Abstract: In wireless communication networks with distributed medium access control, maximal network throughput is achieved as a compromise between medium contention duration and collision rate. Maximal throughput in self-adapting medium access protocol is achieved by stations maintaining backoff counter BC and freezing counter FC, which define the state in two-dimensional state space. Countdown process is comprised of decrementing BC in idle timeslots, and incrementing FC in busy timeslots. Countdown ends if the value of BC reaches zero, when the station starts to transmit data, or when FC is incremented to be greater than freezing limit FL. In both cases, the station has to randomly select new backoff counter, reset its freezing counter, and continue to count down with these new values of BC and FC.

Abstract: In packet switching telecommunications networks, flow control is used to obtain optimal network working point, regulating the transmitter packet sending rate. The state of overload (congestion) or underutilization of the network can be detected explicitly using signalling from network nodes, or implicitly using number of packet (window W) and round trip time (T) measurements. The Window-Time-Space Flow Control, WTFC is a method of determining the belonging part of network capacity, optimal packet sending rate and optimal window, based on the measured W,T point in the window-time space and knowledge about total network capacity W0,T0. In this way, devices with WTFC, nodes and terminals, keep optimal network working point near the on average empty queues mode of operation. With networks utilizing WTFC, nodes can signal network parameters at connection establishment only. After that, all WTFC processing is done by terminal packet transmitter.