METHOD AND APPARATUS FOR RECEIVING DOWNLINK SIGNALS

• US 20130114539A1
• Filed: 05/11/2011
• Published: 05/09/2013
• Est. Priority Date: 05/11/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hakseong, Seo, Hanbyul, Kim, Kijun, Kim, Byounghoon, Lee, Daewon
• Granted Patent: US 8,908,628 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/0091 arrangements specific to receivers, e.g. format detection detection of data rate H04L25/0262; detection of coding rate H04L1/0046
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• 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 and apparatus for receiving downlink signals in a wireless communication system. More specifically, the present invention relates to a method for receiving downlink signals in a wireless communication and an apparatus incorporating the same, wherein the method comprises the steps of: receiving a sub frame having two slots; blind decoding a plurality of R-PDCCH (Relay Physical Downlink Control Channel) candidates in order to receive control data from the search space of a first slot; and determining whether the R-PDCCH conveys control data for downlink transmission or uplink transmission when R-PDCCH was detected in the search space, wherein the control data for the downlink transmission and uplink transmission have an equal size of data.

Claims

1. A method for receiving a downlink signal in a wireless communication system, the method comprising:

receiving a subframe including two slots;

performing blind decoding (BD) of a plurality of Relay Physical Downlink Control Channel (R-PDCCH) candidates so as to receive control information in a search space of a first slot; and

if the R-PDCCH is detected in the search space, determining whether the R-PDCCH carries either control information for downlink transmission or control information of uplink transmission,

wherein the control information for downlink transmission has the same size as the control information for uplink transmission.

2. The method according to claim 1, wherein the control information for downlink transmission and the control information for uplink transmission are distinguished from each other by indication information contained in downlink control information (DCI).

3. The method according to claim 1, wherein the control information for downlink transmission and the control information for uplink transmission are distinguished from each other by a Radio Network Temporary Identifier (RNTI) masked to a Cyclic Redundancy Check (CRC) of downlink control information (DCI).

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

if the control information for uplink transmission is not detected in the first slot, performing blind decoding (BD) of a plurality of R-PDCCH candidates so as to receive the control information for uplink transmission in a search space of a second slot.

5. A communication device configured to receive downlink signals in a wireless communication system comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor receives a subframe including two slots;

performs blind decoding (BD) of a plurality of Relay Physical Downlink Control Channel (R-PDCCH) candidates so as to receive control information in a search space of a first slot; and

if the R-PDCCH is detected in the search space, determining whether the R-PDCCH carries either control information for downlink transmission or control information of uplink transmission, wherein the control information for downlink transmission has the same size as the control information for uplink transmission.

6. The communication device according to claim 5, wherein the control information for downlink transmission and the control information for uplink transmission are distinguished from each other by indication information contained in downlink control information (DCI).

7. The communication device according to claim 5, wherein the control information for downlink transmission and the control information for uplink transmission are distinguished from each other by a Radio Network Temporary Identifier (RNTI) masked to a Cyclic Redundancy Check (CRC) of downlink control information (DCI).

8. The communication device according to claim 5, wherein, if the control information for uplink transmission is not detected in the first slot, the processor performs blind decoding (BD) of a plurality of R-PDCCH candidates so as to receive the control information for uplink transmission in a search space of a second slot.