Comparison of TCP Reno and Vegas in wireless mobile ad hoc networks

We investigate and evaluate the performance of these two TCP variants in a wireless mobile ad hoc network. The results in this paper are based on simulations using the NS2 network simulator from Lawrence Berkeley National Laboratory (LBNL), with extensions from the MONARCH project at Carnegie Mellon. We present our experimental results in two parts. The first part of the experiments does not include node movement. The effect of mobility and the link breakage are considered in the second part experiments. We consider one type of topology in the first part experiments: a string topology with 8 nodes as shown. The distance between any two-neighbor nodes is equal to 200 m, which lets a node can only connect to its neighbor node. In other words, only those nodes between which a line exists can directly communicate. In this performance study, we set up a single TCP connection between a chosen pair of sender and receiver nodes and measured the successively received packets over the lifetime of the connection. The TCP good-put result was measured for each connection, averaged over ten runs. We compare these two TCP variants and discuss the effect of TCP maximum window size window.