CAC (Connection Admission Control) is one of the most important functions in ATM networks to provide variousrequested QoSfrom end users. CAC mechanisms for sop guarantee which assure the requested QoS statistically are classlfed to a non-parametric or a parametric approach. However both approaches have some disadvantages. The non-parametric approach needs the dedicated hardware to monitor actual traflc streams. Generally, the parametric approach must invoke the complicaFed calCulations to analyze mathematical models. This paper propsses a simplified CAC mechanism referred to as UL-CAC (Ultra Light weight CAC) for soft guqrpntee. Although this mechanism is included in a category of the parametric approach, it does not need complicated calculation. This paper presents its mechanism which is applied to VBR traffic streams characterized by the dual leaky bucket mechanism and is applied to CBR traflc streams. It also verifies suitability by sorpe simulations.
In real time communications on LAN such as FDDI utilizing the synchronous class of Timed Token Protocol (TTP), there exists a problem that the transmission delay time of synchronous data with Poisson arrivals at LAN nodes from upper layer largely increase in the range that the average load of synchronous data is close to the synchronous bandwidth. It is caused by the fact that TTP has not a function to process excess data that arrive at LAN nodes earlier than the timing determined with pre-assigned synchronous bandwidthIn this paper, in order to solve the problem, we propose another data transfer protocol" Advanced Timed Token Protocol (ATTP)" of which data transfer mechanism is modified from TTP and improves the transmission delay time of synchronous data including above mentioned excess data by rotating token more quickly on LAN than TTP. Furthermore we show the effectiveness of the protocol by simulations on the model of time critical communication for manufacturing control system.
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