The Scheduling Policy with Two Thresholds for an ATM Multiplexer

• Main Authors: Jiang-Soon Wang, 王健順
• Other Authors: Jean-Lien C. Wu
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/72116396797385042644

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.