Cache Management Mechanism with Node Status Evaluation for Intermittently Connected Wireless Networks

Considering the limited cache resources of nodes in intermittently connected wireless networks, a cache management mechanism is proposed based on node state estimate. The direct and indirect connection status, service rate and connectivity degree between the given nodes can be evaluated in a distributed manner, according to the network state monitored during the movement. Further, the difference of service ability of each node can be determined dynamically. Furthermore, the probability of message successfully delivered by the current node and the utility for the given message can be estimated. Consequently, cache management operations are executed reasonably. Simulation results show that the proposed mechanism does not only constrain the overhead ratio effectively but also enhance the message delivery ratio, compared with other mechanisms.