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Wireless cooperative relay network-based hierarchical random network coding method

A random network coding and cooperative relay technology, applied in the field of network coding and cooperative communication, can solve the problem of unreliable physical channel

Inactive Publication Date: 2011-06-15
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the physical channel of the actual wireless network becomes unreliable due to factors such as multipath fading

Method used

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  • Wireless cooperative relay network-based hierarchical random network coding method
  • Wireless cooperative relay network-based hierarchical random network coding method
  • Wireless cooperative relay network-based hierarchical random network coding method

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Experimental program
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Embodiment Construction

[0021] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0022] The wireless cooperative relay network described in the present invention, as attached figure 1 shown, including source node-receiver node and relay nodes , the data transmission of the network is divided into two phases. In the first phase, all source nodes send data packets in turn, and in the second phase, the relay nodes in the activated state send data packets in turn; the second phase includes the following steps:

[0023] Step A. All relay nodes determine whether they can correctly receive the signal sent by the source node according to the signal received by their physical layer, and classify the relay nodes according to the number of correctly received source nodes: correctly receive the source node Relay nodes with more nodes have higher priority, and relay nodes with the same number of correctly received source nodes have the sa...

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Abstract

The invention discloses a wireless cooperative relay network-based hierarchical random network coding method. In the method, relay nodes are graded according to the number of information source nodes accurately received by the relay nodes, the relay node capable of accurately receiving more information source nodes has higher priority, the relay node with higher priority can be preferably selected for judging whether to perform valid network coding according to the information acquired from the information source nodes and other relay nodes, if so, the relay node is in an activated state, performs random network coding on the network decoded data packet and forwards the coded data packet; otherwise, the relay node is in an idle state. With the method provided by the invention, the outage probability of a receiving node end can be reduced.

Description

technical field [0001] The invention relates to a network coding method of a wireless network, in particular to a hierarchical random network coding method based on a wireless cooperative relay network, and belongs to the field of network coding and the field of cooperative communication in wireless communication. Background technique [0002] Network coding technology was first proposed by scholars such as Ahlsuedu in " IEEE Tran. Info. Theory , 2000, 46(7):1204-1216" in the paper "Network information flow". The paper pointed out that if the intermediate node encodes the received data packet at the network layer and then forwards it instead of directly Routing and forwarding, network capacity can be improved accordingly. Current network coding technology can be divided into two types: deterministic network coding technology and random network coding technology. Deterministic network coding can achieve better system performance, but it needs to know the topology of the entir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W28/16
Inventor 梅中辉杨震孔媛媛
Owner NANJING UNIV OF POSTS & TELECOMM