Method and device for wireless communication on random access

1. A first node for wireless communication, comprising:

a first receiver, to receive a first signaling, the first signaling comprising a first identifier and a second identifier; and

a first transmitter, to transmit a first signal;

wherein the first signaling is used for determining a first time-frequency resource set and a second time-frequency resource set, the first time-frequency resource set and the second time-frequency resource set are associated to the first identifier and the second identifier respectively, the first time-frequency resource set and the second time-frequency resource set are both used for random access; the first signal is transmitted in the second time-frequency resource set; the first identifier is associated only to a first cell, the second identifier is associated to a first cell group, the first cell group comprises K1 cells, and the K1 is a positive integer greater than 1; the first signal is used for determining a target cell, the target cell is one of the K1 cells, and the first cell is one cell in the first cell group; the first signaling is received from the first cell, the first signaling includes a System Information Block (SIB); when the first node selects to transmit the first signal in the second time-frequency resource set, the first node terminates the random access process initiated in the first time-frequency resource set.

2. The first node according to claim 1 , wherein the first signal is used for determining K2 candidate cells, and the target cell is one of the K2 candidate cells.

3. The first node according to claim 1 , wherein the first signaling comprises a third identifier, a cell to which the first node is attached is the first cell among the K1 cells, the third identifier is used for identifying the first cell among the K1 cells; and the third identifier is different from the first identifier.

4. The first node according to claim 1 , comprising:

the first receiver receives a second signal in a third time-frequency resource set;

wherein the second time-frequency resource set is used for determining the third time-frequency resource set; whether the second signal comprises the second identifier is used for determining whether a transmitter of the second signal receives the first signal.

5. The first node according to claim 1 , comprising:

the first receiver receives a second signal in a third time-frequency resource set;

wherein the target cell is used for determining the third time-frequency resource set; whether the second signal comprises the second identifier is used for determining whether a transmitter of the second signal receives the first signal.

6. The first node according to claim 4 , wherein

a signal transmitted in the second time-frequency resource set and a signal transmitted in the third time-frequency resource set are associated to a same Synchronization Signal Block (SSB).

7. The first node according to claim 2 , wherein the first signal is used for indicating second information, and the second information is used for indicating priorities of the K2 candidate cells.

8. The first node according to claim 2 , comprising:

the first transmitter transmits third information, the third information is used for indicating a first time set, time values in the first time set are associated to the K2 candidate cells, the first time set comprises a first time value, and the first time value is used for indicating a maximum length of service time for which the first node is served by a cell associated to the first time value.

9. The first node according to claim 1 , wherein the target cell has control plane and the target cell is not the first cell.

10. The first node according to claim 1 , wherein

the first time-frequency resource set and the second time-frequency resource set have an association relationship in time or frequency, and, through indicating one of the time-frequency resource sets, the first signaling indicates implicitly the other time-frequency resource set.

11. The first node according to claim 2 , wherein the first time-frequency resource set and the second time-frequency resource set have an association relationship in time or frequency, and, through indicating one of the time-frequency resource sets, the first signaling indicates implicitly the other time-frequency resource set.

12. A second node for wireless communication, comprising:

a second transmitter, to transmit a first signaling, the first signaling comprising a first identifier and a second identifier; and

a second receiver, to receive a first signal;

wherein the first signaling is used for determining a first time-frequency resource set and a second time-frequency resource set, the first time-frequency resource set and the second time-frequency resource set are associated to the first identifier and the second identifier respectively, the first time-frequency resource set and the second time-frequency resource set are both used for random access; the first signal is transmitted in the second time-frequency resource set; the first identifier is associated only to a first cell, the second identifier is associated to a first cell group, the first cell group comprises K1 cells, and the K1 is a positive integer greater than 1; the first signal is used for determining a target cell, the target cell is one of the K1 cells, and the first cell is one cell in the first cell group; the first signaling is received from the first cell, the first signaling includes a System Information Block (SIB) wherein the first signaling comprises a third identifier, a cell to which a transmitter of the first signal is attached is the first cell among the K1 cells, the third identifier is used for identifying the first cell among the K1 cells; and the third identifier is different from the first identifier.

13. The second node according to claim 12 , wherein the first signal is used for determining K2 candidate cells, and the target cell is one of the K2 candidate cells.

14. The second node according to claim 12 , wherein the second transmitter transmits a second signal in a third time-frequency resource set;

wherein the second time-frequency resource set is used for determining the third time-frequency resource set; whether the second signal comprises the second identifier is used for determining whether a transmitter of the second signal receives the first signal.

15. The second node according to claim 12 , comprising:

the second transmitter transmits a second signal in a third time-frequency resource set;

wherein the target cell is used for determining the third time-frequency resource set; whether the second signal comprises the second identifier is used for determining whether a transmitter of the second signal receives the first signal.

16. The second node according to claim 14 , wherein

a signal transmitted in the second time-frequency resource set and a signal transmitted in the third time-frequency resource set are associated to a same SSB.

17. The second node according to claim 13 , comprising:

the second receiver receives third information, the third information is used for indicating a first time set, time values in the first time set are associated to the K2 candidate cells, the first time set comprises a first time value, and the first time value is used for indicating a maximum length of service time for which the transmitter of the first signal is served by a cell associated to the first time value.

18. A method in a first node for wireless communication, comprising:

receiving a first signaling, the first signaling comprising a first identifier and a second identifier; and

transmitting a first signal;

wherein the first signaling is used for determining a first time-frequency resource set and a second time-frequency resource set, the first time-frequency resource set and the second time-frequency resource set are associated to the first identifier and the second identifier respectively, the first time-frequency resource set and the second time-frequency resource set are both used for random access; the first signal is transmitted in the second time-frequency resource set; the first identifier is associated only to a first cell, the second identifier is associated to a first cell group, the first cell group comprises K1 cells, and the K1 is a positive integer greater than 1; the first signal is used for determining a target cell, the target cell is one of the K1 cells, and the first cell is one cell in the first cell group; the first signaling is received from the first cell, the first signaling includes a System Information Block (SIB); when the first node selects to transmit the first signal in the second time-frequency resource set, the first node terminates the random access process initiated in the first time-frequency resource set.

19. A method in a second node for wireless communication, comprising:

transmitting a first signaling, the first signaling comprising a first identifier and a second identifier; and

receiving a first signal;

wherein the first signaling is used for determining a first time-frequency resource set and a second time-frequency resource set, the first time-frequency resource set and the second time-frequency resource set are associated to the first identifier and the second identifier respectively, the first time-frequency resource set and the second time-frequency resource set are both used for random access; the first signal is transmitted in the second time-frequency resource set; the first identifier is associated only to a first cell, the second identifier is associated to a first cell group, the first cell group comprises K1 cells, and the K1 is a positive integer greater than 1; the first signal is used for determining a target cell, the target cell is one of the K1 cells, and the first cell is one cell in the first cell group; the first signaling is received from the first cell, the first signaling includes a System Information Block (SIB); wherein the first signaling comprises a third identifier, a cell to which a transmitter of the first signal is attached is the first cell among the K1 cells, the third identifier is used for identifying the first cell among the K1 cells; and the third identifier is different from the first identifier.