Abstract:

In order to solve the problem of the low throughput of the dropfront (DF) and dropoldest (DO) in delay tolerant networks (DTN), an enhanced congestion contr ol strategy is proposed under conventional epidemic routing, that is called drop copy rate (DCR). When the congestion of node happening, the copy rates of packe ts stored in buffer and arrived at this node at the same time are calculated, ac cording to the copy numbers , the lapse time and the packet that has the highest copy rate will be deleted, and then the congestion can be relieved. Simulations indicate that DCR decreases the packet loss ratio, and improves the throughput, and relieves congestion effectively of the networks compared to DF and DO.

Key words: delay tolerant network, epidemic routing, congestion control, copy rate