User equipment and method for handling switching time period of downlink-uplink switching for half duplex-frequency division duplex operation

1. A method performed by a user equipment (UE) for handling a switching time period of downlink (DL)-uplink (UL) switching for a half duplex-frequency division duplex (HD-FDD) operation, the method comprising:

receiving a first configuration for a first active bandwidth part (BWP) with a first sub-carrier spacing (SCS), the first active BWP being one of an active UL BWP and an active DL BWP;

receiving a second configuration for a second active BWP with a second SCS, the second active BWP being another one of the active UL BWP and the active DL BWP;

receiving a third configuration for the switching time period, the switching time period having a unit of symbol or having an absolute value;

performing communication with a Base Station (BS) on the first active BWP with the first SCS; and

performing, after the switching time period, communication with the BS on the second active BWP with the second SCS, wherein:

the communication on the second active BWP begins at a first starting symbol,

the switching time period begins at a second starting symbol, and

the second starting symbol is determined based on the first starting symbol.

2. The method according to claim 1 , wherein the first SCS is larger than the second SCS.

3. The method according to claim 1 , wherein:

the first active BWP is the active DL BWP,

the second active BWP is the active UL BWP, and

the switching time period includes a timing advance (TA) time period.

4. The method according to claim 1 , wherein a length of the switching time period is determined based on the second SCS.

5. A user equipment (UE) for handling a switching time period of downlink (DL)-uplink (UL) switching for a half duplex-frequency division duplex (HD-FDD) operation, the UE comprising:

one or more non-transitory computer-readable media storing one or more computer-executable instructions; and

at least one processor coupled to the one or more non-transitory computer-readable media, the at least one processor is configured to execute the one or more computer-executable instructions to:

receive a first configuration for a first active bandwidth part (BWP) with a first sub-carrier spacing (SCS), the first active BWP being one of an active UL BWP and an active DL BWP;

receive a second configuration for a second active BWP with a second SCS, the second active BWP being another one of the active UL BWP and the active DL BWP;

receive a third configuration for the switching time period, the switching time period having a unit of symbol or having an absolute value;

perform communication with a Base Station (BS) on the first active BWP with the first SCS; and

perform, after the switching time period, communication with the BS on the second active BWP with the second SCS, wherein:

the communication on the second active BWP begins at a first starting symbol,

the switching time period begins at a second starting symbol, and

the second starting symbol is determined based on the first starting symbol.

6. The UE according to claim 5 , wherein

the first SCS is larger than the second SCS.

7. The UE according to claim 5 , wherein:

the first active BWP is the active DL BWP,

the second active BWP is the active UL BWP, and

the switching time period includes a timing advance (TA) time period.

8. The UE according to claim 5 , wherein a length of the switching time period is determined based on the second SCS.