基于修正的最大加权时延优先的改进调度算法

Improved scheduling algorithm based on modified largest weighted delay first

针对修正的最大加权时延优先(M_LWDF)算法资源利用率较低的问题,提出一种用于LTE的下行调度算法。新算法通过对逻辑信道优先级进行二次计算来优化资源分配,通过提高资源的利用效率来提高系统的吞吐量,同时添加补偿因子以弥补由此带来的实时业务公平性下降的缺陷。仿真结果表明,新算法在保证实时业务服务质量(QoS)的前提下,提高了整个系统的吞吐量(用户数为35时提高了约18.0%),降低了系统的丢包率(用户数为50时降低了31.25%)。

Aiming at the problem of Modified Largest Weighted Delay First （M_LWDF） algorithm with low resource utilization, a new downlink scheduling algorithm for Long Term Evolution （LTE） was proposed. The new algorithm can optimize the allocation of resources by calculating the logical channel priority twice and improve system throughput by improving the efficiency of resource utilization, while a compensation factor is added to compensate for the shortcomings of the reduction of real-time business fairness. The simulation results show that the new algorithm, under the premise of Quality of Service （QoS） in real-time business, improves the throughput of the entire system （increased by 18.0% when users＇ number adds to 35） and reduces the packet loss rate of the system （reduced by 31.25% when users＇ number adds to 50）.