International Journal of Information and Electronics Engineering
Opportunistic networking is a kind of communication in which hosts that compose the network must store, carry and forward a message and must keep as much messages as possible to increase the chance of sharing them to other hosts. In this kind of network, nodes update continuously their cache according to their mobility and interest. Thus deleting a message in a cache when its deadline is reached reduces the possibility of carrying and sending it to other hosts. According to some realistic scenarios, a host may be interested in content that has just been discarded from a cache.