Method for performing measurement in wireless communication system and apparatus for same

• US 10,721,640 B2
• Filed: 08/07/2015
• Issued: 07/21/2020
• Est. Priority Date: 08/08/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Jonghyun, Yi, Yunjung, You, Hyangsun
• Primary Examiner(s): Scheibel, Robert C
• Application Number:
  US15/329,218
• Publication Number:
  US 20170215097A1
• Time in Patent Office: 1,810 Days
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 7/00 Radio transmission systems, i.e. using radiation field H04B10/00, H04B15/00 take precedence
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method for performing a measurement in a wireless communication system and an apparatus for the same are disclosed. Particularly, a method by which a terminal performs a measurement in a wireless communication system comprises the steps of: receiving, by the terminal, a discovery signal; and measuring, by the terminal, reference signal received power (RSRP) and/or reference signal received quality (RSRQ) on the basis of the discovery signal, wherein the number of antenna ports of a cell-specific reference signal (CRS) cannot be applied to the discovery signal-based measurement.

Claims

1. A method of performing a measurement in a wireless communication system, the method performed by a user equipment (UE) and comprising:

receiving, from a base station (BS), a cell-specific reference signal (CRS) configuration including information related to whether or not two antenna ports are used for a CRS;

receiving, from the BS, a discovery signal received via a number of antenna ports, the number of antenna ports used for receiving the discovery signal derived from the information included in the CRS configuration; and

measuring at least a reference signal receive power (RSRP) or a reference signal received quality (RSRQ) based on the discovery signal,

wherein, when the information included in the CRS configuration informs that the two antenna ports are used for the CRS, the discovery signal comprises a CRS for discovery on the two antenna ports.

2. The method of claim 1, further comprising:

receiving, from the BS;

a first subframe pattern for a CRS-based measurement, and

first cell information for at least one cell to which the first subframe pattern is applied; and

receiving, from the BS, a second subframe pattern for a DRS-based restricted measurement within a discovery signal measurement timing configuration (DMTC) duration and second cell information for at least one cell to which the second subframe pattern is applied.

3. The method of claim 2, wherein the measurement is performed in a subframe indicated by the received first subframe pattern within the DMTC duration for monitoring the discovery signal.

4. The method of claim 3, wherein the measurement is performed in a subframe indicated by the second subframe pattern.

5. The method of claim 3, wherein only a restricted measurement based on the received discovery signal or a restricted measurement based on the CRS is performed for an overlapped cell when a cell belonging to the received first cell information and a cell belonging to the received second cell information are overlapped.

6. The method of claim 3, wherein the CRS-based restricted measurement is performed for an overlapped cell in a subframe indicated by the received first subframe pattern when a cell belonging to the received first cell information and a cell belonging to the received second cell information are overlapped.

7. The method of claim 3, wherein a restricted measurement based on the received discovery signal is performed for an overlapped cell in a subframe indicated by the received second subframe pattern and the CRS-based restricted measurement is performed in a subframe indicated by the received first subframe pattern in a duration other than the DMTC duration when a cell belonging to the received first cell information and a cell belonging to the received second cell information are overlapped.

8. The method of claim 1, wherein the measurement is performed assuming that the two antenna ports are used for the discovery signal when the CRS configuration indicates that two antenna ports are used for the CRS.

9. The method of claim 1, wherein the measurement is performed assuming that only one of the two antenna ports is used for the discovery signal when the CRS configuration indicates that one antenna port is used for the CRS.

10. The method of claim 1, wherein a Radio Resource Control (RRC) parameter PresenceAntennaPort1 is used for the received CRS configuration.

11. A user equipment (UE) for performing measurement in a wireless communication system, the UE comprising:

a radio frequency (RF) unit configured to transmit and receive a wireless signal; and

a processor configured to;

control the RF unit to receive, from a base station (BS), a cell-specific reference signal (CRS) configuration including information related to whether two antenna ports are used for a CRS;

control the RF unit to receive the discovery signal from the BS via a number of antenna ports, the number of antenna ports used for receiving the discovery signal derived from the information included in the CRS configuration; and

measure at least a reference signal receive power (RSRP) or a reference signal received quality (RSRQ) based on the discovery signal,

wherein, when the information included in the CRS configuration informs that the two antenna ports are used for the CRS, the discovery signal comprises a CRS for discovery on the two antenna ports.

12. The UE of claim 11, wherein the measurement is performed assuming that the two antenna ports are used for the discovery signal when the CRS configuration indicates that two antenna ports are used for the CRS.

13. The UE of claim 11, wherein the measurement is performed assuming that only one of the two antenna ports is used for the discovery signal when the CRS configuration indicates that one antenna port is used for the CRS.

14. The UE of claim 11, wherein a Radio Resource Control (RRC) parameter PresenceAntennaPort1 is used for the received CRS configuration.