Active queue management in DOCSIS 3.1 networks


An vital new feature within the DOCSIS 3.1 specification is active queue management (AQM). AQM provides a solution to the matter of providing good application layer quality of expertise when multiple applications share a network connection. The requirement for AQM arises due to the presence of packet buffering in network elements and also the mechanics of the TCP congestion avoidance algorithm. Based mostly on simulated performance and implementation considerations, a variant of the Proportional Integral Controller Enhanced (PIE) algorithm, called DOCSIS-PIE, is now included in DOCSIS and has recently been added to the DOCSIS three.0 specification yet. Implementation of DOCSIS-PIE is mandatory for implementation in DOCSIS cable modems, and recommended for implementation in DOCSIS three.0 cable modems. In addition to the mandatory/ counseled algorithm, DOCSIS and cable modem vendors are free to support extra AQM algorithms of their choosing. For managing downstream traffic, the DOCSIS specification mandates that the CMTS support an AQM technology, however does not need a specific algorithm. This article discusses the underlying downside that is addressed by AQM, the selection of DOCSIS-PIE because the algorithm of selection for DOCSIS three.1 cable modems, and therefore the expected performance of the algorithm in simulated network conditions.

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