METHOD AND APPARATUS FOR RECEIVING CONTROL INFORMATION THROUGH EPDCCH IN WIRELESS COMMUNICATION SYSTEM

• US 20150146639A1
• Filed: 06/07/2013
• Published: 05/28/2015
• 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
• Granted Patent: US 9,537,634 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• 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 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 the indexed EREGs in units of an Enhanced Control Channel Element (ECCE); and

determining 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 a common search space overlaps with the UE-specific search space.

2. The method according to claim 1, wherein if the specific resource unit for the common search space overlaps with the UE-specific search space, the UE excludes the specific resource unit from the EREG indexing or the ECCE indexing.

3. The method according to claim 1, wherein if the specific resource unit for the common search space overlaps with the UE-specific search space, the UE skips an EPDCCH candidate including the specific resource unit during the blind decoding.

4. The method according to claim 1, wherein if the specific resource unit for the common search space overlaps with the UE-specific search space, the UE determines an EPDCCH candidate using a resource apart from the specific resource unit by an offset.

5. The method according to claim 4, wherein the resource apart from the specific resource unit by the offset is not included either the common search space or the UE-specific search space.

6. The method according to claim 1, wherein a scheduling request is transmitted in a resource configured for transmission of an ACKnowledgement/Negative ACKnowledgement (ACK/NACK) related to the specific resource unit.

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

8. The method according to claim 1, wherein the specific resource unit is indicated by higher-layer signaling.

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

10. The method according to claim 9, wherein the common search space is located in the PRB set of the subframe.

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

12. 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.

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

a reception module; and

a processor,

wherein the processor is configured to index Resource Elements (REs) included in a Physical Resource Block (PRB) set of a received subframe in units of an Enhanced Resource Element Group (EREG), to index the indexed EREGs in units of an Enhanced Control Channel Element (ECCE), determine EPDCCH candidates forming a UE-specific search space based on the indexed ECCEs, and to perform blind decoding on the determined EPDCCH candidates, and

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