Community-Based Adaptive Buffer Management Strategy in Opportunistic Network

Networks composed of devices, which having short-range wireless communications capabilities and carried by people, is a major application scenarios in opportunistic network, whose nodes movement has the characteristics of community. In this paper, we combine nodes meeting frequency with nodes separation duration time to assign nodes to communities, and present a community-based self-adaptive buffer management strategy in opportunistic network. The strategy makes decisions of buffered messages discarding and message transmission scheduling based on nodes' community attribute. At the same time, it generates message feedback adaptively according to the message delivery status, to remove unnecessary redundancy copies of messages in nodes buffer timely, then to reduce buffer overflow and avoid many unnecessary messages transmission. Simulation results show that the strategy can effectively improve the message delivery ratio and has significant lower network overhead.