摘要
针对无线网络中切换机制的性能问题,提出3种切换方案:基于时间的虚拟切换、局部分簇切换和覆盖切换方案。第一种方法使用计时器来触发移动节点和头节点之间的切换。第二种方法将网络进行分簇,只有簇头参与越区切换过程,从而最小化控制负载,并通过叶节点维持拓扑结构和连接性。第三种方法中覆盖结构完全负责越区切换的启动,减少与附近网络相关联的越区切换过程。实验结果表明,这3种方法在存在漫游移动节点的网络中都能够很好的实现网络切换。其中,当基站覆盖区域较小时,覆盖切换方案能够获得最优的切换成功率和延迟;而局部分簇方法能够获得最优的数据包投递率。
In order to solve the performance problem of handoff Mechanism in wireless network,three kinds of handover scheme is proposed:time-based virtual handoff,localized cluster handoff and overlay handoff scheme.The first method uses a timer to start handoff between a mobile node and a head node.Second methods take the network into clusters,and only cluster heads participate in the handovcr process so as to minimize the control load and maintain the topology and connectivity through the leaf nodes.The overlay structure in third methods is fully responsible for handoff start,reducing the number of handoff process near the related network.The experimental results show that,the three methods can realize network handoff well in the network with roaming mobile nodes.Among them,when base station coverage area is small,localized cluster handoffscheme can obtain optimal handoff success rate and delay while localized cluster handoff obtains optimal packet delivery ratio.
出处
《微型电脑应用》
2015年第8期37-41,5,共5页
Microcomputer Applications
