A method of multi-path data transmission in tdma wireless network based on network coding

Abstract

The invention discloses a TDMA wireless network multi-path data transmission method based on network coding, which belongs to the technical field of communication. The method includes establishing a finite field of network coding coefficients when the source node is initialized, performing linear random network coding on the m initial data packets of the pre-sent data, and obtaining the optimal path and the neighbor node set of the suboptimal path for multi-path forwarding in combination with routing search Reply with the received ACK to select the next hop relay node, each relay node randomly selects the encoding coefficient from the finite field of network encoding coefficients for the received encoded data packet, re-encodes the encoded data packet and sends it to the next Successive nodes until the destination node receives more than or equal to m coded data packets with linearly independent coefficient vectors and restores the initial information vector from them. Through the combination of the multi-path routing strategy and the network coding strategy, the present invention improves the network throughput and enhances the reliability of data transmission, and at the same time relieves the problem of network congestion caused by multiple paths sending data simultaneously.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a network coding-based TDMA wireless network multi-path data transmission method. Background technique [0002] Data transmission is the basic function of a wireless network. Because wireless channels are easily affected by the surrounding environment, transmission distance, mobility, etc., the transmission bit error rate is high, the link state is unstable, and the topology changes dynamically. The wireless multi-hop network with self-organized flexible networking is quite different from the conventional network, and the reliable data transmission capability is severely limited. [0003] The traditional wireless network is based on "store-and-forward" and adopts a hop-by-hop retransmission confirmation mechanism to improve the reliability of data transmission. In the case of poor communication link quality, frequent retransmissions lead to low channel bandwidth utilizatio...

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Problems solved by technology

In the case of poor communication link quality, frequent retransmissions lead to low utilization of channel bandwidth

[0004] Multi-path routing strategies are widely used at the network level to improve the reliability of data transmission, but it will also cause network congestion caused by multiple paths sending data at the same time, and the existing multi-path mechanisms are pre-calculated and The transmission path is determined without taking into account the network coding opportunities that exist during the packet transmission process

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