基于QoS保证的MBMS资源分配方案

MBMS(Multimedia Broadcast Multicast Service) 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 wirless channel, the throughout 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 remained the subcarriers are allocated by the maxmizing-throughout rule; Lastly, the system throughout is further improved by the bit loading step with greedy algorithm. Simulation result shows that the proposed resource allocation scheme can not effectively guarantee the Qos of all users in the group, but also can improve the system throughtout as much as possible.