Method and device in UE and base station used for wireless communication

1. A method in a User Equipment (UE) for wireless communication, comprising:

receiving a first signaling and a second radio signal; and

transmitting a first radio signal on a sidelink;

wherein:

the first signaling is correlated to a first synchronization sequence, the first signaling indicates a first feature identity and a second identity, and a first signature sequence is used for generating the first radio signal, a second synchronization sequence corresponds to the second identity; the first synchronization sequence corresponds to a first identity, the first identity differs from the second identity; the first identity is a Physical Cell Identifier and the second identity is a Physical Cell Identifier; the first radio signal is transmitted on a first time-frequency resource set, and the first signaling explicitly indicates the first time-frequency resource set; the first signaling is Radio Resource Control signalling; the first feature identity is a Sidelink Synchronization Sequence Identity; the first feature identity is used for generating the first signature sequence;

the receiving timing of the second radio signal is used for determining the transmitting timing of the first radio signal;

the second radio signal is associated with the second synchronization sequence, and the first synchronization sequence differs from the second synchronization sequence;

a transmitter of the first signaling corresponds to a first node, and a transmitter of the second radio signal corresponds to a second node; and

the first node is a serving cell corresponding to the UE, the second node is a neighbor cell of the serving cell corresponding to the UE.

2. The method according to claim 1 , wherein the neighbor cell of the serving cell corresponding to the UE is a target cell for a handover of the UE, the first signaling is used for configuring resources occupied by the D2D transmission after the UE initiates handover, the configuration of the resources is done by the target cell.

3. The method according to claim 1 , wherein the first node is selected as synchronization reference source before the UE initiates handover, and the second node is selected as synchronization reference source after the UE initiates handover.

4. The method according to claim 2 , wherein the first node is selected as synchronization reference source before the UE initiates handover, and the second node is selected as synchronization reference source after the UE initiates handover.

5. The method according to claim 1 , wherein the first signaling includes part or all fields of an SL-SyncConfig IE.

6. The method according to claim 1 , comprising:

transmitting a second signaling on a sidelink;

receiving first information on a sidelink;

wherein at least one measurement from the following set of measurements of: {a channel measurement for a third link, a channel measurement for a fourth link} is used for determining the first information; a radio channel from the first node to a transmitter of the first information corresponds to the third link, and a radio channel from the second node to the transmitter of the first information corresponds to the fourth link; the second signaling is used for triggering the transmission of the first information; at least one measurement from the following set of measurements {a channel measurement for a first link, a channel measurement for a second link} is used for determining the second signaling; and a radio channel from the first node to the transmitter of the first radio signal corresponds to the first link, and a radio channel from the second node to the transmitter of the first radio signal corresponds to the second link.

7. The method according to claim 6 , wherein the second signaling is a physical layer signaling, or the second signaling is used for triggering the transmission of the first information, and at least one of {channel measurement for the first link, channel measurement for the second link} is used for determining the second signaling, or a first parameter is a result of channel measurement for the first link, and a second parameter is a result of channel result for the second link, if the first parameter and the second parameter meet a first condition, the UE transmits the second signaling, otherwise, the UE does not transmit the second signaling, the first condition is that the first parameter is less than the second parameter or the first condition is that the sum of the first parameter and a first offset value is less than the second parameter.

8. The method according to claim 1 , comprising:

handing over from the serving cell to the neighbor cell;

transmitting a third radio signal;

wherein the receiving timing for the neighbor cell is used for determining the transmitting timing of the third radio signal.

9. A User Equipment (UE) for wireless communication, comprising:

a first processing module, to receive a first signaling and a second radio signal;

a second processing module, to transmit a first radio signal on a sidelink;

wherein:

the first signaling is correlated to a first synchronization sequence, the first signaling indicates a first feature identity and a second identity, and a first signature sequence is used for generating the first radio signal, a second synchronization sequence corresponds to the second identity; the first synchronization sequence corresponds to a first identity, the first identity differs from the second identity; the first identity is a Physical Cell Identifier and the second identity is a Physical Cell Identifier; the first radio signal is transmitted on a first time-frequency resource set, and the first signaling explicitly indicates the first time-frequency resource set; the first signaling is Radio Resource Control signalling; the first feature identity is a Sidelink Synchronization Sequence Identity; the first feature identity is used for generating the first signature sequence;

the receiving timing of the second radio signal is used for determining the transmitting timing of the first radio signal;

the second radio signal is associated with the second synchronization sequence, the first synchronization sequence differs from the second synchronization sequence; a transmitter of the first signaling corresponds to a first node, and a transmitter of the second radio signal corresponds to a second node; and

the first node is a serving cell corresponding to the UE, the second node is a neighbor cell of the serving cell corresponding to the UE.

10. The UE according to claim 9 , wherein the neighbor cell of the serving cell corresponding to the UE is a target cell for a handover of the UE, the first signaling is used for configuring resources occupied by the D2D transmission after the UE initiates handover, the configuration of the resources is done by the target cell.

11. The UE according to claim 9 , wherein the first node is selected as synchronization reference source before the UE initiates handover, and the second node is selected as synchronization reference source after the UE initiates handover.

12. The method according to claim 10 , wherein the first node is selected as synchronization reference source before the UE initiates handover, and the second node is selected as synchronization reference source after the UE initiates handover.

13. The UE according to claim 9 , wherein the first signaling includes part or all fields of an SL-SyncConfig 1 E.

14. The UE according to claim 9 , wherein the second processing module receives first information on a sidelink and transmits a second signaling on a sidelink; at least one measurement from the following set of measurements of: {a channel measurement for a third link, a channel measurement for a fourth link} is used for determining the first information; a radio channel from the first node to a transmitter of the first information corresponds to the third link, and a radio channel from the second node to the transmitter of the first information corresponds to the fourth link; the second signaling is used for triggering the transmission of the first information; at least one measurement from the following set of measurements of: {a channel measurement for a first link, a channel measurement for a second link} is used for determining the second signaling; and a radio channel from the first node to the transmitter of the first radio signal corresponds to the first link, and a radio channel from the second node to the transmitter of the first radio signal corresponds to the second link.

15. The UE according to claim 14 , wherein the second signaling is a physical layer signaling, or the second signaling is used for triggering the transmission of the first information, and at least one of {channel measurement for the first link, channel measurement for the second link} is used for determining the second signaling, or a first parameter is a result of channel measurement for the first link, and a second parameter is a result of channel result for the second link, if the first parameter and the second parameter meet a first condition, the UE transmits the second signaling, otherwise, the UE does not transmit the second signaling, the first condition is that the first parameter is less than the second parameter or the first condition is that the sum of the first parameter and a first offset value is less than the second parameter.

16. The UE according to claim 9 , wherein the first processing module hands over from the serving cell to the neighbor cell, and the second processing module transmits a third radio signal; the receiving timing for the neighbor cell is for determining the transmitting timing of the third radio signal.