IETF106報告会

5G/SRv6関連・NSDT・DMM
KDDI株式会社 丹羽朝信

NSDTについて1◼ Network Slicing Design Team (TEAS WGのサブグループ)◼ 2019年9月に発足◼ IETF(のTE)技術を用いて、Network Slicingを実現するためのフレームワークを検討し、(必要あれば)既存仕様の改善案を提案する
6.5. Design teams
It is often useful, and perhaps inevitable, for a sub-group of a working group to develop a
proposal to solve a particular problem. Such a sub-group is called a design team. In order
for a design team to remain small and agile, it is acceptable to have closed membership andprivate meetings. Design teams may range from an informal chat between people in a hallway
to a formal set of expert volunteers that the WG chair or AD appoints to attack a controversial
problem. The output of a design team is always subject to approval, rejection ormodification by the WG as a whole.
https://ietf.org/about/groups/iesg/statements/design-teams/© 2019 KDDI

Network Slicingとは？(1/2)

2◼ 5Gで期待されている技術(コンセプト)の一つ◼ サービス要件(低遅延等)に応じた”面”を柔軟/動的に構築すること
A network slice is a (set of) element(s) of the network
specialised in the provisioning of a certain (type of) service(s).
- 3GPP TR 21.915: Summary of Rel-15 Work Items -Slice/Service Type
eMBB
URLLC
MIoT

UDM

NSSF

NRF

PCF

V2X

Coreスライス
RANスライス
AMF
RAN© 2019 KDDI

SMF
UPF

アプリケーション

Network Slicingとは？(2/2)

3◼ 各ドメインのスライスを横断して、1つのスライスを構築することを
End-to-End スライスと呼ぶ◼ non-3GPP parts(データセンタNW、トランスポートNW)との連携が必要: NSDTの検討範囲
Northbound API

RANスライス© 2019 KDDI

Coreスライス

3GPP TS 28.530

スライス関連のドラフト数推移

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IETF106

IETF105

3GPP Rel.15

3GPP Rel.16(注意) TitleとAbstractに「slice/slicing」のワードが含まれるドラフト。本内容のスライスと関係ないドラフトも含まれる© 2019 KDDINSDTの発足(1/3)

5◼ IETF105以前スライスでXXXが必要

IETFではYYYがある/議論済み

データモデル
スライスのデータプレーン... etc.

◼ IETF105 TEAS WG
スライスに興味があるメンバを集めて、TEASにおけるスライスの方向性を検討していくのがいいのでは
Chair© 2019 KDDINSDTの発足(2/3)◼ TEAS WG Chairs (2019.9.4)⚫ NSDTメンバの募集
As discussed in Montreal we are forming a design team to help bring focus to the many discussions wehave been having on Network Slicing. The draft objectives and deliverables for the design team are outlinedbelow. At this time we’d like to ask for comments on this draft -- to be sent to the WG list. We would also liketo ask any who are interested in participating in the design team to send the WG chairs (cc’ed above) abrief note expressing your interest, affiliation and relevant expertise. Please do so within one week. We expect
the announcement of the DT formation and membership one week after that.
While we appreciate your interest and willingness to contribute, please be aware that not all who volunteer will
be included in the team. All will be able to participate in this work once we have a WG document on the topic
and, as always, the document progress through normal WG processing. -- We do note that the objective of theDT is to produce an initial draft and there is no requirement for the authorship to be limited to or include all DT
members, and as usual, we expect a WG document to reflect actual contribution to the work.
Thank you,
WG Chairs: Pavan, Lou© 2019 KDDI6NSDTの発足(3/3)◼ TEAS WG Chairs (2019.9.19)⚫ NSDTの発足
This message announces the formation of the TEAS Network Slicing Design Team. The objectives anddeliverables for the design team have been updated based on public and private feedback and is enclosed.
There are changes from what was previously announced in(https://mailarchive.ietf.org/arch/msg/teas/H3azyFI3kIaZDhxwEcSK1_O2CRA), notably calling out scope as
being focused on TE technology as the basis for the DT’s work.
We thank all who expressed interest and willingness to join the design team. As we’re sure all will understand,it was not possible to include all who volunteered in the team. The aim of the DT remains to produce
documents that will follow the normal working process, so all will be able to participate in and contribute to thiswork once we have a WG document as it progresses through normal WG processing. We do note that theobjective of the DT is to produce an initial draft and there is no requirement for document authorship to belimited to or include all DT members, and as usual, we expect a WG document to reflect actual contribution tothe work.
Thank you,
WG Chairs: Pavan, Lou
DT Lead: Jari Arkko© 2019 KDDI

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【IETF106】NSDTのレポート(1/2)

8◼ NSDTが発足してから最初の会合。何をどう進めるか、をWG内に共有◼ ネガティブなフィードバックはなく、以下の方針で進む予定

今は主にココFrameworkに着手開始© 2019 KDDIhttps://datatracker.ietf.org/meeting/106/materials/slides-106-teas-sessb-13-network-slicing-design-team-update-01

【IETF106】NSDTのレポート(2/2)

9◼ やらないこと

特定のエンドポイント(CU/DU/UPF)に特化しない
5Gスライスに特化しない(まずは)特定のスライス実装技術に特化しない例) VPN+、FlexE、DetNetなど© 2019 KDDIDMM WG Updates

10◼ 5G U-Plane Analysis⚫ 3GPPが定める5GCのU-PlaneについてIETFの視点で分析を行い、U-Plane Protocolに対する要求事項・評価軸を整理するドラフト⚫ 3GPP Rel16をもって本ドラフトの更新を終了し、WG Last Call (Information draft)を目指すことについて議論を実施• 明確なコンセンサスは取られていないが、否定的な意見は無かった• 3GPP Rel-16終了→ドラフト更新→WG Review & WG
LCという流れ。URLLCなどが追加される見込み

5G U-Plane Analysis◼ User Plane Message Encoding⚫ GTP-U OAM MessageをSRv6で通知するために、SRHのTag/TLVを利用する提案© 2019 KDDI

User Plane Message Encoding : SRH Tag

まとめ◼ NSDT⚫ Network Slicing Design Teamが発足⚫ トランスポートスライスの定義やフレームワークを検討中⚫ IETF108でのStableが目標◼ DMM⚫ 5G U-Plane Analysisのドラフトは、3GPP Rel.16をもってWG LCを目指す© 2019 KDDI11