Method for performing measurement in wireless communications system and apparatus therefor

Patent metadata

Field	Value
Publication number	US-9936405-B2
Application number	US-201414782998-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	May 7, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A method for performing measurement by a terminal in a wireless communications system according to an embodiment of the present invention includes the steps of: receiving from a first transmission point the uplink-downlink structures associated respectively with a second transmission point and a third transmission point; and determining at least one measurement set based on the received uplink-downlink structures, wherein each measurement set consists of the sub-frames that: the duplex direction combination during a particular time interval in the case of following the uplink-downlink structure associated with the second transmission point is the same as the duplex direction combination during the particular time interval in the case of following the uplink-downlink structure associated with the third transmission point.

First claim

What is claimed is:

1. A method of performing a measurement, which is performed by a user equipment in a wireless communication system, the method comprising:
receiving an uplink-downlink (UL-DL) configuration related to a 2 nd transmission point and a UL-DL configuration related to a 3 rd transmission point from a 1 st transmission point;
determining at least one or more measurement sets based on the received UL-DL configurations; and
performing the measurement on the at least one or more measurement sets,
wherein each of the at least one or more measurement sets comprises subframes with a same combination of a duplex direction in a specific time interval in accordance with the UL-DL configuration related to the 2 nd transmission point and a duplex direction in the specific time interval in accordance with the UL-DL configuration related to the 3 rd transmission point, and
wherein grouping is performed on measurement sets corresponding to a combination of specific duplex directions among the at least one or more measurement sets.

2. The method of claim 1 , wherein in the each of the at least one or more measurement sets, measurement results of subframes included in a measurement window are calculated as an average value.

3. The method of claim 2 , wherein if UL-DL configurations within the measurement window are reconfigured, the measurement results are calculated as the average value.

4. The method of claim 2 , wherein if the UL-DL configurations relate to a usage change of an uplink subframe into a downlink subframe, the average value is calculated based on measurement results of subframes unrelated to the usage change only.

5. The method of claim 1 , wherein the combination of the specific duplex directions is indicated by the 1 st transmission point.

6. The method of claim 1 , wherein the subframes included in the each of the at least one or more measurement sets are used for downlink transmission from the 1 st transmission point.

7. The method of claim 1 , wherein if the subframes included in the each of the at least one or more measurement sets are used for uplink transmission to the 1 st transmission point, uplink transmit power is independently determined in the each of the at least one or more measurement sets.

8. The method of claim 7 , wherein at least one of an uplink transmit power parameter and a transmit power control mode is determined in the each of the at least one or more measurement sets.

9. The method of claim 1 , wherein if the 2 nd transmission point corresponds to a dominant interferer, a measurement set is determined through a logical AND operation of downlink subframes in a measurement subframe set previously configured in each UL-DL configuration index of the 2 nd transmission point and a UL-DL configuration of the 1 st transmission point.

10. A user equipment for performing a measurement in a wireless communication system, the user equipment comprising:
a radio frequency (RF) module; and
a processor,
wherein the processor is configured to:
control the RF module to receive a UL-DL (uplink-downlink) configuration related to a 2 nd transmission point and a UL-DL configuration related to a 3 rd transmission point from a 1 st transmission point,
determine at least one or more measurement sets based on the received UL-DL configurations, and
perform the measurement on the at least one or more measurement sets,

wherein each of the at least one or more measurement sets comprises subframes with a same combination of a duplex direction in a specific time interval in accordance with the UL-DL configuration related to the 2 nd transmission point and a duplex direction in the specific time interval in accordance with the UL-DL configuration related to the 3 rd transmission point, and
wherein grouping is performed on measurement sets corresponding to a combination of specific duplex directions among the at least one or more measurement sets.

Assignees

• Lg Electronics Inc

Inventors

• Seo Inkwon
• Lee Seungmin
• Seo Hanbyul

Classifications

• H04B17/328

  Reference signal received power [RSRP]; Reference signal received quality [RSRQ] · CPC title

• H04W72/04 Primary

  Wireless resource allocation · CPC title

• H04B17/345

  Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title