GTI-5G网络切片白皮书v2.0（英文）-2019.2-32页 (2).pdf

GTI 5G Network Slicing White Paper V2.0 1 GTI 5G Network Slicing White Paper V2.0 http:/www.gtigroup.org GTI 5G Network Slicing White Paper V2.0 2 GTI 5G Network Slicing White Paper V2.0 Version:V2.0 Deliverable Type Procedural Document Working Document Confidential Level Open to GTI Operator Members Open to GTI Partners Open to Public Working Group XXX Task 5G eMBB Architecture Network Slice Source members ZTE,Huawei,Nokia Support members ZTE,Huawei,Nokia Editor ZTE,Huawei,Nokia Last Edit Date 31-01-2019 Approval Date DD-MM-2019 GTI 5G Network Slicing White Paper V2.0 3 Confidentiality:This document may contain information that is confidential and access to this document is restricted to the persons listed in the Confidential Level.This document may not be used,disclosed or reproduced,in whole or in part,without the prior written authorization of GTI,and those so authorized may only use this document for the purpose consistent with the authorization.GTI disclaims any liability for the accuracy or completeness or timeliness of the information contained in this document.The information contained in this document may be subject to change without prior notice.Document History Date Meeting#Version#Revision Contents 12-02-2018 V1.0 Initial first version of GTI 5G Network Slicing White Paper 31-01-2019 V2.0 Update GTI 5G Network Slicing White Paper GTI 5G Network Slicing White Paper V2.0 4 Table of Contents 1 Network slicing conceptual architecture.5 2 Driving force of Network slice.6 2.1 Trends and Demands of the Vertical Industry.6 2.2 Insight into the value of network slicing.9 3 Key Technologies of E2E Slicing.12 3.1 Enabling Technologies of the Network Domain.12 3.1.1 Core Network.12 3.1.2 Wireless.13 3.1.3 Bearer.16 3.1.4 Terminal.19 3.2 Slicing O&M Management.20 3.3 Slicing Isolation and Security.21 4 End-to-end Slice Deployment and Evolution.23 5 Foresight Technologies and Trends of Network Slicing.24 6 End-to-end Use Case.26 7 Summary and Prospective.32 GTI 5G Network Slicing White Paper V2.0 5 1 Network slicing conceptual architecture Network Slice is a logical network that provides specific network capabilities and network characteristics.It realizes multiple network services in a unified physical facility and provides multi-level isolation and security,reducing the cost of network construction for operators and satisfying the needs of multiple industries in the vertical industry.5G end-to-end network slicing is flexibly allocated according to network resources,and network capabilities are combined on demand.Based on a 5G network,multiple logical subnets with different features are virtualized.Each end-to-end slice is composed of a core network,a wireless network,and a transmission network sub-slice,and is managed by an end-to-end slice management system.Figure 1-1 Slicing Concept Architecture Different Slice(e.g.mMTC,eMBB,URLLC)can contain slice specific NFs(e.g.AMF,SMF,UPF etc.)or slice shared NFs(e.g.AAU,DU,CU).CN slice subnet can be virtualized and distributed in Edge DC or Core DC.TN slice subnet can provide rapid or ordinary forwarding channel for different SLA requirement.AN slice subnet can provide different network slices by resource scheduling.Different communication services are provided by service provider through using different slice.User can access different services based on different slices.GTI 5G Network Slicing White Paper V2.0 6 2 Driving force of Network slice 2.1 Trends and Demands of the Vertical Industry Vertical Industry worldwide is undergoing a tremendous digital transformation featuring the convergence of information/communications technology and operation technology in various segments.Industry digitization involves the connection of massive numbers of machines and people,with open data sharing and a generic ICT infrastructure to support them.5G will be a major technology in growing industrial digitalization,creating and enhancing industry digitalization use cases.We categorize the vertical industry 5G serving as following according to the basic 5G service/slice types eMBB,mIoT and URLLC:Figure 2-1 5G Vertical industry Here we will take a representative vertical industry as insight for the trends and demands in some vertical industry.Table 2-1 Trends and demands in vertical industry Manufacture Hyper competition with no sustainable competitive advantages.Increasing volatility from business cycles and product lifecycles.The smart factory is advancing from developments in the internet of things and automation Healthcare Increasing consumer attention on wellbeing Increasing cost to fit with social demographic changes Increasing demand on quality,patient safety and data storage.Changing consumer behavior,freedom of choice and alternative service provider.automotive Autonomous driving and connected traveler with telematics.Car sharing and changing commuter habits Electric mobility with decreasing battery costs and a green agenda eMBBSmart City(e.g.surveillance)Remote EducationmMTCutility(Smart Meters&sensors)?Collabora-tive robotsuRLLCRemote SurgeryUAV controlManufacturing UtilitiesRoboticsvertical industryTele-medicine?eHealth monitoring GTI 5G Network Slicing White Paper V2.0 7 Digital enterprise and connected supply chain Digital vehicle ecosystem Infotainment on the move Urbanization and inter mobility Environmental awareness-CO2 emissions and public spaces Urban lifestyle and growing expectations on public transport Energy utility Oil supply imbalance and instability and carbon constraints Structural shifts with increasing retiring assets New decentralized business models Electrification and renewable energy generation Requirement of the vertical industry 5G is addressing the more stringent and business critical requirements of the vertical industries,such as real-time capabilities,latency,reliability,security and guaranteed Service Level Agreement(SLA)s.Here we set three hierarchy of requirements for vertical industry including Operational Requirements,Functional Requirements and Performance Requirements.Figure 2-2 5G Needs of Vertical Type 1:Performance requirements:latency,throughput,availability and resilience,reliability,coverage and mobility.The target of very low latency combined with high reliability of 5G will enable many applications to be untethered,supporting a larger number of use cases that today require fixed line connectivity.High availability is essential to ensure minimal service accessibility to critical infrastructures or service providers in case of a disaster.Reliability is defined as the GTI 5G Network Slicing White Paper V2.0 8 probability that a certain amount of data to/from an end user is successfully transmitted to another peer within a predefined time frame,i.e.,before a certain deadline expires.Type 2:Functional requirements:Security and Identity Management,Isolation.Security communications need to guarantee that personal or confidential data must not reach the public domain and not be modified or replayed by unauthorized parties.Identity management relates to the management of devices and user identities.5G will connect a huge variety of devices and users which have subscriptions to vertical service providers.This demands for a new device-user identity management and related lifecycle management,which will complement the universal SIM(USIM).While using a shared network infrastructure,the different vertical industries(and optionally the various services),need to be isolated one from another.That means that each virtual network belonging to different vertical customers are protected,preventing their resources from being accessed by network nodes of others.Type 3:Operational requirements Verticals will be able to timely deliver their service to their own customers by ordering a network slice it in a simple way,e.g.through a simple user interface.Several industries may rely on the Mobile Network Operator(MNO)for the deployment and management of their own network slice while other industries may want to do it independently.Depending on assets and business,multiple models are needed for managing service/applications and customers of the verticals.In one model the vertical industry customer has their own customers but no network resources.The vertical requests a network slice via a North Bound Interface(NBI)of the MNO,realized e.g.though a dashboard-like web service.Another model is the one of a vertical who owns part of network resources and designs and customizes own service.In this case the vertical provider may need part of the network(for example the RAN)of the MNO according to a given SLA via the NBI as in the case above.By 5G network slicing based on SLA business service agreement signed with customers,CSP can provide isolated and functional network services for different vertical industries,different customers and different services.In the future,the 5G network slice will have a broad market application prospect for consumer market and vertical industry.However,due to the different maturity of the 5G industry chain applied by different industries,the scale application of the 5G network slice will be divided into three stages.The first outbreak will be eMBB business with the most mature industry chain and clear market prospects,such as 4K/8K HD video live broadcast,360 degree VR watch,VR/GTI 5G Network Slicing White Paper V2.0 9 AR/MR cloud game,as well as smart city HD video surveillance,car entertainment,distance education,etc.;Then URLLC business closely related to the vertical industry,based on its ultra-low latency,ultra-high reliability,combined with eMBB,will fully enable digital transformations in industry,energy,transportation,healthcare,education,agriculture,etc.,such as robotics,smart energy,autonomous driving,networked drones,telemedicine diagnostics,etc.;Finally,mMTC business may have a low commercialization due to the lag of the mMTC standard,the high initial terminal cost,and the competition of existing IoT and other IoT technologies such as 3G/4G/NB.Typical applications include smart homes,asset tracking,smart city environment monitoring,smart water meters,and more.2.2 Insight into the value of network slicing Until now,telecom network design has been largely static and based on creating a one-size-fits-all infrastructure.However,the arrival of 5G brings about a new focus on specific use cases and how they can be supported.Network slices will create virtual instances of a network,using the same underlying hardware,to meet each use cases needs.Why network slicing is important 1.Industry digitization will be fueled by customized communication solutions that are dynamic and open.Through Network Slicing,redefine information sharing in a wide variety of industrial scenarios,ranging from ultra-reliable low-latency machine communications to the small-packet burst transmission of operations data.2.5G slicing technology in particular,will help make pervasive networks of intelligent objects,machines,and people a reality.There is a growing number of opportunities for new business models bringing artificial intelligence,robotics and autonomous control to networks of industrial machines,devices and systems.This is re-defining the need for a new type of secure,robust and customer managed communication.3.Future industry will be characterized by rapidly evolving service requirements and innovations.Correspondingly,the sustaining network technology should also be flexible and scalable to adapt to ever-changing business/service needs.5G Network Slicing for Cross Industry Digitization is expected to help connect,move and process information at speeds.GTI 5G Network Slicing White Paper V2.0 10 4.The network slicing with next generation communication fabric will provide effective mechanisms to allow dynamic provision of communication services for different tenants(industry users)with proper independence.The true value of network slicing Operators face great pressing on business model transformation:They need to change business from traffic management to differentiated services for vertical industries.In addition to the traditional B2C business model,it is necessary to seek new business models such as B2B or B2B2C.Network slicing offers operators a way to provide premium services to multiple customers.There are two revenue opportunities for operators that Network slicing can creates:Serving existing high-end customers with higher grade service:services tailored to the needs of a current customer or customer segment are more valuable and can win a premium Average Revenue Per User(ARPU)Reaching new customers for whom premium service is critical:new customer segments can be addressed,creating completely new,additional revenue streams.From Bell Labs Consultings result(Unleashing the economic potential of network slicing),with network slicing,operators have a new means of expanding their business and winning new revenue by delivering premium services focused on the requirements of customer segments,such as high network performance in key areas or to meet specific regulatory or compliance needs.By applying automation to control network slice operating costs,operators have the potential to use network slicing to win business in many new areas.Network slicing delivers higher operating margins.Network slicing has the potential to reach new customer segments and generate substantial extra revenue for an operator.These customer needs cannot be met with single,one-size-fits-all networks End-to-end network slicing opens further customer segments with costs that scale more or less in line with the additional demand,making them commercially viable Implementing automation effectively brings down the operational costs of network slices,enabling an operator to address more customers profitably.With full automation,the TCO of even high numbers of network slices becomes acceptable The accurate preparation of network slices and their operation is critical to ensure that GTI 5G Network Slicing White Paper V2.0 11 premium services are supported by the network.GTI 5G Network Slicing White Paper V2.0 12 3 Key Technologies of E2E Slicing 3.1 Enabling Technologies of the Network Domain 3.1.1 Core Network The Core Network(CN)is considered as the most critical and essential part in network slicing.The CN provides the network services for the tenants and their end users,for instance control plane functions(mobility management,session management,policy control,and charging)and user plane functions(data forwarding).To meet the diversified demands of vertical industries,the network service customization and on-demand deployment are the key concepts that need to be reflected in the CN design.The CN is envisioned to have the following attributes:Cloudification:Cloud native technology adoption will enable the future CN to support a large number of NSIs over common infrastructure,which is based on a three-tier DC networking mode.The bottom layer is the edge DC that is close to or on the a