Performance Evaluation of Link Quality Extension in Multihop Wireless Mobile Ad-hoc Networks

Recently, mobile ad-hoc networks (MANET) are continuing to attract the attention for their potential use in several fields. Most of the work has been done in simulation, because a simulator can give a quick and inexpensive understanding of protocols and algorithms. However, experimentation in the real world are very important to verify the simulation results and to revise the models implemented in the simulator. In this paper, we present the implementation and analysis of our testbed considering the link quality window size (LQWS) parameter for optimized link state routing (OLSR) protocol. We investigate the effect of mobility in the throughput of a MANET. The mobile nodes move toward the destination at a regular speed. When the mobile nodes arrive at the corner, they stop for about three seconds. In our experiments, we consider two cases: only one node is moving (mobile node)and two nodes (intermediate nodes) are moving at the same time. We assess the performance of our testbed in terms of throughput, round trip time, jitter and packet loss. From our experiments, we found that throughput of TCP was improved by reducing LQWS.