An Adaptive Slot Allocation Scheme for Wireless ATM

R.M.R. Silveira and I.S. Bonatti (Brazil)


Wireless ATM, medium access control, multiple access, adaptive allocation, discrete event simulation and performance analysis


Multiple access protocols for wireless ATM natworks combine reservation and contention access methods to guarantee quality of service and to share the radio channel efficiently. The reserved cells are served by a scheduling scheme based in an estimate of the number of cells in the terminal buffers. The base station implements a weighted-round-robin strategy whose paramteter is obtained from the service contract connection establishment. The number of reserved cells is updated via the contention access procedure or via piggybacking. Two critical points in these systems are how the contention slots and the reservation slots are managed by the base station to efficiently use the scarce resource of the radio channel. The paper describes and evaluates, using simulation, an efficient adaptive slot allocation scheme to handle the collision among accessing terminals, to manage the number of contention slots and to allocate the reservation slots to the reserving terminals. The proposed algorithm uses a simple reward-penalty scheme that does not require a complex estimate of the number of active terminals present in the cell covered by the base station.

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