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Scalable layered coding based multi-path transmission scheme

A technology of multi-path transmission and extended coding, applied in the field of multi-path transmission scheme, can solve the problems of energy consumption, increasing data redundancy, limiting backup paths, etc.

Inactive Publication Date: 2012-02-29
NANJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Although these two methods have certain effects, the former limits the potential of the backup path and will quickly consume the energy of the main path; the latter increases data redundancy and wastes resources and energy, and neither is effective Combining with the characteristics of the code stream after the video source has undergone scalable encoding, there is no suitable route for different code streams

Method used

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  • Scalable layered coding based multi-path transmission scheme
  • Scalable layered coding based multi-path transmission scheme
  • Scalable layered coding based multi-path transmission scheme

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Embodiment Construction

[0030] according to figure 2 The scene diagram assumes that the video data collected by node 6 needs to be sent to the sink node, the encoding method of the data is 4-level time-domain scalable coding, and the channel bandwidth is P, then the multipath transmission process of the video data from node 6 to the sink node is:

[0031] 1. The sink node floods interest messages to nodes 1, 2, 3, 4, 5, and 6. After each node receives the interest message, it creates an interest record table and records the T and ET of neighboring nodes.

[0032] 2. Node 6 collects the data that matches its own interest record table, performs 4-level time-domain scalable encoding on the video source, encodes it into 1 basic layer and 3 enhancement layers, and adds a header identification to each data packet , Base layer: , Enhancement layer 1: , Enhancement layer 2: , Enhancement layer 3: , Let the bit rates of the base layer and enhancement layers 1, 2, and 3 after encoding be ,,, (where <<<).

[0...

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Abstract

The invention relates to a scalable layered coding based multi-path transmission scheme, which comprises the following steps that: a sink node builds an energy time delay gradient ET and a time delay gradient T for each node; a video sequence is subjected to M-class scalable coding, and a bit rate of each layer after coding is ...., (wherein <K2 <...<), different marks are set for a basic layer and enhancement layers, P represents a channel bandwidth, if, then the base layer is transmitted only; if (1<q<M), then first q bitstream layers are transmitted, if, then M bitstream layers are transmitted; a first data packet in the bitstream layer to be transmitted is selected to be used as a detection data packet to be sent to the sink node; the sink node receives the detection data packet to carry out reverse path enhancement; and the subsequent bitstream layers select paths that the data packets with the same mark value pass to be used as transmission paths to send the data to the sink node. By using the scheme provided by the invention, the change in network bandwidth can be adapted, and the business requirements of different bandwidth users can be met.

Description

technical field [0001] The invention is a multi-path transmission scheme proposed for the code stream after scalable layered coding of video sources in the wireless multimedia sensor network. It is mainly used to solve the transmission problem of video information in a bandwidth-limited network, and belongs to the technical field of transmission in a wireless multimedia sensor network. [0002] Background technique [0003] The node energy in Wireless Multimedia Sensor Networks (WMSN) is limited, the network bandwidth is lower than that of wired channels, and there are many factors such as signal attenuation and noise interference, which make the video stream transmission face the problem of packet delay. Large-scale fluctuations, losses, flow restrictions, etc. To address these issues, it is necessary to study video encoding and transmission methods. Among the current coding technologies that are more suitable for real-time streaming media transmission are multi-descript...

Claims

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Application Information

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IPC IPC(8): H04N21/63H04N21/647H04N7/26H04N19/31
Inventor 张登银文军程春玲
Owner NANJING UNIV OF POSTS & TELECOMM
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