一种支持实时多媒体业务的LTE无线资源调度算法

A Real-time Multimedia Services QoS-based Wireless Resources Scheduling Algorithm in LTE System

针对现有LTE下行传输调度未能保证实时多媒体业务服务质量(Quality of Service,QoS)的问题,提出一种改进的支持实时多媒体业务QoS的两层调度方案。该方案的上层根据实时业务时延门限要求从无线帧的角度采用改进算法计算每帧的数据包调度量,下层在保证实时业务QoS的基础上以提高非实时业务吞吐量为目标为混合业务分配无线资源。最后与现有经典调度算法仿真比较,结果表明该算法获得最低的实时业务丢包率,有效保障了实时业务的QoS,同时获得较高的非实时业务吞吐量。

The classical scheduling algorithms of LTE downlink transmission cannot ensure the QoS （ Quality of Service） of real-time multimedia services. This paper proposes an improved two-level scheduling solution that can support the QoS of real-time multimedia. The upper level module adopts the improved algorithm to compute the amount of data that would be transmitted within one wireless frame according to the delay requirements of the real-time services. The lower level module allocates the wireless resources for mixed services to ensure the QoS of real-time services and increase the total throughput. Finally, the simulation results demonstrate the performance comparison between the proposed algorithm and classical scheduling algorithms. The proposed algorithm has the lowest packet loss rate of real-time services and improves the throughput of the non-real time services.