Data transmission method and data transmission device

Abstract

Embodiments of the invention provide a data transmission method and a data transmission device. The method comprises the following steps: when a source node needs to send data, calculating routing metric values corresponding to all paths from the source node to a destination node according to loading capacities corresponding to the paths; according to the routing metric values, determining the path with minimum loading capacity as a main path, and determining all the paths other than the main path as alternate paths; judging whether the number of coding groups sent by the source node reaches a preset threshold; if the number of coding groups sent by the source node reaches the preset threshold, generating a second degree through a degree adjustment function, and transmitting the coding groups generated through coding processing to the destination node through the main path and the alternate paths; and judging whether data needing to be sent by the source node is sent, and if the data is sent, returning to the step of judging whether the number of coding groups sent by the source node reaches the preset threshold. By implementing the embodiments of the invention, efficient transmission of data in a wireless multi-hop network is realized.

Description

technical field [0001] The invention relates to the technical field of network data transmission, in particular to a data transmission method and device. Background technique [0002] With the rapid development of multimedia technology, the requirements for the quality and rate of multimedia data transmission are getting higher and higher, especially for the transmission of multimedia data in wireless multi-hop networks. On the other hand, due to the unstable structure of the wireless multi-hop network, the transmission path often changes, and the data is easily interfered in the transmission process of the wireless signal, and the packet loss rate is high. The data recombination efficiency at the receiving end is low, resulting in a low accuracy rate of data transmission, all of which have a negative impact on the transmission of multimedia data in the wireless multi-hop network. [0003] At present, AOMDV (Ad Hoc On-demand Multipath Distance Vector Routing, Ad Hoc On-dema...

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Problems solved by technology

[0007] However, when data is transmitted in parallel with multiple paths, if the selected primary path is inappropriate, for example, a path with a large load is selected as the primary path, the data transmission speed will be seriously affected

In addition, when using LT codes to encode according to the degree distribution function, if the degree distribution function generates a higher degree, although it can cover more source data groups, it will increase the workload of decoding processing; on the contrary, if the degree distribution function generates The degree is low, although the workload of decoding processing is small, but because the source data packets covered by encoding processing are less, the success rate of data recovery at the receiving end is low, which affects the transmission quality

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