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Evaluation of Policing Mechanisms for ATM Networks
IEICE TRANSACTIONS on Communications
Publication Date: 1993/11/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Switching and Communication Processing
ATM, B-ISDN, traffic control, UPC, policing,
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To realize Broadband ISDN, which provides multi-media services, ATM (Asynchronous Transfer Mode) has been standardized by CCITT and the development of the system is accelerating towards the 21st century. The packet-oriented information transfer based on fixed size blocks called cells provides a very flexible allocation of transmission capacity to different connections. On the other hand, to ensure the QoS (Quality of Service) for all established connections it is necessary to monitor and regulate the input traffic from each user based on usage parameters which are negotiated between user and network at connection set-up, i.e., a policing function is required. In this paper some requirements for a policing function will be given. Accuracy of the policing decision for violating and well-behaving sources, tolerance with respect to cell delay variation (CDV) which is caused by multiplexing functions between the source terminal and the policing device, time to detect arriving violating cells, implementation complexity, and amount, i.e., cost effectiveness, are discussed mainly. We present simulation results for five policing mechanisms, Leaky Bucket (LB), Jumping Window (JW), and Moving Window (MW) which have been already well-known, Pseudo Jumping Window (PJW), and Pseudo Moving Window (PMW) which are proposed mechanisms. PJM and PMW mechanisms required a pseudo cell buffer with finite queueing capacity to the corresponding JW and MW mechanisms, respectively. These two mechanisms can be expected as advanced methods from view points of the accuracy of the policing for long-term fluctuated compliant source, fast reaction ability and restrictness to long burst traffic comparing with the above existing methods. We compare the five mechanisms based on the above requirements and show that the PJW and the LB are the most effective mechanisms for mean rate policing in ATM networks.