Received power threshold and reply timing controlled reactive routing scheme for reliable ad hoc network

Most of reactive ad hoc routing schemes establish a route by using route request (RREQ) and route reply (RREP) messages. In actual wireless environments, however, route construction with this method is not always successful, nor is the established route stable. This paper analyses two issues that prevent stable route establishment. They are the packet collision of RREQ/RREP and the decrease of channel correlation between RREQ/RREP. In order to overcome these problems, an improved reactive routing scheme is proposed that employs received threshold and reply timing control. The route construction performance for the proposed scheme is evaluated by network simulation. The simulated results show that the proposed scheme can improve route construction probability under fading environment with a small increase of route construction delay.