ＡＴＭ網路中不同等級指派週期及排班法則

Abstract

非同步傳送模式(ＡＴＭ)網路可提供多媒體服務, 以傳送多樣化的訊務, 諸如: 文件, 影像, 聲音, 視訊等. 這些訊務所要求的服務(QOS)各有不 同, 如何保證服務品質並能兼顧鏈路使用效率是很重要的課題, 此處所指 的服務品質主要是以最大延遲時間與封胞遺失率來衡量.為瞭解ＡＴＭ網 路中流量控制的處理方式, 本論文特闢一章專門探討流量控制原理.本論 文所提服務品質控制是採用不同等級指派控制方法, 來保證服務品質並改 善鏈路使用效率. 在固定各種訊務最大延遲時間條件下, 探討不同指派週 期p 對於封胞遺失率之影響, 並提出黃金分割比排班法則, 作為不同等級 的時槽排班法則, 是本論文主要的研究範圍. The asynchronous transfer mode (ATM) network will provide a wide range of multimedia services with diversified traffic flow; such as text, image, voice and video etc. As the QOS requirements of these traffic type are all different, it is an important subject how to quarantee the QOS and promote the link utilization, where the QOS is mainly measured in maximum delay time and maximum cell lose rate. The thesis develops a chapter to survey the principle of flow control and to understand the processing scheme of flow control in ATM network. Besides, a QOS control method named priority assignment control scheme is presented, and it is used to quarantee the QOS and to improve the link utilization. Under a required condition of maximum delay time for various traffic type, the effect of different priority assignment period on the cell lose probability is the major studing scope in the thesus and finally a method for priority scheduling in each cell slot named golden ratio scheduling scheme is developed.