Granted Patent B2

US 8,918,048 · App. 13/580,999 · Granted Dec 23, 2014

Abstract

Claims (26)

1. A method for communication based on relaying in a wireless communication network having a number of network nodes, said communication network including a designated originating node, a relay node and a destination node, and said method comprising:

said originating node transmitting a message intended for said destination node;

said relay node receiving a first signal representative of said message transmitted from said originating node, wherein a transmission from an interference source causes interference in the received first signal;

said destination node receiving a second signal representative of said message transmitted from said originating node, wherein said transmission from said interference source causes interference in the received second signal;

said relay node detecting interference from said interference source in the received first signal and which part of said message is affected by the interference, called the interfered part of the message;

said relay node performing a partial retransmission based on the interfered part of the message;

said destination node receiving a third signal representative of the interfered part of the message transmitted from said relay node; and

said destination node detecting at least part of said message based on the received second signal representative of said message transmitted from said originating node and the received third signal representative of the interfered part of the message transmitted from said relay node.

2. The method of claim 1 , wherein the relay node detects the interference from the interference source in the received first signal and detects which part of the message is affected by the interference, based on detecting the interference in at least one of the time domain and the frequency domain.

3. The method of claim 1 , wherein the relay node detects the interference from the interference source in the received first signal and detects which part of the message is affected by the interference, based on Signal-to-Interference Ratio (SIR) or Signal-to-Interference-plus-Noise Ratio (SINR) measurements.

4. The method of claim 1 , wherein the relay node detects the interference from the interference source in the received first signal and detects which part of the message is affected by the interference, based on evaluating soft values, each soft value representing the reliability of a received bit of information.

5. The method of claim 1 , wherein performing the partial retransmission is based on Amplify-and-Forward (AF) relaying.

6. The method of claim 1 , wherein performing the partial retransmission is based on Decode-and-Forward (DF) relaying.

7. A relay node configured for operation in a wireless communication network, said relay node comprising:

a receiver configured to receive a signal representative of a message transmitted from an originating node and intended for a destination node, wherein a transmission from an interference source causes interference in the received signal;

an interference detector configured to detect interference from said interference source in the received signal and which part of said message is affected by the interference, called the interfered part of the message; and

a forwarding unit configured to perform a partial retransmission to said destination node, based on the interfered part of the message.

8. The relay node of claim 7 , wherein the interference detector is configured to detect the interference in the received signal and which part of the message is affected by the interference, in at least one of the time domain and the frequency domain.

9. The relay node of claim 7 , wherein the interference detector is configured to detect the interference in the received signal and which part of the message is affected by the interference, based on evaluation of Signal-to-Interference Ratio (SIR) or Signal-to-Interference-plus-Noise Ratio (SINR) measurements.

10. The relay node of claim 7 , wherein said interference detector is configured to detect the interference in the received signal and which part of the message is affected by the interference, based on evaluation of soft values, each soft value representing the reliability of a received bit of information.

11. The relay node of claim 7 , wherein said forwarding unit includes a selector configured to select a limited set of signal information for transmission to said destination node, based on control information from the interference detector that is representative of which part of the message is affected by the interference.

12. The relay node of claim 7 , wherein the forwarding unit is configured to perform a partial retransmission based on Amplify-and-Forward (AF) relaying.

13. The relay node of claim 7 , wherein the forwarding unit is configured to perform a partial retransmission based on Decode-and-Forward (DF) relaying.

14. A destination node configured for operation in a wireless communication network, said destination node comprising:

a receiver configured to receive a signal representative of a message from an originating node, wherein a transmission from an interference source causes interference in the received signal, wherein said receiver is configured to also receive a signal representative of an interfered part of the message from a relay node; and

a signal detector configured to detect at least part of said message based on combining a representation of the received signal from said originating node and a representation of the received signal from said relay node.

Assignments (8)