Optimal Layer Rate Allocation in Layered Media Multicast Based on Network Coding
基于网络编码的分层媒体多播中的层速率分配优化

This paper focuses on layer rate allocation in network coding based layered media multicast. The sum of receiving rates of all receivers is maximized by optimizing layer rate allocation. Since it is a nonlinear integer programming, a heuristic algorithm, MRAA (M-layer Rate Allocation Algorithm), is proposed with the time complexity O(|V||T|2|E|2) to solve it. Algorithm MRAA decomposes the network graph into several subgraphs, and the minimum of the maximum flows of all receivers in each subgraph is the corresponding layer rate. Numerical results indicate that the algorithm MRAA can increase the network throughput by 15%-18% and improve the average bandwidth utilization rate of the receivers by 6%-10%, compared with the algorithm in the existing work.