01 WCDMA Core Network Overview ISSUE1.0

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  • HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

    www.huawei.com

    Internal

    WCDMA Core Network

    Overview

    ISSUE 1.0

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    Chapter1 Core Network Evolution

    Chapter2 R99 Core Network

    Chapter3 R4 Core Network

    Chapter4 R5 Core Network

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    Definition of Core Network CN includes a series of physical entities to realize user location

    management, network function and service control, such as (G)MSC, HLR,

    SCP, SMC,GSN etc.

    CN can be divided into three types: Home Network Domain, Transit Network

    Domain and Transit Network Domain. Ref. is 3GPP 23.101.

    User Equipment Domain

    Access Network Domain Core Network Domain

    Infrastructure Domain

    Cu

    Mobile

    Equipment

    Domain

    USIM

    Domain

    Home

    Network

    Domain

    Transit

    Network

    Domain

    Uu Iu

    [ Zu]

    [ Yu]

    Serving

    Network Domain

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    Release Evolution of WCDMA

    R4

    R5

    R99

    Inherit all the services and

    functions of 2G ( GSM

    and GPRS )

    CN is composed of CS

    domain and PS domain

    Adopt WCDMA UTRAN

    Iu interface between RAN

    and CN is based on ATM

    Inherit all the services and

    functions of R99

    CS domain change: control is

    separated from bearer, the

    function of MSC can be fulfilled

    by MSC SERVER and MGW.

    Packet voice supported by CS

    domain, supporting ATM, IP,

    TDM bearer

    Inherit all the services

    and functions of R4

    IM domain is adopted

    RAN evolved to IP

    Enhanced IP QoS ability ,

    supporting end to end IP

    multimedia service

    2000 2001 2002 function frozen time

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    Questions

    What functions can CN provide?

    What is the WCDMA first version? How about the features?

    Which domain in WCDMA R4 can implement the function of

    control separated from bearer?

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    Chapter1 Core Network Evolution

    Chapter2 R99 Core Network

    Chapter3 R4 Core Network

    Chapter4 R5 Core Network

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    R99 Network Architecture

    BSS

    BSC

    RNS

    RNC

    CN

    Node B Node B

    A IuPS

    Iur

    Iub

    MS

    Uu

    MSC SGSN

    Gs

    GGSN GMSC

    Gn HLR

    Gr

    Gc C

    D

    E

    AuC

    H

    EIR

    F Gf

    Gi PSTN

    IuCS Gb

    VLR

    B

    Gp

    VLR

    G

    BTS BTS

    Um

    RNC

    Abis

    MSC

    B

    PSTN

    cell

    PCU

    UE

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    R99 Network Architecture

    GSM /GPRS BSS

    BTS

    BSC

    NodeB

    RNC

    PCU

    UTRAN

    SCP

    SMS

    SCE

    PSTN

    ISDN

    Internet,

    Intranet

    MSC/VLR GMSC

    HLR/AUC

    SGSN

    CG BG

    GGSN

    GPRS/

    Other PLMN

    SS7

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    R99 Core NetworkFeatures and Technologies

    Core Network is split into CS domain and PS domain. CS domain

    is based on original GSM network. PS domain is based on

    original GPRS network.

    CS domain: used to provide Circuit-switched service. Network

    mode can support TDM, ATM and IP. Physical entities include

    switching equipment (such as MSC/VLR, GMSCs), and inter-

    working equipment (IWF).

    PS domain: used to provide Packet-switched service. Network

    mode is IP. Physical entities include SGSN, GGSN, CG , BG etc.

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    R99 Core networkFunction Entity(1)

    Function entity shared by CS domain and PS :

    HLR: to realize mobile subscriber management and

    location information management ;

    VLR: to deal with all kinds of data information of current

    mobile subscriber ;

    AUC: to store authentication information of mobile

    subscriber ;

    EIR: to store IMEI data of mobile subscriber;

    SMS: Short Message Center.

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    R99 Core networkFunction Entity(2)

    Function entity of CS domain:

    MSC: to realize switching and signaling control function of

    circuit service.

    GMSC: to realize addressing function for different network.

    GMSC and MSC can be integrated together or separated

    independently.

    IWF: integrated together with MSC, to realize inter-working

    with PLMN and ISDN, PSTN , PDN (Mainly complete

    signaling transfer function), its functions can be defined

    based on specified services and network types.

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    R99 Core NetworkFunction Entity(3)

    Function entity of PS domain:

    SGSN: to realize packet switching function, signaling

    control function and route function of packet service.

    GGSN: to realize inter-working with PS domain and

    external data network.

    CG: to realize billing function of packet service.

    BG: to realize inter-working of two GPRS network and

    guarantee the security of network.

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    R99 Core NetworkInterface(1)

    Interface between CN and RAN/BSS:

    A Interface: to realize mobile station management, base station

    management, mobility management and call processing, etc.

    Gb interface: to realize packet data transmit and mobility

    management.

    Iu-CS interface: to realize RNS management, mobility

    management and call control function.

    Iu-PS interface: its basic function is similar to Iu-CS interface.

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    R99 Core NetworkInterface(2)

    CS internal interface:

    B interface (MSC-VLR): A private interface between VLR

    and MSC. It is used for the MSC to query the current

    location information of a Mobile Station (MS) from the Visit

    Location Register (VLR), or request the VLR to update the

    current location information of the MS or is used for the

    operations of supplementary services.

    C interface (MSC-HLR): to get MSRN, the IN service

    related subscriber status and location information.

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    R99 Core NetworkInterface(3)

    D interface (VLR-HLR): used to exchange the location

    information of the MS and the subscriber management

    information.

    E interface ( between MSC): to be used for handover

    process between two MSCs.

    F interface (MSC-EIR) : to be used for EIR to verify IMEI

    status information of mobile equipment.

    G interface (between VLR): to exchange IMSI and

    authentication information when MS moves from one VLR

    to another VLR.

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    Questions

    Whats the functions of R99 core network elements ?

    Which interfaces do we have in the R99 core network ?

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    Chapter1 Core Network Evolution

    Chapter2 R99 Core Network

    Chapter3 R4 Core Network

    Chapter4 R5 Core Network

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    Chapter3 R4 Core Network

    Section 1 Networking and Interface

    Section 2 R4 Features

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    SCP

    SMS-C

    GMLC/SMLC HLR/EIR

    CAP

    MAP MAP

    MAP

    SIGTRAN

    SS7

    UTRAN

    BSS TDM

    MGW MGW

    RTP(AAL2)/AMR

    IP(ATM)

    BackBone IP network

    GSM/R99PLMN

    PSTN/ISDN VMSC Server RANAP

    BSSAP

    AAL2

    H.248

    MAP

    BICC GMSC Server

    TDM/G.711

    TDM/G.711

    R4 Network Architecture

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    R4 Core NetworkFunction Entities

    MSC Server: control layer, to realize MM (mobility

    management), CM ( call control), MGC (media gate control) .

    MGWbearer layer, to realize the exchange of voice and

    media flow, and provide all kinds sources, such as TC, EC,

    play announcement and receive DTMF.

    SG: to realize signaling transfer from MTP (SS7 transmission

    layer) to SCTP/IP (SIGTRAN transmission layer).

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    R4 Core NetworkInterface and Protocol (1)

    MGW

    Mc Mc

    Nb

    Nc

    MSC Server

    MGW

    GMSC Server

    /ISUP/TUP

    MTP3 MTP3B M3UA

    MTP2 SSCF/SSCOP SCTP

    MTP1 AAL5/ATM IP

    H.248

    SCTP UDP MTP3B

    IP SSCF/SSCOP/AAL5

    RTP AAL2 Voice

    UDP/IP ATM PCM

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    R4 Core NetworkInterface and Protocol (2)

    Mc interface ((G)MSC ServerMGW) : H.248 is adopted, to

    realize the flexible connection processing for multi call mode,

    multi media