METHOD FOR TRANSMITTING AND RECEIVING UPLINK REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM HAVING MULTIPLE ANTENNAS

• US 20110228737A1
• Filed: 12/09/2009
• Published: 09/22/2011
• Est. Priority Date: 12/09/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Ki Jun, Yun, Young Woo, Kim, Bonghoe, Noh, Yujin, Lee, Daewon
• Granted Patent: US 8,619,692 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0671 using different delays between antennas

Abstract

A method for transmitting and receiving uplink reference signals in a wireless communication system having multiple antennas is disclosed. The uplink reference signal transmission method includes transmitting a first reference signal sequence to a base station, and transmitting a second reference signal sequence to the base station, the second reference signal sequence being obtained by cyclically shifting the first reference signal sequence by a first cyclic delay value.

Claims

1. A method for transmitting uplink reference signals through multiple antennas in a user equipment in a wireless communication system, the method comprising:

transmitting a first reference signal sequence to a base station; and

transmitting a second reference signal sequence to the base station, the second reference signal sequence being obtained by cyclically shifting the first reference signal sequence by a first cyclic delay value.

2. The method according to claim 1, wherein the first cyclic delay value is a predetermined value known to the user equipment.

3. The method according to claim 2, wherein the first cyclic delay value is determined according to a cyclic prefix length used in the wireless communication system.

4. The method according to claim 3, wherein the first cyclic delay value is calculated by multiplying a symbol duration by a minimum of p/12 values larger than a value resulting from dividing the cyclic prefix length by the symbol duration, p being integers equal to or larger than 0 and less than 12.

5. The method according to claim 3, wherein the first reference signal sequence is generated by cyclically shifting a sequence preliminarily agreed on between the base station and the user equipment by a second cyclic shift value.

6. The method according to claim 5, wherein the second cyclic delay value is acquired from control information received from the base station.

7. The method according to claim 6, wherein the wireless communication system has a plurality of predetermined cyclic delay values and the first cyclic delay value is calculated by subtracting the second cyclic delay value from a minimum of values larger than a sum of the cyclic prefix length and the second cyclic shift value, among the plurality of predetermined cyclic delay values.

8. The method according to claim 1, wherein the first cyclic delay value is received from the base station.

9. The method according to claim 1, further comprising, if the wireless communication system has a rank of 3 or higher, transmitting (the rank−

2) reference signal sequences generated sequentially by cyclically shifting the second reference signal sequence by multiples of the first cyclic delay value.

10. A method for receiving uplink reference signals transmitted through multiple antennas in a wireless communication system, the method comprising:

transmitting a control signal including indication information indicating a first cyclic delay value to a user equipment; and

receiving a plurality of reference signal sequences including a first reference signal sequence generated based on the first cyclic delay value and a second reference signal sequence generated by cyclically shifting the first reference signal sequence by a second cyclic delay value.

11. The method according to claim 10, wherein the second cyclic delay value is a predetermined value known to the user equipment.

12. The method according to claim 11, wherein the second cyclic delay value is determined according to a cyclic prefix length used in the wireless communication system.

13. The method according to claim 12, wherein the wireless communication system has a plurality of predetermined cyclic delay values and the second cyclic delay value is calculated by subtracting the second cyclic delay value from a minimum of values larger than a sum of the cyclic prefix length and the first cyclic shift value, among the plurality of predetermined cyclic delay values.

14. The method according to claim 13, further comprising:

receiving a plurality of transmission blocks from the user equipment;

transmitting response information for a first transmission block among the plurality of transmission blocks in physical resources determined according to a transmission frequency of the plurality of transmission blocks and the first cyclic delay value; and

transmitting response information for a second transmission block among the plurality of transmission blocks in physical resources determined according to the transmission frequency of the plurality of transmission blocks and a sum of the first and second cyclic delay values.

15. The method according to claim 10, wherein the second cyclic delay value is transmitted by the base station.

16. The method according to claim 10, wherein if the wireless communication system has a rank of 3 or higher, the plurality of reference signal sequences further include (the rank−

2) reference signal sequences generated sequentially by cyclically shifting the second reference signal sequence by multiples of the second cyclic delay value.