METHOD FOR TRANSCEIVING DOWNLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM, AND APPARATUS THEREFOR

• US 20150078277A1
• Filed: 03/27/2013
• Published: 03/19/2015
• Est. Priority Date: 04/01/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Hanbyul, Yang, Suckchel
• Granted Patent: US 9,609,639 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention relates to a method to receive an enhanced physical downlink control channel (EPDCCH) in a wireless communication system. More particularly, the method includes monitoring at least one EPDCCH candidate consisting of one or more enhanced control channel elements (ECCEs) in resource blocks and receiving the EPDCCH, wherein the number of ECCEs forming each of the one or more EPDCCH candidates corresponds to an aggregation level, the number of the EPDCCH candidates is set based on the number of ECCEs for each resource block and the number of resource blocks, and, when the number of resource blocks is a first value and the number of ECCEs for each resource block is a second value, the number of EPDCCH candidates in a specific aggregation level is set as a value obtained by dividing the total number of ECCEs by the specific aggregation level.

Claims

1. A method for receiving an EPDCCH (Enhanced Physical Downlink Control Channel) from a base station by a user equipment (UE) in a wireless communication system, the method comprising:

monitoring at least one EPDCCH candidate comprising one or more enhanced control channel elements (ECCEs) in resource blocks for the EPDCCH and receiving the EPDCCH,

wherein a number of ECCEs forming each of the at least one EPDCCH candidate corresponds to an aggregation level,

wherein a number of the at least one EPDCCH candidate is defined based on a number of ECCEs per resource block and a number of the resource blocks,

wherein, when the number of the resource blocks is a first value and the number of ECCEs per resource block is a second value, the number of the at least one EPDCCH candidate at a specific aggregation level is defined as a value obtained by dividing a total number of ECCEs by the specific aggregation level.

2. The method according to claim 1, wherein the total number of ECCEs is represented by a product of the first value and the second value.

3. The method according to claim 1, wherein

the first value is 2 and the second value is 4.

4. The method according to claim 1, wherein the aggregation level is one of 1, 2, 4 and 8.

5. The method according to claim 1, wherein, when the number of resource blocks is not the first value or the number of ECCEs per resource block is not the second value, the number of the at least one EPDCCH candidate at the specific aggregation level is set to a predefined value.

6. The method according to claim 1, wherein the number of ECCEs per resource block is 2 or 4.

7. A UE in a wireless communication system, comprising:

a processor configured to obtain an EPDCCH by monitoring at least one EPDCCH candidate composed of one or more enhanced control channel elements (ECCEs) in resource blocks for the EPDCCH,

wherein a number of ECCEs forming each of the at least one EPDCCH candidate corresponds to an aggregation level,

wherein the processor is configured to set the number of the at least one EPDCCH candidate on the basis of a number of ECCEs per resource block and a number of the resource blocks, the processor being configured to set the number of the at least one EPDCCH candidate at a specific aggregation level as a value obtained by dividing a total number of ECCEs by the specific aggregation level when the number of the resource blocks is a first value and the number of ECCEs per resource block is a second value.

8. The UE according to claim 7, wherein the total number of ECCEs is represented as a product of the first value and the second value.

9. The UE according to claim 7, wherein the first value is 2 and the second value is 4.

10. The UE according to claim 7, wherein the aggregation level is one of 1, 2, 4 and 8.

11. The UE according to claim 7, wherein the processor sets the number of the EPDCCH candidates at the specific aggregation level to a predefined value when the number of resource blocks is not the first value or the number of ECCEs per resource block is not the second value.

12. The UE according to claim 7, wherein the number of ECCEs per resource block is 2 or 4.

13. A method for receiving an EPDCCH from a base station by a UE in a wireless communication system, the method comprising:

monitoring at least one EPDCCH candidate comprising one or more ECCEs in resource blocks for the EPDCCH and receiving the EPDCCH,

wherein a number of ECCEs forming each of the at least one EPDCCH candidate corresponds to an aggregation level,

wherein a number of the at least one EPDCCH candidate is set on the basis of a number of ECCEs per resource block and a number of the resource blocks,

wherein, when a total number of ECCEs included in the resource blocks is insufficient to generate a predetermined number of EPDCCH candidates for a specific aggregation level, a number of EPDCCH candidates for an aggregation level lower than the specific aggregation level is increased and the number of EPDCCH candidates for the specific aggregation level is reduced.