Resource Allocation for Layered Multicast Streaming in Wireless OFDMA Networks

In this paper, we focus on subcarrier and power allocation for layered multicast streams in OFDMA cellular networks, where the multicast stream is composed of a basic layer and an enhancement layer. Our goal is to maximize the system total throughput with a total power constraint and a minimum rate requirement. A low-complexity allocation algorithm is proposed, which combined the suitability-based subcarrier allocation (SSA) with the traditional water filling (TWF) for the base layer and an advanced water filling (AWF) for the enhancement layer. Besides, we present a throughput-based user selection (TUS) algorithm which selects a proper set of users to serve when the minimum rate requirement can not be satisfied. Simulation results show that our proposed algorithm can improve the system throughput and outage probability.