A Priority Buffer Management Scheme for QOS Improvement in ATM Network

• Main Authors: Jui-Chi Chen, 陳瑞奇
• Other Authors: Yaw-Chung Chen
• Format: Others
• Language: en_US
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/15662623740229501647

碩士 === 國立交通大學 === 資訊工程研究所 === 83 === Broadband Integrated Services Digital Network (B-ISDN) is expected to efficiently support multi-media information transfer in which each medium has its own grade of service (GOS) require- ments. The asynchronous transfer mode (ATM) is the key technology. When designing the output buffer in an ATM switch, the supporting to different kind of QOS for multiple classes should be considered. We propose a new buffering scheme to maintain the different kind of QOS for multiple classes with finite resource (buffer) and to provide the higher priority class with the better service under fair condition. The proposed scheme consists of an intelligent buffer management method to adjust a maximum queue size and a protective threshold for each class dynamically by monitoring the cell loss rate of each class, and a service discipline called Earliest Expected Due- time First (EEDF) to gain a better cell delay quality for each class individually by using a due time concept [5]. Assuming that ATM transmission rate of 155.52 Mb/s is considered as EEDF service rate of simulation. And we use the burst-silence traffic model for simulating the source. Comparisons are made for QOS among a single FIFO buffering scheme, a fixed-length separate queue buffering scheme, and our proposed priority buffer management scheme. Our proposed scheme is the best one if we consider the fairness and achievability of QOS of all classes.