"Worst Case Buffer Requirements for TCP over ABR," ATM Forum/97-0617, July 1997

We extend our earlier study on the buffer requirement problem for TCP over ABR. Here, a worst case scenario is generated such that TCP sources send a burst of data under the conditions when the sources have high congestion window the ACR (allowed cell rate) rate for ABR is high. We find that ABR using ERICA+ switch algorithm can maintain the queue lengths (hence the buffer requirements) bounded even for the worst case for a reasonable number of sources. We present analytical arguments for the expected queue length and simulation results for varying number of sources and parameter values.

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