Method and apparatus for PDCCH monitoring configuration for carrier aggregation in mobile communications

1. A method, comprising:

transmitting, by a processor of an apparatus, a capability report to indicate a plurality of monitoring combinations of physical downlink control channel (PDCCH) monitoring capabilities to a network node;

receiving, by the processor, a monitoring combination configured by the network node based on the capability report;

determining, by the processor, a monitoring budget by using the configured monitoring combination; and

performing, by the processor, a PDCCH monitoring according to the monitoring budget by using the monitoring combination configured by the network node responsive to a number of component carriers (CCs) configured being larger than a reported capability,

wherein each of the monitoring combinations comprises a first supported number of CCs with a first PDCCH monitoring capability and a second supported number of CCs with a second PDCCH monitoring capability, and

wherein the receiving comprises receiving the monitoring combination for scaling of the PDCCH monitoring capability via a radio resource control (RRC) signaling.

2. The method of claim 1 , wherein the configured monitoring combination for scaling of the PDCCH monitoring capability is selected from the plurality of monitoring combinations indicated by the capability report.

3. The method of claim 1 , wherein the first PDCCH monitoring capability comprises a slot-based PDCCH monitoring capability, and wherein the second PDCCH monitoring capability comprises a span-based PDCCH monitoring capability.

4. The method of claim 1 , wherein the first PDCCH monitoring capability comprises a Release-15 PDCCH blind detection capability, and wherein the second PDCCH monitoring capability comprises a Release-16 PDCCH blind detection capability.

5. The method of claim 1 , wherein the configured monitoring combination for scaling of the PDCCH monitoring capability is received in response to that a number of CCs configured is larger than the reported PDCCH monitoring capability.

6. The method of claim 1 , wherein the determining comprises determining the monitoring budget by using the configured monitoring combination to scale the PDCCH monitoring capabilities.

7. The method of claim 1 , wherein the configured monitoring combination is different from the plurality of monitoring combinations indicated by the capability report.

8. The method of claim 1 , wherein the configured monitoring combination comprises a combination indicator of PDCCH blind detection under carrier aggregation.

9. The method of claim 1 , wherein the determining comprises determining a first number of CCs to monitor with the first PDCCH monitoring capability and a second number of CCs to monitor with the second PDCCH monitoring capability.

10. An apparatus, comprising:

a transceiver which, during operation, wirelessly communicates with a network node of a wireless network; and

a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising:

transmitting, via the transceiver, a capability report to indicate a plurality of monitoring combinations of physical downlink control channel (PDCCH) monitoring capabilities to a network node;

receiving, via the transceiver, a monitoring combination configured by the network node based on the capability report;

determining a monitoring budget by using the configured monitoring combination; and

performing a PDCCH monitoring according to the monitoring budget by using the monitoring combination configured by the network node responsive to a number of component carriers (CCs) configured being larger than a reported capability,

wherein each of the monitoring combinations comprises a first supported number of CCs with a first PDCCH monitoring capability and a second supported number of CCs with a second PDCCH monitoring capability, and

wherein, in receiving the monitoring combination, the processor receives the monitoring combination for scaling of the PDCCH monitoring capability via a radio resource control (RRC) signaling.

11. The apparatus of claim 10 , wherein the configured monitoring combination for scaling of the PDCCH monitoring capability is selected from the plurality of monitoring combinations indicated by the capability report.

12. The apparatus of claim 10 , wherein the first PDCCH monitoring capability comprises a slot-based PDCCH monitoring capability, and wherein the second PDCCH monitoring capability comprises a span-based PDCCH monitoring capability.

13. The apparatus of claim 10 , wherein the first PDCCH monitoring capability comprises a Release-15 PDCCH blind detection capability, and wherein the second PDCCH monitoring capability comprises a Release-16 PDCCH blind detection capability.

14. The apparatus of claim 10 , wherein the configured monitoring combination for scaling of the PDCCH monitoring capability is received in response to that a number of CCs configured is larger than a reported PDCCH monitoring capability.

15. The apparatus of claim 10 , wherein, in determining the monitoring budget, the processor determines the monitoring budget by using the configured monitoring combination to scale the PDCCH monitoring capabilities.

16. The apparatus of claim 10 , wherein the configured monitoring combination is different from the plurality of monitoring combinations indicated by the capability report.

17. The apparatus of claim 10 , wherein the configured monitoring combination comprises a combination indicator of PDCCH blind detection under carrier aggregation.

18. The apparatus of claim 10 , wherein, in determining the monitoring budget, the processor determines a first number of CCs to monitor with the first PDCCH monitoring capability and a second number of CCs to monitor with the second PDCCH monitoring capability.