Improve TCP Performance with Link-Aware Warning Method in Mobile Ad Hoc Networks

Along with the reactive routing algorithms of mobile ad hoc network (MANET), preemptive routing is a patch method which tries to warn the source node and to tell it to change route in time before a link is about to break Preemptive method was proposed to decrease packet losses and improve TCP performance in MANET. However, the precision of warning occasion is an important problem, and affects TCP performance greatly. In this paper, with an improved link status evaluation technique, we present a LAW (Link-Aware Warning)-Routing method to improve the preemptive routing by increasing the precision of warning. We also choose an appropriate Reaction Time, which is an important factor in route warning occasion, according to our LAW-Routing function. The simulation result shows that the new method can improve the performance of routing and TCP greatly, especially in high-mobility scenarios.