Carrier switching method and apparatus, and terminal device and readable storage medium

1 . A carrier switching method, comprising:

determining a candidate secondary carrier based on a selection strategy;

in response to a subcarrier spacing (SCS) of the candidate secondary carrier being equal to a SCS of a primary carrier, searching sequentially from a first slot interval until an available resource on the candidate secondary carrier is found, or until a first K1′ slot position is reached; wherein the first slot interval is a slot position corresponding to when K1 is equal to 1, a K1′ slot position comprises the first K1′ slot position, and the first K1′ slot position is equal to a K1 slot position, wherein the K1′ slot position is a slot position corresponding to the K1 slot position of the primary carrier on the candidate secondary carrier, wherein K1 and K1′ are positive integers; and

in response to an available resource existing on the candidate secondary carrier, determining the candidate secondary carrier as a target secondary carrier, wherein the target secondary carrier is a switched secondary carrier in a carrier switching scenario of a physical channel.

2 . The method according to claim 1 , wherein the selection strategy comprises at least one of: a first selection strategy, a second selection strategy, or a third selection strategy;

wherein the first selection strategy comprises: selecting a first secondary carrier with a same SCS as the primary carrier as the candidate secondary carrier;

the second selection strategy comprises: selecting a second secondary carrier using a symmetrical frequency spectrum as the candidate secondary carrier; and

the third selection strategy comprises: selecting a third secondary carrier in a descending order of SCS among secondary carriers using an asymmetric spectrum, as the candidate secondary carrier.

3 . The method according to claim 2 , wherein

a priority of the first selection strategy is higher than a priority of the second selection strategy.

4 . The method according to claim 2 , wherein

a priority of the second selection strategy is higher than a priority of the third selection strategy.

5 . The method according to claim 1 , wherein a SCS of the candidate secondary carrier is greater than a SCS of the primary carrier, the K1′ slot position comprises a second K1′ slot position and a third K1′ slot position, a value of the second K1′ slot position is equal to the SCS of the candidate secondary carrier/the SCS of the primary carrier*(K1−1)+1, and a value of the third K1′ slot position is equal to the SCS of the candidate secondary carrier/the SCS of the primary carrier/*K1;

the method further comprises:

searching sequentially from the second K1′ slot position until the available resource on the candidate secondary carrier is found, or until the third K1′ slot position is reached.

6 . The method according to claim 1 , wherein a SCS of the candidate secondary carrier is smaller than a SCS of the primary carrier, the K1′ slot position comprises a fourth K1′ slot position, a value of the fourth K1′ slot position is equal to upward rounding of (the SCS of the candidate secondary carrier/the SCS of the primary carrier*K1);

the method further comprises:

searching sequentially from a first symbol position of the fourth K1′ slot position until the available resource on the candidate secondary carrier is found and determined, or until a last symbol position of the fourth K1′ slot position is reached.

7 . The method according to claim 1 , further comprising:

performing transmission on the physical channel on the available resource of the target secondary carrier.

8 . The method according to claim 1 , wherein the physical channel comprises at least one of:

a physical uplink control channel (PUCCH);

a physical uplink shared channel (PUSCH);

a physical downlink control channel (PDCCH); or

a physical downlink shared channel (PDSCH).

9 . A carrier switching apparatus, comprising:

a processor; and

a memory storing instructions executable by the processor,

wherein the processor is configured to:

determine a candidate secondary carrier based on a selection strategy;

in response to a subcarrier spacing (SCS) of the candidate secondary carrier being equal to a SCS of a primary carrier, search sequentially from a first slot interval until an available resource on the candidate secondary carrier is found, or until a first K1′ slot position is reached, wherein the first slot interval is a slot position when K1 is equal to 1, a K1′ slot position comprises the first K1′ slot position, and the first K1′ slot position is equal to a K1 slot position, wherein the K1′ slot position is a slot position corresponding to the K1 slot position of the primary carrier on the candidate secondary carrier, wherein K1 and K1′ are positive integers; and

determine the candidate secondary carrier as a target secondary carrier in response to an available resource existing on the candidate secondary carrier, wherein the target secondary carrier is a switched secondary carrier in a carrier switching scenario of a physical channel.

10 . The apparatus according to claim 9 , wherein the selection strategy comprises at least one of: a first selection strategy; a second selection strategy; or a third selection strategy;

wherein the first selection strategy comprises: selecting a first secondary carrier with a same SCS as the primary carrier as the candidate secondary carrier;

the second selection strategy comprises: selecting a second secondary carrier using a symmetrical frequency spectrum as the candidate secondary carrier; and

the third selection strategy comprises: selecting a third secondary carrier in a descending order of SCS among secondary carriers using an asymmetric spectrum, as the candidate secondary carrier.

11 . The apparatus according to claim 10 , wherein

a priority of the first selection strategy is higher than a priority of the second selection strategy.

12 . The apparatus according to claim 10 , wherein

a priority of the second selection strategy is higher than a priority of the third selection strategy.

13 . The apparatus according to claim 9 , wherein a SCS of the candidate secondary carrier is greater than a SCS of the primary carrier, the K1′ slot position comprises a second K1′ slot position and a third K1′ slot position, a value of the second K1′ slot position is equal to the SCS of the candidate secondary carrier/the SCS of the primary carrier*(K1−1)+1, and a value of the third K1′ slot position is equal to the SCS of the candidate secondary carrier/the SCS of the primary carrier/*K1; and

the processor is further configured to search sequentially from the second K1′ slot position until the available resource on the candidate secondary carrier is found, or until the third K1′ slot position is reached.

14 . The apparatus according to claim 9 , wherein a SCS of the candidate secondary carrier is smaller than a SCS of the primary carrier, the K1′ slot position comprises a fourth K1′ slot position, a value of the fourth K1′ slot position is equal to upward rounding of (the SCS of the candidate secondary carrier/the SCS of the primary carrier*K1); and

the processor is further configured to search sequentially from a first symbol position of the fourth K1′ slot position until the available resource on the candidate secondary carrier is found and determined, or until a last symbol position of the fourth K1′ slot position is reached.

15 . The apparatus according to claim 9 , wherein the processor is further configured to:

perform transmission on the physical channel on the available resource of the target secondary carrier.

16 . The apparatus according to claim 9 , wherein the physical channel comprises at least one of:

a physical uplink control channel (PUCCH);

a physical uplink shared channel (PUSCH);

a physical downlink control channel (PDCCH); or

a physical downlink shared channel (PDSCH).