Method for cell reselection in space-air-ground integrated network, and terminal

1 . A method for cell reselection in a Space-Air-Ground Integrated Network, performed by a terminal, comprising:

monitoring broadcast message, and obtaining coverage information of a serving cell and coverage information of a neighboring cell from the broadcast message, wherein the serving cell and the neighboring cell are non-terrestrial network cells or terrestrial network cells;

determining, in response to determining that the serving cell is a non-terrestrial network cell, location relationship information between the terminal and the serving cell according to the coverage information of the serving cell, and initiating cell reselection measurement according to the location relationship information between the terminal and the serving cell; and

performing cell reselection according to a cell reselection measurement result, wherein the cell reselection measurement result comprises measurement information of a wireless signal of the neighboring cell and movement information of the terminal, and performing the cell reselection according to the cell reselection measurement result comprises:

determining a first candidate cell set according to the measurement information of the wireless signal of the neighboring cell; and

selecting a target cell for camping from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell.

2 . The method according to claim 1 , further comprising initiating, in response to determining that the serving cell is a terrestrial network cell, the cell reselection measurement according to a wireless signal strength of the serving cell.

3 . The method according to claim 1 , wherein the movement information of the terminal comprises one or more of a movement direction and a movement speed.

4 . The method according to claim 1 , wherein determining the first candidate cell set according to the measurement information of the wireless signal of the neighboring cell comprises:

determining a neighboring cell satisfying an R criterion as the first candidate cell set according to the measurement information of the wireless signal of the neighboring cell.

5 . The method according to claim 3 , wherein selecting the target cell for camping from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell comprises at least one of:

in response to determining that the serving cell is a non-terrestrial network cell and all neighboring cells are non-terrestrial network cells, selecting a candidate cell with a longest expected camping time from the first candidate cell set as the target cell for camping according to the movement information of the terminal and the coverage information of the neighboring cell;

in response to determining that the serving cell is a non-terrestrial network cell and all neighboring cells are terrestrial network cells, taking a candidate cell with a highest priority in the first candidate cell set as the target cell for camping according to an R criterion; or

in response to determining that the serving cell is a non-terrestrial network cell and neighboring cells comprise a non-terrestrial network cell and a terrestrial network cell, selecting a candidate cell in a same direction as the movement direction of the terminal from the first candidate cell set as a second candidate cell set according to the movement direction of the terminal and the coverage information of the neighboring cell, and selecting the target cell for camping from the second candidate cell set according to the movement speed of the terminal.

6 . The method according to claim 3 , wherein selecting the target cell for camping from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell comprises at least one of:

in response to determining that the serving cell is a terrestrial network cell and all neighboring cells are non-terrestrial network cells, selecting a candidate cell with a longest expected camping time from the first candidate cell set as the target cell for camping according to the movement information of the terminal and the coverage information of the neighboring cell;

in response to determining that the serving cell is a terrestrial network cell and all neighboring cells are terrestrial network cells, taking a candidate cell with a highest priority in the first candidate cell set as the target cell for camping according to an R criterion; or

in response to determining that the serving cell is a terrestrial network cell and neighboring cells comprise a non-terrestrial network cell and a terrestrial network cell, selecting a candidate cell in a same direction as the movement direction of the terminal from the first candidate cell set as a second candidate cell set according to the movement direction of the terminal and the coverage information of the neighboring cell, and selecting the target cell for camping from the second candidate cell set according to the movement speed of the terminal.

7 . The method according to claim 5 , wherein selecting the target cell for camping from the second candidate cell set according to the movement speed of the terminal comprises at least one of:

in response to determining that the movement speed of the terminal is higher than a speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell for camping; and

in response to determining that the movement speed of the terminal is not higher than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell for camping.

8 . The method according to claim 1 , wherein the coverage information is used for describing a boundary of a cell.

9 . The method according to claim 8 , wherein,

the coverage information is further used for implicitly indicating a type of the cell;

the broadcast message further comprises indication information used for indicating the type of the cell; and

wherein the type of the cell comprises a non-terrestrial network cell and a terrestrial network cell.

10 . The method according to claim 1 , wherein the coverage information comprises a cell center location and a cell radius.

11 . The method according to claim 1 , wherein initiating cell reselection measurement according to the location relationship information between the terminal and the serving cell comprises:

initiating the cell reselection measurement in response to determining that a distance between the terminal and the serving cell is greater than a distance threshold.

12 . The method according to claim 2 , wherein initiating cell reselection measurement according to the wireless signal strength of the serving cell comprises:

initiating the cell reselection measurement in response to determining that the wireless signal strength of the serving cell is lower than an intensity threshold.

13 . The method according to claim 3 , wherein selecting the target cell for camping from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell comprises:

selecting a candidate cell in a same direction as the movement direction of the terminal from the first candidate cell set as a second candidate cell set according to the movement direction of the terminal and the coverage information of the neighboring cell, and selecting a candidate cell with a different type from the serving cell from the second candidate cell set as the target cell for camping, wherein a type of the serving cell is a non-terrestrial network cell or a terrestrial network cell.

14 . A method for cell reselection in a Space-Air-Ground Integrated Network, performed by a communication device, comprising:

sending a broadcast message, wherein the broadcast message comprises coverage information of a present cell and coverage information of a neighboring cell, and the present cell and the neighboring cell are non-terrestrial network cells or terrestrial network cells, thus directing a terminal to perform cell reselection according to the broadcast message;

wherein the present cell is a non-terrestrial network cell, the coverage information of the present cell is used by the terminal to determine location relationship information between the terminal and the present cell, the location relationship information between the terminal and the present cell is used by the terminal to initiate cell reselection measurement, and a cell reselection measurement result is used by the terminal to perform the cell reselection;

wherein the cell reselection measurement result comprises measurement information of a wireless signal of the neighboring cell and movement information of the terminal;

and wherein, the measurement information of the wireless signal of the neighboring cell is used by the terminal to determine a first candidate cell set, and the movement information of the terminal and the coverage information of the neighboring cell are used by the terminal to select a target cell for camping from the first candidate cell set.

15 . The method according to claim 14 , wherein the coverage information is used for describing a boundary of a cell.

16 . The method according to claim 15 , wherein:

the coverage information is further used for implicitly indicating a type of the cell;

the broadcast message further comprises indication information used for indicating the type of the cell; and

wherein the type of the cell comprises a non-terrestrial network cell and a terrestrial network cell.

17 . A terminal, comprising:

a memory; and

a processor in data communication with the memory, wherein the processor is configured to execute a method for cell reselection in a Space-Air-Ground Integrated Network based on program instruction stored in the memory, and the method comprising:

monitoring broadcast message, and obtaining coverage information of a serving cell and coverage information of a neighboring cell from the broadcast message, wherein the serving cell and the neighboring cell are non-terrestrial network cells or terrestrial network cells;

determining, in response to determining that the serving cell is a non-terrestrial network cell, location relationship information between the terminal and the serving cell according to the coverage information of the serving cell, and initiating cell reselection measurement according to the location relationship information between the terminal and the serving cell; and

performing cell reselection according to a cell reselection measurement result, wherein the cell reselection measurement result comprises measurement information of a wireless signal of the neighboring cell and movement information of the terminal, and performing the cell reselection according to the cell reselection measurement result comprises:

determining a first candidate cell set according to the measurement information of the wireless signal of the neighboring cell; and

selecting a target cell for camping from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell.

18 . A communication device, comprising:

a memory; and

a processor in data communication with the memory, wherein the processor is configured to execute the method for cell reselection in a Space-Air-Ground Integrated Network according to claim 15 based on an instruction stored in the memory.

19 . A communication system, comprising: the terminal according to claim 17 .