New bandwidth-control design: policer for probable packet discard (PPPD)

A new bandwidth-control design - called policer for packet probable discard (PPPD) - has been developed. This not only limits the bandwidth of each user to a policing bandwidth, but also achieves TCP throughputs equal to the policing bandwidth. The proposed PPPD uses an improved leaky bucket algorithm, by which packets are discarded at a certain probability when the received bandwidth is judged to be more than the policing bandwidth. Simulations show that the proposed PPPD increases TCP throughput from 74% to 95%, or more, of the policing bandwidth.