Control channel monitoring method and device

• US 9,246,652 B2
• Filed: 07/02/2012
• Issued: 01/26/2016
• Est. Priority Date: 07/03/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahn, Joon Kui, Yang, Suck Chel, Kim, Min Gyu, Seo, Dong Youn
• Primary Examiner(s): Pham, Chi H
• Assistant Examiner(s): Lopata, Robert
• Application Number:
  US14/130,660
• Publication Number:
  US 20140133590A1
• Time in Patent Office: 1,303 Days
• Field of Search: 370/241, 370/252
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 72/00 Local resource management

Abstract

The present invention relates to a method and device for monitoring a control channel in a wireless communication system. A terminal receives a UE-specific reference signal (URS) from at least one extended subframe, and monitors a control channel in an extended control channel region of the at least one extended subframe. The control channel is demodulated using the URS.

Claims

1. A method for monitoring a control region in a wireless communication system, the method comprising:

receiving, by a user equipment (UE), configuration information indicating at least one sub-frame among the plurality of sub-frames, wherein the at least one sub-frame includes an extended control region, and wherein the extended control region is included in a data region which exists in a whole orthogonal frequency division multiplexing (OFDM) symbol of the at least one sub-frame;

if the at least one sub-frame is a special sub-frame, receiving, by the UE, a cell-specific reference signal (CRS) in a downlink pilot time slot (DwPTS) of the special sub-frame, or if the at least one sub-frame is not the special sub-frame, receiving, by the UE, a UE-specific reference signal (URS) in the extended control region, wherein the CRS is used to estimate the extended control region by a whole UE in a cell, and wherein the URS is used to estimate the extended control region by a specific UE in the cell; and

if the at least one sub-frame is the special sub-frame, monitoring, by the UE, the extended control region using the CRS, or if the at least one sub-frame is not the special sub-frame, monitoring, by the UE in a first OFDM symbol of the at least one sub-frame, the extended control region using the URS.

2. The method of claim 1, wherein the at least one sub-frame includes a plurality of OFDM symbols.

3. The method of claim 1, wherein a pseudo-random sequence used for generating the URS is initialized based on an identifier of the UE.

4. The method of claim 1, further comprising:

receiving indication information indicating whether there is the extended control region in the first OFDM symbol.

5. The method of claim 1, wherein the at least one sub-frame is repeated at the period of sub-frames whose number is a multiple of eight.

6. The method of claim 1, wherein the at least one sub-frame is repeated at the period of sub-frames whose number is a multiple of ten.

7. The method of claim 1, wherein the configuration information is received through an RRC (Radio Resource Control) message or an MAC (Medium Access Control) message.

8. A user equipment (UE) for monitoring a control region in a wireless communication system, the UE comprising:

an RF (radio frequency) unit transmitting and receiving a radio signal; and

a processor connected with the RF unit, wherein the processor is configured to;

receive configuration information indicating at least one sub-frame of the plurality of sub-frames, wherein the at least one sub-frame includes an extended control region, and wherein the extended control region is included in a data region which exists in a whole orthogonal frequency division multiplexing (OFDM) symbol of the at least one sub-frame,

if the at least one sub-frame is a special sub-frame, receive, by the UE, a cell-specific reference signal (CRS) in a downlink pilot time slot (DwPTS) of the special sub-frame, or if the at least one sub-frame is not the special sub-frame, receive, by the UE, a UE-specific reference signal (URS) in the extended control region, wherein the CRS is used to estimate the extended control region by a whole UE in a cell, and wherein the URS is used to estimate the extended control region by a specific UE in the cell, and

if the at least one sub-frame is the special sub-frame, monitor, by the UE, the extended control region using the CRS, or if the at least one sub-frame is not the special sub-frame, monitor, by the UE in a first OFDM symbol of the at least one sub-frame, the extended control region using the URS.

9. The UE of claim 8, wherein the at least one sub-frame includes a plurality of OFDM symbols.

10. The UE of claim 8, wherein a pseudo-random sequence used for generating the URS is initialized based on an identifier of the UE.

11. The UE of claim 8, wherein the processor is further configured to:

receive indication information indicating whether there is the extended control region in the first OFDM symbol.