SYSTEM FOR TRANSMITTING REFERENCE SIGNAL WITH INFORMATION ON STATE OF CHANNEL

• US 20120020272A1
• Filed: 09/19/2011
• Published: 01/26/2012
• Est. Priority Date: 03/18/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: AHN, Jae Young, LEE, Kyoung Seok, KO, Young Jo, LEE, Hee Soo, NOH, Tae Gyun
• Granted Patent: US 10,979,185 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

A reference signal (RS) transmission system to transmit a channel state information (CSI) RS for extraction of CSI to a relay and a macro terminal is disclosed. The base station transmits information on a sub frame containing the CSI RS to the relay or the macro terminal. The macro terminal and the relay receive the CSI RS using the information on the sub frame. The macro terminal and the relay extract the CSI using the CSI RS and transmit the extracted CSI to the base station.

Claims

1. A method for a base station to transmit reference signal, the method comprising:

transmitting a pattern information on sub-frames containing CSI (Channel State Information) reference signal among consecutive sub-frames to a terminal or a relay; and

transmitting the CSI reference signal on the sub-frames corresponding to the pattern information to the terminal or the relay.

2. The method of claim 1, wherein the pattern information includes information on transmission period and offset of the sub-frames containing the CSI reference signal.

3. The method of claim 2, wherein the transmission period or the offset of the sub-frames containing the CSI reference signal is configured identically or differently with transmission period or offset of sub-frames containing CSI reference signals of other cells.

4. The method of claim 2, wherein the pattern information includes one or more transmission periods and one or more offsets.

5. The method of claim 2, wherein the CSI reference signal is not transmitted in special sub-frames although the special sub-frames correspond to the transmission period and the offset.

6. The method of claim 5, wherein the special sub-frames are MBSFN sub-frames designated for a MBMS service or backhaul downlink sub-frames.

7. The method of claim 5, further comprising:

transmitting position information on the special sub-frames to the terminal or the relay.

8. A method for a terminal or a relay to receive reference signal, the method comprising:

receiving a pattern information on sub-frames containing CSI (Channel State Information) reference signal among consecutive sub-frames from a base station; and

receiving the CSI reference signal on the sub-frames corresponding to the pattern information from the base station.

9. The method of claim 8, wherein the pattern information includes information on transmission period and offset of the sub-frames containing the CSI reference signal.

10. The method of claim 9, wherein the pattern information includes one or more transmission periods and one or more offsets.

11. The method of claim 9, wherein the CSI reference signal is not received in special sub-frames although the special sub-frames correspond to the transmission period and the offset.

12. The method of claim 11, further comprising:

receiving position information on the special sub-frames from the base station.

13. A method for a base station to transmit reference signal, the method comprising:

transmitting an indication information on CSI-RS sub-frames containing Channel State Information reference signal among consecutive sub-frames to a terminal or a relay; and

transmitting the Channel State Information reference signal on the CSI-RS sub-frames corresponding to the indication information to the terminal or the relay;

wherein the indication information includes at least one of

1) transmission period and offset of the CSI-RS sub-frames,

2) an identifier list of the CSI-RS sub-frames,

3) an information indicating whether the Channel State Information reference signal exists in a k-th next sub-frame, and

4) a bitmap information indicating the CSI-RS sub-frames.

14. A method for a terminal or a relay to receive reference signal, the method comprising:

receiving an indication information on CSI-RS sub-frames containing Channel State Information reference signal among consecutive sub-frames from a base station; and

receiving the Channel State Information reference signal on the CSI-RS sub-frames corresponding to the indication information from the base station;

wherein the indication information includes at least one of

1) transmission period and offset of the CSI-RS sub-frames,

2) an identifier list of the CSI-RS sub-frames,

3) an information indicating whether the Channel State Information reference signal exists in a k-th next sub-frame, and

4) a bitmap information indicating the CSI-RS sub-frames.