User Plane Protocol and Architectural Analysis on 3GPP 5G System
draft-hmm-dmm-5g-uplane-analysis-01

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DMM Working Group                                               S. Homma
Internet-Draft                                                       NTT
Intended status: Informational                               T. Miyasaka
Expires: February 11, 2019                                 KDDI Research
                                                           S. Matsushima
                                                                SoftBank
                                                                D. Voyer
                                                             Bell Canada
                                                         August 10, 2018

    User Plane Protocol and Architectural Analysis on 3GPP 5G System
                  draft-hmm-dmm-5g-uplane-analysis-01

Abstract

   This document analyzes the mobile user plane protocol and the
   architecture specified in 3GPP 5G documents.  The analysis work is to
   clarify those specifications, extract protocol and architectural
   requirements and derive evaluation aspects for user plane protocols
   on IETF side.  This work is corresponding to the User Plane Protocol
   Study work on 3GPP side.

Status of This Memo

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of

Homma, et al.           Expires February 11, 2019               [Page 1]
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Current Status of Mobile User Plane for 5G  . . . . . . .   3
     1.2.  Our Way of Analysis Work  . . . . . . . . . . . . . . . .   3
   2.  Terms and Abbreviations . . . . . . . . . . . . . . . . . . .   4
   3.  GTP-U Specification and Observation . . . . . . . . . . . . .   5
     3.1.  GTP-U Tunnel  . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  GTP-U Header Format . . . . . . . . . . . . . . . . . . .   9
     3.3.  Control Plane Protocol for GTP-U  . . . . . . . . . . . .  12
     3.4.  GTP-U message . . . . . . . . . . . . . . . . . . . . . .  12
     3.5.  Packet Format . . . . . . . . . . . . . . . . . . . . . .  13
     3.6.  Observations Summary  . . . . . . . . . . . . . . . . . .  15
   4.  5GS Architectural Requirements for User Plane Protocols . . .  15
     4.1.  Overview of 5G System Architecture  . . . . . . . . . . .  15
       4.1.1.  UPF Functionalities . . . . . . . . . . . . . . . . .  17
     4.2.  Architectural Requirements for User Plane     Protocols .  18
   5.  Evaluation Aspects  . . . . . . . . . . . . . . . . . . . . .  20
     5.1.  Supporting PDU Session Type Variations  . . . . . . . . .  21
     5.2.  Nature of Data Path . . . . . . . . . . . . . . . . . . .  21
     5.3.  Supporting Transport Variations . . . . . . . . . . . . .  22
     5.4.  Data Path Management  . . . . . . . . . . . . . . . . . .  22
     5.5.  QoS Control . . . . . . . . . . . . . . . . . . . . . . .  23
     5.6.  Traffic Detection and Flow Handling . . . . . . . . . . .  24
     5.7.  Supporting Network Slicing Diversity  . . . . . . . . . .  24
   6.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .  25
   7.  Security Consideration  . . . . . . . . . . . . . . . . . . .  25
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  26
   9.  Informative References  . . . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  30

1.  Introduction

   This document analyzes the mobile user plane protocol and the
   architecture specified by 3GPP 5G documents.  The background of the
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