# US 2022/0286256 A1 · Method and device for wireless communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0286256 A1 - Document ID: US20220286256A1 - Status: Published application - Kind: A1 - Application number: 17/735,127 - Filed: 2022-05-03 - Published: 2022-09-08 - Earliest claimed: 2019-11-05 - Assignees: Shanghai Langbo Communication Technology Company Limited - Inventors: Xiaobo ZHANG - Web page: https://patentgrep.com/patent/US20220286256A1 ## CPC - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04J 3/06: Synchronising arrangements {(for television systems H04N5/04; bit-synchronisation H04L7/00)} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 5/0078: {Timing of allocation} - H04W 4/70: Services for machine-to-machine communication [M2M] or machine type communication [MTC] - H04W 56/00: Synchronisation arrangements - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Method and Device in communication nodes for wireless communications. A first node receives first information; and transmits second information and third information; herein, the first information is used for indicating a first time window, the second information is used for indicating a second time window, and the third information is used for indicating whether the second time window is synchronous with the first time window. When there is a long distance of UE-base station communications, particularly relating to NTN communications, pre-compensation can be made for a timing advance, when an NTN UE is D2D networking with other UEs, a scheme proposed in the present disclosure to indicate whether there is pre-compensation for timing advance can serve as a reference for the synchronization reference source selection. With other conditions still unchanged, an NTN-aid D2D UE which has pre-compensated for the timing advance will be chosen preferentially as a synchronization reference source. ## Claims ### Claim 1 A first node for wireless communications, comprising: a first receiver, receiving first information; and a first transmitter, transmitting second information and third information; wherein the first information is used for indicating a first time window, the second information is used for indicating a second time window, and the third information is used for indicating whether the second time window is synchronous with the first time window. ### Claim 2 (depends on 1) The first node according to claim 1, comprising: the first transmitter, transmitting a first radio signal; wherein when the first radio signal is transmitted in a mainlink, the first radio signal is kept in synchronization with the first time window; when the first radio signal is transmitted in a sidelink, the first radio signal is kept in synchronization with the second time window. ### Claim 3 (depends on 1) The first node according to claim 1, comprising: the first receiver, monitoring fourth information; wherein only when the fourth information is detected will the third information be transmitted. ### Claim 4 (depends on 1) The first node according to claim 1, comprising: the first transmitter, transmitting a second radio signal; wherein the second radio signal indicates a first time resource pool in the second time window. ### Claim 5 (depends on 1) The first node according to claim 1, comprising: the first transmitter, transmitting a third radio signal; wherein the third radio signal is used for indicating that a transmitter for the first information is chosen as a synchronization reference source. ### Claim 6 (depends on 3) The first node according to claim 3, comprising: the first transmitter, transmitting a first parameter when the third information indicates that the first time window is asynchronous with the second time window; wherein the fourth information is used to determine the first parameter. ### Claim 7 (depends on 1) The first node according to claim 1, comprising: the first time window is explicitly indicated by the first information received by the first receiver. ### Claim 8 (depends on 1) The first node according to claim 1, comprising: the first time window is implicitly indicated by the first information received by the first receiver. ### Claim 9 A second node for wireless communications, comprising: a second receiver, receiving second information and third information; wherein the second information is used for indicating a second time window, the third information is used for indicating whether the second time window is synchronous with a first time window, the first time window being indicated by first information. ### Claim 10 (depends on 9) The second node according to claim 9, comprising: the second receiver, receiving second information and third information; wherein the second information is used for indicating a second time window, the third information is used for indicating whether the second time window is synchronous with a first time window, the first time window being indicated by first information. ### Claim 11 (depends on 9) The second node according to claim 9, comprising: the second receiver, determining a synchronization reference source; and a second transmitter, transmitting a fourth radio signal; wherein a reception timing for a synchronization signal transmitted by the synchronization reference source, which is determined by the second receiver, is used to determine a transmission timing for the fourth radio signal, the third information is used to determine whether a transmitter for the second information is chosen as a synchronization reference source. ### Claim 12 (depends on 11) The second node according to claim 11, comprising: a second receiver chooses a synchronization reference source from K candidate synchronization reference sources according to a first priority, where the synchronization reference source is one of the K candidate synchronization reference sources, of which the first priority is highest, the first priority is related to parameters for the candidate synchronization reference source, where K is a positive integer greater than 1. ### Claim 13 (depends on 12) The second node according to claim 12, comprising: when the type of the synchronization reference source for the candidate synchronization reference source is NTN base station, the first priority is related to the third information. ### Claim 14 (depends on 9) The second node according to claim 9, comprising: the second receiver, receiving a first radio signal; wherein the first radio signal is kept in synchronization with the second time window. ### Claim 15 (depends on 9) The second node according to claim 9, comprising: the second receiver, receiving a second radio signal; wherein the second radio signal indicates a first time resource pool in the second time window. ### Claim 16 (depends on 9) The second node according to claim 9, comprising: the second receiver, receiving a third radio signal; wherein the third radio signal is used for indicating that a transmitter for the first information is chosen as a synchronization reference source for a transmitter for the third information. ### Claim 17 (depends on 9) The second node according to claim 9, comprising: the second receiver, receiving a first parameter when the third information indicates that the first time window is asynchronous with the second time window; wherein fourth information is used to determine the first parameter. ### Claim 18 A method in a first node for wireless communications, comprising: receiving first information; and transmitting second information and third information; wherein the first information is used for indicating a first time window, the second information is used for indicating a second time window, and the third information is used for indicating whether the second time window is synchronous with the first time window. ### Claim 19 (depends on 18) The method in the first node for wireless communications according to claim 18, comprising: transmitting a third radio signal; wherein the third radio signal is used for indicating that a transmitter for the first information is chosen as a synchronization reference source. ### Claim 20 (depends on 18) The method in the first node for wireless communications according to claim 18, comprising: transmitting a first parameter, when the third information indicates that the first time window is asynchronous with the second time window; wherein fourth information is used to determine the first parameter.