TAILIEUCHUNG - Mạng lưới giao thông và đánh giá hiệu suất P16

The traditional role of traf®c engineering is to ensure that a telecommunications network has just enough capacity to meet expected demand with adequate quality of service. A critical requirement is to understand the three-way relationship between demand, capacity, and performance, each of these being quanti®ed in appropriate units. The degree to which this is possible in a future multiservice network remains uncertain, due notably to the inherent self-similarity of traf®c and the modeling dif®culty that this implies. The purpose of the present chapter is to argue that sound traf®c engineering remains the crucial element in providing quality of. | Self-Similar Network Traffic and Performance Evaluation Edited by Kihong Park and Walter Willinger Copyright 2000 by John Wiley Sons Inc. Print ISBN 0-471-31974-0 Electronic ISBN 0-471-20644-X 16 ENGINEERING FOR QUALITY OF SERVICE J. W. Roberts France Télécom CNET 92794 Issy-Moulineaux Cédex 9 France INTRODUCTION The traditional role of traffic engineering is to ensure that a telecommunications network has just enough capacity to meet expected demand with adequate quality of service. A critical requirement is to understand the three-way relationship between demand capacity and performance each of these being quantified in appropriate units. The degree to which this is possible in a future multiservice network remains uncertain due notably to the inherent self-similarity of traffic and the modeling difficulty that this implies. The purpose of the present chapter is to argue that sound traffic engineering remains the crucial element in providing quality of service and that the network must be designed to circumvent the self-similarity problem by applying traffic controls at an appropriate level. Quality of service in a multiservice network depends essentially on two factors the service model that identifies different service classes and specifies how network resources are shared and the traffic engineering procedures used to determine the capacity of those resources. While the service model alone can provide differential levels of service ensuring that some users generally those who pay most have good quality to provide that quality for a predefined population of users relies on previously providing sufficient capacity to handle their demand. It is important in defining the service model to correctly identify the entity to which traffic controls apply. In a connectionless network where this entity is the datagram there is little scope for offering more than best effort quality of service 401 402 ENGINEERING FOR QUALITY OF SERVICE commitments to higher levels. At

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