METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING PDCCH USING DCI HAVING ADJUSTED SIZE

• US 20130010714A1
• Filed: 01/11/2011
• Published: 01/10/2013
• Est. Priority Date: 01/11/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, So Yeon, Moon, Sung Ho, Chung, Jae Hoon
• Granted Patent: US 9,031,016 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided

Abstract

The present invention relates to a method for adjusting a size of an information bit used in a control channel and an apparatus for performing the same. In addition, the present invention relates to a method for searching for a control channel including an information bit having an adjusted size. A method for receiving a physical downlink control channel (PDCCH) in a wireless access system for supporting multi-carriers as one embodiment of the present invention comprises the steps of: performing blind decoding in a search space allocated in a terminal to search for a PDCCH; and receiving the PDCCH including downlink control information (DCI) having a size adjusted in the search space. At this time, the size of the DCI can be adjusted by considering a bandwidth allocated in the terminal, a transmission mode of a component carrier (CC) allocated in the terminal, and the number of antennas of the terminal.

Claims

1. A method for receiving a Physical Downlink Control Channel (PDCCH) in a wireless access system that supports multiple carriers, the method comprising:

performing blind decoding in a search space allocated to a user equipment in order to search for the PDCCH; and

receiving a PDCCH including Downlink Control Information (DCI), whose size has been adjusted, in the search space,

wherein the size of the DCI has been adjusted taking into consideration at least one of a bandwidth allocated to the user equipment, a transmission mode of a Component Carrier (CC) allocated to the user equipment, and the number of antennas of the user equipment.

2. The method according to claim 1, wherein the size of the DCI has been adjusted according to the transmission mode of the CC allocated to the user equipment.

3. The method according to claim 1, wherein the size of the DCI has been adjusted according to the number of antennas of the user equipment.

4. The method according to claim 1, wherein the size of the DCI has been adjusted for DCI formats whose payload sizes slightly change according to the bandwidth.

5. The method according to claim 1, wherein sizes of DCI formats whose payload sizes greatly change according to the bandwidth have been adjusted for each bandwidth group formed through bandwidth grouping.

6. The method according to claim 1, wherein the size of the DCI has been adjusted by adjusting sizes of DCI formats other than DCI formats which are transmitted in a common search space.

7. The method according to claim 1, further comprising:

receiving at least one of information regarding the bandwidth allocated to the user equipment, information regarding the transmission mode of the CC allocated to the user equipment and information regarding the number of antennas available for the user equipment from a base station through uplink scheduling.

8. A user equipment for receiving a Physical Downlink Control Channel (PDCCH) in a wireless access system that supports multiple carriers, the user equipment comprising:

a transmission unit;

a reception unit; and

a processor,

wherein the user equipment controls the processor and the reception unit to perform blind decoding in a search space allocated to the user equipment in order to search for the PDCCH and to receive a PDCCH including Downlink Control Information (DCI), whose size has been adjusted, in the search space, and

wherein the size of the DCI has been adjusted taking into consideration at least one of a bandwidth allocated to the user equipment, a transmission mode of a Component Carrier (CC) allocated to the user equipment, and the number of antennas of the user equipment.

9. The user equipment according to claim 8, wherein the size of the DCI has been adjusted according to the transmission mode of the CC allocated to the user equipment.

10. The user equipment according to claim 8, wherein the size of the DCI has been adjusted according to the number of antennas of the user equipment.

11. The user equipment according to claim 8, wherein the size of the DCI has been adjusted for DCI formats whose payload sizes slightly change according to the bandwidth.

12. The user equipment according to claim 8, wherein sizes of DCI formats whose payload sizes greatly change according to the bandwidth have been adjusted for each bandwidth group formed through bandwidth grouping.

13. The user equipment according to claim 8, wherein the size of the DCI has been adjusted by adjusting sizes of DCI formats other than DCI formats which are transmitted in a common search space.

14. The user equipment according to claim 8, wherein the user equipment receive, using the reception unit, at least one of information regarding the bandwidth allocated to the user equipment, information regarding the transmission mode of the CC allocated to the user equipment and information regarding the number of antennas available for the user equipment from a base station through uplink scheduling.