UMTS Core ilenia/course/13-umts-core.pdf New air (radio) interface based on WCDMA access technology

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Transcript of UMTS Core ilenia/course/13-umts-core.pdf New air (radio) interface based on WCDMA access technology

  • UMTS UMTS CoreCore NetworkNetwork

    V. Mancuso, I. Tinnirello

    UMTS UMTS CoreCore NetworkNetwork

  • GSM/GPRS core networkRadio access network BSS P S

    T N

    , IS D

    N

    BTS

    BSC

    MSC

    VLR

    GMSC

    HLRMS

    GSM/GPRS NetworkGSM/GPRS Network ArchitectureArchitecture

    V. Mancuso, I. Tinnirello

    database

    IP Backbone

    Internet

    P S

    T N

    , IS D

    N

    BTS

    SGSN AuC

    EIR

    GGSN

    PCU

  • Core network (GSM/GPRS-based)Radio access network UTRAN

    UE

    Iu CS

    IurUu

    P S

    T N

    BS

    RNC MSC

    VLR

    GMSC

    HLR

    Iub

    3GPP Rel.’99 Network Architecture3GPP Rel.’99 Network Architecture

    V. Mancuso, I. Tinnirello

    Iur

    Iub

    Uu

    Gn Iu PS

    database

    IP Backbone

    Internet

    BS

    RNC SGSN AuC

    EIR

    GGSN

  • Radio access network UTRAN

    UE IurUu

    BS

    RNCIub

    2G => 3G MS => UE (User Equipment), often also called (user) terminal

    New air (radio) interface based on WCDMA access technology

    3GPP 3GPP RelRel.’99 Network Architecture.’99 Network Architecture

    V. Mancuso, I. Tinnirello

    Iur

    Iub

    Uu

    BS

    RNC New RAN architecture (Iur interface is available for soft handover, BSC => RNC)

  • Core network (GSM/GPRS-based)

    Iu CS

    P S

    T NMSC

    VLR

    GMSC

    HLR

    Changes in the core network:

    MSC is upgraded to 3G MSC

    SGSN is upgraded to 3G

    3GPP Rel.’99 Network Architecture3GPP Rel.’99 Network Architecture

    V. Mancuso, I. Tinnirello

    Gn Iu PS

    IP Backbone

    Internet

    SGSN AuC

    EIR

    GGSN

    SGSN is upgraded to 3G SGSN

    GMSC and GGSN remain the same

    AuC is upgraded (more security features in 3G)

  • Circuit Switched (CS) core networkUTRAN (UMTS Terrestrial Radio Access Network)

    P S

    T N

    MSC Server

    GMSC Server

    SGW SGW

    3GPP Rel.4 Network Architecture3GPP Rel.4 Network Architecture

    V. Mancuso, I. Tinnirello

    P S

    T N

    New option in Rel.4:

    GERAN

    (GSM and EDGE Radio Access Network) PS core as in Rel.’99

    SGW

    MGW

    SGW

    MGW

  • Circuit Switched (CS) core network

    P S

    T N

    MSC Server

    GMSC Server

    SGW SGW

    MSC Server takes care of call control signalling

    The user connections are set up via MGW (Media GateWay)

    “Lower layer” protocol

    3GPP Rel.4 Network Architecture3GPP Rel.4 Network Architecture

    V. Mancuso, I. Tinnirello

    P S

    T N

    PS core as in Rel.’99

    SGW

    MGW

    SGW

    MGW “Lower layer” protocol conversion in SGW (Signalling GateWay)

    RANAP / ISUP

    SS7 MTP IP Sigtran

  • CS core

    P S

    T N

    MGW

    HSS IMS (IP

    Multimedia

    UTRAN

    (UMTS Terrestrial Radio Access Network)

    New core network part:

    3GPP Rel.5 Network Architecture3GPP Rel.5 Network Architecture

    V. Mancuso, I. Tinnirello

    SGSN GGSN

    In tern

    et

    HSSMultimedia System)

    PS core

    GERAN

    (GSM and EDGE Radio Access Network)

  • CS core P S

    T N

    In tern

    et / o th

    er IM S

    HSS

    The IMS can establish multimedia sessions (using IP transport) via PS core between UE and Internet (or another IMS)

    IMS (IP Multimedia

    MGW

    3GPP Rel.5 Network Architecture3GPP Rel.5 Network Architecture

    V. Mancuso, I. Tinnirello

    SGSN GGSN

    In tern

    et / o th

    er IM S

    HSS

    PS core

    Call/session control using SIP (Session Initiating Protocol)

    Interworking with the PSTN may be required for some time ...

    Multimedia System)

  • Service provider Service provider

    Content provider Content provider

    New Service ConceptNew Service Concept

    V. Mancuso, I. Tinnirello

    End user End user

    Carrier provider

    all want to make profit

  • OSA is being standardised, so that services provided by different service/content providers can be created and seamlessly integrated into the 3G network (this is the meaning of “open” architecture)

    OSA means in practice:

    OSA (Open Services Architecture/Access)OSA (Open Services Architecture/Access)

    V. Mancuso, I. Tinnirello

    3G network

    API API API

    Service Creation Environment (SCE) API = Application

    Programming Interface

    (Standardised)

  • CAMEL (Customised Applications for Mobile network Enhanced Logic) is a set of “IN” (intelligent network) type functions and procedures that make operator-specific IN services available to subscribers who roam outside their home network.

    CAMEL = IN technology + global mobility

    CAMEL (2G & 3G)CAMEL (2G & 3G)

    V. Mancuso, I. Tinnirello

    CAMEL Service Environment (CSE) is a logical entity in the subscriber’s home network which processes IN related procedures

    CSE ≈ SCP in home network

  • The IMSThe IMS

    V. Mancuso, I. Tinnirello

    The IP Multimedia Subsystem

    Vincenzo Mancuso, PhD

  • The IMSThe IMS

    �The Third generation networks aim to merge two most valuable resources in communication technology, along with local PSTN networks

    �Cellular Networks

    �The Internet

    V. Mancuso, I. Tinnirello

    �Use packet switching, IP

    �The IP Multimedia Subsystem or IMS is the solution to integrate all the services that the internet provides with the cellular and other networks

    �Triple Play: coordination of voice, video and data

  • IMS ValueIMS Value--added servicesadded services

    �IMS also can provide integrated service to the user

    �Third party developed services can be provided by operators, thus developing value-added services

    �Appropriate charging for multimedia sessions,

    V. Mancuso, I. Tinnirello

    �Appropriate charging for multimedia sessions, according to the content and the service offered

  • IMS Service IntegrationIMS Service Integration

    �Problem Statement: various networks providing services have a “vertical infrastructure”

    �no horizontal links between networks

    V. Mancuso, I. Tinnirello

    �The challenge: to integrate these networks and to create new applications that would provide service to next generation networks

  • Component #1: the media Component #1: the media

    transporttransport

    �After many other services, introduction of real time voice/video on Internet

    �The 1st problem is easy: how to transmit voice/video?

    IP packets

    V. Mancuso, I. Tinnirello

    � RTP (Real-Time Protocol) is a protocol which transports an encoded multimedia stream as pieces, with a timestamp on each piece, and sends them using UDP/IP �Any encoding is permitted for voice/video with

    a Codec: MP3, ACC, MPEG4, AMR… �Several streams (voice+video) can be sent in

    parallel with the same timestamp �The timestamp is used by the receiver to play

    the voice/video in a regular way for quality � RTP is the media transport

    Codec RTP UDP

    IP

  • Component #2: session initiationComponent #2: session initiation

    � The 2nd problem is more difficult: how to initiate the call? how to know the IP- address of the called phone?

    � It is necessary to have a table which translates a symbolic name “Betty” into an IP address

    Registration of Betty’s phone and address

    V. Mancuso, I. Tinnirello

    symbolic name “Betty” into an IP address

    � Each time a terminal service is put on, it must notify its presence to update the table

    � So, thanks to an access to this table, it is possible to make the address resolution : name -> IP address

    � The control of the address table creates a tough competition…

    Registration of John’s phone and address

  • Why IMS?Why IMS?

    Solutions to make the address resolutionsSolutions to make the address resolutions

    MSN, Yahoo, AOL have designed a calling architecture hyper- centralized: 1 table worldwide, only 1 operator

    Skype promotes a hyper- decentralized architecture:

    “The introduction and development of solution like Skype is highly significant

    V. Mancuso, I. Tinnirello

    decentralized architecture: 1 table per terminal with peer-to-peer update between terminals

    as it alters the notion of telecommunications operators by making the process fully electronic“ IDATE - ART, 2004

    Operators dislike such approaches, so they push a way very similar to e-mail: centralization per domain. This approach is named “Internet Protocol Multimedia Subsystem”, IMS.

  • IMS User IMS User Identities Identities

    zzeb@tmobile.co

    Sip:zehan.zeb@newstore.com

    tel:+17324567888

    V. Mancuso, I. Tinnirello

    zzeb@tmobile.co m