| Summary: | 碩士 === 國立臺灣科技大學 === 工程技術研究所 === 83 === The design and evaluation of scheduling policy for an ATM
(asynchronous transfer mode) multiplexer is becoming important
due to the advent of integrated communications networks. The
various traffic types will coexist because ATM networks
support a wide range of services. The heavy traffic will
result in service degradation for multimedia applications. To
solve the problem, an appropriate scheduling policy is
required in the ATM multiplexer to guarantee the quality of
service (QoS) for each traffic type. The arrival traffic from
subscribers to the ATM network are classified into two types:
real-time traffic and non-real-time traffic. The real-time
data has constraint on the time delay and the non-real-time
data is not sensitive to time delay but rather sensitive to
loss probability. Considering quality of service for each
traffic, the scheduling policy with two thresholds in ATM
multiplexer is proposed and studied in this thesis. In order to
describe the bursty traffic characteristics of ATM environment,
Markov Modulated Poisson Processes (MMPP) are used as arrival
processes. The MPEG (Moving Pictures Expert Group) have
developed an international video coding standard and have
been applied to a wide range of video entertainment.
Therefore, several MPEG video sources are regarded as
real-time data and we use MMPP process to model these MPEG
video sources. A modified parameter-evaluation method is
introduced and the histogram of modeling results are
presented.
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