Method and apparatus for receiving control information through EPDCCH in wireless communication system

• US 9,537,634 B2
• Filed: 06/07/2013
• Issued: 01/03/2017
• Est. Priority Date: 06/07/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon, Seo, Hanbyul
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): LOO, JUVENA W
• Application Number:
  US14/405,887
• Publication Number:
  US 20150146639A1
• Time in Patent Office: 1,306 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

Abstract

One embodiment of the present invention relates to a method for a terminal receiving control information through an enhanced physical downlink control channel (EPDCCH) in a wireless communication system, comprising the steps of: indexing resource elements (RE), which are included in a physical resource block (PRB) set of a received subframe, in units of enhanced resource element groups (EREG); indexing the EREGs that are indexed in units of enhanced control channel elements (ECCE); and determining EPDCCH candidates which comprise a terminal-specific search space on the basis of the ECCEs which are indexed, and then blind decoding same, wherein the terminal determines whether a predetermined resource unit for a common search space and the terminal-specific search space overlap.

Claims

1. A method for receiving control information on an Enhanced Physical Downlink Control Channel (EPDCCH) by a User Equipment (UE), the method comprising:

indexing, by the UE, Resource Elements (REs) included in a Physical Resource Block (PRB) set of a received subframe in units of an Enhanced Resource Element Group (EREG);

indexing, by the UE, the indexed EREGs in units of an Enhanced Control Channel Element (ECCE); and

determining, by the UE, EPDCCH candidates forming a UE-specific search space based on the indexed ECCEs and performing blind decoding on the determined EPDCCH candidates,

wherein the UE determines whether a specific resource unit of the UE-specific search space overlaps with a common search space,

wherein if the specific resource unit of the UE-specific search space overlaps with the common search space, the UE determines an EPDCCH candidate by replacing the specific resource unit among resource units of the UE-specific search space with another resource unit not included in either the common search space or the UE-specific search space.

2. The method according to claim 1, wherein the another resource unit is a resource unit apart from the specific resource unit by an offset.

3. The method according to claim 1, wherein the specific resource unit is one of an EREG and an ECCE.

4. The method according to claim 1, wherein at least one resource unit for the common search space is indicated by higher-layer signaling.

5. The method according to claim 1, wherein the PRB set is one of a distributed EPDCCH PRB set and a localized EPDCCH PRB set.

6. The method according to claim 5, wherein the common search space is located in the PRB set of the subframe.

7. The method according to claim 1, wherein the ECCE includes four EREGs.

8. The method according to claim 1, wherein a Physical Uplink Control Channel (PUCCH) for transmission of an ACK related to the common search space and the UE-specific search space is configured for each of the common search space and the UE-specific search space.

9. A User Equipment (UE) for receiving control information on an Enhanced Physical Downlink Control Channel (EPDCCH), the UE comprising:

a reception module; and

a processor that;

indexes Resource Elements (REs) included in a Physical Resource Block (PRB) set of a received subframe in units of an Enhanced Resource Element Group (EREG),

indexes the indexed EREGs in units of an Enhanced Control Channel Element (ECCE),

determines EPDCCH candidates forming a UE-specific search space based on the indexed ECCEs, and performs blind decoding on the determined EPDCCH candidates,

wherein the processor determines whether a specific resource unit of the UE-specific search space overlaps with a common search space,

wherein if the specific resource unit of the UE-specific search space overlaps with the common search space, the UE determines an EPDCCH candidate by replacing the specific resource unit among resource units of the UE-specific search space with another resource unit not included in either the common search space or the UE-specific search space.