一种LTE中MBMS系统的自适应调度算法

An Adaptive Scheduling Algorithm of MBMS in LTE System

多媒体广播多播服务(Multimedia Broadcast/Multicast Service,MBMS)为多媒体广播提供了有效的解决方案,但点对多点(Point-To-Multipoint,PtM)模式下的MBMS系统性能很大程度上受最差信道状况用户的制约。对此,文中提出一种适用于PtM模式下MBMS系统的自适应调度算法,该算法将链路自适应和用户反馈的平均丢包率结合,在选择MBMS组的发送数据速率时,综合考虑信道状况和组内用户的满意度,实现了多播增益和多用户分集的平衡。经过多种场景仿真,结果显示该算法在用户满意度达到要求的基础上提高了系统吞吐量。

Muhimedia broadcast/multicast service （MBMS） provides an effective solution for multimedia broadcast service. However, due to those users which under the worst channel condition , the performance of multicast system is strictly limited. To solve this problem , an adaptive scheduling algorithm for MBMS system in PtM mode is proposed. It adjusts the transmission rate according to average packet loss rate and provides better balance between muhicast gain and multiuser diversity . The simulation results show that the proposed algorithm can effectively improve the system throughput without sacrificing user＇s satisfac- tion.