Recursive retransmission control for a two-station slotted-Aloha network

A first-order recursive retransmission control policy for a two-station slotted-Aloha network is presented. Under this policy, terminals adjust their retransmission probability at the end of each slot based on feedback from the current slot. The fundamental difference between a single-station and a two-station network (packet radio) is the interaction between the terminal groups, which occurs because some terminals are in transmission range of both stations, resulting in interference. Retransmission control keeps the offered traffic levels near the maximum throughput point and divides the channel capacity fairly between the two terminal groups. The control is intuitively appealing: to acquire channel capacity in proportion to its arrival rate, each group balances efforts to increase its throughput with a certain backoff that permits channel use by the other group