Control method of wireless streaming media self-adapting mixing FEC/ARQ based on Kalman filtering

Abstract

The invention discloses a control method of wireless streaming media adaptive mixing FEC/ARQ based on Kalman filtering, belongs to multimedia communication adaptive error control field in wireless dynamic network. The method uses cross-layer design and uses Kalman filter to predict current network status (packet loss ratio) in data link layer, adaptively regulates forward error correction (FEC) parameter of link layer and automatic repeat request (ARQ) parameter of link layer; on the other hand, uses adaptive FEC strategy in application layer, adaptively regulates sending speed of video frame according to current network status, and distributes network bandwidth dynamically between the video source data and the redundant data. The invention provided method can make receiver obtain maximum playback frame rate and improves reliability and real time of streaming media transmission effectively.

Description

technical field [0001] The invention relates to a Kalman filtering-based wireless streaming media adaptive hybrid FEC / ARQ control method in the field of multimedia communication adaptive error control in a wireless dynamic network. Background technique [0002] Compared with traditional data transmission, streaming media applications have special QoS (Quality of Service) requirements: [0003] 1. Streaming media transmission has high real-time requirements, and the Internet uses a store-and-forward mechanism. Queuing may occur in the forwarding router, and the routes of data packets may also be different, so the transmission delay of packets reaching the destination It may also be different. Considering the synchronization between multimedia packets, if the delay jitter is too large, it will inevitably have a certain impact on streaming media playback. For example, for video conferencing systems, the International Telecommunication Union ITU-T proposes that the one-way dela...

AI Technical Summary

Problems solved by technology

When the available bandwidth of the network is less than the bandwidth required for normal streaming media playback, it will cause network congestion and collapse and excessive delay, which will inevitably affect the playback quality of streaming media

[0005] 3. Streaming media transmission can allow a certain degree of packet loss rate, but when the packet loss rate is too large, it will affect the playback quality of streaming media

FEC technology does not need to feed back information to the sender, and has the characteristics of small delay and good real-time performance, but the decoding mechanism is complicated, and its complexity increases with the improvement of error correction capability

[0008] The wireless mobile network is a dynamic network environment with limited bandwidth, high bit error rate, and unstable channel quality. In addition, the movement of wireless nodes will also cause dynamic changes in the network topology, and multiple mobile users will share channels. Competition occurs, the attenuation and distortion are serious during wireless signal transmission, and even factors such as random interference and obstacles will seriously affect the quality and efficiency of wireless communication

Obviously, providing quality of service (QoS) guarantees for streaming media applications in a wireless communication environment is much more complicated than that in a wired network

The existing TCP / IP architecture and some protocol mechanisms do not fully consider some inherent characteristics of wireless communication, which greatly reduces the performance of the network system in a dynamic wireless communication environment

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