ERROR CONTROL METHOD AND COOPERATIVE TRANSFER SYSTEM

• US 20080301534A1
• Filed: 07/25/2008
• Published: 12/04/2008
• Est. Priority Date: 01/25/2006
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: ZHENG, Ruobin
• Application Number:
  US12/179,820
• Publication Number:
  US 20080301534A1
• Time in Patent Office: Days
• US Class Current: 714/776
• CPC Class Codes: H04B 7/15521 combining by calculations packets received from different stations before transmitting the combined packets as part of network coding network coding aspects for detection or prevention of errors in the information received H04L1/0076; network traffic management with optimizing of information sizing, e.g. header compression, by using assembly and disassembly of packets H04W28/065
• CPC Class Codes: H04B 7/15592 Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path cooperative diversity H04B7/024
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0076 Distributed coding, e.g. network coding, involving channel coding coding in both space and time H04L1/0618; cooperative diversity H04B7/022
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems

Abstract

An error control method and a cooperative transfer system are provided. The method comprises: each node acting as a transfer node in a cooperative node group codes an acquired distributed information code block to obtain a corresponding distributed check code block and transmits the corresponding distributed check code block to a destination node; the destination node combines a received distributed check code block to generate a check code block and combines the distributed information code block transmitted by each node acting as a source node in the cooperative node group to generate an information code block; and the destination nod decodes the check code block and the information code block. The embodiment of the present invention may increase farthest the throughput of the transfer system and obtain additional cooperative path diversity and linear block code gain.

Claims

1. An error control method, comprising:

coding, by each node acting as a transfer node in a cooperative node group, an acquired distributed information code block to obtain a corresponding distributed check code block, and transmitting the corresponding distributed check code block to a destination node;

combining, by the destination node, a received distributed check code block to generate a check code block, combining the distributed information code block transmitted by each node acting as a source node in the cooperative node group to generate an information code block; and

decoding, by the destination node, the check code block and the information code block.

2. The method according to claim 1, wherein the coding to obtain the corresponding distributed check code block and transmitting the corresponding distributed check code block to the destination node comprises:

acquiring, by each node acting as the transfer node in the cooperative node group, the distributed information code block transmitted by each node acting as the source node in the cooperative node group;

combining, by each node acting as the transfer node in the cooperative node group, the acquired distributed information code block, performing a corresponding distributed linear block coding on the obtained information code block after the combination to obtain the corresponding distributed check code block and transmitting the corresponding distributed check code block to the destination node;

or

acquiring, by each node acting as the transfer node in the cooperative node group, the distributed information code block transmitted by each node acting as the source node in the cooperative node group and the distributed information code block of each node acting as the transfer node in the cooperative node group;

combining, by each node acting as the transfer node in the cooperative node group, the acquired distributed information code block, performing a corresponding linear block coding on the obtained information code block after the combination to obtain a check code block corresponding to a whole group composed of each source node, acquiring the distributed check code block corresponding to each node acting as the transfer node in the cooperative node group, and transmitting the distributed check code block to the destination node.

3. The method according to claim 1, before the coding to obtain the corresponding distributed check code block and transmitting the corresponding distributed check code block to the destination node, comprising:

transmitting, by each node acting as the source node in the cooperative node group, the distributed information code block thereof to each node acting as the transfer node in the cooperative node group thereof and the destination node.

4. The method according to claim 2, before the coding to obtain the corresponding distributed check code block and transmitting the corresponding distributed check code block to the destination node, comprising:

transmitting, by each node acting as the source node in the cooperative node group, the distributed information code block thereof to each node acting as the transfer node in the cooperative node group thereof and the destination node.

5. The method according to claim 4, wherein the transmitting the distributed information code block specifically comprises:

assigning an orthogonal frequency division multiplexing (OFDM) subchannel to a broadcast channel from the node acting as the source node in the cooperative node group to a cooperative transfer node group composed of each node acting as a transfer node in the cooperative node group thereof, and the destination node according to different OFDM sub-carrier clusters when an OFDM subchannel technology is employed; and

broadcasting, by each node acting as the source node in the cooperative node group, the distributed information code block thereof to each node acting as the transfer node and the destination node through different OFDM subchannels;

assigning a time division subchannel to a broadcast channel from the node acting as the source node in the cooperative node group to a cooperative transfer node group composed of each node acting as the transfer node in the cooperative node group thereof, and the destination node according to different timeslots when a time division technology is employed; and

broadcasting, by each node acting as the source node in the cooperative node group, the distributed information code block thereof to each node acting as the transfer node and the destination node through different time division subchannels;

or

assigning a spread spectrum code to a broadcast channel from the node acting as the source node in the cooperative node group to a cooperative transfer node group composed of each node acting as the transfer node in the cooperative node group thereof, and the destination node according to different spreading codes when a code division technology is employed; and

broadcasting, by each node acting as the source node in the cooperative node group, the distributed information code block thereof to each node acting as the transfer node and the destination node through different spread spectrum codes.

6. The method according to claim 1, before the coding to obtain the corresponding distributed check code block and transmitting the corresponding distributed check code block to the destination node, further comprising:

assigning an OFDM subchannel to a transfer channel from each node acting as the transfer node in the cooperative node group to the destination node according to different OFDM sub-carrier clusters;

or

assigning a time division subchannel to a transfer channel from each node acting as the transfer node in the cooperative node group to the destination node;

or

assigning a spread spectrum code to a transfer channel from each node acting as the transfer node in the cooperative node group to the destination node.

7. The method according to claim 1, further comprising:

acquiring, by the destination node, a monitor matrix corresponding to a cooperative transfer node group composed of each node acting as the transfer node in the cooperative node group.

8. The method according to claim 7, when it is required to support dynamic self-adaptive linear block coding, further comprising:

transmitting, by each node acting as the transfer node in the cooperative node group, a distributed monitor matrix corresponding to each node acting as the transfer node in the cooperative node group to the destination node; and

combining, by the destination node, each received distributed monitor matrix to acquire the monitor matrix corresponding to the cooperative transfer node group composed of each node acting as the transfer node;

or

transmitting, by each node acting as the transfer node in the cooperative node group, a distributed system code element partial matrix corresponding to each node acting as the transfer node in the cooperative node group to the destination node when a check code element partial matrix in the monitor matrix corresponding to the cooperative transfer node group composed of each node acting as the transfer node in the cooperative node group is a unit matrix; and

combining, by the destination node, the distributed system code element partial matrix and constructing the monitor matrix corresponding to the cooperative transfer node group according to an obtained system code element partial matrix after the combination.

9. The method according to claim 1, wherein performing the decoding by the destination node comprises:

combining, by the destination node, the received distributed check code block transmitted by each node acting as the transfer node, combining the distributed information code block transmitted by each node acting as the source node in the cooperative node group and forming a linear packet code block according to the obtained check code block and information code block after the combination; and

decoding the linear packet code block according to the monitor matrix corresponding to the cooperative transfer node group composed of each node acting as the transfer node.

10. The method according to claim 6, wherein performing the decoding by the destination node comprises:

combining, by the destination node, the received distributed check code block transmitted by each node acting as the transfer node, combining the distributed information code block transmitted by each node acting as the source node in the cooperative node group and forming a linear packet code block according to the obtained check code block and information code block after the combination; and

decoding the linear packet code block according to the monitor matrix corresponding to the cooperative transfer node group composed of each node acting as the transfer node.

11. The method according to claim 7, wherein performing the decoding by the destination node comprises:

combining, by the destination node, the received distributed check code block transmitted by each node acting as the transfer node, combining the distributed information code block transmitted by each node acting as the source node in the cooperative node group and forming a linear packet code block according to the obtained check code block and information code block after the combination; and

decoding the linear packet code block according to the monitor matrix corresponding to the cooperative transfer node group composed of each node acting as the transfer node.

12. A cooperative transfer system for error control, comprising a cooperative node group and a destination node;

wherein;

the cooperative node group is adapted to code a distributed information code block acquired by each code acting as a transfer node in the cooperative node group to obtain a corresponding distributed check code block, and transmit the corresponding distributed check code block to the destination node; and

the destination node is adapted to combine the received distributed check code block, combine the distributed information code block transmitted by each node acting as a source node in the cooperative node group and decode a generated check code block and a generated information code block after a combination.

13. The system according to claim 12, wherein the transfer node in the cooperative node group comprises a receiver and a transmitter;

wherein;

the receiver is adapted to perform a channel decoding process on a received distributed information code block transmitted by each source node after successively performing a demodulating process and a symbol demapping process on the received distributed information code block and transmit a processed distributed information code block to the transmitter; and

the transmitter is adapted to acquire the distributed information code block transmitted by the source node or acquire the distributed information code block transmitted by the source node and the distributed information code block of the transmitter, perform a distributed linear block coding process after combining the obtained distributed information code block, and send out a processed distributed check code block after successively performing the corresponding symbol mapping process and a modulating process on an obtained corresponding distributed check code block;

or perform a linear block coding process on an obtained information code block after the combination to obtain the corresponding check code block and send out a processed distributed check block after successively performing the corresponding symbol mapping process and the modulating process on the distributed check code block corresponding to the transmitter.

14. The system according to claim 13, wherein the receiver comprises a demodulator, a symbol demapping unit and a channel decoding unit;

wherein;

the demodulator is adapted to demodulate the received distributed information code block and transmit the demodulated distributed information code block to the symbol demapping unit; and

the symbol demapping unit is adapted to perform the symbol demapping process on the received distributed information code block and transmit a demapped distributed information code block to the channel decoding unit to perform the channel decoding process.

15. The system according to claim 13, wherein the transmitter comprises:

a distributed linear block coding unit adapted to combine the received distributed information code block transmitted by each source node or combine the received distributed information code block transmitted by each source node with the distributed information code block of the transmitter, perform the distributed linear block coding process on the obtained information code block after the combination to obtain the corresponding distributed check code block and send out the distributed check code block;

or

a linear block coding unit adapted to combine the received distributed information code block transmitted by each source node or combine the received distributed information code block transmitted by each source node with the distributed information code block of the transmitter, perform the distributed linear block coding process on the obtained information code block after the combination to obtain the corresponding check code block and send out the check code block corresponding to the transmitter.

16. The system according to claim 15, wherein the transmitter further comprises a symbol mapping unit and a modulator;

wherein;

the symbol mapping unit is adapted to perform the corresponding symbol mapping process on the distributed check code block transmitted by the distributed linear block coding unit or the linear block coding unit, transmit a mapped distributed check code block to the modulator and send out after a corresponding modulating process.

17. The system according to claim 12, wherein the destination node comprises a broadcast channel decoding unit and a transfer channel decoding unit;

wherein;

the broadcast channel decoding unit is adapted to perform a channel decoding process on the distributed information code block broadcasted by each cooperative node and received by the destination node at a broadcasting stage, combine a decoded distributed information code block, output an estimated value of the information code block and transmit the estimated value of the information code block to the transfer channel decoding unit; and

the transfer channel decoding unit is adapted to combine the distributed check code block transmitted by each transfer node in the cooperative node group and received by the destination node at the transferring stage and decode an obtained check code block after the combination and the estimated value of the received information code block.

18. The system according to claim 17, wherein the destination node further comprises a demodulator and a symbol demapping unit;

wherein;

the demodulator is adapted to demodulate the distributed information code block broadcasted by each node in the cooperative node group and received by the destination node at the broadcasting stage and/or the distributed check code block transmitted by each transfer node in the cooperative node group and received by the destination node at the transferring stage; and

the symbol demapping unit is adapted perform the corresponding symbol demapping process on the processed distributed information code block and/or distributed check code block, transmit the distributed information code element to the broadcast channel decoding unit and transmit the distributed check code element to the transfer channel decoding unit.

19. The system according to claim 14, wherein the demodulator comprises an orthogonal frequency division multiplexing (OFDM) demodulator.

20. The system according to claim 16, wherein the modulator comprises an OFDM modulator.