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ITU-T FG-IMT2020 Pre-Meeting Workshop

Overview of network softwarization and adoption to 5G

Aki Nakao UTokyo 5GMF

2015/9/21

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AWG-18, Kyoto, Japan

TOR and Gap Analysis

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Work Items Champion Activities Overview of use cases NEC Discussion of various use cases of 5G mobile network

High level architecture ETRI, CMCC High Level Architecture of 5G mobile network

Emerging networking tech. (CCNx, ICN, etc.)

CISCO CCNx and ICN for backhaul network (PARC, CISCO)

End-to-end QoS KT QoS of End-to-end Communication

Network Softwarization 5GMF Network Softwarization with 5G specific extensions (UTokyo, NTT, Waseda U, UCL, …)

Fronthaul/Backhaul Huawei Fronthaul Backhaul issues (Huwawei, TTC, …)

http://www.itu.int/en/ITU-T/focusgroups/imt-2020/Documents/ToR-IMT-2020.pdf

The objective of the Focus Group is to produce materials of gap analysis of IMT-2020 in order to identify the relevant scope of ITU-T Recommendations on the fixed network of IMT-2020. The gap analysis may be accompanied by high level technical aspects such as use cases, requirements and other aspects. The Focus Group also serves as an open platform for network architecture experts representing ITU members and non-members to move forward in the IMT-2020 direction.


Network Softwarization

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Network Softwarization is an overall transformation trend for designing, implementing, deploying, managing and maintaining network equipment and/or network components by software programming, exploiting the natures of software such as flexibility and rapidity in the progressing with the lifecycle of network equipment / components, for the sake of creating conditions to reinvent network and services architectures, to optimize costs and processes, to enable self-management and to bring new values in infrastructures. Additional benefits are in enabling global system qualities (e.g. execution qualities, such as usability, modifiability, effectiveness, security and efficiency; evolution qualities, such as testability, maintainability, reusability, extensibility, portability and scalability). Viable architectures for network softwarization must be carefully engineered to achieve suitable trade-offs between flexibility, performance, security, safety and manageability.

Focus Group On IMT-2020 @ Turin, IMT-I-063

AWG-18, Kyoto, Japan 4


5G Specific Network Softwarization

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1)  Harmonization of SDN and NFV 2)  5G Extensions to the current SDN and NFV

(Vertical Extension and Horizontal Extension) 3)  Considerations for applicability of softwarization 4)  Application driven 5G network softwarization 5)  5G network softwarization energy characteristics 6)  5G network softwarization management characteristics 7)  5G network softwarization economic characteristics



Organizational Structure of the 5GMF

General Assembly

Advisory Board

Strategy & Planning Committee

Technical Committee (Wireless

Technology)

Service & Application Committee

Network Architecture Committee

Chairman of 5GMF Susumu Yoshida, Kyoto Univ. Vice chairmen of 5GMF Masao Sakauchi, NICT Hiromichi Shinohara, NTT　

Chairman Hiroyuki Morikawa, Univ of Tokyo Acting chairman Takehiro Nakamura, NTT DOCOMO

Chairman Seiichi Sampei, Osaka Univ. Acting chairmen Akira Matsunaga, KDDI Takaharu Nakamura, Fujitsu

Chairman Gota Iwanami, INFOCITY Acting chairman Toshiki Hayashi, GEO NETWORKS

Chairman Akihiro Nakao, Univ of Tokyo Acting chairman Ryutaro Kawamura, NTT

•  Strategy & Planning of 5G mobile and develop outcomes from this forum

•  Contact, coordinate and confer with suitable organizations in and outside Japan

•  Coordinate among the various committees of this forum

•  Study technology and frequency requirements for 5G mobile

•  Contact, coordinate and confer with international standards organizations and overseas organizations regarding technologies

•  Study mobile applications for the 2020’s

•  Study overall network architecture for 5G mobile

•  Study requirements and technologies for network infrastructure

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Technology roadmap toward 5G mobile networks



(Deep) Programmability

Mobile Edge Computing Fronthaul / Backhaul

Management / Orchestration

Application Driven

Automation

Autonomy

Multi-Tenancy Edge Security Data Isolation

Intelligence

Knowledge Low Latency Analytics

Extreme Flexibility

End-to-end Quality of 5G Applications

Number of Devices Latency Data rate

Requirements

Technology Focus Areas

Technology Roadmap: Focus Area


Wireless Performance Requirement in 5G

9 ITU-R IMT Vision (IMT2020)


End-to-End Latency Consideration

10 N. Nikaein, and S. Krco, "Latency for Real-Time Machine-to-Machine Communication in LTE-Based System Architecture," in European Wireless Conference, Apr. 2011.


RRH

Breakdown of E2E Delay

User Equipment

BBU S-GW P-GW

Control (MME, PCRF, etc)

MFH MBH Transport

Mobile Network Server

Radio IF

Platform

Application (Incl. Sensors)

Network IF

Platform

Application

Upwards Downwards

MFH (Mobile FrontHaul) MBH (Mobile BackHaul) MME (Mobility Management Entity) PCRF (Policy and Charging Rule Function)

RRH (Remote Radio Head) BBU (Base Band Unit) S-GW (Serving Gateway) P-GW (Packet Data Network Gateway)

Inter-Domain Network Radio IF

①

②

③

④

⑤

⑥

⑦

⑧

⑨

⑩

⑪

One way latency defined in 5G: ②＋③＋④＋⑤


Latency Budget Breakdown

①UE Processing Delay ②Air Interface Delay ③RRE Processing Delay ④Fronthaul Transmission Delay ⑤BBU Processing Delay ⑥Backhaul Transmission Delay ⑦S-GW Processing Delay ⑧Transport Network Delay ⑨P-GW Processing Delay ⑩Inter-Domain Network Delay ⑪Server Processing Delay

4G: 10msec 5G: 1msec (target)

L2 (Ethernet MPLS-TP) 40usec/hop HW 200usec SW 600usec L3 (IP MPLS) 50usec/hop

HW 200usec SW 600usec

Varies (e.g., VPN-SLA 35msec) System Dependent

System Dependent

further break-down necessary


Tactile Internet

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Human Reaction Time

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When reacting to a sudden, unforeseen incident, 1 sec. The human auditory reaction time, 100 milliseconds. A typical human visual reaction time, 10 milliseconds.

If a human is expecting speed, for rapid response, 1 millisecond.


Latency Budget for Tactile Internet

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Applications and Infrastructure Requirements

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Comprehensive Architecture of 5G Mobile Networks


Mobile packet core Radio access network (RAN) UE

Control

Slice A Slice B

Slice C

Network management

and orchestration

Applications & Services with various requirements (M2M/IoT, Content delivery, Tactile)

Cloud

Goal : End-to-End Quality and Extreme Flexibility to Accommodate Various Applications

Virtualized networks/platform App-Driven API API

Physical infrastructure (network, computing and storage resources)

Network nesources

Computation and storage resources UE Data Centers

MFH MBH Transport RAT(s)


Mobile Edge Computing

Management Orchestration

Fronthaul Backhaul

Comprehensive architecture of 5G mobile networks


Service application @ user devices

Application data

Server-side functions @ data center,

cloud, and/or

edge(MEC)

Service specific control

for a Slice

Control messages

Network functions

Application data

Manageent messages

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Management & orchestration

Infrastructure

Inter-slice manager

Service specific control for each application service are allocated on each slice.

Slice generation/ termination & management.

assign topology, protocols, and network

functions

Resource allocation and monitoring

User devices

Life cycle management

Resource management

Slice A Slice B

Slice C

A device may be connected to multiple slices simultaneously.

E2E Functional Model Inter-slice manager coordinates service specific controls for slices, and manages a common control function if necessary.

Management & Orchestration is responsible for life cycle management of slices. It performs placement and instantiation of network functions. Further more, it performs association to the function on user devices and service-side functions.

Server side functions may be located on the infrastructure provided by other parties

Control messages


Gap Analysis @ FG Conference Calls

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•  Vertical extension to slice •  Horizontal extension to slice •  Hardware / Software discrimination •  Overall Functional Architecture (5GMF) •  Scalable operation •  APIs •  Application driven direct programmability •  Network management and orchestration •  Mobile edge computing •  Resource optimization over end to end path (Redundancy elimination) •  Emerging Network Architecture Enabled by NetworkSoftwarization •  Capability exposure



Vertical Extension to Slicing

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The current SDN technology is limited to programmability of control plane, and only recently the extension of programmability to data plane is being discussed in research community without well-defined use cases. For 5G mobile networking, there are several use cases for driving invention and introduction of new protocols and architectures especially at the edge of the network. For instance, the need for redundancy elimination and low latency access to contents in content distribution drives ICN and CCN at mobile backhaul networks. Therefore, there exists a gap between the current projection of SDN and NFV technology development and the requirements for 5G. The infrastructure for 5G mobile networks must support deeper data plane programmability for defining new protocols and mechanisms.



Torward Deep Programmability

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OpenFlow

Action Set Extension

Classification Extension

Extended OpenFlow

Deeply Programmable

SDN

Classification (Pattern Match) Generic

Classification

Generic Classification

Generic Action Set

Generic Action Set

Application to 5G Specific Protocol Support

e.g., ICN/CCN Protocols IoT/M2M Protocols

Action Set

(Vendor Extensions)


FLARE-DPDK Architecture Design

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•  Generic Classifications /Actions •  Light Weight MEC •  Ultra Low Latency Applications


Cf. NFV Function Chaining

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FLARE Commercialization

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l x86 CPU (LXC on top) l 72 core EZ-‐Chip NPU (LXC on Top) l GbE: 24ports and 10GbE SFP+: 2 ports (or 10GbE SFP+ : 8 ports) l Up to 128GB memory for NPU l Redundant Power supply l Swappable SSD x2

x86 Processor

Many Core Processor


Acknowledgment

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Part of the work presented in these slides has been supported by the collaboration with NTT Innovation Laboratory

Especially, we are seeking application-driven thinking

and deeply programmable network (DPN) infrastructure


Summary

n  5GMF Network Architecture Committee has been studying overall network architecture for 5G mobile

n  Challenges, requirements and technologies for network infrastructure has been discussed to create the Network Technology Roadmap

n  Outcome of the committee will be included in 5GMF white paper, which will be published in Autumn, 2015

n  5GMF Network Architecture Committee will contribute to FG IMG-2020 from the perspectives of Network Softwarization, Mobile Edge Computing, Operations and Management, and MFH/BFH in conjunction with TTC, Japan.

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