To address the problem in opportunistic network that the existing epidemic-mechanism-based routing algorithms incur redundant communication overhead during the transmission of data packets

which is part of the data packets have already arrived at the destination nodes

but the data is still in the network storage and transmission

a kind of reduce buffer overhead Epidemic routing algorithm for opportunistic networks

called RBER was proposed. The algorithm based on SV information operation

to avoid redundant data takes up the cache. Theoretical analysis and simulation results show that the mechanism can reduce network overhead

redundant data packet sending and cache usage.