Multicast resource allocation scheme with QoS guarantee in SFN

We propose a multicast resource allocation scheme in single frequency networks to maximize the total rate while guaranteeing quality-of-service (QoS) requirement of real-time service. In this scheme, we first design a user connection control algorithm to reduce feedback load. The algorithm determines to which base stations users should feedback channel state information. We then formulate a joint subcarrier and power allocation issue and find that it has high complexity. Hence, we first distribute subcarriers and propose proportional allocation strategy to achieve tradeoff between fairness and QoS. Next, an iterative water-filling power allocation is proposed to fully utilize the limited power. To further decrease complexity, fixed power iterative scheme is introduced. Simulation results show that the proposed scheme greatly improves system performance while reducing 83% of the feedback overhead. Besides, the fixed power iterative strategy is suitable for practical system due to low complexity.