Local queue in single link packet switched networks with variable packet lengths

摘要

To decrease the packet rejection rate, we give new rules of buffer dimensioning in single link packet switched networks when packet lengths are highly varying, needing the use of a new "double faced" traffic model. For a low bit rate and a possible high rejection rate, the tandem queue effect with the derived agglutination phenomenon can appear in case of upstream link overload, where packets (including "premature departures") become indistinguishable. The buffer capacity has to be higher than the maximum agglutination size, depending on the packet length variation but not on the load (case of Intelligent Networks). In case of broadband transmission and a wanted very low packet rejection rate (case of IP-based Networks), the upstream correlations disappear with "premature departures" which unveil the classical local M/G/1 queue (without any existence of distinguishable local traffic sources) leading to overdimension the buffer in a great extent at heavy load, due to the increasing size of the busy period.