Study Based On The Network Simulator, V2 Mobile Ad Hoc Networks

The mobile Ad hoc network (MANET) is a temporary network established by the users with wireless interfaces. It operates without any aid of the preexisting infrastraucture. Each node in MANET acts as both terminal and router, which collects routes and forwards packets. It is an extreme challenge research subject for such network due to the dynamical topology change, bandwidth limitation and power constraint.The state-of-the-art of the MANET technology in 5 layer: physical Layer, MAC layer protocols, routing protocols, transport protocol and application and middle ware issuses are summarized in this thesis. Five typical Routing protocols DSDV, DSR, TORA, AODV and ZRP are studied .The implementation and analysis of MANET are hard to achieve, while computer simulation seems to be viable.The characters of 3 popular Network Simulators OPNET, GloMoSim and Network Simulator V2, are introduced and compared. NS-2 is a free and open source software, the simulation deSign method and procudure based on NS-2 are summarized .Routing protocols is a hot research area in MANET. In this thesis, we evaluate 4 routing protocols, DSDV , DSR, TORA and AODV for MANET based on NS-2. Performance of each routing protocols is evaluated with respect to fraction of packets delivered, end-to-end delay and routing load for given traffics and mobility models. Both small size (20 nodes) and medium size (50 nodes) networks are used. It is observed that the reative routing protocols use much lower routing load. However, the proactive protocols have better end-to-end delay performamce.