Common search space for EPDCCH in LTE

• US 9,338,773 B2
• Filed: 03/07/2013
• Issued: 05/10/2016
• Est. Priority Date: 03/26/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Luo, Tao, Chen, Wanshi, Gaal, Peter
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): Hunt, Kenneth P
• Application Number:
  US13/789,520
• Publication Number:
  US 20130250874A1
• Time in Patent Office: 1,160 Days
• Field of Search: 370/329
• US Class Current: 1/1
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method and apparatus for wireless communication manages virtual cell ID(s) for the common search. A UE determines a first virtual cell ID for a common search space (CSS) enhanced physical downlink control channel (EPDCCH) and determines a second virtual cell ID for a user equipment search space (UESS) EPDCCH. The UE processes EPDCCH based on the determined first and second virtual cell IDs.

Claims

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.