A Resource Allocation Scheme for MBMS with QoS Guarantees

Multimedia Broadcast/Multicast Service (MBMS) uses point-to-multipoint transmission mode, which can effectively improve the frequency utilization efficiency of the mobile communication system and becomes a hot research field of mobile communication. However, as the frequency selectivity of the wireless channel, the throughput of the MBMS system is always limited by the user with the worst channel quality. In order to overcome the frequency selective fading, resource allocation methods is widely studied in the research. In this paper, the improved resource allocation algorithm based on user QoS is proposed. Firstly, the subcarriers are allocated according the users´ urgency degree guaranteeing the QoS of all users, Secondly, the remaining subcarriers are allocated by the throughput maximization rule, Finally, the system throughput is further improved by the bit loading step with greedy algorithm. Simulation result shows that the proposed resource allocation scheme cannot effectively guarantee the QoS of all users in the group, but also can improve the system throughput as much as possible.