Active Queue Management (AQM) Based on Proportional Integral Controller Enhanced PIE) for Data-Over-Cable Service Interface Specifications (DOCSIS) Cable Modems (RFC8034)
Original Publication Date: 2017-Feb-01
Included in the Prior Art Database: 2017-Mar-01
Internet Society Requests For Comment (RFCs)
G. White: AUTHOR [+1]
A recent resurgence of interest in active queue management, arising from a recognition of the inadequacies of drop-tail queuing in the presence of loss-based congestion control algorithms, has resulted in the development of new algorithms that appear to provide very good congestion feedback to current TCP algorithms, while also having operational simplicity and low complexity. One of these algorithms has been selected as a requirement for cable modems built according to the DOCSIS 3.1 specification [DOCSIS_3.1]. The Data-Over-Cable Service Interface Specifications (DOCSIS) define the broadband technology deployed worldwide for Ethernet and IP service over hybrid fiber-coaxial cable systems. The most recent revision of the DOCSIS technology, version 3.1, was originally published in October 2013 and provides support for up to 10 Gbps downstream (toward the customer) and 1 Gbps upstream (from the customer) capacity over existing cable networks. Previous versions of the DOCSIS technology did not contain requirements for AQM. This document outlines the high-level AQM requirements for DOCSIS systems, discusses some of the salient features of the DOCSIS Media Access Control (MAC) layer, and describes the DOCSIS-PIE algorithm -- largely by comparing it to its progenitor, the PIE algorithm [RFC8033].
Internet Engineering Task Force (IETF) G. White Request for Comments: 8034 CableLabs Category: Informational R. Pan ISSN: 2070-1721 Cisco Systems February 2017
Active Queue Management (AQM) Based on Proportional Integral Controller Enhanced (PIE) for Data-Over-Cable Service Interface Specifications (DOCSIS) Cable Modems
Cable modems based on Data-Over-Cable Service Interface
Specifications (DOCSIS) provide broadband Internet access to over one
hundred million users worldwide. In some cases, the cable modem
connection is the bottleneck (lowest speed) link between the customer
and the Internet. As a result, the impact of buffering and
bufferbloat in the cable modem can have a significant effect on user
experience. The CableLabs DOCSIS 3.1 specification introduces
requirements for cable modems to support an Active Queue Management
(AQM) algorithm that is intended to alleviate the impact that
buffering has on latency-sensitive traffic, while preserving bulk
throughput performance. In addition, the CableLabs DOCSIS 3.0
specifications have also been amended to contain similar
requirements. This document describes the requirements on AQM that
apply to DOCSIS equipment, including a description of the
"DOCSIS-PIE" algorithm that is required on DOCSIS 3.1 cable modems.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 7841.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc8034.
White & Pan Informational [Page 1]
RFC 8034 PIE-Based AQM for DOCSIS Cable Modems February 2017
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