METHOD AND APPARATUS FOR RECEIVING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20160134402A1
• Filed: 10/29/2015
• Published: 05/12/2016
• Est. Priority Date: 10/29/2014
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Hanjun, LEE, Hyunho, KIM, Kijun, YOU, Hyangsun
• Application Number:
  US14/927,155
• Publication Number:
  US 20160134402A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2663 Coarse synchronisation, e.g. by correlation
• CPC Class Codes: H04L 27/2671 Time domain
• CPC Class Codes: H04L 27/2675 Pilot or known symbols
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

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.

Claims

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.