides a terminal, where the terminal can implement the clock synchronization scheme 1 described above.
  • the terminal shown in FIG. 5 may include: a receiving module 501 and a synchronization module 502.
  • the synchronization module 502 is configured to: if the receiving module 501 receives the timing signal of the UTC system, perform clock synchronization of the UTC system as a synchronization source, and enter a synchronization level 1; otherwise, if the receiving module receives the first duration To the synchronization signal, the terminal or the base station transmitting the synchronization signal is clocked as a synchronization source according to the level of the synchronization signal.
  • the synchronization module 502 can be specifically configured to:
  • the receiving module does not receive the timing signal of the UTC system within the first time period but receives the downlink pilot signal sent by the base station of the synchronization level 0, then:
  • the timing compensation enable flag is used to indicate whether the timing compensation is enabled; If the timing compensation is enabled, and the terminal is clock synchronization based on the timing compensation based on the distance calibration or the uplink synchronization calibration, the synchronization level 2 is entered, otherwise the synchronization level 3 is entered, if the timing compensation is not made Yes, enter the synchronization level 2;
  • the base station of the synchronization level 0 is a base station that performs clock synchronization with the UTC system and can broadcast the offset of the downlink pilot signal and the UTC clock.
  • the synchronization module 502 can be specifically configured to:
  • the receiving module 501 receives the synchronization signal sent by the terminal of the synchronization level 1 in the first time period, the terminal of the synchronization level 1 is clocked as the synchronization source, and enters the synchronization level 2; or
  • the receiving module 501 does not receive the synchronization signal sent by the terminal of the synchronization level 1 in the first time period, but receives the synchronization signal sent by the terminal of the synchronization level 2, the terminal of the synchronization level 2 is used as the synchronization source for clock synchronization. , And enter sync level 3; or,
  • the clock synchronization is performed according to the synchronization signals of all the synchronization levels 3 received in the N synchronization periods, or the N synchronization periods are In the source terminal of the synchronization signal of the synchronization level 3 received, the terminal with the highest time is clocked as the synchronization source, and enters the synchronization level 3, where N is an integer greater than or equal to 1; wherein the synchronization level 3
  • the synchronization signal includes a synchronization level 3 terminal and/or a base station transmission synchronization signal, and the synchronization level 3 base station refers to a base station that is not clocked with the UTC system or a base station that cannot obtain its own position.
  • the synchronization module 502 is further configured to: if the receiving module 501 does not receive the timing signal of the UTC system within the first duration, and does not receive the synchronization signal sent by the base station or other terminal, after the first duration When the second time period is cut off, the synchronization level 3 is entered.
  • the synchronization module 502 is further configured to: if the receiving module 501 of the terminal entering the synchronization level 1 receives the synchronization signal sent by the base station or other terminal, discard the base station or other terminal that sends the synchronization signal as a synchronization source. Synchronize.
  • the terminal shown in FIG. 6 may include a processor 601, a memory 602, a transceiver 603, and a bus interface.
  • the processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 can store data used by the processor 601 in performing operations.
  • the transceiver 603 is configured to receive and transmit data under the control of the processor 601.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 601 and various circuits of memory represented by memory 602.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 603 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 601 is responsible for managing the bus architecture and general processing, and the memory 602 can store data used by the processor 601 in performing operations.
  • the flow of the clock synchronization scheme 1 disclosed in the embodiment of the present application may be applied to the processor 601 or implemented by the processor 601.
  • the steps of the clock synchronization scheme-flow process may be completed by the integrated logic circuit of the hardware in the processor 601 or the instruction in the form of software.
  • the processor 601 can be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, and a discrete hardware component, which can be implemented or executed in the embodiment of the present application.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 602, and the processor 601 reads the information in the memory 602, and completes the clock synchronization scheme 1 provided by the foregoing embodiment in combination with the hardware thereof. The steps of the process.
  • the processor 601 is configured to read a program in the memory 602, and execute the flow of the clock synchronization scheme 1 described in the foregoing embodiment.
  • the processor 601 is configured to read a program in the memory 602, and execute the flow of the clock synchronization scheme 1 described in the foregoing embodiment.
  • the embodiment of the present application further provides a terminal, where the terminal can implement the clock synchronization scheme 2 described above.
  • the terminal shown in FIG. 7 may include: a receiving module 701 and a synchronization module 702.
  • the synchronization module 702 is configured to: if the receiving module 701 receives the downlink pilot signal sent by the base station of the synchronization level 0, the synchronization level 0 is The base station performs clock synchronization as a synchronization source and enters the synchronization level 1a; otherwise, if the receiving module receives the synchronization signal sent by another terminal or the timing signal of the UTC system within the first duration, the base station synchronizes according to the synchronization level of the other terminal.
  • the other terminal is used as a synchronization source or the UTC system is clocked as a synchronization source.
  • the synchronization module 702 can be specifically configured to:
  • the receiving module receives the synchronization signal sent by the terminal of the synchronization level 1a within the first time period, the terminal of the synchronization level 1a is clocked as a synchronization source, and enters the synchronization level 3; or
  • the receiving module 701 receives only the synchronization signal sent by the terminal whose synchronization level is not higher than 1 in the first time period, and the terminal including the synchronization level 1 in the terminal whose synchronization level is not higher than 1, the synchronization level 1 is The terminal is clocked as a synchronization source and enters synchronization level 2; or,
  • the receiving module 701 receives only the synchronization signal sent by the terminal whose synchronization level is not higher than 2 in the first time period, and the terminal including the synchronization level 2 in the terminal whose synchronization level is not higher than 2, the synchronization level 2 is The terminal is clocked as a synchronization source and enters synchronization level 3; or,
  • the clock synchronization is performed according to the synchronization signals of all the synchronization levels 3 received in the N synchronization periods, or the N In the source terminal of the synchronization signal of the synchronization level 3 received in the synchronization period, the terminal with the highest time is clocked as the synchronization source, and enters the synchronization level 3, where N is an integer greater than or equal to 1.
  • the synchronization module 702 is specifically configured to: when the receiving module 701 does not receive the synchronization signal sent by the terminal of the synchronization level 1a within the first time period, but receives the timing signal of the UTC system, the UTC system is used as the synchronization.
  • the source is clocked and enters sync level 1.
  • the synchronization module 702 is further configured to: if the receiving module 701 does not receive the synchronization signal sent by the base station or other terminal within the first duration, enter the synchronization level 3 when the second duration after the first duration is cut off. .
  • the terminal shown in FIG. 8 may include a processor 801, a memory 802, a transceiver 803, and a bus interface.
  • the processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 can store data used by the processor 801 in performing operations.
  • the transceiver 803 is configured to receive and transmit data under the control of the processor 801.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 801 and various circuits of memory represented by memory 802.
  • the bus architecture can also be used for peripherals Various other circuits, such as standbys, voltage regulators, power management circuits, and the like, are linked together and are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 803 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 can store data used by the processor 801 in performing operations.
  • the flow of the clock synchronization scheme 2 disclosed in the embodiment of the present application may be applied to the processor 801 or implemented by the processor 801.
  • each step of the clock synchronization scheme 2 process may be completed by an integrated logic circuit of hardware in the processor 801 or an instruction in a form of software.
  • the processor 801 can be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, and a discrete hardware component, which can be implemented or executed in the embodiment of the present application.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802, and completes the steps of the flow of the clock synchronization scheme 2 provided by the foregoing embodiment in combination with the hardware thereof.
  • the processor 801 is configured to read a program in the memory 802, and execute the flow of the clock synchronization scheme 2 described in the foregoing embodiment.
  • the processor 801 is configured to read a program in the memory 802, and execute the flow of the clock synchronization scheme 2 described in the foregoing embodiment.
  • the embodiment of the present application further provides a terminal, where the terminal can implement the synchronous information transmission scheme.
  • the terminal shown in FIG. 9 may include:
  • the obtaining module 901 is configured to acquire a synchronization signal sequence to be sent. If the terminal receives the broadcast message sent by the base station, the terminal acquires a synchronization signal sequence according to the broadcast message. Otherwise, according to the synchronization level of the terminal, the synchronization Acquiring a synchronization signal sequence in the configured synchronization signal sequence set;
  • a determining module 902 configured to determine, according to a synchronization level of the terminal, a synchronization subframe that sends synchronization information
  • the sending module 903 is configured to send synchronization information in the determined synchronization subframe, where the sent synchronization information includes the acquired synchronization signal sequence.
  • the pre-configured synchronization signal sequence set includes N subsets, N is an integer greater than or equal to 3, and different synchronization levels correspond to different subsets.
  • the obtaining module 901 is specifically configured to:
  • the synchronization level of the terminal is 1, selecting a pre-agreed synchronization signal sequence from the subset corresponding to the synchronization level 1; or
  • a pre-agreed synchronization signal sequence is selected from the subset corresponding to the synchronization level 2;
  • a synchronization signal sequence is selected from the subset corresponding to the synchronization level 3, if the synchronization level of the terminal is 3, and clock synchronization with the synchronization source whose synchronization level is not lower than the synchronization level 3 enters the synchronization level 3, and acquires the synchronization signal sequence identical or corresponding to the synchronization signal sequence transmitted by the synchronization source according to the synchronization source.
  • the obtaining module 901 is specifically configured to:
  • the terminal according to the synchronization level 2 or the synchronization level 1a as the synchronization source is used.
  • the first synchronization signal sequence is sent, and the second synchronization signal sequence is selected from the subset corresponding to the synchronization level 3; wherein the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-agreed; or
  • the synchronization signal sequence transmitted by the terminal of the synchronization level 3 as the synchronization source is used as the The sequence of synchronization signals to be transmitted.
  • the obtaining module 901 can be specifically configured to:
  • the first synchronization signal sequence transmitted according to the terminal of the synchronization level 1a as the synchronization source And selecting a second synchronization signal sequence from the subset corresponding to the synchronization level 3, where the correspondence between the first synchronization signal sequence and the second synchronization signal sequence is pre-configured or agreed;
  • the determining module 902 is specifically configured to determine, when the synchronization subframe that sends the synchronization information is determined, a synchronization subframe subsequent to the synchronization subframe occupied by the synchronization signal of the synchronization level 1a, and determine a synchronization partner that sends the synchronization information to the terminal. frame.
  • a synchronization period includes a first synchronization subframe, a second synchronization subframe, and a third synchronization subframe, and a total of three synchronization subframes, and the first synchronization subframe corresponds to synchronization level 1 and synchronization level 3, and the second synchronization sub-frame
  • the frame corresponds to the synchronization level 2
  • the third synchronization subframe corresponds to the synchronization level 3; correspondingly, the determining module 902 can be specifically used for:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 3, and the synchronization signal sent by the terminal of the synchronization level 2 can be received, determining the third synchronization subframe as the synchronization subframe for transmitting the synchronization information; otherwise, determining the first synchronization subframe Or the third synchronization subframe is used as a synchronization subframe for transmitting synchronization information.
  • one synchronization period includes a first synchronization subframe and a second synchronization subframe, and two synchronization subframes, the first synchronization subframe corresponds to synchronization level 1 and synchronization level 3, and the second subframe corresponds to synchronization level 2 and synchronization.
  • Level 3 correspondingly, the determining module 902 can be specifically used to:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 3, and the synchronization signal sent by the terminal of the synchronization level 2 can be received, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; otherwise, determining the first synchronization subframe Or the second subframe is a synchronization subframe that transmits synchronization information.
  • a synchronization period includes a first synchronization subframe and a second synchronization subframe, and the first synchronization subframe corresponds to the synchronization level 1, and the second synchronization subframe corresponds to the synchronization level 2; correspondingly, determining Module 902 can be specifically configured to:
  • the synchronization level of the terminal is the synchronization level 1, determining the first synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization level of the terminal is the synchronization level 2, determining the second synchronization subframe as the synchronization subframe for transmitting the synchronization information; or
  • the synchronization information is discarded.
  • the preset synchronization signal sequence set includes N subsets, N is an integer greater than or equal to 3, different synchronization levels correspond to different subsets; and the broadcast message sent by the base station carries an indication of a synchronization signal sequence.
  • Information wherein: the synchronization signal sequence corresponding to the synchronization level 1 or the synchronization level 1a is selected from the subset corresponding to the synchronization level 1; the synchronization signal sequence corresponding to the synchronization level 2 is selected from the subset corresponding to the synchronization level 2; 3 The corresponding synchronization signal sequence is selected from the subset corresponding to the synchronization level 3.
  • the number of subsets included in the set of pre-configured synchronization signal sequences is three, and the three subsets respectively correspond to synchronization level 1, synchronization level 2, and synchronization level 3, and synchronization level sequence corresponding to synchronization level 3
  • the number of the subset of synchronization signal sequences corresponding to the synchronization level 2 is not less than the number of synchronization signal sequences corresponding to the synchronization level 2; or the first subset and the second subset are included in the pre-configured synchronization signal sequence set, the first subset includes 2 subsets, respectively Corresponding to the synchronization level 1 and the synchronization level 2, the second subset corresponds to the synchronization level 3, and the number of synchronization signal sequences in the second subset is not less than the number of synchronization signal sequences in the first subset.
  • the synchronization information sent by the sending module 903 further includes PBSCH content; wherein, if the terminal receives the broadcast message sent by the base station, the PBSCH content sent by the sending module 903 is obtained from the broadcast message. Otherwise, the PBSCH content sent by the sending module 903 is pre-configured; or the synchronization information sent by the sending module 903 further includes PBSCH content; wherein, if the terminal does not receive the broadcast message sent by the base station, If the synchronization signal sent by the terminal of the synchronization level 1a is not received, the content of the PBSCH sent by the sending module 903 is pre-configured, and if the terminal does not receive the broadcast message of the base station but receives the broadcast message of the synchronization level 1a, the terminal sends the synchronization level 1a.
  • the synchronization signal, the PBSCH content sent by the sending module 903 is from the end of the synchronization level 1a If the terminal receives the broadcast message sent by the base station, the content of the PBSCH sent by the sending module 903 is obtained from the broadcast message sent by the base station.
  • the determining module 902 is further configured to: if it is detected that the synchronization resource used by the terminal conflicts with the synchronization resource used by another terminal, select a new idle subframe to send synchronization information.
  • the terminal shown in FIG. 10 may include a processor 1001, a memory 1002, a transceiver 1003, and a bus interface.
  • the processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 can store data used by the processor 1001 in performing operations.
  • the transceiver 1003 is configured to receive and transmit data under the control of the processor 1001.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1001 and various circuits of memory represented by memory 1002.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the transceiver 1003 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 can store data used by the processor 1001 in performing operations.
  • the flow of the synchronization information transmission scheme disclosed in the embodiment of the present application may be applied to the processor 1001 or implemented by the processor 1001.
  • the steps of the synchronization information transmission scheme flow may be completed by the integrated logic circuit of the hardware in the processor 1001 or the instruction in the form of software.
  • the processor 1001 can be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or a transistor logic device, and a discrete hardware component, which can be implemented or executed in the embodiment of the present application.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002, and combines the hardware to complete the steps of the flow of the synchronization information transmission scheme provided by the foregoing embodiment.
  • the processor 1001 is configured to read a program in the memory 1002 and execute the flow of the synchronization information transmission scheme described in the foregoing embodiment.
  • the processor 1001 is configured to read a program in the memory 1002 and execute the flow of the synchronization information transmission scheme described in the foregoing embodiment.
  • the process refer to the foregoing embodiment, and details are not described herein again.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

L'invention concerne un procédé de synchronisation d'horloges, et un procédé et un appareil d'émission d'informations de synchronisation. Dans la présente invention, deux solutions sont définies pour la synchronisation d'horloges. Les classes de synchronisation et les conditions pour entrer différentes classes de synchronisation sont définies dans chaque solution de synchronisation d'horloges, ce qui permet de mettre en œuvre une synchronisation d'horloges. La présente invention, pour réaliser une solution d'émission d'informations de synchronisation, comprend les étapes suivantes : si un terminal reçoit un message de diffusion envoyé par une station de base, il acquiert une séquence de signaux de synchronisation selon le message de diffusion, sinon il acquiert une séquence de signaux de synchronisation à partir d'une séquence de signaux de synchronisation préconfigurée définie selon une classe de synchronisation du terminal ; et le terminal détermine, en fonction de sa classe de synchronisation propre, une sous-trame de synchronisation qui envoie des informations de synchronisation. La solution permet de mettre en œuvre l'émission d'informations de synchronisation et de réduire les conflits des ressources de synchronisation.
PCT/CN2016/103293 2015-11-05 2016-10-25 Procédé de synchronisation d'horloges, et procédé et appareil d'émission d'informations de synchronisation WO2017076195A1 (fr)

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