TPSR: Transmission Power Based Source Routing Protocol for Mobile Ad Hoc Networks with Unidirectional Links

In ad-hoc networks, a communication link between two mobile computers is not always bi-directional, i.e. uni-directional, since transmission power of mobile computers are not the same. Though some ad-hoc routing protocols, e.g. Extended DSR (Dynamic Source Routing), support routing with unidirectional links, multiple flooding RREP are used and communication overhead is high. This paper proposes a new ad-hoc routing protocol TPSR (Transmission Power based Routing Protocol) that supports unidirectional links in mobile ad-hoc networks. In our protocol, we use information of transmission power of each node to detect the existence of unidirectional links and to transmit single unicast RREP. Our protocol shows better performance in terms of the number of required messages than extended DSR in such environments as having unidirectional links.