Video multi-path parallel transfer method in wireless self-organization network

Abstract

The invention discloses a video multi-path parallel transfer method is a wireless self-organization network, video data is distributed to optimal multiple paths for simultaneous transmission on the whole, and a data sending end is used for selecting the path with the minimal time delay for transmitting a data packet which constitutes the video data according to the situations of time delay and data packet sending rate of the multiple paths partially. The selection principle of the optimal multiple paths is to select a shortest path set in all the paths of the data sending end and a data receiving end, and then seek a maximal flow path set in the shortest path set, wherein the maximal flow path set which meets the requirements on video data transmission bandwidth comprises the multiple paths for simultaneously transmitting the video data. The sending end and the receiving end further comprise network state feedback and real-time flow control functions, the receiving end can calculate the time delay of a link according to the received data packet, the time delay of the link is fed back to the receiving end, and then the receiving end can dynamically adjust the data packet sending rate of all the paths according to the time delay of the link of the paths.

Description

technical field [0001] The invention relates to video transmission in a wireless ad hoc network, in particular to a video multi-channel parallel transmission method in a wireless ad hoc network. Background technique [0002] Ad Hoc wireless network, also known as mobile ad hoc network or multi-hop network, is a temporary network dynamically formed without any existing network infrastructure or centralized management. In the AdHoc wireless network, each mobile node not only acts as a host but also acts as a router to forward packet information for other nodes in the network that cannot communicate directly. Due to the limitations of the transmission power of the wireless nodes and the transmission range of the wireless network interface, the AdHoc wireless network in the prior art cannot meet the high requirements of the network bandwidth and delay of the streaming media transmission technology represented by video transmission. The specific performance is: [0003] 1) In t...

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Problems solved by technology

[0003] 1) In the data network of the prior art, the establishment of the routing table is based on the measurement of the length of the path as a single reference

If a single shortest path is used to transmit multimedia services in an AdHoc network, due to the limitation of the transmission power of wireless nodes and the transmission range of wireless network interfaces, it is difficult to ensure that end-to-end bandwidth and packet delay requirements in video transmission are met, resulting in increased video transmission delay ;

[0004] 2) The data flow distribution method of the streaming media transmission technology of the prior art is to divide the data into several blocks according to the sequence of the video stream, and then transmit these several blocks of data along different paths, because the delay of each path is different , this traffic allocation mechanism will bring a lot of trouble to the data reorganization of the destination end. Since the transmission bandwidth of the wireless node is smaller than that of the wired network, the data flow must be divided into smaller data packets than the wired network, which leads to The calculation of data reorganization is aggravated, which consumes more overhead, and the video reception is not smooth

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