Method and apparatus for multiple bandwidth parts operation in mobile communications

1. A method, comprising:

receiving, by a processor of an apparatus, a configuration of a plurality of bandwidth parts (BWPs) on an uplink (UL) or a sidelink (SL);

determining, by the processor, whether a restriction is met;

activating, by the processor, the plurality of BWPs on a same carrier according to the restriction; and

performing, by the processor, a transmission on at least one of a plurality of activated BWPs,

wherein the transmission on the at least one of the plurality of activated BWPs comprises a transmission on at least one activated BWP on the UL and simultaneously another transmission on at least one activated BWP on the SL, and

wherein the restriction at least comprises that activated BWPs during a simultaneous pair of transmissions are not allowed to have different numerology configurations.

2. The method of claim 1 , wherein the restriction comprises a restricted number of active BWPs among the plurality of BWPs, and wherein the activating comprises activating the restricted number of the active BWPs.

3. The method of claim 1 , wherein the restriction comprises a restricted carrier, and wherein the activating comprises activating the plurality of BWPs in the restricted carrier.

4. The method of claim 1 , wherein the restriction comprises that mixed numerologies among BWPs are not allowed, and wherein the activating comprises activating no BWPs.

5. The method of claim 1 , wherein the restriction comprises that mixed numerologies among BWPs are allowed with a limitation, and wherein the activating comprises activating the plurality of BWPs according to the limitation.

6. The method of claim 1 , further comprising:

determining, by the processor, whether to activate the plurality of BWPs according to a capability.

7. The method of claim 1 , wherein the restriction comprises that no simultaneous transmission on the plurality of BWPs is allowed, and wherein the performing comprises performing the transmission on one of the plurality of activated BWPs.

8. The method of claim 1 , further comprising:

determining, by the processor, whether a switching duration from a first BWP to a second BWP is not shorter than a guard period; and

performing, by the processor, a switch from the first BWP to the second BWP in an event that the switching duration is not shorter than the guard period.

9. The method of claim 1 , further comprising:

initiating, by the processor, an inactivity timer associated with at least one of the plurality of BWPs; and

deactivating, by the processor, at least one of the plurality of BWPs when the inactivity timer is expired.

10. The method of claim 1 , further comprising:

determining, by the processor, whether a total occupied frequency range of the plurality of BWPs is greater than an allowed frequency range; and

deactivating, by the processor, at least one of the plurality of BWPs in an event that the total occupied frequency range is greater than the allowed frequency range,

wherein the restriction comprises the allowed frequency range.

11. An apparatus, comprising:

a transceiver capable of wirelessly communicating with a network node of a wireless network; and

a processor communicatively coupled to the transceiver, the processor capable of:

receiving, via the transceiver, a configuration of a plurality of bandwidth parts (BWPs) on an uplink (UL) or a sidelink (SL);

determining whether a restriction is met;

activating the plurality of BWPs on a same carrier according to the restriction; and

performing, via the transceiver, a transmission on at least one of a plurality of activated BWPs,

wherein the transmission on the at least one of the plurality of activated BWPs comprises a transmission on at least one activated BWP on the UL and simultaneously another transmission on at least one activated BWP on the SL, and

wherein the restriction at least comprises that activated BWPs during a simultaneous pair of transmissions are not allowed to have different numerology configurations.

12. The apparatus of claim 11 , wherein the restriction comprises a restricted number of active BWPs among the plurality of BWPs, and wherein, in activating the plurality of BWPs according to the restriction, the processor is capable of activating the restricted number of the active BWPs.

13. The apparatus of claim 11 , wherein the restriction comprises a restricted carrier, and wherein, in activating the plurality of BWPs according to the restriction, the processor is capable of activating the plurality of BWPs in the restricted carrier.

14. The apparatus of claim 11 , wherein the restriction comprises that mixed numerologies among BWPs are not allowed, and wherein, in activating the plurality of BWPs according to the restriction, the processor is capable of activating no BWPs.

15. The apparatus of claim 11 , wherein the restriction comprises that mixed numerologies among BWPs are allowed with a limitation, and wherein, in activating the plurality of BWPs according to the restriction, the processor is capable of activating the plurality of BWPs according to the limitation.

16. The apparatus of claim 11 , wherein the processor is further capable of:

determining whether to activate the plurality of BWPs according to a capability.

17. The apparatus of claim 11 , wherein the restriction comprises that no simultaneous transmission on the plurality of BWPs is allowed, and wherein, in performing a transmission on at least one of the plurality of activated BWPs, the processor is capable of performing the transmission or reception on one of the plurality of activated BWPs.

18. The apparatus of claim 11 , wherein the processor is further capable of:

determining whether a switching duration from a first BWP to a second BWP is not shorter than a guard period; and

performing a switch from the first BWP to the second BWP in an event that the switching duration is not shorter than the guard period.

19. The apparatus of claim 11 , wherein the processor is further capable of:

initiating an inactivity timer associated with at least one of the plurality of BWPs; and

deactivating at least one of the plurality of BWPs when the inactivity timer is expired.

20. The apparatus of claim 11 , wherein the processor is further capable of:

determining whether a total occupied frequency range of the plurality of BWPs is greater than an allowed frequency range; and

deactivating at least one of the plurality of BWPs in an event that the total occupied frequency range is greater than the allowed frequency range,

wherein the restriction comprises the allowed frequency range.