Message-by-Message Route Modification in Wireless Multihop Transmission for Shorter Delay

In a mobile ad-hoc network, network topology changes dynamically due to mobility of computers, battery consumption and failure of mobile computers. Until now, many ad- hoc routing protocol tolerating such changes of network topology have been proposed. Here, all data messages are forwarded by all mobile computers included in a message transmission route detected by an ad-hoc routing protocol. No intermediate mobile computers are added and removed other than in route repair and switching. This paper proposes a dynamic modification of a message transmission route for achieving shorter end-to- end transmission delay with less control messages in an ad- hoc network. Here, data messages are retransmitted not by a previous hop mobile computer but by another mobile computer which receives them correctly and is the nearest to a next hop mobile computer. This paper shows a routing protocol and a data message transmission protocol for the dynamic route modification according to the surrogate of retransmission. Performance evaluation is simulation shows that own proposal method achieves reduction of numbers of retransmission i.e., shorter end-to-end transmission delay, especially in a dense ad- hoc network.