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AnnexH H323 Mobile Proposal

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AnnexH H323 Mobile Proposal ...

MTD-05c

Question: Q.13 interim Ad-hoc meeting Nov. 17, 1999

     *SOURCE: Motorola (Contribution)

TITLE: Integrating 3GPP's option-1 architecture into the H.323 wireless IP

    mobility system and a full migration from GPRS to a Multimedia IP

    network proposal

SUBJECT: Enhancements to ITU-T Recommendation H.323 to support User,

    Terminal and Service Mobility

The present contribution outlines the system architecture, and the reference configurations which

    are necessary for:

? The delivery of telephone calls which originate in an GPRS and/or wireless IP network and

    are delivered to Switched Circuit Networks (SCN), such as Public Switched Telephone

    Network (PSTN), Integrated Services Digital Networks (ISDN) and Global System for

    Mobile communication (GSM) networks (Scenario 1).

    ? The delivery of telephone calls which originate in SCNs and are delivered in an GPRS

    and/or wireless IP network (Scenario 2).

    ? The delivery of telephone calls which originate in SCNs, routed through a GPRS and/or

    wireless IP network and finally delivered to an SCN (Scenario 3).

    ? The delivery of telephone calls which originate in GPRS and/or IP networks, routed through

    an SCN and finally are delivered to an IP network (Scenario 4).

    These four call scenarios part of the basic requirements. The present contribution is applicable to

    equipment performing the roles of a mobile terminal, fixed PC terminal, Gateway GPRS Support

    Node (GGSN), Serving GPRS Support Node (SGSN), Signalling Gateway, Gatekeeper and

    Gateway.

Table of Contents:

    Definitions ............................................................................................................................................... 2 References ............................................................................................................................................... 3 Abbreviations ................................................................................................................................... 3 Introduction ............................................................................................................................................. 4 Discussion ............................................................................................................................................... 4 Interworking ...................................................................................................................................... 4 Mobility management ...................................................................................................................... 4

    Roaming ............................................................................................................................................ 4 Handover ........................................................................................................................................... 4 Reference Architectures ....................................................................................................................... 5 Conclusion............................................................................................................................................... 9

* Contact Person:

    Edgar Martinez Tel: 1-847-632-5278 1501 W. Shure Drive. Fax: 1-847-632-6999 Arlington Heights. IL USA email: martinze@cig.mot.com

Definitions

    For the purposes of the present contribution, the following terms and definitions apply:

Gatekeeper: Entity on the IP network which provides address translation and controls access to

    the network for terminals and gateways. The gatekeeper may also provide other services to

    terminals and gateways, such as bandwidth management and gateway location.

Gateway: A gateway is an endpoint on a network which provides for real-time, two-way

    communication between terminals on an IP based network and other terminals on switched circuit

    network.

    Media Gateway: Provides the media mapping and/or transcoding functions.

    Media Gateway Controller: Controls the Media Gateways.

    Telephone call: Two-way speech communication between two users by means of terminals connected via network infrastructure.

    Signalling Gateway: Provides the signalling mediation function between the IP domain and the SCN domain.

Terminal: An H.323 terminal other than a gateway or a multipoint control unit.

    existing service: services supported in Release 99 and earlier releases for both GSM and UMTS.

    All IP core network: core network of release 2000 that uses IP for transport of all user data and signalling.

ERAN is defined as an evolved GSM BSS supporting EDGE modulation schemes on a 200kHz

    basis and real time packet services.

Public Land Mobile Network: is established and operated by an administration or Recognised

    Private Operating Agency (RPOA) for the specific purpose of providing land mobile

    telecommunications service services to the public. A PLMN may be regarded as an extension of

    a network (e.g. ISDN); it is a collection of MSCs areas within a common numbering plan (e.g.

    same National Destination Code) and a common routing plan. The MSCs are the functional

    interfaces between the fixed networks and a PLMN for call set-up. Functionally the PLMNs may

    be regarded as independent telecommunications entities even though different PLMNs may be

    interconnected through the ISDN/PSTN and PDNs for forwarding of calls or network information.

    A similar type of interconnection may exist for the interaction between the MSCs of one PLMN.

Serving GPRS Support Node: The location register function in the SGSN stores subscription

    information and location information for Packet Switched (PS) services for each subscriber

    registered in the SGSN. The SGSN is needed only in a PLMN which supports GPRS.

    GPRS Support Nodes: The UMTS PS-services support nodes, Gateway GSN (GGSN) and Serving GSN (SGSN) constitutes the interface between the radio system and the fixed networks

    for packet switched services. The GSN performs all necessary functions in order to handle the

    packet transmission to and from the mobile stations.

Equipment Identity Register: The Equipment Identity Register (EIR) in the GSM system is the

    logical entity which is responsible for storing in the network the International Mobile Equipment

    Identities (IMEIs), used in the GSM system. The equipment is classified as "white listed", "grey

    listed", "black listed" or it may be unknown as specified in TS 22.016 and TS 29.002.

References

    [1] DTR/TIPHON-07001 Analysis of existing roaming techniques applicable to TIPHON

    mobility

    [2] DTR/TIPHON-07002 Investigation of synergies and common requirements between

    TIPHON networks and wireless systems as they are currently being developed by other

    bodies.

    [3] DTS/TIPHON-07003 Mobility and Access to Wireless Systems; Extensions to

    Requirements, Architecture and Protocols.

    [4] DTS/TIPHON-02003 v0.3.0 Network architecture and reference configurations; Phase III:

    Scenario 1 + Scenario 2 + Scenario 3 + Scenario 4

    [5] ITU-T Recommendation H.323 (1998): "Packet-based multimedia communication".

    [6] 3rd Generation Partnership Project; Technical Specification Group Services and

    Systems Aspects; Architecture for an All IP network (3G TR 23.922 version 1.0.0)

    [7] 3rd Generation Partnership Project; Technical Specification Group Services and

    Systems Aspects; Network architecture (3G TS 23.002 version 3.1.0)

    Abbreviations

    For the purposes of the present document, the following abbreviations apply: CAP Capabilities Application Part

    CN Core Network

    CSCF Call State Control Function

    EDGE Enhanced Data for GSM

    FFS For Further Study

    GGSN Gateway GPRS Support Node

    GK GateKeeper

    GPRS General Packet Radio Service

    GSM Global System for Mobile communications GW Gateway

    HSS Home Subscriber Server

    IP Internet Protocol

    MCU Media Control Unit

    MG Media Gateway

    MGC Media Gateway Controller

    MGCF Media Gateway Controller Function

    MGW Media Gateway

    MRF Media Resource Function

    MT Mobile Terminated/Terminal

    PLNM Public Land Mobile Network

    PS Packet Switched

    PSTN Public Switched Telephone Network

    R00 Release 2000

    R99 Release 1999

    R-SGW Roaming Signalling Gateway

    SCP Service Control Point

    SG Signalling Gateway

    SGSN Serving GPRS Support Node

    TE Terminal Equipment

    T-SGW Transport Signalling Gateway

    UTRAN UMTS Terrestrial Radio Access Network VoIP Voice over IP

Introduction

    A recently approved 3GPP feasibility report TR 23.xyz v.0.1. was considered for this contribution ndespecially section 5 which illustrated two architectural options, the 2 option seems to be closest

    to a IP type of architecture. This contribution tries to address an alternated option to 3GPP's

    option 2 of IP architecture.

    Discussion

    rdThe aim of the all IP architecture is to allow operators to deploy IP technology to deliver 3

    Generation services, that is an architecture based on packet technologies and IP telephony for simultaneous real time and non real time services. This architecture should be based on an evolution from Release 99 specifications and should be compatible with IMT-2000, providing global terminal mobility (roaming) [TS 22.101 version 3.6.0: Service Principles].

    The IP network should provide wireless mobility access based on ERAN and UTRAN with a common core network, based an evolution of GPRS, for both. In this context, an E-GPRS radio access network is a 200kHz GSM based network supporting EDGE and evolved to support real time packet services. Although EDGE is not within the scope of 3GPP, there are requirements for the core network of the all IP architecture, to be common to both access technologies.

The characteristics of this network are:

    ? Based on an evolution of GPRS

    ? Common network elements for multiple access types including UTRAN and ERAN ? Packet transport using IP protocols

    ? IP Client enabled terminals

    ? Support for voice, data, real time multimedia, and services with the same network elements.

    The report also covers the support of CS services on IP technologies. The benefits of this approach include:

    ? Ability to offer seamless services, through the use of IP, regardless of means of access (e.g.

    common features used by subscribers whether accessing via conventional land telephony,

    cable, wireless, HIPERLAN 2 etc.)

    ? Synergy with generic IP developments and reduced cost of service

    ? Efficient solution for simultaneous multi-media services including voice, data, and advanced

    real time services.

    ? Higher level of control of services

    ? Integrated, and cost reduced OA&M through IP

    ? Take advantage of Internet applications by supporting terminals which are IP clients. ? Cost reduction through packet transport

    Interworking

    The All-IP core network shall support interworking to external IP and non-IP networks (e.g. circuit-switched networks (PSTN, ISDN, GSM PLMN, UMTS PLMN,...).

    Mobility management

    The All-IP core network shall provide streamlining and CN operated hand-over procedures for UMTS.

    Roaming

    The standard shall enable the All-IP core network to support roaming with 2G GSM/GPRS networks and R99 UMTS networks.

    Handover

    The support of handover between release 98, release 99 and release 2000 network technologies is essential in maintaining adequate network coverage.

Reference Architectures

    [6]The original 3GPP reference architecture provided two options.

    The GPRS network part has the GSNs which provide the mobility management and the PDP context activation services to the mobile terminal as they do in the R99 GPRS PS domain network. The HLR functionality for the GPRS network is provided by the Home Subscriber Server, (HSS).

    The Call Control part of the architecture is the most critical functionality. The CSCF, MGCF, R-SGW, MGW, T-SGW and the MRF comprise the Call Control and signalling functionality to deliver the real-time mobile/wireless services. The CSCF is similar to the H.323 GateKeeper or a SIP Server. The architecture has been intentionally kept generic and is not based on a specific call control mechanisms such as H.323 or SIP. Such a choice is for further study.

    The user profiles are maintained in the HSS. The signalling to the multimedia IP network is interface solely via the CSCF while the bearer is interfaced directly with the GGSN. The MRF interfaces with all bearer components for bearer media and with the CSCF for signaling. The MRF provides for media mixing, multiplexing, other processing and generation functions.

    The interconnectivity to external networks such as PLMN, other PDNs, other multimedia VOIP networks and 2G Legacy networks (GSM or TDMA) is supported by the GGSN, MGCF, MGW, R-SGW and T-SGW functional elements. Other PLMNs are interfaced for both bearer and signalling via their respective GPRS components. The CSCF is a new component which also participates in this signalling. The signalling to legacy mobile networks is interfaced via the R-SGW, CSCF, MGCF, T-SGW and HSS, while the bearer is interfaced to and from the legacy PSTN network via an MGW. Legacy landline circuit switch signalling is interfaced via the CSCF, MGCF and T-SGW while the bearer is interfaced to and from the legacy PSTN network via an MGW.

Option 1: has been developed with the goal of allowing operators to deploy an all IP based rdarchitecture to deliver 3 Generation wireless/mobile services. This architecture is based on

    packet technologies and IP telephony for simultaneous real time and non real time services. The

    reference architecture shown figure 1 is take the from 3GPP technical requirements. See 3G TR [6]23.922 version 1.0.0 for full details of option 1.

    Applications &Other PLMNHSSServices

    GGSNSCPCxEIRGp

    CAPLegacyGfMobileCSCFR-SGWNetworkMsUTRANMrTEMTSGSNIuRUuMgMRF

    GnERANMTTEIu-ps Gi

    RUmGiT-SGWMGCFPSTN/Legacy/ExternalMc

    Signalling InterfaceGGSNMGWGiGiSignallingand

    Data Interface

    Multimedia IP Network

    Ref: 3G TR 23.922 version 1.0.0 (1999-10)

    Reference Architecture Option 1.

    For simplicity, only the 3GPP interfaces relevant to H.323 interfaces are shown for discussion.

    Alternate Proposal for an all IP option for 3GPP R'00:. The purpose the all IP proposal is also to allow support of release 99 CS domain terminals. In addition it will also support the IP based services of option 1.

    Applications &Other PLMNServices

    GGSNSCPHSSEIRCxCAPGfGpLegacyR-SGWCSCFMobileSGSN( GK )( SG1 )Network( GK )MsSGSNGn

    Iu-iH.323MgTerminalUTRANTEMTT-SGWMrMGCFRIu-ps Uu( SG( MGC )MRF2 )PSTN/GnGi( MCU )McLegacy/External

    Gi

    MGWGGSN

    ( MG )GiGi

    ERANMTTE

    Signalling InterfaceRUmMultimedia Signalling/Data/VoIPIP Network GPRS Signalling & Data

    H.323 Elements ( X )Sigtran ( SGx )Alternate proposal for 3GPP R?0 Option 2.

    For details on the G's, Iu's, Cx and M's interfaces see (3G TR 23.922 version 1.0.0).

    Full migration from GPRS to Multimedia IP network:. Based on the proposed diagram for an Alternate all IP option for 3GPP R'00 the migration to a full IP solution can be realised if the MG

    could support the Gn interface. It also becomes obvious, that if the ERAN Iu could support pure

    data over IP, it could be also connected to the IP Multimedia Network directly.

    Applications &Legacy PLMNServicesWireless & FixedGGSNSCPHSSMultimediaEIRIP NetworkCxCAPGpGf

    LegacyR-SGWMobileSGSNCSCFSGSN( SG1 )Network( GK )( GK )MsGn Iu-iIu-iH.323MgTerminalERANUTRAN

    MrGiT-SGWMGCF

    MRF2 )( SGPSTN/Gi( MGC )Gn( MCU )Legacy/ExternalMc

    Gi

    GGSN + MGW( MG )

    Signalling Interface

    Signalling/Data/VoIPGPRS Signalling & Data

    H.323 Elements ( X )Sigtran ( SGx )Full GPRS Migration to the IP Multimedia Network.

    Not shown in diagram for simplicity, the ERAN and UTRAN interfaces, Uu and Um will still be

    supposed.

Proposed Universal IP Network solution

     Proposal - Universal H.323 Interoperability with PSTN, PLMN and IP Wireless Mobility

    Scope ofIP Wireless MobilityBES

    LNPHLFVLF

    H.323H.323H.323GatekeeperMCUTerminal

    Packet Based Network

    (Note)

    H.323GGSNSS7BTS orH.323GatewayGatewayIP-RANGateway

    SCPHLR

    GPRS DataSS7CS Voice/DataCS Voice/DataGpNon-H.323 H.323 MobileNetworkTerminalMobile Terminal

    LegacyCS Voice/DataGPRSPSTNMSC

    MobileTerminalRANBSC

    TerminalAnalogBRIPBXPhones

    Non-H.323 Mobile Terminal

    NOTE ?The IP-RAN (UTRAN and or ERAN) may support one or more types of Non-H.323 Mobile Terminals

    Conclusion

    The H.323 mobility group should also consider the interworking of the GPRS network and provide

    a GPRS migration path to a full IP network solution. Such as the work in H.323 is providing an

    interworking and migration path for the PSTN to a full IP network solution. In addition the H.323

    mobility group could include the two options the Alternate Proposal for an all IP option for 3GPP

    R'00 (interim) and the full migration from GPRS to Multimedia IP network into H.323 Annex-H

    interworking sections. Further details can be discussed within the H.323 mobility group.

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