Method for radio resource measurement in wireless access system supporting carrier aggregation, and apparatus supporting same

Patent metadata

Field	Value
Publication number	US-9936411-B2
Application number	US-201414760850-A
Country	US
Kind code	B2
Filing date	Jan 27, 2014
Priority date	Jan 25, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

The present invention relates to methods for making radio resource measurements in synchronized cells when quasi co-location is applied, and to apparatuses supporting same. A method for a terminal for making radio resource measurements (RRM) in a wireless access system according to one embodiment of the present invention may comprise the steps of: receiving an upper level signal comprising a reference signal for channel state information (CSI-RS) of a first cell, and quasi co-location (QCL) information for a cell-specific reference signal (CRS) and/or CSI-RS of a second cell; receiving the CRS and/or CSI-RS of the second cell on the basis of the QCL information; and measuring a first RRM for the first cell by means of the CRS and/or the CSI-RS of the second cell.

First claim

The invention claimed is:

1. A method for performing a Radio Resource Measurement (RRM) by a User Equipment (UE) in a radio access system, the method comprising:
receiving a higher layer signal including information about Quasi Co-Location (QCL) between a Channel State Information Reference Signal (CSI-RS) of a first cell and at least one of a Cell-specific Reference Signal (CRS) and a CSI-RS of a second cell;
receiving the at least one of the CRS and the CSI-RS of the second cell based on the information about QCL;
selecting the at least one of the CRS and the CSI-RS of the second cell indicated by the information about QCL; and
performing a first RRM for the first cell using the selected at least one of the CRS and the CSI-RS of the second cell.

2. The method according to claim 1 ,
wherein synchronization for the first cell is maintained using a synchronization signal transmitted in the second cell.

3. The method according to claim 1 , further comprising
performing a second RRM for the first cell using the CSI-RS of the first cell.

4. The method according to claim 3 ,
wherein the first RRM includes one or more of a Reference Signal Received Power (RSRP) measurement and a Path Loss (PL) measurement, and
the second RRM includes one or more of a Reference Signal Received Quality (RSRQ) and a PL measurement.

5. The method according to claim 1 ,
wherein the first cell is a synchronized cell in which a synchronization signal is not transmitted,
the second cell is a synchronization reference cell in which the synchronization signal is transmitted, and
the UE does not receive a downlink signal from the first cell while the UE receives the CRS and/or the CSI-RS from the second cell.

6. The method according to claim 1 ,
wherein the first cell is a New Carrier Type (NCT) to which one or more of a synchronization signal, a CRS, a downlink broadcast channel, and a downlink control channel are not allocated, and
the second cell is a legacy serving cell.

7. A User Equipment (UE) for performing a Radio Resource Measurement (RRM) in a radio access system, the UE comprising:
a transmitter;
a receiver; and
a processor supporting the RRM, wherein the processor:
receives a higher layer signal including information about Quasi Co-Location (QCL) between a Channel State Information Reference Signal (CSI-RS) of a first cell and at least one of a Cell-specific Reference Signal (CRS) and a CSI-RS of a second cell through the receiver;
receives the at least one of the CRS and the CSI-RS of the second cell based on the information about QCL through the receiver;
selects the at least one of the CRS and the CSI-RS of the second cell indicated by the information about QCL; and
performs a first RRM for the first cell using the selected at least one of the CRS and the CSI-RS of the second cell.

8. The UE according to claim 7 ,
wherein synchronization for the first cell is maintained using a synchronization signal transmitted in the second cell.

9. The UE according to claim 7 , wherein the processor further performs a second RRM for the first cell using the CSI-RS of the first cell.

10. The UE according to claim 9 ,
wherein the first RRM includes one or more of a Reference Signal Received Power (RSRP) measurement and a Path Loss (PL) measurement, and
the second RRM includes one or more of a Reference Signal Received Quality (RSRQ) and a PL measurement.

11. The UE according to claim 7 ,
wherein the first cell is a synchronized cell in which a synchronization signal is not transmitted,
the second cell is a synchronization reference cell in which the synchronization signal is transmitted, and
the UE does not receive a downlink signal from the first cell while the UE receives the CRS and/or the CSI-RS from the second cell.

12. The UE according to claim 7 ,
wherein the first cell is a New Carrier Type (NCT) to which one or more of a synchronization signal, a CRS, a downlink broadcast channel, and a downlink control channel are not allocated, and
the second cell is a legacy serving cell.

Assignees

• Lg Electronics Inc

Inventors

• Kim Bonghoe
• Kim Byounghoon
• Yi Yunjung
• Ahn Joonkui

Classifications

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W24/10 Primary

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L5/0053

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

• H04W56/001

  Synchronization between nodes · CPC title