earticle

영어

The paper aims to investigate the performance of the TCP variants in MANET and its behavior with respect to different routing protocols. In the performance evaluation two different routing protocols On-Demand Distance Vector (AODV) and Optimized Link State Routing (OLSR) have been considered with three different TCP variants Tahoe, Reno and New-Reno. Different scenarios that can achieve scalability, mobility and http traffic loading investigation in MANET have been considered in the evaluation. Depending on the variables delay and throughput the performances parameters of the routing protocols are graded. Conclusions are drawn based on the evaluation results using OPNET simulator. The results clearly show that the both AODV and OLSR achieve acceptable performance. However, the merits of AODV over OLSR or vise versa depend on the network environment such as TCP variant used, traffic load, number of nodes and mobile speed together with the required parameter in the evaluation delay or the throughput. The results clearly demonstrate that the AODV and OLSR achieve the same performance under low http traffic, small size network and low mobile speed. However, as the network size increases the OLSR achieves higher throughput whereas AODV achieves lower delay. The effect of Taho, Reno and New-Reno is small compared with the effect of routing protocol. Thus the paper recommends the use of expert system that can choose the optimum routing protocol for the required condition.