Beyond mareks/eims/files/Beyond-IMS.pdf¢  2020-01-22¢  Mellanox - Metaswitch - Overture Networks - Qosmos

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  • Beyond IMS …

  • Evolution to a flat LTE network

    EIMS 2019/2020

  • EPC (Evolved Packet Core) new core network for LTE

    EIMS 2019/2020

    Source: Alcatel-Lucent

  • All IP network for LTE

    EIMS 2019/2020

    Source: Alcatel-Lucent

  • EPC architecture – 3GPP Release 8

    EIMS 2019/2020

    SGi

    PCRF

    Gx

    HSS

    S2b

    SWn

    Ope rator's IP Services

    (e.g. IMS, PSS etc.)

    SWm

    SWx

    Untrusted Non - 3GPP IP

    Access SWa

    HPLMN

    Non - 3GPP Networks

    S6b

    Rx

    PDN Gateway

    ePDG 3GPP AAA Server

    Gxb

    S2a

    Gxa

    Trusted Non - 3GPP IP

    Access STa

    Gxc

    S5

    S6a

    3GPP Access

    Serving Gateway

    UE

    SWu

  • EPC architecture

    EIMS 2019/2020

  • Evolved Packet Core (EPC)

    • Multi-access core network based on the Internet Protocol (IP) as one common packet core network for both

    – Trusted networks including • 3GPP Access (LTE-E-UTRAN, UMTS-UTRAN, GPRS-

    GERAN) • Non 3GPP Access (WIMAX, CDMA2000/HRPD)

    – Untrusted networks including • Non-3GPP Access (WLAN)

    • EPC provides connection to IP service domains

    – IMS – Internet (or others, e.g. P2P etc.)

    • Important EPC functions include: – NAS and security (AAA) – mobility and connectivity management – policy QoS control and charging (PCC)

    EIMS 2019/2020

    IMS Internet

    3GPP access

    non-3GPP access

    EPC

    Trusted Trusted/ untrusted

  • NFV – Network Function Virtualization

    EIMS 2019/2020

  • A means to make the network more flexible and simple by

    minimising dependence on HW constraints

    v

     Network Functions are SW-based over well-known HW

     Multiple roles over same HW

    ORCHESTRATION, AUTOMATION

    & REMOTE INSTALL

    DPI BRAS

    GGSN/

    SGSN

    Firewall

    CG-NAT

    PE Router

    VIRTUAL

    APPLIANCES

    STANDARD

    HIGH VOLUME

    SERVERS

    Virtualised Network Model: VIRTUAL APPLIANCE APPROACHv

     Network Functions are based on specific HW&SW

     One physical node per role

    DPI

    BRAS GGSN/SGSN

    Session Border

    ControllerFirewall CG-NAT

    PE Router

    Traditional Network Model: APPLIANCE APPROACH

    The NFV Concept

    Source: Adapted from D. Lopez Telefonica I+D, NFV

    EIMS 2019/2020

  • BRAS

    FirewallDPI

    CDN

    Tester/QoE

    monitor

    WAN

    Acceleration Message

    Router

    Radio Access

    Network Nodes

    Carrier

    Grade NAT

    Session Border

    Controller

    Network Virtualisation Approach

    PE RouterSGSN/GGSN

    Independent Software Vendors

    Standard High Volume

    Ethernet Switches

    Standard High Volume Storage

    Standard High Volume Servers

    Orchestrated,

    automatic &

    remote install.

    • Fragmented non-commodity hardware. • Physical install per appliance per site. • Hardware development large barrier to entry for new

    vendors, constraining innovation & competition.

    Classical Network Appliance Approach

    Target

    Source: NFV

    EIMS 2019/2020

  • Network Functions Virtualization • Network Functions Virtualization is about

    implementing network functions in software - that today run on proprietary hardware - leveraging (high volume) standard servers and IT virtualization

    • Supports multi-versioning and multi-tenancy of network functions, which allows use of a single physical platform for different applications, users and tenants

    • Enables new ways to implement resilience, service assurance, test and diagnostics and security surveillance

    Source: Adapted from D. Lopez Telefonica I+D, NFV

    EIMS 2019/2020

  • Network Functions Virtualization

    • Provides opportunities for pure software players • Facilitates innovation towards new network functions

    and services that are only practical in a pure software network environment

    • Applicable to any data plane packet processing and control plane functions, in fixed or mobile networks

    • NFV will only scale if management and configuration of functions can be automated

    • NFV aims to ultimately transform the way network operators architect and operate their networks, but change can be incremental

    EIMS 2019/2020

  • Benefits & Promises of NFV

    • Reduced equipment costs (CAPEX) – through consolidating equipment and economies of scale of IT industry.

    • Increased speed of time to market – by minimising the typical network operator cycle of innovation.

    • Availability of network appliance multi-version and multi- tenancy,

    – allows a single platform for different applications, users and tenants.

    • Enables a variety of eco-systems and encourages openness.

    • Encouraging innovation to bring new services and generate new revenue streams.

    Source: NFV EIMS 2019/2020

  • Benefits & Promises of NFV • Flexibility to easily, rapidly, dynamically provision and

    instantiate new services in various locations

    • Improved operational efficiency • by taking advantage of the higher uniformity of the physical network

    platform and its homogeneity to other support platforms.

    • Software-oriented innovation to rapidly prototype and test new services and generate new revenue streams

    • More service differentiation & customization • Reduced (OPEX) operational costs: reduced power, reduced

    space, improved network monitoring

    • IT-oriented skillset and talent

    Source: Adapted from D. Lopez Telefonica I+D, NFV

    EIMS 2019/2020

  • ETSI – NFV Architecture (2012)

    EIMS 2019/2020

  • NFV layers

    EIMS 2019/2020

    NFV Infrastructure

    End Point

    End Point

    E2E Network Service

    Compute Storage NetworkHW Resources

    Virtualization LayerVirtualization SW

    Virtual Compute

    Virtual Storage

    Virtual Network

    Virtual Resources

    Logical Abstractions

    Network Service

    VNF VNF VNF

    VNF VNF

    Logical Links

    VNF Instances

    VNF VNF VNF SW Instances

    VNF : Virtualized Network Function

    VNF

  • Mobile Core Network and IMS • Mobile networks are populated with a large

    variety of proprietary hardware appliances

    • Flexible allocation of Network Functions on such hardware resource pool could highly improve network usage efficiency

    • Accommodate increased demand for particular services (e.g. voice) without fully relying on the call restriction control mechanisms in a large-scale natural disaster scenario such as the Great East Japan Earthquake

    EIMS 2019/2020

  • NFV components

    • Network Function (NF) – Functional component with a precisely defined interfaces and

    operation

    • Virtualized Network Function (VNF) – Software implementation of a NF which can be deployed in a

    virtualized infrastructure

    • VNF Set – Connection between VNF, np. access gateway

    • VNF Forwarding Graph – Arrangement of services when order of network connections matters

    e.g. firewall, control of load balancing, NAT

    • NFV Infrastructure (NFVI) – Hardware and software needed to deploy, manage and operate VNF

    EIMS 2019/2020

  • NFV: general use cases

    EIMS 2019/2020

    Use Case Description

    1. NFV IaaS Infrastructure as a Service

    Computing, Storage and Network as a Service for end users

    2. NFV SaaS Virtual Network Function as a Service

    Software as a Service for end users

    3. NFV PaaS Virtual Network Platform as a Services

    Platform as a Service for end users

    4. Virtual Network Forwarding NFV internetworking: defining the logical connectivity paths between virtual appliances

    5. Virtualization of Mobile Core and IMS

    Virtualization of Evolved Packet Core and IMS elements: MME, Gateways, CSCF, HSS

    6. Virtualization of Mobile Base Station

    Baseband radio processing using IT virtualization techniques for signal processing capacity aggregation and centralization

    7. Virtualization of Home Environment

    Replacing customer premise residential gateway and set-top boxes with virtual services in the network

    8. Virtualization of CDNs Running content delivery network nodes as virtual appliances on operator infrastructure

    9. Fixed Access Network Functions Virtualization

    Applying virtualization to reduce the complexity of access nodes, links and network services

  • Function virtualization in mobile networks

    • Switches – MSC , Open vSwitch • Routers • Home Location Register (HLR) • Serving GPRS Support Node (SGSN), • Gateway GPRS Support Node (GGSN), • Combined GPRS Support Node (CGSN),

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