User Plane Protocol and Architectural Analysis on 3GPP 5G System
draft-ietf-dmm-5g-uplane-analysis-02
DMM Working Group S. Homma
Internet-Draft NTT
Intended status: Informational T. Miyasaka
Expires: January 9, 2020 KDDI Research
S. Matsushima
SoftBank
D. Voyer
Bell Canada
July 8, 2019
User Plane Protocol and Architectural Analysis on 3GPP 5G System
draft-ietf-dmm-5g-uplane-analysis-02
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.
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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 . . . . . . . . . . . . . . . . 4
2. Terms and Abbreviations . . . . . . . . . . . . . . . . . . . 4
3. GTP-U Specification and Observation . . . . . . . . . . . . . 6
3.1. GTP-U Tunnel . . . . . . . . . . . . . . . . . . . . . . 6
3.2. GTP-U Header Format . . . . . . . . . . . . . . . . . . . 10
3.3. Control Plane Protocol for GTP-U . . . . . . . . . . . . 12
3.4. GTP-U message . . . . . . . . . . . . . . . . . . . . . . 13
3.5. Packet Format . . . . . . . . . . . . . . . . . . . . . . 14
3.6. Observations Summary . . . . . . . . . . . . . . . . . . 16
4. 5GS Architectural Requirements for User Plane Protocols . . . 16
4.1. Overview of 5G System Architecture . . . . . . . . . . . 16
4.1.1. UPF Functionalities . . . . . . . . . . . . . . . . . 18
4.1.2. UP Traffic Detection . . . . . . . . . . . . . . . . 19
4.1.3. User Plane Configuration . . . . . . . . . . . . . . 21
4.2. Architectural Requirements for User Plane Protocols . 22
5. Evaluation Aspects . . . . . . . . . . . . . . . . . . . . . 28
5.1. Supporting PDU Session Type Variations . . . . . . . . . 29
5.2. Nature of Data Path . . . . . . . . . . . . . . . . . . . 29
5.3. Supporting Transport Variations . . . . . . . . . . . . . 30
5.4. Data Path Management . . . . . . . . . . . . . . . . . . 30
5.5. QoS Control . . . . . . . . . . . . . . . . . . . . . . . 31
5.6. Traffic Detection and Flow Handling . . . . . . . . . . . 32
5.7. Supporting Network Slicing Diversity . . . . . . . . . . 32
5.8. Reliable Communication support . . . . . . . . . . . . . 33
6. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . 33
7. Security Consideration . . . . . . . . . . . . . . . . . . . 34
8. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 34
9. Informative References . . . . . . . . . . . . . . . . . . . 34
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