APPARATUS AND METHOD FOR TRANSMITTING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM

• US 20120039298A1
• Filed: 04/22/2010
• Published: 02/16/2012
• Est. Priority Date: 04/22/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Moon Il, Koo, Ja Ho, Chung, Jae Hoon, Ihm, Bin Chul, Ko, Hyun Soo
• Granted Patent: US 9,106,395 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0465 taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
• CPC Class Codes: H04B 7/066 Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
• CPC Class Codes: H04L 1/0079 Formats for control data H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal

Abstract

A method of transmitting a reference signal by a base station in a wireless communication system is provided. The method includes: generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle.

Claims

1. A method of transmitting a reference signal by a base station in a wireless communication system, the method comprising:

generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and

transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle.

2. The method of claim 1, wherein each of the plurality of reference signals for channel measurement is a reference signal for channel measurement for a different number of transmit antennas.

3. The method of claim 1, wherein the plurality of reference signals for channel measurement include a reference signal for channel measurement for a virtual antenna and a reference signal for channel measurement for a physical antenna.

4. The method of claim 1, wherein each of the plurality of reference signals for channel measurement is transmitted with a different duty cycle.

5. The method of claim 1, wherein if the plurality of reference signals for channel measurement include a first reference signal for channel measurement and a second reference signal for channel measurement, the second reference signal for channel measurement is transmitted by being shifted by an offset value from a point at which the first reference signal for channel measurement is transmitted.

6. The method of claim 1, wherein if the plurality of reference signals for channel measurement include a first reference signal for channel measurement and a second reference signal for channel measurement, the first reference signal for channel measurement is transmitted periodically, and the second reference signal for channel measurement is transmitted non-periodically.

7. The method of claim 1, further comprising transmitting a reference signal for demodulation, wherein the reference signal for demodulation is transmitted in every subframe.

8. The method of claim 1, wherein the plurality of reference signals for channel measurement have the same reference signal pattern, and the reference signal pattern is a time-frequency resource pattern used in reference signal sequence transmission.

9. The method of claim 1, wherein each of the plurality of reference signals for channel measurement has a different reference signal pattern.

10. The method of claim 9, wherein if the plurality of reference signals for channel measurement include a first reference signal for channel measurement and a second reference signal for channel measurement, a reference signal pattern of the second reference signal for channel measurement has a format in which a reference signal pattern of the first reference signal for channel measurement is shifted along a time axis or a frequency axis.

11. The method of claim 1, wherein if the base station transmits the reference signal for channel measurement by using multiple carriers, types of the plurality of reference signals for channel measurement are determined for the respective carriers.

12. The method of claim 1, wherein if the plurality of reference signals for channel measurement include a first reference signal for channel measurement and a second reference signal for channel measurement, the first reference signal for channel measurement and the second reference signal for channel measurement are determined according to a multi-antenna transmission scheme.

13. The method of claim 1, wherein if the plurality of reference signals for channel measurement include a first reference signal for channel measurement and a second reference signal for channel measurement, the first reference signal for channel measurement and the second reference signal for channel measurement are determined according to a type of a user equipment.

14. The method of claim 13, wherein the user equipment receives and uses any one of the first reference signal for channel measurement and the second reference signal for channel measurement according to a time.

15. An apparatus for transmitting a reference signal, the apparatus comprising:

N antennas; and

a processor coupled to the N antennas and configured for;

generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and

transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle.