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Wireless Ad hoc network real-time multimedia video transmission method

A technology of video transmission and transmission method, which is applied in the field of wireless self-organizing Ad hoc network and real-time multimedia video service, can solve problems such as inability to estimate link utilization and available bandwidth, and achieve the effect of increasing detection accuracy and reducing detection overhead

Inactive Publication Date: 2008-05-07
ZTE CORP
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AI Technical Summary

Problems solved by technology

②In the 802.11DCF mode, each node of the competing channel interferes with each other, and in the case of multi-hop, there is also the influence of hidden nodes, and the available bandwidth cannot be estimated by measuring the link utilization rate between two points

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  • Wireless Ad hoc network real-time multimedia video transmission method
  • Wireless Ad hoc network real-time multimedia video transmission method
  • Wireless Ad hoc network real-time multimedia video transmission method

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Embodiment Construction

[0045] At first, the thinking of the present invention is illustrated for the processing of each specific problem that must be solved:

[0046] (1) Technical problems that must be solved for real-time multimedia video transmission in a wireless Ad hoc network using the IEEE 802.11MAC layer protocol, including: ① reducing the cost of detecting link failures and increasing detection accuracy; Calculation of available bandwidth of nodes interfering with each other; ③Quick processing after link failure.

[0047] The present invention mainly aims at the above three problems, and provides the following three methods and strategies: (2) adaptive link failure detection technology, (3) wireless Ad hoc network path available bandwidth calculation algorithm, (4) backup video transmission support routing mechanism.

[0048] The following are the specific descriptions of the above three methods and strategies:

[0049] (2) Adaptive link failure detection technology:

[0050] In order to...

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Abstract

The invention relates to a wireless Ad hoc network real-time multimedia video transmission method, which includes that one or a plurality of paths, the available bandwidth of which satisfies the multimedia video transmission quality requests, are chosen to be used as the main path or the main and reserved paths according to routing requests. The node available bandwidth equals to the difference between the effective bandwidth of a network layer which is multiplied by the difference between one and Alpha and the bandwidth occupied sum of the node and the neighborhood node. The main path is used for transmitting the real-time multimedia video. At the same time, the main path is switched to the reserved path for the transmission according to the failure detection result of the main path. And the renewed selection or the maintenance detection is implemented according to the existence of the reserved path and the renewed selection is implemented again according to the failure maintenance detection result. The detection of the main path is that upstream nodes actively send the ACK request irregularly according to the last successfully received current network condition which is responded by the round trip time LAST_ACK_RTT of response ACK signals to downstream nodes and judge the effectiveness of link paths and the main path according to the returned result. The real-time video business is realized on the basis of the invention.

Description

technical field [0001] The invention relates to a small-scale wireless self-organizing Ad hoc network and a real-time multimedia video service, in particular to a method for building a reliable temporary broadband wireless multimedia communication network based on the Ad hoc network to transmit real-time multimedia video and realize real-time multimedia video service. Background technique [0002] With the increasingly widespread application of wireless network technology, there are increasingly higher requirements for wireless network transmission in terms of transmission distance, system performance, and business scope. Among them, real-time multimedia video services will be an important aspect of future wireless network technology applications. direction. Existing wireless communication networks all have a center, that is, a base station laid in advance, and wireless transmission occurs within a hop range between the wireless terminal device and the base station, such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L12/28H04L1/16H04L12/56H04L47/2466
Inventor 向继东张连芳窦志斌廖志
Owner ZTE CORP
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