The DDTCI switch algorithm for ABR traffic control in ATM networks |
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Authors: | Zhaoyi Lu Yuxin Ning |
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Affiliation: | Info. Engineering College, Qingdao University, Qingdao 266071, China |
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Abstract: | For the issue of flow control for Available Bit Rate (ABR) traffic in ATM network, a new improved Explicit Rate (ER) algorithm named Dynamic Double Threshold Congestion Indication (DDTCI) algorithm is presented based on the Explicit Forward Congestion Indication (EFCI) Current Cell Rate (CCR) algorithm and Relative Rate (RR) algorithm. Different from the early ER algorithm, both the high-level and the low-level threshold is dynamically changing according to the state of the bottleneck node. We determinate the congestion state with the information of the two dynamic threshold, and control the cell rate of the source by feed back mechanism. Except for the well performance in both link utilization and fairness in distribution of available bandwidth, the improved algorithm can alleviate the fluctuation of sending rate dramatically. The mechanism is modeled by a fluid model, and the useful expressions are derived. Simulation results show up our conclusion. |
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Keywords: | ATM Available Bit Rate (ABR) Dynamic threshold Fluid model |
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