Method and apparatus for receiving reference signal in wireless communication system

Patent metadata

Field	Value
Publication number	US-2016134402-A1
Application number	US-201514927155-A
Country	US
Kind code	A1
Filing date	Oct 29, 2015
Priority date	Oct 29, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

A method for receiving a reference signal for determining a position in a wireless communication system performed by a terminal is provided. The method includes receiving, from a serving base station, cyclic delay information of a plurality of positioning reference signals (PRSs), receiving the plurality of PRSs from a plurality of base stations using the cyclic delay information, each of the plurality of PRSs being repeatedly received a predetermined number of times for a predetermined period of time, and a respective one of the repeatedly received PRSs having different cyclic delay values with an interval, calculating a cross-correlation value of each of the plurality of received PRSs, calculating a time difference of arrival (TDOA) value of each base station based on the cross-correlation value and reporting the calculated TDOA value to the serving base station.

First claim

What is claimed is:

1 . A method for receiving a reference signal for determining a position in a wireless communication system performed by a terminal, the method comprising:
receiving, from a serving base station, cyclic delay information of a plurality of positioning reference signals (PRSs); receiving the plurality of PRSs from a plurality of base stations using the cyclic delay information, each of the plurality of PRSs being repeatedly received a predetermined number of times for a predetermined period of time, and a respective one of the repeatedly received PRSs having different cyclic delay values with an interval; calculating a cross-correlation value of each of the plurality of received PRSs; and calculating a time difference of arrival (TDOA) value of each base station based on the cross-correlation value and reporting the calculated TDOA value to the serving base station.

2 . The method according to claim 1 , wherein each of the plurality of PRSs have phase values which varies by predetermined time unit.

3 . The method according to claim 2 , wherein the phase values are represented by phase sequences including complex values, and the phase sequences for the plurality of PRSs are orthogonal to each other.

4 . The method according to claim 1 , wherein the plurality of PRSs are transmitted through one antenna port of a base station.

5 . The method according to claim 1 , wherein the plurality of PRSs are transmitted through a plurality of antenna ports of a base station.

6 . The method according to claim 1 , wherein the TDOA value of each base station is acquired by performing a modulo operation on a difference value between a TOA of a reference base station and a TOA of a corresponding base station with respect to a value of the interval.

7 . The method according to claim 2 , further comprising
identifying the plurality of PRSs by comparing a phase value of the cross-correlation value with the phase values varying by the predetermined time unit.

8 . The method according to claim 1 , further comprising
reporting, to the serving base station, information about whether a maximum delay spread of a downlink channel is smaller than the interval.

9 . A terminal configured to receive a reference signal for determining a position in a wireless communication system, comprising:
a radio frequency (RF) unit; and a processor configured to control the RF unit, wherein the processor is configured to receive, from a serving base station, cyclic delay information of a plurality of PRSs, receive the plurality of PRSs from a plurality of base stations using the cyclic delay information, each of the plurality of PRSs being repeatedly received a predetermined number of times for a predetermined period of time, and a respective one of the repeatedly received PRSs having different cyclic delay values with an interval, calculate a cross-correlation value of each of the plurality of received PRSs, and calculate a a time difference of arrival (TDOA) value of each base station based on the cross-correlation value and report the calculated TDOA value to the serving base station.

10 . The terminal according to claim 9 , wherein each of the plurality of PRSs have phase values which varies by predetermined time unit.

11 . The terminal according to claim 10 , wherein the phase values are represented by phase sequences including complex values, and the phase sequences for the plurality of PRSs are orthogonal to each other.

12 . The terminal according to claim 9 , wherein the plurality of PRSs are transmitted through one antenna port of a base station.

13 . The terminal according to claim 9 , wherein the plurality of PRSs are transmitted through a plurality of antenna ports of a base station.

14 . The terminal according to claim 9 , wherein the TDOA value of each base station is acquired by performing a modulo operation on a difference value between a TOA of a reference base station and a TOA of a corresponding base station with respect to a value of the interval.

15 . The terminal according to claim 10 , wherein the processor is further configured to identify the plurality of PRSs by comparing a phase value of the cross-correlation value with the phase values varying by the predetermined time unit.

16 . The terminal according to claim 9 , wherein the processor is further configured to report, to the serving base station, information about whether a maximum delay spread of a downlink channel is smaller than the interval.

Assignees

• Lg Electronics Inc

Inventors

• Park Hanjun
• Lee Hyunho
• Kim Kijun
• You Hyangsun

Classifications

• H04W72/042

  Electricity · mapped topic

• H04L27/2607 Primary

  Cyclic extensions · CPC title

• H04L5/0053 Primary

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

• H04L27/2663 Primary

  Coarse synchronisation, e.g. by correlation · CPC title

• H04L27/2671

  Time domain · CPC title