Uplink switching method, communication apparatus, and communication system

1. An uplink switching method applied to a communication apparatus, wherein the method comprises:

sending terminal capability information to an access network device, wherein the terminal capability information comprises switching time period information, the switching time period information indicates a switching time period for switching between supplementary uplink (SUL) and normal uplink (NUL), and the switching time period for the switching between the SUL and the NUL is longer than 0 microseconds;

performing transmission with the access network device on a first uplink carrier, wherein the first uplink carrier is one of the NUL and the SUL;

switching from the first uplink carrier to a second uplink carrier, wherein the second uplink carrier is the other one of the NUL and the SUL; and

performing transmission with the access network device on the second uplink carrier; and wherein

a quantity of multiple-input multiple-output (MIMO) layers supported by the SUL is 1, and a quantity of MIMO layers supported by the NUL is 2.

2. The method according to claim 1 , wherein 2 MIMO layers supported by the NUL are for physical uplink shared channel (PUSCH) transmission, and 1 MIMO layer supported by the SUL is for PUSCH transmission.

3. The method according to claim 1 , wherein:

the SUL works on a first radio frequency channel, and the NUL works on the first radio frequency channel and a second radio frequency channel, and

switching from the first uplink carrier to the second uplink carrier comprises:

switching the first radio frequency channel from the first uplink carrier to the second uplink carrier, wherein the switching time period for the switching between the SUL and the NUL comprises a switching time period for switching the first radio frequency channel from the first uplink carrier to the second uplink carrier.

4. The method according to claim 1 , wherein switching from the first uplink carrier to the second uplink carrier comprises:

switching from the first uplink carrier to the second uplink carrier within duration of a silent time domain resource, a preceding symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the first uplink carrier and a subsequent symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the second uplink carrier, and a length of the silent time domain resource is greater than or equal to a length of the switching time period for the switching between the SUL and the NUL.

5. The method according to claim 4 , wherein the method further comprises:

receiving SUL transmission time domain resource allocation information from the access network device, the SUL transmission time domain resource allocation information indicates the transmission time domain resource of the SUL;

receiving NUL transmission time domain resource allocation information from the access network device, the NUL transmission time domain resource allocation information indicates the transmission time domain resource of the NUL;

determining that a time domain resource from a subsequent symbol adjacent to transmission time domain resource of the SUL to a preceding symbol adjacent to the transmission time domain resource of the NUL is the silent time domain resource, wherein the first uplink carrier is the SUL, and the second uplink carrier is the NUL; or

determining that a time domain resource from a subsequent symbol adjacent to transmission time domain resource of the NUL to a preceding symbol adjacent to the transmission time domain resource of the SUL is the silent time domain resource, wherein the first uplink carrier is the NUL, and the second uplink carrier is the SUL.

6. The method according to claim 5 , wherein the SUL transmission time domain resource allocation information comprises SUL PUSCH time domain resource allocation information, and the transmission time domain resource of the SUL comprises an SUL PUSCH time domain resource; the NUL transmission time domain resource allocation information comprises NUL PUSCH time domain resource allocation information, and the transmission time domain resource of the NUL comprises an NUL PUSCH time domain resource; and the method further comprises:

receiving time division duplex (TDD) time domain resource allocation information from the access network device, wherein the TDD time domain resource allocation information indicates one or more of a TDD uplink time domain resource, a TDD downlink time domain resource, and a TDD flexible time domain resource;

wherein the NUL PUSCH time domain resource allocation information indicates that a part or all of the TDD uplink time domain resource is the NUL PUSCH time domain resource; and

wherein the SUL PUSCH time domain resource allocation information indicates that a part or all of the TDD flexible time domain resource and the TDD downlink time domain resource is the SUL PUSCH time domain resource.

7. The method according to claim 1 , wherein the performing transmission with the access network device on the SUL comprises:

performing transmission with the access network device on the SUL when a terminal is located within a coverage of the NUL.

8. An apparatus for a terminal, comprising one or more processors and one or more memories coupled to the one or more processors and storing programming instructions for execution by the one or more processors to causse the terminal to:

send terminal capability information to an access network device, wherein the terminal capability information comprises switching time period information, the switching time period information indicates a switching time period for switching between supplementary uplink (SUL) and normal uplink (NUL), and the switching time period for the switching between the SUL and the NUL is longer than 0 microseconds;

perform transmission with the access network device on a first uplink carrier, wherein the first uplink carrier is one of the NUL and the SUL;

switch from the first uplink carrier to a second uplink carrier, wherein the second uplink carrier is the other one of the NUL and the SUL; and

perform transmission with the access network device on the second uplink carrier; and wherein

a quantity of multiple-input multiple-output (MIMO) layers supported by the SUL is 1, and a quantity of MIMO layers supported by the NUL is 2.

9. The apparatus according to claim 8 , wherein 2 MIMO layers supported by the NUL are for physical uplink shared channel (PUSCH) transmission, and 1 MIMO layer supported by the SUL is for PUSCH transmission.

10. The apparatus according to claim 8 , wherein:

the SUL works on a first radio frequency channel, and the NUL works on the first radio frequency channel and a second radio frequency channel, and

the one or more memories store programming instructions for execution by the one or more processors to:

switch the first radio frequency channel from the first uplink carrier to the second uplink carrier wherein the switching time period for the switching between the SUL and the NUL comprises a switching time period for switching the first radio frequency channel from the first uplink carrier to the second uplink carrier.

11. The apparatus according to claim 8 , wherein the one or more memories store programming instructions for execution by the one or more processors to cause the terminal to:

switch from the first uplink carrier to the second uplink carrier within duration of a silent time domain resource, a preceding symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the first uplink carrier and a subsequent symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the second uplink carrier, and a length of the silent time domain resource is greater than or equal to a length of the switching time period for the switching between the SUL and the NUL.

12. The apparatus according to claim 11 , wherein the one or more memories store the programming instructions for execution by the one or more processors to cause the terminal to:

receive SUL transmission time domain resource allocation information from the access network device, the SUL transmission time domain resource allocation information indicates the transmission time domain resource of the SUL;

receive NUL transmission time domain resource allocation information in a second DCI from the access network device, the NUL transmission time domain resource allocation information indicates the transmission time domain resource of the NUL;

determine that a time domain resource from a subsequent symbol adjacent to transmission time domain resource of the SUL to a preceding symbol adjacent to the transmission time domain resource of the NUL is the silent time domain resource, wherein the first uplink carrier is the SUL, and the second uplink carrier is the NUL; or

determine that a time domain resource from a subsequent symbol adjacent to transmission time domain resource of the NUL to a preceding symbol adjacent to the transmission time domain resource of the SUL is the silent time domain resource, wherein the first uplink carrier is the NUL, and the second uplink carrier is the SUL.

13. The apparatus according to claim 12 , wherein the SUL transmission time domain resource allocation information comprises SUL PUSCH time domain resource allocation information, and the transmission time domain resource of the SUL comprises an SUL PUSCH time domain resource; the NUL transmission time domain resource allocation information comprises NUL PUSCH time domain resource allocation information, and the transmission time domain resource of the NUL comprises an NUL PUSCH time domain resource; and the one or more memories store the programming instructions for execution by the one or more processors to further cause the terminal to:

receive time division duplex (TDD) time domain resource allocation information from the access network device, wherein the TDD time domain resource allocation information indicates one or more of a TDD uplink time domain resource, a TDD downlink time domain resource, and a TDD flexible time domain resource;

wherein the NUL PUSCH time domain resource allocation information indicates that a part or all of the TDD uplink time domain resource is the NUL PUSCH time domain resource; and

wherein the SUL PUSCH time domain resource allocation information indicates that a part or all of the TDD flexible time domain resource and the TDD downlink time domain resource is the SUL PUSCH time domain resource.

14. The apparatus according to claim 8 , wherein the one or more memories store the programming instructions for execution by the one or more processors to cause the terminal to:

perform transmission with the access network device on the SUL when the terminal is located within a coverage of the NUL.

15. An apparatus for an access network device, comprising one or more processors and one or more memories coupled to the one or more processors and storing programming instructions for execution by the one or more processors to cause the access network device to:

receive terminal capability information from a terminal, wherein the terminal capability information comprises switching time period information, wherein the switching time period information indicates a switching time period for switching between supplementary uplink (SUL) and normal uplink (NUL), and the switching time period for the switching between the SUL and the NUL is longer than 0 microseconds;

perform transmission with the terminal on the SUL; and

perform transmission with the terminal on the NUL, and wherein

a quantity of multiple-input multiple-output (MIMO) layers supported by the SUL is 1, and a quantity of MIMO layers supported by the NUL is 2.

16. The apparatus according to claim 15 , wherein 2 MIMO layers supported by the NUL are for physical uplink shared channel (PUSCH) transmission, and 1 MIMO layer supported by the SUL is for PUSCH transmission.

17. The apparatus according to claim 16 , wherein:

the SUL works on a first radio frequency channel, and the NUL works on the first radio frequency channel and a second radio frequency channel, and the first radio frequency channel is switched between the SUL and the NUL; and

the switching time period for the switching between the SUL and the NUL comprises a switching time period for switching the first radio frequency channel between the SUL and the NUL.

18. The apparatus according to claim 15 , wherein the one or more memories store the programming instructions for execution by the one or more processors to cause the access network device to:

keep silent within duration of a silent time domain resource, wherein:

a preceding symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the SUL and a subsequent symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the NUL, and a length of the silent time domain resource is greater than or equal to a length of the switching time period for the switching between the SUL and the NUL; or

a preceding symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the NUL and a subsequent symbol adjacent to the silent time domain resource belongs to a transmission time domain resource of the SUL, and a length of the silent time domain resource is greater than or equal to a length of the switching time period for the switching between the SUL and the NUL.

19. The apparatus according to claim 18 , wherein the one or more memories store the programming instructions for execution by the one or more processors to cause the access network device to:

determine the silent time domain resource based on the switching time period information, wherein the silent time domain resource is used for the terminal's switching between the SUL and the NUL, and a length of the silent time domain resource is greater than or equal to a length of the switching time period for the switching between the SUL and the NUL;

send SUL transmission time domain resource allocation information to the terminal, the SUL transmission time domain resource allocation information indicates the transmission time domain resource of the SUL; and

send NUL transmission time domain resource allocation information to the terminal, the NUL transmission time domain resource allocation information indicates the transmission time domain resource of the NUL; and wherein

the transmission time domain resource of the SUL comprises a preceding symbol of the silent time domain resource, the transmission time domain resource of the NUL comprises a subsequent symbol of the silent time domain resource; or

the transmission time domain resource of the NUL comprises a preceding symbol of the silent time domain resource, the transmission time domain resource of the SUL comprises a subsequent symbol of the silent time domain resource.

20. The apparatus according to claim 19 , wherein the SUL transmission time domain resource allocation information comprises SUL PUSCH time domain resource allocation information, and the transmission time domain resource of the SUL comprises an SUL PUSCH time domain resource; the NUL transmission time domain resource allocation information comprises NUL PUSCH time domain resource allocation information, and the transmission time domain resource of the NUL comprises an NUL PUSCH time domain resource; and the one or more memories store the programming instructions for execution by the one or more processors to further cause the access network device to:

send time division duplex (TDD) time domain resource allocation information to the terminal, wherein the TDD time domain resource allocation information indicates one or more of a TDD uplink time domain resource, a TDD downlink time domain resource, and a TDD flexible time domain resource;

wherein the NUL PUSCH time domain resource allocation information indicates that a part or all of the TDD uplink time domain resource is the NUL PUSCH time domain resource; and

wherein the SUL PUSCH time domain resource allocation information indicates that a part or all of the TDD flexible time domain resource and the TDD downlink time domain resource is the SUL PUSCH time domain resource.