MONITORING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM

• US 20090238091A1
• Filed: 03/19/2009
• Published: 09/24/2009
• Est. Priority Date: 03/20/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, So Yeon, CHUNG, Jae Hoon
• Granted Patent: US 7,733,827 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 27/2656 Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A method and apparatus of monitoring a physical downlink control channel (PDCCH) is disclosed. A starting location of a search space in a control region of a subframe k is acquired. The search space is defined by a set of PDCCHs at each aggregation level. The set of PDCCHs from the starting location in the search space at the each aggregation level is monitored. The starting location is defined by the multiple of the aggregation level in the control region.

Claims

1. A method of monitoring a physical downlink control channel (PDCCH) in a wireless communication system, carried in a user equipment, the method comprising:

acquiring a starting location of a search space in a control region of a subframe k, the control region comprising a set of contiguous control channel elements (CCEs) numbered from 0 to N_CCE,k−

1, where N_CCE,k is the total number of CCEs in the control region of the subframe k,

wherein the search space is defined by a set of PDCCHs at each aggregation level, the each aggregation level indicating an aggregation of contiguous CCEs,

wherein the starting location corresponding to a CCE index is defined by the multiple of the aggregation level in the control region; and

monitoring the set of PDCCHs from the starting location in the search space at the each aggregation level.

2. The method of claim 1, wherein the search space is a UE specific search space which is monitored by at least one UE in a cell.

3. The method of claim 1, wherein the set of PDCCHs are monitored in the unit of the aggregation level in the search space.

4. A user equipment comprising:

a Radio Frequency (RF) unit for transmitting and receiving radio signals; and

a processor coupled with the RF unit and configured to;

acquire a starting location of a search space in a control region of a subframe k, the control region comprising a set of contiguous control channel elements (CCEs) numbered from 0 to N_CCE,k−

1, where N_CCE,k is the total number of CCEs in the control region of the subframe k, wherein the search space is defined by a set of PDCCHs at each aggregation level, the each aggregation level indicating an aggregation of contiguous CCEs, wherein the starting location corresponding to a CCE index is defined by the multiple of the aggregation level in the control region; and

monitor the set of PDCCHs from the starting location in the search space at the each aggregation level.

5. The user equipment of claim 4, wherein the search space is a UE specific search space which is monitored by at least one UE in a cell.

6. The a user equipment of claim 4, wherein the set of PDCCHs are monitored in the unit of the aggregation level in the search space.

7. A method of monitoring a physical downlink control channel (PDCCH) in a wireless communication system, carried in a user equipment, the method comprising:

acquiring a starting location of a search space in a control region of a subframe, the control region comprising a set of contiguous control channel elements (CCEs), wherein the search space is defined by a set of PDCCHs at each aggregation level, the each aggregation level indicating an aggregation of contiguous CCEs, wherein the starting location is defined according to the aggregation level in the control region; and

monitoring the set of PDCCHs from the starting location in the search space at the each aggregation level.

8. The method of claim 7, wherein the set of contiguous CCEs in the control region is numbered from 0 to N_CCE−

1, where N_CCE is the total number of CCEs in the control region, wherein the starting location corresponding to a CCE index is defined by the multiple of the aggregation level in the control region.

9. The method of claim 7, wherein the set of contiguous CCEs in the control region is divided into

10. The method of claim 9, wherein the starting location is the first CCE in the aggregated CCE unit selected from the aggregated CCE units.

11. The method of claim 9, wherein the aggregated CCE units are numbered from 0 to

12. The method of claim 9, wherein the first CCEs in the aggregated CCE units are numbered from 0 to