APPARATUS AND METHOD FOR REMOVING SELF-INTERFERENCE AND RELAY SYSTEM FOR THE SAME

• US 20100111018A1
• Filed: 10/22/2009
• Published: 05/06/2010
• Est. Priority Date: 10/23/2008
• Status: Active Grant

• Current Assignee: LG-Ericsson Company Limited (Telefonaktiebolaget LM Ericsson)
• Original Assignee: LG-Ericsson Company Limited (Telefonaktiebolaget LM Ericsson)
• Inventors: CHANG, Il Doo
• Granted Patent: US 8,224,242 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/15585 by interference cancellation

Abstract

An apparatus, a method and a relay system for removing self-interference (SI). If a relay transmitting end transmits relay-reference signals (R-RS) through a region where a base station does not transmit signals, based on a protocol predetermined with the base station, a relay receiving end obtains SI channel values from signals transmitted by the relay transmitting end and received through a self-interference channel with use of the R-RS, removes the SI from transmitting signals of an uplink or an downlink based on the SI channel values, and relays the SI removed transmitting signals.

Claims

1. An apparatus for removing self-interference (SI), the apparatus comprising:

a transmitting end configured to transmit relay-reference signals (R-RS) through a region where a base station does not transmit signals, based on a protocol predetermined with the base station; and

a receiving end configured to obtain SI channel values from signals transmitted by the transmitting end and received through a self-interference channel with use of the R-RS and to remove the SI from transmitting signals of an uplink or a downlink based on the SI channel values and to relay the SI removed transmitting signals.

2. The apparatus of claim 1, wherein the R-RS is transmitted with respect to at least one of a downlink (DL) and an uplink and mapped to a data transmitting region on a resource block (RB).

3. The apparatus of claim 2, wherein regions not used for transmitting the R-RS at the downlink include a reference signal (RS) signal transmitting region of the base station, a synchronization channel region, a common control channel region and a broadcasting channel region.

4. The apparatus of claim 2, wherein regions not used for transmitting the R-RS at the uplink include a demodulation RS (DMRS) signal transmitting region of an user equipment and a sounding reference signal (SRS) transmitting region for measurement of a UL channel.

5. The apparatus of claim 2, wherein the apparatus adopts a scheme of multiple antenna transmission, and every transmitting antenna transmits different R-RS patterns for.

6. The apparatus of claim 2, wherein the base station does not transmit data with the RB transmitting the downlink (DL) R-RS or the uplink (UL) R-RS.

7. A method of removing self-interference (SI), the method comprising:

registering an apparatus configured to remove self-interference at a base station;

at the SI apparatus, receiving parameters required for channel estimation from the base station;

at the SI apparatus, mapping relay-reference signals (R-RS) to regions where the base station does not transmit signals based on the parameters and transmitting the mapped R-RS signals through a transmitting end;

at a receiving end of the apparatus configured to remove the SI, obtaining SI channel values from the signals transmitted by the transmitting end through self-interference channel with use of the R-RS; and

at the receiving end, removing the SI from transmitting signals of the uplink or the downlink based on the SI channel values and relaying the SI removed transmitting signals.

8. The method of claim 7, wherein the R-RS is transmitted with respect to at least one of the downlink (DL) and the uplink (UL) and mapped to a data transmitting region on a resource block (RB).

9. The method of claim 8, wherein the parameters include parameter values for R-RS pattern to be transmitted to estimate the DL/UL SI, RBs for transmitting DL/UL R-RSs, transmitting periods of the DL/UL R-RS.

10. The method of claim 9, wherein regions not used for transmitting the downlink (DL) R-RS include a reference signal (RS) signal transmitting region of the base station, a synchronization channel region, a common control channel region and a broadcasting channel region.

11. The method of claim 9, wherein regions not used for transmitting the uplink R-RS include a demodulation RS (DMRS) signal transmitting region of an user equipment and a sounding reference signal (SRS) transmitting region for measurement of a UL channel.

12. The method of claim 9, wherein the apparatus adopts a scheme of multiple antenna transmission, and every transmitting antenna transmits different R-RS patterns.

13. The method of claim 9, wherein the base station does not transmit data with the RB transmitting the downlink (DL) R-RS or the uplink (UL) R-RS.

14. A relay system comprising:

a relay transmitting end configured to transmit relay-reference signals (R-RS) through a region where a base station does not transmit signals, based on a protocol predetermined with the base station; and

a relay receiving end configured to obtain SI channel values from signals transmitted by the relay transmitting end and received through a self-interference channel with use of the R-RS, to remove the SI from transmitting signals of an uplink or a downlink based on the SI channel values and to relay the SI removed transmitting signals.

15. The system of claim 14, wherein a full duplex scheme is adopted for transmitting/receiving interval at backhaul link between the base station and the relay.

16. The system of claim 14, wherein when several relays are in a region covered by one base station, different resource regions are allocated to every R-RSs.

17. The system of claim of claim 14, wherein when several relays are in a region covered by one base station, the same resource region is allocated to every R-RSs by generating sequences with good autocorrelation and constant cross-correlation and using the sequences as the R-RS.

18. The system of claim of claim 14, wherein the base station allocated resources for the R-RS in a fixed manner.