基于机会调度的无线组播传输能效优化

Transmission energy efficiency optimization for wireless multicasting using opportunistic scheduling

为了提高移动通信系统中发射端的传输能效,该文提出了一种基于机会调度的组播方法,通过在保持发射功率不变的条件下减少满足所有组播用户服务质量(QoS)要求所需的发射时间来降低能耗。该方法首先利用正弦函数来模拟机会组播调度下用户的时隙级QoS限制,然后实时地根据各个用户对其时隙级QoS限制的满足程度优化不同时隙的组播速率。仿真结果表明:对于组播用户间平均信道条件相同或相差较少的场景,该方法在保证用户QoS要求的同时比已有组播调度方法降低了发射端的传输能耗。

An opportunistic scheduling-based multicasting method was developed to improve the transmission energy efficiency in mobile communication systems. This method lowers the energy consumption for satisfying all the multicast user quality of service （QoS） demands by reducing the total transmission time with the transmission power unchanged. The system uses a sinusoidal function to model the time slot-level QoS constraint on the users for opportunistic multicast scheduling and then optimizes the multicast rate in each time slot according to the need to meet each user＇s time slot level QoS constraint. Simulations show that, when the muhicast average user channel conditions are the same or only slightly different, this multicast method uses less transmission energy than existing multicast scheduling methods which guaranteeing the same user QoS.