Three important efficiecy measures for inbound multiple access protocols which can be shared by many contending users, used in the VSAT satellite networks are : 1) Throughput, the fraction of time useful traffic si carried on the multiaccess channel. 2) Delay characteristics, the time distributions which is spent to be correctly received by the destination terminals and 3) Stability properties, relating to the possibility of undesirable congestion modes. In this thesis, we propose the real time optimal decision making procedures and the optimal channel operational policies for multiaccess channels in consideration of the channel efficiency measures mentioned above. We also propose the optimal load control mechanisms for the VSAT system applicable to the environments where the load placed upon the system is time varying, i.e., high load fluctuation. Simulation has been performed to supprot the proposed mechanisms through the existing system. Simulation results show that the proposed mechanisms have performed well for the throughput and delay characteristics regardless of dynamic changes of system load.
