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Efficient CellLoss Ratio Estimation for RealTime CAC Decisions
Masaki AIDA Teruyuki KUBO
Publication
IEICE TRANSACTIONS on Communications
Vol.E79B
No.2
pp.108115 Publication Date: 1996/02/25
Online ISSN:
DOI:
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Communication Networks and Services Keyword: ATM, CAC, cellloss raito, nonparametric approach,
Full Text: PDF>>
Summary:
In ATM networks Connection Admission Control (CAC) is a key part of traffic control but several challenging problems still remain. One is how to assign sufficient bandwidth fast enough to achieve realtime CAC. Although solutions to the bandwidth assignment problem have been proposed, they require a lot of calculations depending on the number of VCs and on the number of different VC types. Therefore, it is difficult to apply these solutions to realtime CAC decisions, This paper presents a cellloss ratio evaluation algorithm that takes the peak and the average cell rates as inputs, and providers the upperbound of the cellloss ratio. The most remarkable characteristic of this algorithm is that it does not require exhaustive calculation and its calculation load is independent of the number of VCs and the number of different VC types. Using this approximation, we propose a realtime CAC. The experimental results show that call processing of the proposed CAC using a processor, whose pertormance is almost the same as that of a processor in a conventional PBX, terminates within several milliseconds.

