A heterogeneous theoretical framework for the analysis of delay tolerant networks

In this paper, we first present a heterogeneous theoretical framework for DTNs where the contact between nodes is based on independent differently distributed assumption. Moreover, the message forwarding process follows a Gamma Distribution. Then, we propose a new spray routing scheme based on this framework. Moreover, we compare our routing protocol with traditional spray routing (TSR) protocols and epidemic (EP) routing scheme on the ONE simulator with both real dataset of Infocom06 and scenario of Working Day Movement Model. Simulation results show that our scheme is significantly better than TSR and EP in the following four aspects: average number of copies, average number of hop counts, average delivery latency and delivery rate.