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Delay-Tolerant Networks (DTNs) have emerged as an exciting research area witha number of useful applications. Most of these applications would benefitgreatly by a reduction in the message delivery delay experienced in thenetwork. The delay performance of DTNs is adversely affected by contention,especially severe in the presence of higher traffic rates and node densities.Many-to-Many (M2M) communication can handle this contention much better thantraditional one-to- one communication employing CSMA. In this paper, for thefirst time, we analytically model the expected delivery delay of a DTNemploying epidemic routing and M2M communication. The accuracy of our model isdemonstrated by matching the analytical results against those from simulations.We also show using simulations that M2M communication significantly improvesthe delay performance (with respect to one-to-one CSMA) for high contentionscenarios. We believe our work will enable the effective application of M2Mcommunication to reduce delivery delays in DTNs.

Improving DTN Routing Performance Using Many-to-Many Communication: A Performance Modeling Study