Dynamic protocol for token ring network with unbalanced load

An attempt was made to develop a protocol, which will use both single packet and arbitrary-gated service schemes. in which the token-holding-time (THT) of a station depends on its buffer occupancy or queue length. If the buffer occupancy is less than a preassigned threshold value, the station will hold the token for only one packet service time. If the buffer occupancy is greater, then the THT will be chosen to be some optimum value that will enable the station to serve more packets. This will counteract the problem of queue build-up at the station. Consequently, the mean waiting time of a packet at a station, to which the arrival rate is greater, can be reduced even though the overall mean waiting time of packets in other buffers increases slightly. To find this threshold limit and an optimum value of TNT for the token ring protocol under unbalanced load situations, simulation studies were done and the results are presented