Method for setting search region to detect downlink control channel in wireless communication system and apparatus for same

Patent metadata

Field	Value
Publication number	US-9432985-B2
Application number	US-201314374461-A
Country	US
Kind code	B2
Filing date	Feb 28, 2013
Priority date	Mar 1, 2012
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

In the present application, disclosed a method for a terminal setting a search region for a downlink channel in a wireless communication system. More specifically, the method comprises the steps of receiving from a base station information related to a starting symbol of the search region by way of upper layer signaling; setting the search region by using the information related to the starting symbol; and receiving the downlink control channel by performing blind coding on the search region, wherein the starting symbol of the search region changes according to the characteristic of a subframe which receives the downlink control channel.

First claim

What is claimed is:

1. A method of setting a search space, which is set by a user equipment (UE) to detect a downlink control channel in a wireless communication system, the method comprising:
receiving information on a starting symbol of the search space for an enhanced downlink control channel in a data region of a subframe from an epode B; and
monitoring the enhanced downlink control channel by performing blind decoding on the search space which is set using the information on the starting symbol,
wherein, when a downlink bandwidth assigned to the UE is greater than a threshold value, the starting symbol of the search space is determined as a symbol having an index #n indicated by the information on the starting symbol, and
wherein, when the downlink bandwidth is smaller than the threshold value, the starting symbol of the search space is determined as a symbol having an index #n+1.

2. The method according to claim 1 , wherein if the subframe corresponds to a multicast broadcast single frequency network (MBSFN) subframe, the starting symbol of the search space is located more toward a front end of the starting symbol of the search space compared to a case in which the subframe corresponds to a non-MBSFN subframe.

3. The method according to claim 2 , wherein if the subframe corresponds to the MBSFN subframe, the starting symbol of the search space changes according to the number of an antenna port of a cell-specific reference signal received in the subframe.

4. The method according to claim 1 , further comprising:
receiving a control format indicator channel containing information on the number of a resource block in which the search space is configured from the eNode B.

5. The method according to claim 1 , Wherein the starting symbol of the search space changes according to whether a positioning reference signal is transmitted in the subframe.

6. The method according to claim 1 , wherein the search space is configured from the starting symbol to a last symbol of the subframe.

7. The method according to claim 1 , wherein the starting symbol of the search space changes according to the number of a symbol configured for the purpose of downlink in the subframe.

8. The method according to claim 1 , wherein if the subframe is received on an extension carrier where a legacy downlink control channel is not received, the starting symbol of the search space is configured by a first symbol of the subframe.

9. The method according to claim 1 , wherein the downlink control channel is demodulated using a UE-specific reference signal.

10. The method according to claim 1 , wherein the information on the starting symbol is transmitted via physical layer signaling.

11. A user equipment in a wireless communication system, the user equipment comprising:
a receiver configured to receive information on a starting symbol of a search space for an enhanced downlink control channel in a data region of a subframe from an eNode B; and
a processor configured to monitor the enhanced downlink control channel by performing blind decoding on the search space which is set using the information on the starting symbol,
wherein, when a downlink bandwidth assigned to the user equipment is greater than a threshold value, the starting symbol of the search space is determined as a symbol having an index #n indicated by the information on the starting symbol, and
wherein, when the downlink bandwidth is smaller than the threshold value, the starting symbol of the search space is determined as a symbol having an index #n+1.

Assignees

• Lg Electronics Inc

Inventors

• Lee Seungmin
• Kim Hakseong
• Seo Hanbyul

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L27/2607

  Cyclic extensions · CPC title

• H04W4/06

  Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services · CPC title

• H04B7/2603

  Arrangements for wireless physical layer control (H04B7/2612 takes precedence) · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title