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Transmitting method based on parallel batch network coding

A technology of network coding and transmission method, applied in the field of wireless communication network, can solve the problems of large end-to-end feedback delay, decreased transmission efficiency, low efficiency, etc. Effect

Inactive Publication Date: 2014-12-24
PLA UNIV OF SCI & TECH
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Problems solved by technology

The existing method can guarantee transmission reliability but the efficiency is not high. After the source node completes sending a batch and before receiving the confirmation message, it will send a large number of useless redundant packets, resulting in a decrease in transmission efficiency.
In particular, in long-distance (large hop) communication scenarios, the end-to-end feedback delay will be very large, which will cause a sharp deterioration of existing methods

Method used

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  • Transmitting method based on parallel batch network coding
  • Transmitting method based on parallel batch network coding
  • Transmitting method based on parallel batch network coding

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Embodiment Construction

[0030] Before describing the specific process, two definitions are introduced:

[0031] Definition 1 (degree of freedom, Degree offreedom): the number of linearly independent encoding packets needed for a node to decode a batch [5] .

[0032] Definition 2 (Delivery Rate of Freedom, DDR): The ratio of the number of linearly independent coded packets received by the destination node (that is, the reduction in degrees of freedom) to the number of coded packets sent by the source node, which is used to reflect the source node to the destination node when network coding is used connection quality.

[0033] In this method, the composition of functional modules and the interrelationships between modules are shown in figure 1 .

[0034] The concrete realization mode of the present invention is:

[0035] 1) Use network coding to transmit data information. The source node divides the data stream to be transmitted into batches containing the same number of N packets, and the packets ...

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Abstract

The invention relates to a transmitting method based on parallel batch network coding. According to the transmitting method, network coding is used for transmitting data, data flow to be transmitted is divided into batches comprising the same number of groups, the groups in each coding batch are coded and transmitted together, and a target node can decode one batch after receiving the enough number of the coded groups. The method can be applied to a wireless Mesh network, and provides reliable and efficient data transmission service; network coding is utilized for improving the transmission efficiency; to overcome the defect of low efficiency caused by an existing research and use stop wait strategy, the invention provides a parallel transmission method; a sending window which can dispatch a plurality of batches at the same time is maintained on a source node, and parallel dispatching of the multiple batches is controlled according to feedback information; in comparison with an existing research result, batch transmission can be organized more flexibly and efficiently, and then the end-to-end handling capacity is improved.

Description

technical field [0001] The invention relates to a method for transmitting data in a wireless Mesh network. On the basis of Network Coding (Network Coding), the method uses a parallel batch scheduling and transmission mechanism, which can organize batch transmission more flexibly and efficiently, thereby improving End-to-end throughput. The invention belongs to the field of wireless communication network. Background technique [0002] Wireless Mesh network is a kind of broadband multi-hop wireless network positioned at high capacity and high rate. It has the characteristics of quasi-stationary and weak energy constraints, and shows great advantages in network capacity, reliability, and robustness. In a wireless broadcast channel, each data transmission will be received by multiple nodes within the transmission range. Therefore, wireless networks including wireless Mesh networks present significant information redundancy. In the traditional "store-and-forward" transmission m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W72/12
Inventor 王海董超陈晨于卫波牛大伟米志超
Owner PLA UNIV OF SCI & TECH
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