# US 11,452,055 B2 · Terminal synchronization method and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,055 B2 - Document ID: US11452055B2 - Status: Granted - Kind: B2 - Application number: 17/000,902 - Filed: 2020-08-24 - Published: 2021-02-18 - Granted: 2022-09-20 - Earliest claimed: 2020-08-24 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yongbo Zeng; Bin Liu; Yu Cai; Jian Wang; Guorong Li - Web page: https://patentgrep.com/patent/US11452055B2 ## CPC - H04W 56/001: {Synchronization between nodes} - H04W 4/46: for vehicle-to-vehicle communication [V2V] - H04W 56/00: Synchronisation arrangements - H04W 56/0045: {compensating for timing error by altering transmission time} - H04W 76/14: Direct-mode setup - H04W 88/023: {with message or information receiving capability} - H04W 88/04: adapted for relaying to or from another terminal or user - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of this application relate to the communications field, and provide a terminal synchronization method and a terminal. A terminal sends synchronization signals in a distributed manner by controlling a sequence for sending the synchronization signals, so that terminals in a vehicle to vehicle communications system can have uniform timing. The method includes: obtaining, by a terminal, a configurable transmission period for sending a first synchronization signal; and sending, by the terminal, the first synchronization signal based on the configurable transmission period. ## Claims ### Claim 1 A terminal synchronization method implemented by a terminal, comprising: obtaining a transmission interval for transmitting a set of synchronization signals within a time duration, wherein the transmission interval indicates a time interval between two adjacent synchronization signals of one set of synchronization signals from the terminal, and wherein the transmission interval is a configurable interval; obtaining a starting offset for transmitting the set of synchronization signals, wherein the starting offset indicates an offset time from a starting time point of the time duration to a time point at which the terminal transmits a first synchronization signal of the one set of synchronization signals, and wherein the terminal obtains the starting offset based on a type of a synchronization reference with which the set of synchronization signals are synchronized; and transmitting the set of synchronization signals based on the transmission interval and the starting offset. ### Claim 2 (depends on 1) The terminal synchronization method of claim 1, wherein the transmission interval comprises an interval between a first start point of one synchronization signal of the one set of synchronization signals to a second start point of a next synchronization signal of the one set of synchronization signals. ### Claim 3 (depends on 1) The terminal synchronization method of claim 1, further comprising: determining a time point of an nth synchronization signal of the one set of synchronization signals based on the transmission interval and the starting offset; and transmitting the nth synchronization signal at the time point of the nth synchronization signal. ### Claim 4 (depends on 3) The terminal synchronization method of claim 3, wherein the time point of the nth synchronization signal is determined by using the following formula: Tn=T_offset+T_interval*(n−1), wherein Tn is the time point of the nth synchronization signal, wherein N_offset is the starting offset, wherein T_interval is the transmission interval, wherein n is a synchronization signal index, and wherein n≥1. ### Claim 5 (depends on 1) The terminal synchronization method of claim 1, further comprising receiving an indication message from a network device, wherein the indication message comprises the transmission interval and the starting offset. ### Claim 6 (depends on 1) The terminal synchronization method of claim 1, further comprising selecting the configurable interval from at least two transmission intervals. ### Claim 7 (depends on 6) The terminal synchronization method of claim 6, further comprising storing the at least two transmission intervals in the terminal. ### Claim 8 (depends on 1) The terminal synchronization method of claim 1, further comprising stopping transmission of the set of synchronization signals when the time duration ends. ### Claim 9 (depends on 1) The terminal synchronization method of claim 1, further comprising determining that a transmitting policy is satisfied, wherein the transmitting policy includes the terminal not detecting any other synchronization signals within a preset time period. ### Claim 10 (depends on 1) The terminal synchronization method of claim 1, further comprising determining that a transmitting policy is satisfied, wherein the transmitting policy includes the terminal detecting a second synchronization signal, and wherein a priority of a second synchronization source corresponding to the second synchronization signal is lower than a priority of a first synchronization source corresponding to the first synchronization signal. ### Claim 11 (depends on 1) The terminal synchronization method of claim 1, wherein the starting offset is 10 milliseconds (ms). ### Claim 12 (depends on 1) The terminal synchronization method of claim 1, wherein the starting offset is 20 milliseconds (ms). ### Claim 13 (depends on 1) The terminal synchronization method of claim 1, wherein the starting offset is 30 milliseconds (ms). ### Claim 14 (depends on 1) The terminal synchronization method of claim 1, wherein the starting offset is 40 milliseconds (ms). ### Claim 15 (depends on 1) The terminal synchronization method of claim 1, wherein the set of synchronization signals comprises one set of side link (SL) primary synchronization signals (S-PSS) and one set of SL secondary synchronization signals (S-SSS). ### Claim 16 (depends on 1) The terminal synchronization method of claim 1, wherein the terminal synchronization method is applied to a vehicle-to-vehicle communications system. ### Claim 17 A terminal, comprising: a processor configured to: obtain a transmission interval for transmitting a set of synchronization signals within a time duration, wherein the transmission interval indicates a time interval between two adjacent synchronization signals of one set of synchronization signals from the terminal, and wherein the transmission interval is a configurable interval; and obtain a starting offset for transmitting the set of synchronization signals, wherein the starting offset indicates an offset time from a starting time point of the time duration to a time point at which the terminal transmits a first synchronization signal of one set of synchronization signals, and wherein the terminal obtains the starting offset based on a type of a synchronization reference with which the set of synchronization signals are synchronized; and a communications interface coupled to the processor and configured to transmit the set of synchronization signals based on the transmission interval and the starting offset. ### Claim 18 (depends on 17) The terminal of claim 17, wherein the communications interface is further configured to receive an indication message from a network device, and wherein the indication message comprises the transmission interval and the starting offset. ### Claim 19 A computer program product comprising instructions stored on a non-transitory computer-readable medium that, when executed by a processor, cause a terminal to: obtain a transmission interval for transmitting a set of synchronization signals within a time duration, wherein the transmission interval indicates a time interval between two adjacent synchronization signals of one set of synchronization signals from the terminal, and wherein the transmission interval is a configurable interval; obtain a starting offset for transmitting the set of synchronization signals, wherein the starting offset indicates an offset time from a starting time point of the time duration to a time point at which the terminal transmits a first synchronization signal of the one set of synchronization signals, and wherein the terminal obtains the starting offset based on a type of a synchronization reference with which the set of synchronization signals are synchronized; and transmit the set of synchronization signals based on the transmission interval and the starting offset. ### Claim 20 (depends on 19) The computer program product of claim 19, wherein the instructions further cause the terminal to receive an indication message from a network device, and wherein the indication message comprises the transmission interval and the starting offset.