Method for receiving down link signal and apparatus therefor

Patent metadata

Field	Value
Publication number	US-2016006549-A1
Application number	US-201414772031-A
Country	US
Kind code	A1
Filing date	Mar 18, 2014
Priority date	Mar 25, 2013
Publication date	Jan 7, 2016
Grant date	—

Abstract

A method for receiving downlink signal and an apparatus therefor are disclosed. A method for enabling a user equipment (UE) to receive a downlink signal from an eNB including a plurality of antenna ports in a wireless communication system includes: receiving a precoded reference signal according to a precoded reference signal configuration for the plurality of antenna ports; measuring receive (Rx) power of the reference signal for each of the plurality of antenna ports; and reporting, to the eNB, at least one of Rx power values of the reference signal, measured for the plurality of antenna ports. The reference signal is for serving cell search of the UE and precoding is applied to the plurality of antenna ports through which the reference signal is transmitted.

First claim

1 . A method for receiving, by a user equipment (UE), downlink signal from an eNB having a plurality of antenna ports in a wireless communication system, the method comprising:
receiving reference signal according to a precoded reference signal configuration composing the plurality of antenna ports; measuring received power value of the reference signal for each of the plurality of antenna ports; and reporting, to the eNB, at least one of measured received power values for the plurality of antenna ports, wherein the reference signal is for searching a serving cell of the UE and each of the reference signal which is transmitted through the plurality of antenna ports is precoded.

2 . The method according to claim 1 , wherein resources for the precoded reference signal include at least part of resources for a channel state information-reference signal (CSI-RS) configurable for the UE.

3 . The method according to claim 1 , wherein the reporting includes:
transmitting, to the eNB, a maximum value from among the measured received power values for the plurality of antenna ports, and selected received power value(s) ranging between a predetermined threshold and the maximum value.

4 . The method according to claim 1 , wherein the reporting includes:
transmitting, to the eNB, a power value of the reference signal received from a predetermined reference antenna port from among the plurality of antenna ports, and selected received power value(s) ranging between a predetermined threshold and the power value.

5 . The method according to claim 1 , wherein the reporting the at least one of measured received power values is performed for antenna groups each of which is composed of two or more antenna ports,
wherein the antenna groups are configured to have antenna group levels corresponding to the number of antenna ports belonging thereto.

6 . The method according to claim 5 , wherein two or more an the antenna groups include at least one identical antenna port.

7 . The method according to claim 5 , further comprising transmitting, to the eNB, information about an antenna group having the highest received power value of the reference signal according to the antenna group levels.

8 . The method according to claim 5 , further comprising transmitting, to the eNB, information about an antenna group having the highest received power value of the reference signal from among antenna groups of all antenna group levels.

9 . The method according to claim 8 , further comprising applying an offset designated for each of the antenna group levels to received power of the reference signal when comparing received power values for antenna groups belonging to different antenna group levels to derive the highest received power value of the reference signal.

10 . The method according to claim 1 , further comprising receiving information on determination of handover to another eNB based on the reported at least one of measured received power values.

11 . The method according to claim 1 , further comprising receiving a configuration related to a CSI-RS based on the reported at least one of measured received power values.

12 . The method according to claim 1 , further comprising receiving information on another reference signal to be used to detect the reference signal.

13 . The method according to claim 1 , wherein the plurality of antenna ports is two-dimensionally arranged.

14 . A UE configured to receive downlink signal from an eNB having a plurality of antenna ports in a wireless communication system, the UE comprising:
a radio frequency (RF) unit; and a processor configured to control the RF unit, wherein the processor is configured to receive reference signal according to a precoded reference signal configuration composing the plurality of antenna ports, to measure received power value of the reference signal for each of the plurality of antenna ports and to report, to the eNB, at least one of measured received power values for the plurality of antenna ports, wherein the reference signal is for searching a serving cell of the UE and each of the reference signal which is transmitted through the plurality of antenna ports is precoded.

15 . A method for transmitting, by an eNB having a plurality of antenna ports, downlink signal to a UE in a wireless communication system, the method comprising:
transmitting reference signal according to a precoded reference signal configuration composing the plurality of antenna ports; and receiving, from the UE, at least one of received power values of the reference signal measured by the UE for the plurality of antenna ports, wherein the reference signal is for searching a serving cell of the UE and each of the reference signal which is transmitted through the plurality of antenna ports is precoded.

Assignees

• Lg Electronics Inc

Inventors

• Kim Kijun
• Kim Youngtae
• Park Jonghyun

Classifications

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04B7/0617

  for beam forming · CPC title

• 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

• H04L1/206

  for modulated signals · CPC title

• H04B7/0413

  MIMO systems · CPC title