Method and apparatus for performing measurement in wireless communication system

• US 9,661,516 B2
• Filed: 03/18/2013
• Issued: 05/23/2017
• Est. Priority Date: 03/18/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Eunsun, Yoon, Sukhyon, Seo, Hanbyul, Kim, Byounghoon, Kim, Kijun
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Belur, Deepa
• Application Number:
  US14/383,457
• Publication Number:
  US 20150043369A1
• Time in Patent Office: 1,527 Days
• Field of Search: None
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

A method and apparatus for performing measurement are disclosed. The method for performing radio link monitoring by a user equipment (UE) in a wireless communication system includes: performing cancellation of a reference signal (RS) of a neighbor cell; and determining whether to declare a radio link failure (RLF) on the basis of a reference signal (RS) of a serving cell by using information of a predetermined power ratio related to the neighbor cell.

Claims

1. A method for performing radio link monitoring by a user equipment (UE) in a wireless communication system, the method comprising:

receiving predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a physical downlink control channel (PDCCH) of the neighbor cell to a transmission power of a cell-specific reference signal (CRS) of the neighbor cell;

measuring a CRS of the serving cell;

performing cancellation of the CRS of the neighbor cell from the CRS of the serving cell;

calculating a signal-to-interference plus noise ratio (SINR) of the serving cell using the predetermined power ratio information and the CRS of the serving cell; and

determining whether to declare a radio link failure (RLF) for the serving cell based on the SINR of the serving cell.

2. The method according to claim 1, wherein the predetermined power ratio information is transmitted to the UE through higher layer signaling.

3. The method according to claim 1, wherein the neighbor cell is a cell used as an interference source when the UE receives the CRS of the serving cell.

4. A method for receiving system information by a user equipment (UE) in a wireless communication system, the method comprising:

receiving predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a physical downlink control channel (PDCCH) of the neighbor cell to a transmission power of a cell-specific reference signal (CRS) of the neighbor cell;

performing cancellation of a physical broadcast channel (PBCH) signal of the neighbor cell;

performing a channel estimation of the serving cell based on the cancellation and the predetermined power ratio information; and

receiving system information through a PBCH of the serving cell based on the channel estimation.

5. The method according to claim 4, wherein the serving cell and the neighbor cell are identical in terms of at least one of a radio frame and a subframe boundary.

6. The method according to claim 4, wherein the predetermined power ratio information is transmitted to the UE through higher layer signaling.

7. The method according to claim 4, wherein the neighbor cell is a cell used as an interference source when the UE receives a CRS of the serving cell.

8. A user equipment (UE) apparatus for use in a wireless communication system, the UE apparatus comprising:

a receiver; and

a processor configured to;

control the receiver to receive a predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a physical downlink control channel (PDCCH) of the neighbor cell to a transmission power of a cell-specific reference signal (CRS) of the neighbor cell,

measure a CRS of the serving cell,

perform cancellation of the CRS of the neighbor cell from the CRS of the serving cell,

calculate a signal-to-interference plus noise ratio (SINR) of the serving cell using the predetermined power ratio information and the CRS of the serving cell, and

determine whether to declare a radio link failure (RLF) for the serving cell of the UE based on based on the SINR of the serving cell.

9. A user equipment (UE) apparatus for use in a wireless communication system, the UE apparatus comprising:

a receiver; and

a processor configured to;

control the receiver to receive a predetermined power ratio information of a neighbor cell from a serving cell, wherein the predetermined power ratio information includes a ratio of a transmission power of a cell-specific reference signal (CRS) of the neighbor cell;

perform cancellation of a physical broadcast channel (PBCH) signal of the neighbor cell,

perform a channel estimation of the serving cell based on the cancellation and the predetermined power ratio information, and

receive system information through a PBCH of the serving cell based on the channel estimation.