Cache management method based on numbers of message replications and comprehensive effectiveness in opportunistic network

The invention relates to a design method of efficient cache management strategy in opportunistic network. The cache management method includes creating a list of message transmission path sustained by each node to calculate numbers of message replications, and creating a network performance comprehensive evaluation index, namely comprehensive effectiveness, according to general delivery rate, general transmission delay and general network overhead, so as to solve the problems that cache sources of nodes are limited in opportunistic network, each message replication carried by the nodes rapidly saturates nodes cache to discontinue storing follow-up message replications and to lead to low delivery rate of network messages and longer general message transmission delay. By the cache management method, message replications in cache are sequenced according to the degree of comprehensive effectiveness, proportions of general delivery rate, general transmission delay and general network overhead of in comprehensive e