摘要： 相对区分服务中成比例延迟区分(PDD)服务模型算法的公平性不高。为此，提出一种基于概率的增强型区分服务算法WPPLQ。该算法对等待时间的计算进行优化，利用数据包大小确定服务响应时间，适用于移动定位服务平台。在NS-2模拟器上的仿真结果表明，PLQ和WPPLQ均符合PDD区分服务模型的性能要求，在高带宽情况下，WPPLQ具有更高的公平性。

关键词: 区分服务, 比例延迟区分, NS-2模拟器, 等待时间, 移动定位服务

Abstract: For fair shortcomings of current existing algorithms of the Proportional Delay Differentiated(PDD) services model in the relative differentiated, the enhanced algorithm for differentiated service based on probability(WPPLQ) for the mobile location services platform is proposed. This algorithm in calculating the waiting time is optimized to make it more accurate, and by calculating the packet size to determine the service response time, so that the scheduling algorithm is more fair. By the NS-2 simulation platform, the algorithm is simulated and tested. It is verified that the PLQ algorithm and the WPPLQ algorithm are in line with performance requirements which grading the quality of service and feasibilities of differentiated service in PDD model. And it show that WPPLQ algorithm has higher fairness.

Key words: differentiated service, Proportional Delay Differentiation(PDD), NS-2 simulator, waiting time, mobile Location Based Service(LBS)

中图分类号: 

• TP393