exploiting multihop diversity through efficient localized searching with cdma and route metric-based power control
Wireless links a subject to large deviations in quality. While such deviations may result in the failure of routes, it also means that some routes may be substantially better than others. In order to utilize these routes, the routing protocol must find these good routes. This paper presents a method for locally searching for routes. Specifically, through passive overhearing of data packets, nodes determine which control packets they should forward. Furthermore, nodes use CDMA with route metric-based power control in order to allow multiple nodes to transmit simultaneously and yet ensure that the control packets advertising the best routes are received. Packet level simulations indicate that these techniques result in significantly better packet delivery ratio, lower delay, and far fewer route failures. For example, in one scenario examined, it was found that the techniques presented resulted in 90\% of the connections not requiring any route search after the initial route was found, whereas the other protocols were forced to perform between 4 and 25 route searches for each connection.
diversity cdma multihop wireless networks