SaW-Utility: a Spray and Wait Routing Protocol Based on the Utility of Nodes in DTN

Spray and wait( Sa W) routing protocols select relay node arbitrarily in message forwarding process. Aiming at the arbitrariness,a new routing protocol,Sa W-Utility,is proposed based on the utility of nodes. When messages are forwarded,Sa W-Utility selects relay nodes according to the utility of nodes,such as the sizes of remaining buffer,success rate of message delivery,and etc.,so that the arbitrariness can be overcome. The simulation results show that the proposed routing protocol significantly improves the success rate of message forwarding and reduces network overhead compared with Sa W routing protocols.