Low Latency, Low Loss, Scalable Throughput (L4S) Internet Service: Architecture
draft-briscoe-tsvwg-l4s-arch-02

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Last updated 2017-03-30
Replaces draft-briscoe-tsvwg-aqm-tcpm-rmcat-l4s-problem
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Transport Area Working Group                             B. Briscoe, Ed.
Internet-Draft                                       Simula Research Lab
Intended status: Informational                            K. De Schepper
Expires: October 1, 2017                                 Nokia Bell Labs
                                                        M. Bagnulo Braun
                                        Universidad Carlos III de Madrid
                                                          March 30, 2017

   Low Latency, Low Loss, Scalable Throughput (L4S) Internet Service:
                              Architecture
                    draft-briscoe-tsvwg-l4s-arch-02

Abstract

   This document describes the L4S architecture for the provision of a
   new service that the Internet could provide to eventually replace
   best efforts for all traffic: Low Latency, Low Loss, Scalable
   throughput (L4S).  It is becoming common for _all_ (or most)
   applications being run by a user at any one time to require low
   latency.  However, the only solution the IETF can offer for ultra-low
   queuing delay is Diffserv, which only favours a minority of packets
   at the expense of others.  In extensive testing the new L4S service
   keeps average queuing delay under a millisecond for _all_
   applications even under very heavy load, without sacrificing
   utilization; and it keeps congestion loss to zero.  It is becoming
   widely recognized that adding more access capacity gives diminishing
   returns, because latency is becoming the critical problem.  Even with
   a high capacity broadband access, the reduced latency of L4S
   remarkably and consistently improves performance under load for
   applications such as interactive video, conversational video, voice,
   Web, gaming, instant messaging, remote desktop and cloud-based apps
   (even when all being used at once over the same access link).  The
   insight is that the root cause of queuing delay is in TCP, not in the
   queue.  By fixing the sending TCP (and other transports) queuing
   latency becomes so much better than today that operators will want to
   deploy the network part of L4S to enable new products and services.
   Further, the network part is simple to deploy - incrementally with
   zero-config.  Both parts, sender and network, ensure coexistence with
   other legacy traffic.  At the same time L4S solves the long-
   recognized problem with the future scalability of TCP throughput.

   This document describes the L4S architecture, briefly describing the
   different components and how the work together to provide the
   aforementioned enhanced Internet service.

Briscoe, et al.          Expires October 1, 2017                [Page 1]
Internet-Draft              L4S Architecture                  March 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  L4S architecture overview . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  L4S architecture components . . . . . . . . . . . . . . . . .   7
   5.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Why These Primary Components? . . . . . . . . . . . . . .   9
     5.2.  Why Not Alternative Approaches? . . . . . . . . . . . . .  10
   6.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .  12
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