METHOD OF TRANSMITTING REFERENCE SIGNALS IN A WIRELESS COMMUNICATION HAVING MULTIPLE ANTENNAS

• US 20100080154A1
• Filed: 09/25/2009
• Published: 04/01/2010
• Est. Priority Date: 09/26/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Bong Hoe, KIM, Ki Jun, LEE, Dae Won, NOH, Yu Jin
• Granted Patent: US 8,428,018 B2
• Time in Patent Office: Days
• US Class Current: 370/310
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/0248 Eigen-space methods
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided

Abstract

A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end.

Claims

1. A method of transmitting signals by a transmitting end in a wireless communication system, the method comprising:

sharing control information related to reference signal with a receiving end;

generating one or more precoded reference signals considering a given rank;

allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information to the receiving end; and

transmitting the subframe through multiple antennas.

2. The method of claim 1, wherein the control information includes information related to density or overhead of the one or more precoded reference signals.

3. The method of claim 1, wherein the control information includes information related to a frequency interval of the one or more precoded reference signals.

4. The method of claim 3, wherein the frequency interval includes subcarrier spacing between the one or more precoded reference signals within one subframe or slot, and the one or more precoded reference signals are staggered within the subframe or slot.

5. The method of claim 4, wherein the frequency interval includes subcarrier spacing between the one or more precoded reference signals within one orthogonal frequency division multiplexing (OFDM) symbol.

6. The method of claim 3, wherein the frequency interval is 1, 2, 3 or 4 when the given rank is 1.

7. The method of claim 3, wherein the frequency interval is 2, 3 or 4 when the given rank is 2.

8. The method of claim 1, wherein the control information includes information indicating the given rank.

9. The method of claim 1, wherein the control information includes information indicating whether radio resources for one or more reference signals associated with other layers which do not correspond to scheduled data stream are punctured or not.

10. The method of claim 1, wherein the control information includes information indicating whether radio resources for one or more reference signals associated with other layers which do not correspond to scheduled data stream can be used for transmitting data or not.

11. The method of claim 1, wherein the control information includes information indicating whether radio resources for one or more reference signals associated with other layers which do not correspond to scheduled data stream are used by one or more another transmitting ends.

12. The method of claim 1, wherein a specific multiple access schemes is selectively used among two or more different multiple access schemes depending on the given rank.

13. The method of claim 1, wherein the control information includes information indicating whether a radio resource for the subframe has been allocated to a single user or multiple users.

14. The method of claim 13, wherein, if the control information indicates that the radio resource for the subframe is allocated to multiple users, the one or more precoded reference signals are multiplexed within the subframe considering reference signals of other user equipments to which the same radio resource is allocated.

15. The method of claim 14, wherein the control information further includes information required to multiplex the one or more precoded reference signals with the reference signals of other user equipment.

16. The method of claim 1, wherein the one or more precoded reference signals are multiplexed using a frequency division multiplexing mode, a code division multiplexing mode, or their combination.

17. The method of claim 1, wherein the one or more precoded reference signals are cyclic-shifted in a frequency domain or a time domain.

18. The method of claim 1, wherein the subframe includes two slots, and frequency interval offset, code or their combination is applied per slot to the one or more precoded reference signals allocated to each slot.

19. The method of claim 1, wherein the one or more precoded reference signals are demodulation reference signals (DMRS).