Method for transmitting/receiving a CoMP reference signal

Patent metadata

Field	Value
Publication number	US-9379865-B2
Application number	US-201514659018-A
Country	US
Kind code	B2
Filing date	Mar 16, 2015
Priority date	Jul 24, 2009
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A method of generating reference signals by a base station in a wireless communication system is disclosed. The method including a sequence of a first reference signal using a cell identifier of the base station, transmitting, to a first user equipment (UE), a message including mode information indicating a first mode for a coordinated multi-point (CoMP) operation and a predetermined identifier being different from the cell identifier of the base station and generating a sequence of a second reference signal for the first UE using the predetermined identifier instead of the cell identifier of the base station.

First claim

What is claimed:

1. A method of generating reference signals by a base station in a wireless communication system, the method comprising:
generating a sequence of a first reference signal using a cell identifier of the base station;
transmitting, to a first user equipment (UE), a message including mode information indicating a first mode for a coordinated multi-point (CoMP) operation and a predetermined identifier being different from the cell identifier of the base station; and
generating a sequence of a second reference signal for the first UE using the predetermined identifier instead of the cell identifier of the base station.

2. The method of claim 1 , wherein the message is transmitted via radio resource reconfiguration (RRC) signaling.

3. The method of claim 1 , wherein the first reference signal is a cell-specific reference signal and the second reference signal is a UE-specific reference signal.

4. The method of claim 1 , further comprising:
transmitting, to the first UE, the sequence of the second reference signal and a downlink control information (DCI) including a field indicating an index of the predetermined identifier.

5. The method of claim 1 , further comprising:
broadcasting the cell identifier via a primary-synchronization signal (PSS) and a secondary-synchronization signal (SSS).

6. The method of claim 1 , further comprising:
generating a sequence of a third reference signal for a second UE in a second mode for a non-CoMP operation using the cell identifier of the base station.

7. The method of claim 1 , further comprising:
mapping the sequence of the second reference signal on resource elements without cell identifier based cell-specific frequency shifting (V shift ).

8. The method of claim 1 , further comprising:
applying an orthogonal code to the sequence of the second reference signal.

9. A method of receiving reference signals by a first user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, a sequence of a first reference signal using a cell identifier of the base station;
receiving, from the base station, a message including mode information indicating a first mode for a coordinated multi-point (CoMP) operation and a predetermined identifier being different from the cell identifier of the base station; and
receiving, from the base station, a sequence of a second reference signal for the first UE using the predetermined identifier instead of the cell identifier of the base station.

10. The method of claim 9 , wherein the message is received via radio resource reconfiguration (RRC) signaling.

11. The method of claim 9 , wherein the first reference signal is a cell-specific reference signal and the second reference signal is a UE-specific reference signal.

12. The method of claim 9 , further comprising:
receiving a downlink control information (DCI) including a field indicating an index of the predetermined identifier.

13. The method of claim 9 , further comprising:
obtaining the cell identifier via a primary-synchronization signal (PSS) and a secondary-synchronization signal (SSS).

14. The method of claim 9 , wherein the sequence of the second reference signal is mapped on resource elements without cell identifier based cell-specific frequency shifting (V shift ).

15. The method of claim 9 , wherein an orthogonal code is applied to the sequence of the second reference signal.

16. A base station comprising:
a processor configured to generate a sequence of a first reference signal using a cell identifier of the base station; and
a transmitter configured to transmit, to a first user equipment (UE), a message including mode information indicating a first mode for a coordinated multi-point (CoMP) operation and a predetermined identifier being different from the cell identifier of the base station,
wherein the processor generates a sequence of a second reference signal for the first UE using the predetermined identifier instead of the cell identifier of the base station.

17. A user equipment (UE) comprising:
a receiver;
a processor controlling the receiver to receive, from a base station, a sequence of a first reference signal using a cell identifier of the base station, to receive, from the base station, a message including mode information indicating a first mode for a coordinated multi-point (CoMP) operation and a predetermined identifier being different from the cell identifier of the base station and to receive, from the base station, a sequence of a second reference signal for the UE using the predetermined identifier instead of the cell identifier of the base station.

Assignees

• Lg Electronics Inc
• Dentons Us Llp

Inventors

• Koo Ja Ho
• Han Seung Hee
• Ko Hyun Soo
• Chung Jae Hoon
• Ihm Bin Chul
• Lee Moon Il

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04J11/0069

  Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655) · CPC title

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04J11/005

  of intercell interference · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title