E-UTRA中一种多业务两步比率公平调度算法

符合3GPP多业务处理原则的子信道调度方案是影响E-UTRA系统性能的关键技术。为减少填充和提高多用户分集效应,提出了一种多业务两步比率公平调度算法。在不区分用户业务优先级的情况下,先采用实际缓存量替代传统比率公平算法中的传输速率来分配子信道;业务优先级高的未分配用户再按比率公平算法确认的优先权重从低到高来挤占业务优先级低的用户所分配的子信道,从而确保符合3GPP提出的服务完高优先级业务后再服务低优先级业务的多业务处理原则。仿真结果表明,该算法能在保证用户公平的基础上提高系统吞吐量。

A Multi-Service Two-Step PF Scheduling Scheme for E-UTRA

Sub-channel scheduling scheme satisfying the principle of multi-service operation in 3GPP is the key technology for E-UTRA. A multi-service two-step proportional fair （PF） scheduling scheme is proposed for reducing padding probability and increasing multi-user/service diversity. In the first step, the actual buffered data size is utilized to allocate sub-channels instead of the achievable data rate by the conventional PF algorithm. Service priority is not considered in this step. In the second step, the users in high service priority without enough resource allocation during the first step will occupy the resources assigned to the low prioritized user from low scheduling priority to high scheduling priority value computed by PF algorithm, which meets the principle of multi-service operation proposed by 3GPP. The simulation results demonstrate that the proposed scheme can increase throughput while maintaining the fairness among users.