一种跨层服务发现协议的设计与仿真分析

Design and Emulation Analysis of Cross-layer Service Discovery Protocol

一般认为,服务发现协议用于解决设备间的相互发现及网络服务的自动获取。对于网络可靠性差,节点移动性大的AdHoc网络而言,服务的自动发现至关重要,但由此带来的通讯开销和请求时延也相当显著。为此,提出了一种基于混合区域路由协议ZRP的跨层服务发现协议--CZRP。该协议通过将服务发现机制与网络层ZRP路由机制相结合,利用ZRP的混合路由及BRP广播机制,添加服务加入、查询、选择、删除等机制,可在开销较低的条件下完成服务的自动发现。仿真结果表明,在移动AdHoc网络环境下,CZRP可较大地降低网络通讯开销和服务请求延迟。

Service discovery is important for Ad Hoc network which have worse reliability and change frequently, since it is generally considered that it can discover terminal units, attain network services, but its overload and request delay are serious problem o So a ZRP-based cross-designed service discovery protocol was proposed. Particularly, ZRP is zone routing protocol combined proactive and reactive mode for Ad Hoc network. The new protocol integrates service discovery in the application layer into ZRP route mechanism in the network layer, using existent ZRP route traffic and BRP transmission mechanism to transmit service request and advertisement, and adding service join, query, select, delete and other new mechanism, so that it can save much network communication overhead. The simulation result shows that CZRP can greatly reduce network communication overhead and service request delay in mobile Ad Hoc network.