Adaptive Routing in Mobile Opportunistic Networks
In this paper, authors study how to adapt the routing according to dynamic network conditions in wireless ad hoc networks. Authors present a method that dynamically chooses routing agent between Ad hoc On-demand Distance Vector routing protocol (AODV) with TCP (endto-end transport) and Delay-Tolerant Networking (DTN) routing and bundle protocol (hop-by-hop transport). Authors use simulations to confirm that DTN routing and the bundle protocol leads to significantly shorter end-to-end delays and higher message delivery ratios than AODV and end-to-end TCP when the wireless node density is low. However, with high node density, DTN routing, especially epidemic routing, suffers from multiple bundle copies and simultaneous transmissions that lead into collisions and retransmissions at the wireless link (MAC) layer.