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Active Queue Management (AQM) Based on Proportional Integral Controller Enhanced PIE) for Data-Over-Cable Service Interface Specifications (DOCSIS) Cable Modems (RFC8034) Disclosure Number: IPCOM000249484D
Original Publication Date: 2017-Feb-01
Included in the Prior Art Database: 2017-Mar-01
Document File: 34 page(s) / 33K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

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].

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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

White & Pan                   Informational                     [Page 1]
 RFC 8034          PIE-Based AQM for DOCSIS Cable Modems    February 2017

 Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Do...