Method for setting search space for relay node in wireless communication system and device therefor

• US 9,591,664 B2
• Filed: 02/01/2012
• Issued: 03/07/2017
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hakseong, Seo, Hanbyul, Kim, Byounghoon, Kim, Kijun
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): Wood, Jonathan B
• Application Number:
  US13/979,342
• Publication Number:
  US 20130294332A1
• Time in Patent Office: 1,861 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

Disclosed in the present invention is a method for a relay node to receive a control signal from a base station in a wireless communication system. More particularly, the present invention comprises the steps of: receiving a downlink signal from the base station; and obtaining control information for the relay node by blind-decoding the downlink signal, wherein a search space for blind decoding is located in the data region of a subframe, and is divided into a search space for a downlink grant and a search space for an uplink grant. When the subframe corresponding to the control information for the relay node is a downlink (DL) standalone, the search area including only the search space for the downlink grant, or the search area for the uplink grant being set as an invalid search space would be desirable.

Claims

1. A method for obtaining control information by a relay node in a wireless communication system, the method comprising:

receiving, by the relay node, search space configuration information for configuring a first search space for a downlink grant and configuring a second search space for an uplink grant in a data region of a subframe via a higher layer signaling;

receiving, by the relay node, downlink standalone subframe information indicating which subframe is a downlink standalone subframe; and

obtaining, by the relay node, the control information for the relay node by;

performing blind decoding on the first search space other than the second search space, when the downlink standalone subframe information indicates that the subframe is the downlink standalone subframe, and

performing blind decoding on both the first search space and the second search space, when the downlink standalone subframe information indicates that the subframe is not the downlink standalone subframe,

wherein the second search space is configured as an invalid search space and a data channel is mapped to the invalid search space when the downlink standalone subframe information indicates that the subframe is the downlink standalone subframe.

2. The method of claim 1, wherein the first search space is located in a first slot of the subframe, and

wherein the second search space is located in a second slot of the subframe.

3. A relay node in a wireless communication system, the relay node comprising:

a radio frequency (RF) module; and

a processor configured to;

control the RF module to receive search space configuration information for configuring a first search space for a downlink grant and configuring a second search space for an uplink grant in a data region of a subframe via a higher layer signaling

control the RF module to receive downlink standalone subframe information indicating which subframe is a downlink standalone subframe, and

obtain control information for the relay node by;

performing blind decoding on the first search space other than the second search space, when the downlink standalone subframe information indicates that the subframe is the downlink standalone subframe, and

performing blind decoding on both the first search space and the second search space , when the downlink standalone subframe information indicates that the subframe is not the downlink standalone subframe,

wherein the processor configures the second search space as an invalid search space and receives a data channel in the invalid search space when the downlink standalone subframe information indicates that the subframe is the downlink standalone subframe.

4. The relay node of claim 3, wherein the first search space is located in a first slot of the subframe, and

wherein the second search space is located in a second slot of the subframe.