Method for distributing optimum rate for extensible video stream multi-rate multi-cast communication

Abstract

The invention relates to a method for distributing optimum rate for an extensible video stream multi-rate multi-cast communication. In order to maximum whole user efficiency under a heterogeneous network environment, the invention comprises the following steps of: (1) carrying out combined optimization to the network codes and network flux control of multi-rate and multi-path route and relay node; (2) when selecting the optimum multi-cast transmission path and distributing all layers of video stream transmission rates, considering the code stream priority problem of the video coding layer simultaneously; for the one hand, searching the transmission network of the minimum cost for each video coding layer; and for the other hand, simultaneously meeting the requirement of dependency of the extensile video codes layers; and (3) realizing the optimum distribution of the resource and facilitating the distribution-type solution by adopting a complete distribution-type rate distribution arithmetic, namely adopting a Lagrange dual method to decompose the original convex optimization problem into two sub-optimization problems of high-order and low-order. The introduction of network codes not only improves the whole throughput of the network but also provides better video quality for the receiving terminals simultaneously.

Description

technical field [0001] The invention relates to an optimal rate allocation method for multi-rate multicast communication of scalable video streams, including the construction of a distribution network, the allocation of link rates, multi-path routing, distributed algorithm design and the like. In order to maximize the overall utility of users in a heterogeneous network environment, combined with methods such as multi-rate multi-path routing, network coding technology and network flow control, a distribution network with the least transmission cost is sought for each video coding layer to meet the needs of scalability. The need for dependencies between video coding layers. technical background [0002] Multi-rate multicast technology has become one of the important technologies for video content distribution in heterogeneous networks because it can adapt to the needs of different users and the time-varying network environment. From the perspective of source coding, the layer...

AI Technical Summary

Problems solved by technology

Existing rate allocation schemes use network coding technology to improve the throughput of layered multicast, but these schemes mainly focus on maximizing the throughput of the entire network or maximizing the number of video layers received by the receiving end. The problem is reduced to an integer linear programming problem, ignoring the maximization of user video receiving utility and the inter-layer dependency problem of scalable video coding

Images