Common search space for EPDCCH in LTE

1. A method of wireless communication, comprising:

determining, at a user equipment (UE), a first virtual cell ID for a common search space (CSS) enhanced physical downlink control channel (EPDCCH);

determining, at the UE, a second virtual cell ID for a user equipment search space (UESS) EPDCCH;

statically updating the first virtual cell ID based on a virtual cell ID statically configured for the UE and dynamically updating the second virtual cell ID based on a virtual cell ID dynamically indicated to the UE; and

processing an EPDCCH based on the determined first and second virtual cell IDs.

2. The method of claim 1 , in which the first virtual cell ID is the same as a physical cell ID (PCI).

3. The method of claim 1 , further comprising determining a plurality of different virtual cell IDs for the CSS EPDCCH, a first of the plurality corresponding to a first type of radio network temporary identifier (RNTI) and a second of the plurality corresponding to a second type of RNTI different from the first type.

4. The method of claim 3 , in which the first type of RNTI comprises at least one of a system information (SI)-RNTI, a paging RNTI, or a random access RNTI; and

in which the second type of RNTI comprises at least one of a transmit power control (TPC) physical uplink shared data channel (PUSCH) RNTI or a TPC physical uplink control channel (PUCCH) RNTI.

5. The method of claim 1 , further comprising broadcasting the determined first virtual cell ID.

6. The method of claim 1 , further comprising supporting a multimedia broadcast multicast service (MBMS) radio network temporary identifier (RNTI) in at least one of the CSS EPDCCH or UESS EPDCCH.

7. The method of claim 1 , further comprising assigning a higher priority to the CSS EPDCCH.

8. The method of claim 1 , further comprising assigning a higher priority to the UESS EPDCCH.

9. The method of claim 1 , further comprising prioritizing the CSS EPDCCH and UESS EPDCCH based on a predetermined parameter.

10. The method of claim 1 , further comprising:

determining at least one resource element (RE) assigned to a common reference signal (CRS) of a serving cell;

mapping the CSS EPDCCH to at least one other resource element; and

rate matching the UESS EPDCCH around the at least one RE assigned to the CRS, in which the CSS EPDCCH has a rate matching that is different from a rate matching of the UESS EPDCCH.

11. A user equipment (UE) for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory, the at least one processor being configured:

to determine a first virtual cell ID for a common search space (CSS) enhanced physical downlink control channel (EPDCCH);

to determine a second virtual cell ID for a user equipment search space (UESS) EPDCCH;

to statically update the first virtual cell ID based on a virtual cell ID statically configured for the UE and to dynamically update the second virtual cell ID based on a virtual cell ID dynamically indicated to the UE; and

to process an EPDCCH based on the determined first and second virtual cell IDs.

12. The UE of claim 11 , in which the first virtual cell ID is the same as a physical cell ID (PCI).

13. The UE of claim 11 , in which the at least one processor is further configured to determine a plurality of different virtual cell IDs for the CSS EPDCCH, a first of the plurality corresponding to a first type of radio network temporary identifier (RNTI) and a second of the plurality corresponding to a second type of RNTI different from the first type.

14. The UE of claim 13 , in which the first type of RNTI comprises at least one of a system information (SI)-RNTI, a paging RNTI, or a random access RNTI; and in which the second type of RNTI comprises at least one of a transmit power control (TPC) physical uplink shared data channel (PUSCH) RNTI or a TPC physical uplink control channel (PUCCH) RNTI.

15. The UE of claim 11 , in which the at least one processor is further configured to broadcast the determined first virtual cell ID.

16. The UE of claim 11 , in which the at least one processor is further configured to support multimedia broadcast and a multicast service (MBMS) radio network temporary identifier (RNTI) in at least one of the CSS EPDCCH or DESS EPDCCH.

17. The UE of claim 11 , in which the at least one processor is further configured to assign a higher priority to the CSS EPDCCH.

18. The UE of claim 11 , in which the at least one processor is further configured to assign a higher priority to the UESS EPDCCH.

19. The UE of claim 11 , in which the at least one processor is further configured to prioritize the CSS EPDCCH and UESS EPDCCH based on a predetermined parameter.

20. The UE of claim 11 , in which the at least one processor is further configured:

to determine at least one resource element (RE) assigned to a common reference signal (CRS) of a serving cell;

to map the CSS EPDCCH to at least one other resource element; and

to rate match the UESS EPDCCH around the at least one RE assigned to the CRS, in which the CSS EPDCCH has a rate matching that is different from a rate matching of the UESS EPDCCH.

21. A non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising:

program code to determine, at a user equipment (UE), a first virtual cell ID for a common search space (CSS) enhanced physical downlink control channel (EPDCCH);

program code to determine, at the UE, a second virtual cell ID for a user equipment search space (UESS) EPDCCH;

program code to statically update the first virtual cell ID based on a virtual cell ID statically configured for the UE and dynamically update the second virtual cell ID based on a virtual cell ID dynamically indicated to the UE; and

program code to process an EPDCCH based on the determined first and second virtual cell IDs.

22. An apparatus for wireless communication, comprising:

means for determining, at a user equipment (UE), a first virtual cell ID for a common search space (CSS) enhanced physical downlink control channel (EPDCCH);

means for determining, at the UE, a second virtual cell ID for a user equipment search space (DESS) EPDCCH;

means for statically updating the first virtual cell ID based on a virtual cell ID statically configured for the UE and dynamically updating the second virtual cell ID based on a virtual cell ID dynamically indicated to the UE; and

means for processing an EPDCCH based on the determined first and second virtual cell IDs.