Architectural View of E2E Latency and Gaps
draft-dunbar-e2e-latency-arch-view-and-gaps-02

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Network working group                                      L. Dunbar
Internet Draft                                                Huawei
Category: Informational
Expires: November 2019
                                             August 30, 2018

              Architectural View of E2E Latency and Gaps

          draft-dunbar-e2e-latency-arch-view-and-gaps-02.txt

Abstract

   Ultra-Low Latency is a highly desired property for many types of
   services, such as 5G MTC (Machine Type Communication) requiring
   E2E connection for V2V to be less than 2ms, AR/VR requiring delay
   less than 5ms, V2X less than 20ms, etc.

   This draft examines the E2E latency from architectural
   perspective, from studying how different OSI layers contribute to
   E2E latency, how different domains, which can be different
   operators' domains or administrative domains, contribute to E2E
   latency, to analyzing the gaps of recent technology advancement
   in reducing latency.

   By studying the contributing factors to E2E latency from various
   angles, the draft identifies some gaps of recent technology
   advancement for E2E services traversing multiple domains and
   involving multiple layers. The discussion might touch upon
   multiple IETF areas.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current
   Internet-Drafts is at
   https://datatracker.ietf.org/drafts/current/.

Dunbar, et al         Expires November 2019           [Page 1]
Internet-Draft    E2E Over Internet Latency Taxonomy

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   This Internet-Draft will expire on February 23, 2019.

Copyright Notice

   Copyright (c) 2018 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
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   without warranty as described in the Simplified BSD License.

Table of Contents

   1. Introduction................................................. 4
   2. Terminology.................................................. 4
   3. AR/VR Use Case............................................... 5
   4. Contributing Factors to E2E Latency.......................... 5
   5. Application Layer Initiative in reducing E2E latency......... 6
      5.1. Content Placement mechanisms need visibility to Network. 6
   6. Transport Layer Initiatives in reducing Latency and gaps..... 7
      6.1. TCP Layer Latency Improvement Alone is not enough....... 7
      6.2. LTE Latency Impact on TCP Performance................... 8
      6.3. Low Latency via Multipath TCP Extension................. 8
   7. Network and Link Layer Initiatives in reducing E2E Latency... 9
   8. Radio Channel Quality Impact to flows with High QoS......... 10
   9. E2E Latency Contributed by multiple domains................. 10
   10. Conclusion................................................. 11
   11. Security Considerations.................................... 11
   12. IANA Considerations........................................ 11
   13. Acknowledgements........................................... 11
   14. References................................................. 11
      14.1. Normative References.................................. 11

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      14.2. Informative References................................ 11
   15. Appendix:.................................................. 12
      15.1. Example: multi-Segments Latency for services via
      Cellular Access............................................. 12
      15.2. Latency contributed by multiple nodes................. 13
      15.3. Latency through the Data Center that hosts S-GW & P-GW 14
   Authors' Addresses............................................. 15

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