IEEE802.16 Mesh网基于区分服务的时隙分配机制  

A DiffServ-Based Slot Allocation Mechanism in IEEE802.16 Mesh Networks

作　　者：俞浚 

机构地区：[1]南京工业大学计算机科学与技术系,江苏南京210009

出　　处：《微电子学与计算机》2013年第12期81-84,共4页Microelectronics & Computer

基　　金：江苏省科技支撑计划(工业)项目(BE2011186)

摘　　要：时隙分配是IEEE802.16无线Mesh网的关键技术之一.提出一种基于区分服务的时隙分配机制(DSSA).首先调整每一个调度窗口的开始时间以优化每次处理的业务数量.然后DSSA为窗口内的实时、非实时业务划分不同的时隙搜索范围,目的是为实时业务预留出一部分时隙以满足其时延要求.最后DSSA周期性的统计两种业务到达率,根据历史统计值提前对两种业务达到情况进行预测,依据预测值动态地调整预留时隙的大小.实验结果表明DSSA可以显著提高实时业务的调度效率,同时兼顾了非实时业务的时隙分配需求.The slot allocation is one of the key technologies in IEEE802. 16 mesh networks. This paper proposes a diffserv-based slot allocation mechanism （DSSA）. At first, we adjust the start time of scheduling window, in order to optimize the number of the scheduled tasks. Then, we assign different search scopes with scheduling window, in accordance with the type of tasks, with an objective to achieve slot reservation that satisfies the requirement in delay of real-time tasks. Finally, I）SSA records the arrival rates of tasks periodically, which is used to predict the number of arriving tasks. We can adjust the number of reserved slots according to the predicted value. Our simulation results demonstrate that, DSSA can efficiently enhance the scheduling efficiency of the real-time tasks, while satisfying the requirement in slot allocation of non-real-time tasks.

关 键 词：IEEE802 16无线Mesh网 分布式协调调度 区分服务 时隙分配 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]