Bit stream based connection admission control system

Details Bit stream based connection admission control system Bit stream based connection admission control system

1996-08-23

1999-03-23

Patel, Ajit

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

370412, H04J 116, H04J 314

Patent

active

058869808

ABSTRACT:
In a cell switched network such as an ATM network, a connection admission ntrol system is provided to establish connections which guarantee user requested end-to-end cell transmission delay bounds. The subject system uses, a bit stream approach to model the worst case cell generation pattern of a connection and provides mechanisms to construct new bit streams after the original ones are delayed, multiplexed, demultiplexed, or filtered within a network. Given arriving bit streams at a queueing point, a system is provided to obtain the worst-case cell queueing delay which is used to check if a connection can be established with the requested delay bounds. In one embodiment, the subject system uses the CBR/VBR traffic models as defined in the ATM Forum Traffic Management Specification Version 4.0 to derive the worst-case bit stream for a connection and calculates the worst case queueing delay based on the conventional static priority First In First Out, or FIFO, cell transmission scheduling at switches. The subject invention provides a simple and efficient way to support real-time CBR/VBR services as defined by the ATM Forum over existing ATM networks without requiring a sophisticated cell transmission scheduling mechanism at switches.

REFERENCES:
patent: 4984264 (1991-01-01), Katsube
patent: 5050161 (1991-09-01), Godestani
patent: 5267232 (1993-11-01), Katsube et al.
patent: 5274644 (1993-12-01), Berger et al.
patent: 5392280 (1995-02-01), Zheng

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