CONNECTION ADMISSION CONTROL CAC FOR A PACKET LEVEL SERVICE IN A SERVICE DIFFERENTIATION LOW EARTH ORBIT LEO CONTEXT

摘要

The Up/Down Link UDL of a Low Earth Orbit LEO satellite constellation is a scarce resource that needs to be shared efficiently between different users with differentiated needs. It is therefore important to handle the resource allocation RA scheme appropriately. In order to realize the best utilization efficiency of the radio resource, in this paper, a packet level service is considered with three service classes. The highest priority class is the voice class, with very stringent requirements over the delay and over the bandwidth. Two data classes are considered, the higher priority one requires certain guarantees and is used to model interactive data, while the other, Best Effort BE, has no guarantees requirements. The scheduling mechanism applied is the simple priority discipline. ON/OFF sources are considered. For the analytical model, their aggregation for the voice class is assumed to follow a two state Markov Modulated Poisson Process MMPP-2 model. Access to the channel is structured in frames. The analytical model solved for the voice class service is that of an MMPP/D/K queue. Analytical and simulation results are shown to coincide, before simulation is used to investigate the limits for the connection admission control CAC algorithm.