There are many issues that limit the
performance of wireless mobile
multi-hop ad hoc networks (MANETs). One of them
is that TCP is not well
adapted to networks where routes can change or disappear often. In this
paper the behaviour of a standard TCP
implementation is studied in
situations typical for MANETs and compared to the behaviour of a
partial implementation of a ATCP, a TCP modification that is intended
to increase
performance in MANETs. Simulations with simple scenarios
show that TCP easily creates a full network load which causes send
failures and decreased throughput performance. In some cases the
partial ATCP implementation increases throughput but more often it
causes an increased amount of duplicate retransmissions. In these
scenarios it is unlikely that even a complete ATCP implementation would
increase throughput performance. A few modifications to ATCP and TCP
are analysed. Especially a limit of the congestion window size shows a
large throughput increase. The results are inconclusive, the
simulations are too simple to show if the results are applicable in
more complex scenarios. It is not clear if ATCP actually is useful in a
MANET.