UMTS Architecture III 0405

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 1

    Course Overview Motivation

    Standardization issues

    UMTSarchitecture basics

    UE,UTRA,UTRAN,PSDomain,CSDomain Basicfunctionalities:

    Accessing the network

    Transferringdata

    Detaching from the network

    Informationstorage

    Mobility

    QoS

    Security

    Charging

    IMS

    Example signaling flows

    UMTSEvolution:from R99toRel6

    Beyond UMTS

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 2

    UMTS architecture basics Principles ofnetwork architectures

    Forcomparison:GSMarchitecture

    Forcomparison:GPRSarchitecture

    Conceptual UMTSarchitecture

    UE UTRAN

    PSDomain

    CSDomain IMS

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 3

    Principles of network architectures

    Anetwork architecture is defined by

    functional groups

    defined by aset offunctions

    reference points

    conceptual points separating functional groups

    The concept offunctional groups may be applied ina

    hierarchical manner

    The functions ofafunctional group may be performed by

    one or more physical piece ofequipment

    Areference pointmay represent aphysical interface

    between pieces ofequipment

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 4

    Principles of network architectures

    High level view of a mobile network architectureMobile Station (MS) or

    User Equipment (UE)

    U

    I

    G

    Functional Group

    Reference PointU

    External Networks (Internet, PSTN,...)

    Radio Access Network (RAN)

    Core Network (CN)

    Each FunctionalGroupis

    responsible for well-defined

    functionality E.g.radio resource management

    Modularstructure allows building

    blockapproach

    Can exchange e.g.RANwithout

    influencing the rest

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 5

    UMTS architecture basics Principles ofnetwork architectures

    Forcomparison:GSMarchitecture

    Forcomparison:GPRSarchitecture

    Conceptual UMTSarchitecture

    UE UTRAN

    PSDomain

    CSDomain IMS

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    For comparison: GSM GSMis acircuit switchednetwork

    asopposed topacketswitched networks based e.g.onIP

    for allservices (e.g.voice,fax,wap)anend-to-end

    connection is established

    allservices are reserved the identical bandwidth

    wasteful particularly onradio interface

    allservices are charged onaper-timeunit basis

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 7

    Simplified GSM architecture

    External Networks

    Base Station Subsystem (RAN)

    Routing (MSC)

    Mobility management (MSC)

    Collection of charging information (MSC)

    Subscriber management (MSC)

    Interworking with external networks (GMSC)

    Data storage, e.g. suscriber profiles, current MSC

    (HLR, AuC, EIR / VLR)

    User interface and Radio interface

    Service control

    User Identity Module (SIM, unique identification of user)

    Core Network (CN)

    Mobile Station (MS)

    receive / send data from / to MS via radio link (BTS)

    control Radio specific signaling (BSC)

    Radio resource management (BSC)

    Transcoding and rate adaptation (TRAU)Transform e.g. voice coding from one digital format

    into another one, e.g. ISDN to GSM

    Um

    A

    BSC

    BTS

    BTS

    BTS

    BTS

    MSC

    GMSC

    VLR HLR

    AuC

    EIR

    TRAU

    Packet Data

    NetworksISDN GSMPSTN

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 8

    UMTS architecture basics Principles ofnetwork architectures

    Forcomparison:GSMarchitecture

    Forcomparison:GPRSarchitecture

    Conceptual UMTSarchitecture

    UE UTRAN

    PSDomain

    CSDomain IMS

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 9

    GSMis acircuit switchednetwork

    since anoverall increase ofdata trafficis expected,GSMwasevolvedtobecome more flexible->GPRS (GeneralPacketRadioService)

    GPRSis called 2.5Generation

    GPRSadds technologyfor supporting data traffic:

    apacketswitched domain tothe core network

    ashared channel onthe radio link

    shared channel means several users share the same radio channel

    asopposed toadedicated channel asinGSMmore efficient usage ofresources,because ofstatistical multiplexing

    Allapplications share the same resource

    Efficient for applications with variablerates

    Can take away resources from each other

    higher transmission rates (max 171,2kb/s) GSMoriginally hasupto14,4kb/s

    With EDGE384kb/spossible

    allows adirect connection toe.g.the Internet

    charging perdata volume possible

    inGSMalways charging pertimeunit

    For comparison: GPRS

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 11

    UMTS architecture basics Principles ofnetwork architectures

    Forcomparison:GSMarchitecture

    Forcomparison:GPRSarchitecture

    Conceptual UMTSarchitecture

    UE UTRAN

    PSDomain

    CSDomain IMS

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 12

    Add anew radio access network,the UTRANUTRAN- UMTSTerrestrial RadioAccessNetwork

    UTRANandGSMradio access network can coexist and

    connect tothe same Core Network

    The CSDomain may alsobe based onpacketbased transport slow evolution towards all-IP-- may be some day abandon the circuit

    switched domain alltogether

    Introduction ofthe IMSIMS- IPMultimediaSubsystem

    support ofIP-based multimedia services

    multimedia services are e.g.

    Video,voice,possibly simultaneously with data etc.

    e.g.IMSvitalfor locating IP-address ofaddressees

    the PSdomain justprovides QoS,

    it does notprovide multimedia services (app.layer)

    the PSdomain serves asaccess system tothe IMS

    the IMSinprinciple is access-system independent(alsoETSIis interested)

    the PSdomain hides mobility from the IMS

    UMTS - Main changes from GPRS

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 13

    UMTS basic network architecture

    External Networks (Internet, PSTN,...)

    UMTS RadioAccess

    Network

    (UTRAN)

    Core Network (CN)

    packet

    switched

    domain

    PS domain

    circuit

    switched

    domain

    CS Domain

    User Equipment (UE)

    IP Multimedia

    Subsystem (IMS)Gi

    Iu-ps

    Iu-cs

    Gi

    Base StationSubsystem

    from GSM

    Gb

    A

    Radio Access Network (RAN)

    Radio link between UTRAN and UE is

    called UTRA

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    WS 04/05, TKN TU Berlin, Cornelia Kappler Course UMTS Networks, III. UMTS Architecture 14

    Summary The mobilenetworks we are looking atconsist of

    UE/MS,RANandCN

    they provide access toexternal networks

    GSMis circuit switched

    GPRSadds support for packetswitching

    UMTSevolves from GPRSby adding anew RAN

    adding the IMS

    AUMTSNetworkconsists of UE

    UTRAN

    Core Network(CSDomain,PSDomainandIMS)