MANET下自适应的服务发现系统研究

Research on an Adaptive Service Discovery System for MANETs

MANET环境下的服务发现系统需要面对节点可能频繁移动位置、节点新加入或离开网络,以及服务提供者可能主动撤销服务,因此应在上述情况下以合理的代价发现可用的服务。为了提高系统的自适应性,服务发现系统SCN4M-DL采用了无目录服务器结构。与底层地理路由协议耦合,设计和实现了基于圆环的服务注册和发现机制。SCN4M-DL能获得较高的发现请求的成功率,有效控制存储开销和网络负载。实验结果表明,SCN4M-DL对于MANET特性以及服务状态的改变具有良好的自适应性。

Service discovery systems over MANETs have to face node＇s frequently movement, random joining or leaving, and services revoked by their owners, therefore it is a big challenge to find available services at a reasonable cost. In order to meet above challenges and improve the adaptability of the system, we proposed a system SCN4M-DL, which adopts directory-less architecture. Coupling with underlying geographical routing algorithm, we designed and implemented a ring-based service register and disco,Cery mechanism, which leads to high success rates of discovery request and also can efficiently control memory costs and network traffic. The experimental results show that SCN4M-DL can adapt well to MANETs＇ characteristics and the changes of service states.