| Summary: | 碩士 === 國立臺灣大學 === 電機工程學系研究所 === 86 === Due to the inherent advantages and the emerging technology of the communic
ation satellite, the concept of broadband satellite network (BSN) has become t
he most potential network of global communications. We first discuss the s
cheduling of downlink flows on the multibeam onboard processing satellite. In
our model, the transponder can hop among zones with a little walk time which s
hould be taken into consideration. We use MMPP model to analyze the performanc
e of FCFS scheme and also to give an approximate solution of mean delay. Then
the performance of some round-robin schemes are also analyzed by simulation.
We investigate the threshold congestion control scheme based upon multi-
rate server using Markov chain approach. Our analysis can be used to derive th
e cell loss probability of ABR traffic. Through numerical analysis, we discuss
the impact of service rate fluctuation on the performance of the congestion c
ontrol. A new method for congestion control of ABR traffic in BSN is propos
ed and its performance is examined by a simulation model. The results show tha
t we can not only enhance the link utilization, but also reduce the number of
feedback control signals. Besides, in our centralized controlled satellite com
munication system, fairness can be easily achieved among all ABR connections.
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