无线网拓扑发现的设计与实现

Design and Implementation of Wireless Network Topology Discover

地铁无线通信系统中,安装在列车上的无线通信设备STA(站点)随着列车的快速移动而频繁地与轨旁的AP(访问点)进行切换,因此及时、准确地发现它们之间的拓扑结构成了网络管理的一个难点.针对这个难点,本文扩展STA中SNMP代理的trap发送机制,与不同的AP关联时,STA主动向管理站报告与AP的拓扑信息,同时管理站利用AdventNet SNMP提供的API接收该拓扑信息.实验测试结果表明,该机制能及时、准确地发现AP与STA之间的拓扑结构,对地铁无线通信系统的有效管理和维护提供了重要的保障.

In the subway wireless communication system, wireless communication equipment STA installed in the train switches among AP beside the track frequently with the fast-moving train, therefore, to discovery the topology of their network timely and accurately becomes a difficult of network management. To address this difficulty, it can make the STA report the topology between AP and STA to the management station initiatively when the STA associates with different AP by extending the trap mechanism of the SNMP agent in STA, at the same time, management station receives the trap using API provided by AdventNet SNMP. Tests show that this mechanism could discover the topology between AP and STA timely and accurately, so it provides important safeguards for the effective management and maintenance of the subway wireless communication system.