Analysis of a multiaccess/switching technique for multibeam satellites in a prioritized ISDN environment

An integrated multibeam satellite system with a new multiple access technique and an on-board baseband switch with priority rule is analyzed. The performance analysis includes the computation of the various packet loss, call locking, and packet delays of a typical user in an integrated satellite internetworking environment. The uplink technique employed is a hybrid packet/circuit switched approach of the Demand Assignment type, while the down link is a Time Division Multiplexing technique. On board the satellite, a baseband nonblocking switch is employed to route packets from input to output ports. Various amounts of input and output buffering as well as priority rules and a head of line blocking resolution algorithm are employed to improve the performance of the data services without affecting other services performance. The delay and throughput characteristics of the services are determined by examining the relationships between the head of line resolution, buffer sizes, and internal speedup ratio of the baseband switch