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TITLE: Legacy MS Domain Step 1

DATE: February 4, 2002
SOURCE:

|Serge Manning |[pic] [pic] |
|15405 College Blvd. | |
|Lenexa, KS 66219 | |
|Phone: 913-890-4253 | |
|Email: smanni05@sprintspectrum.com | |

ABSTRACT: This contribution proposes a fresh document as a starting point for development of the LMSD that leverages existing published standards whenever possible. It is applicable to Step 1 of the LMSD.

RECOMMENDATION:

Discuss and adopt as the foundation for N.P0023/PN-4934. | | |
|[pic] | |

TSG-N TR-45.2 N.P0023 PN-4934 (to be published as TIA/EIA/IS-872)

Chair: Betsy Kidwell Chair: Terry Watts Lucent Technologies SBC Technology Resources 263 Shuman Boulevard 9505 Arboretum Boulevard Naperville, Illinois 60566 Austin, Texas 78759 630-979-2272 fax 630-979-1921 512-372-5844 fax 512-241-5844 ekidwell@lucent.com terry.watts@cingular.com

IP Network for cdma2000 Spread Spectrum Systems
3GPP2 All-IP Core Network
Enhancements For

Legacy MS Domain

|Restrictions: |
|3GPP2 and its Organizational Partners claim copyright in this document and individual Organizational Partners may copyright and issue |
|documents or standards publications in individual Organizational Partner's name based on this document. Requests for reproduction of |
|this document should be directed to the 3GPP2 Secretariat at “secretariat@3gpp2.org”. Requests to reproduce individual Organizational |
|Partner's documents should be directed to that Organizational Partner. See “www.3gpp2.org” for more information. |
|_______________ |
|The contributor grants a free, irrevocable license to the Telecommunications Industry Association (TIA) to incorporate text contained in |
|this contribution and any modification thereof in the creation of TIA standards publication; to copyright in the TIA’s name any TIA |
|standards publication even though it may include portions of this contribution; and at TIA’s sole discretion to permit others to |
|reproduce in whole or in part the resulting TIA standards publication. |
|This document represents “working papers.” Therefore, the contents cannot be viewed as reflecting the corporate policies or the views of |
|the Telecommunications Industry Association or of any company. The Association, the companies and individuals involved, take no |
|responsibility in the application of this document. Copyright © 2001 Telecommunications Industry. |
|Copyright © 2002 Telecommunications Industry. |
CONTENTS

LIST OF FIGURES iii

PREFACE iii

REVISION HISTORY iv
1 3GPP2 NAM Stage 1 1
2. LMSD Step 1 System Requirements. 2 3.4 Legacy MS Domain Support Control and Bearer View 41

REVISION HISTORY

|Revision |Date/Contribution |Description/Title |Source |
|0.0 |February 4, 2002 |Initial revision |Sprint PCS |

Scope

This recommendation is intended to support the 3GPP2 All-IP Step-1 Evolution Path by providing Stage-1, 2, and 3 for the architecture identified in Figure 2.1 "Legacy MS Domain Control and Bearer View for IP Call Delivery".

The Legacy MS Domain provides support for existing MSs (e.g., analog, IS-95-A, IS-95-B, IS-2000) in an IP core network environment. This domain supports the features and capabilities provided in a legacy network in a manner transparent to the user. New features and capabilities supported by the IP core network may be made available to subscribers where they are supported by the MS capabilities.

The new functionality being focused upon is the MSCe-to-MSCe IP signaling interface-"zz" and the Media Gateway-to-Media Gateway bearer streams interface-"yy" used for legacy voice call Call Delivery.

1.1 References

3GPP2 • S. P0059 3GPP2 Legacy MS Domain System Requirements • S.P0037 3GPP2 All-IP Network Architecture Model version 1.1.1.

IETF • Internet Engineering Task Force, RFC 2543 – SIP: Session Initiation Protocol.

TIA/EIA-41 • ANSI/TIA/EIA-41-D, Cellular Radiotelecommunications Intersystem Operations, December, 1997. • TIA/EIA/IS-737, IS-41-C Enhancements to Support Circuit Mode Services, (approved for publication). • << Proper ref to TIA/EIA/IS-880 (PN-4720)>>

LMSD System Requirements:

This section contains applicable extracts from the 3GPP2 Legacy MS Domain System Requirements (see S. P0059).

The LMSD Step-1 provides support for legacy MS such that they can receive the same features using the LMSD that they receive in legacy systems. Such features include, but are not limited too, the features defined in TIA/EIA-664A and beyond.

Enhancements beyond legacy systems include:

• separation of the MSC into a MSCe and MGW/MRFP and

• specification of interfaces xx, yy, zz, and 39 (see Figure 2.1).

1 General Requirements

Existing TIA/EIA-41 signaling will be used for call control, services, and handoff.

Existing IOS 4.1 specifications will be used for RAN connectivity.

Existing air-interface specifications will be used.

Existing P.S0001 specification will be used for cdma2000 packet data services

2 New Network Entities

1 MSCe

Has the signaling and call control aspects of a MSC.

Uses TIA/EIA-41 for call control and service signaling.

Uses IP signaling to control the MRFP for tones and announcements.

Uses IP signaling to control the MGW for bearer establishment.

Uses IP signaling to control the MGW for bridging control.

Uses IP signaling for bearer management control associated with interface yy.

For Call Delivery, the MSCe translates a received E.164 TLDN into an IP address when IP bearer is to be used.

2 MGW/MRFP

Has the bearer aspects and switching fabric of a MSC.

Has the tone and announcement capabilities of a MSC.

Has the bridging capabilities of a MSC.

Supports IP bearer for Call Delivery to other LMSDs.

Supports circuit bearer for connectivity to the PSTN.

Uses IP signaling from the MSCe for tones and announcements control.

Uses IP signaling from the MSCe for bearer establishment.

Uses IP signaling from the MSCe for bridging control.

Interface 33 between MGW and MRFP is not specified in LMSD Step-1, but is subject for future development.

New Interfaces

3 Interface 39

Provides IP signaling from the MSCe to the MGW/MRFP to control bearer resource assignment.

Provides IP signaling from the MSCe to the MGW/MRFP to control bridging.

4 Interface xx

Provides IP signaling from the MSCe to the MGW/MRFP to control insertion of tones and announcements into the bearer stream.

5 Interface yy

Provides IP bearer between MGW/MRFPs

6 Interface zz

Provides IP signaling control associated with interface yy. This interface is between MSCes.

Legacy MS Domain Stage-2:

This section contains “Legacy MS Domain” Stage-2 architecture, interface definitions, detailed descriptions of entities, and message flow scenario recommendations that support the Stage-1 requirements.

1 LMSD Architecture

This section contains “Legacy MS Domain Support” applicable extracts from the 3GPP2 All-IP NAM (Network Architecture Model) Revision 1.1.1 with modifications agreed in TSG-N for NAM Revision 1.1.2.

The entities not in bold in the figure below are network components that exist in legacy networks. Interfaces marked with unbolded lines indicate interfaces that exist in legacy networks and are based entirely on existing standards. The entities in bold are new to LMSD (LMSDS, MGW/MRFP) and interfaces using bold lines (39, xx, yy, zz) indicate new interfaces in LMSD. These new interfaces may be based on existing standards and are specified in this document.

[pic]

Figure 2.1 Legacy MS Domain Step 1 ArchitectureSupport for
Circuit Mode IP Transport Call Delivery

2 Interface Definitions

This section defines the various interfaces that are part of the Legacy MS Domain. The majority of the interfaces conform to existing published standards as indicated. Interface details beyond those stated in published standards specific to the Legacy MS Domain are included in this document.

1 LMSDS to ANSI-41 Network Signaling (14)

This interface conforms with ANSI-41Revision D, Cellular Radio Telecommunications Intersystem Operations as well as IS-880.

This document does not make any changes to this existing interface.

2 LMSDS to PSTN Signaling (26)

This interface conforms with ISUP messaging over SS7 as defined by :

• ITU-T Recommendation Q.763, Q.765, <<??????>>.

• ANSI ISUP T1.113 (TCAP T1.114, SCCP T1.112)

This document does not make any changes to this existing interface.

3 Media Gateway to RAN Voice Bearer (27-A2)

This interface conforms to A2 link specified in TIA/EIA/IS-2001,Inter-operability Specification (IOS) for CDMA 2000 Access Network Interfaces.

This document does not make any changes to this existing interface.

4 Media Gateway to RAN Circuit Data Bearer (27-A5)

This interface conforms to A5 link specified in TIA/EIA/IS-2001,Inter-operability Specification (IOS) for CDMA 2000 Access Network Interfaces.

This document does not make any changes to this existing interface.

5 Media Gateway to PSTN Bearer (34)

This interface is a switched circuit network bearer carrying PCM encoded voice as specified in <<????>>.

This document does not make any changes to this existing interface.

6 LMSDS to Media Gateway Signaling (39)

This interface is based on RFC 3015, Megaco Protocol version 1.

1 Protocol Stack

The following protocol stack is used for this interface.

2 Megaco Package Support

The following table lists the Megaco packages supported on this interface.

Table XX: Megaco Package Support
|Package Name |Reference |Comments |
|Generic. |RFC 3015, Annex E.1 |Basic set of properties. |
|Base Root |RFC 3015, Annex E.2 |Defines global MGW attributes. |
|[…] | | |

7 LMSDS to Media Resource Function Processor (xx)

This interface is based on RFC 3015, Megaco Protocol version 1.

1 Protocol Stack

The following protocol stack is used for this interface.

2 Megaco Package Support

The following table lists the Megaco packages supported on this interface.

Table XX: Megaco Package Support
|Package Name |Reference |Comments |
|Generic. |RFC 3015, Annex E.1 |Basic set of properties. |
|Base Root |RFC 3015, Annex E.2 |Defines global MGW attributes. |
|[…] | | |

8 LMSDS to RAN Signaling (48-A1)

This interface conforms to A1 link specified in TIA/EIA/IS-2001,Inter-operability Specification (IOS) for CDMA 2000 Access Network Interfaces.

This document does not make any changes to this existing interface.

9 Media Gateway to Media Gateway IP Bearer (yy)

This interface is based on IP bearer streams using RTP/UDP/IP as defined in:

• RFC 1889, Real Time Protocol (RTP) • RFC 768, User Datagram Protocol (UDP) • RFC 791, Internet Protocol

1 Protocol Stack

The following protocol stack is used for this interface.

2 RTP Profiles

The following RTP profiles are supported for this interface.

10 LMSDS to LMSDS IP Signaling (zz)

TBD

3 Legacy MS Domain Entity Descriptions

This section contains detailed descriptions for entities in the Legacy MS Domain as well as the interfaces supported by each entity. The behavior of entities conforms to existing published standards where indicated. Behavior details beyond those stated in published standards specific to the Legacy MS Domain are included in this document.

This information forms the basis for the Stage 2 message flows later in this document.

1 Legacy MS Domain Support

This entity consists of a collection of the Network Architecture Model components:

• Mobile Switching Center Emulation (MSCe) • Home Location Register Emulation (HLRe) • Signal Control Point Emulation (SCPe)

This entity supports the following interfaces:

• LMSDS to ANSI-41 Network Signaling (14) • LMSDS to PSTN Signaling (26) • LMSDS to Media Gateway Signaling (39) • LMSDS to Media Resource Function Processor Signaling (xx) • LMSDS to RAN Signaling (48-A1) • LMSDS to LMSDS IP Signaling (zz)

This entity has the following capabilities:

• Processes mobility management and call control messages from the ANSI-41 network and mobile stations for mobile originated and mobile terminated calls. • Controls the establishment of voice bearers between Access Network and Media Gateway as well as the establishment of voice bearers between Media Gateway and the PSTN. • Performs the functionality of the Visitor Location Register (VLR). • Performs authentication of mobile stations.

2 Media Gateway and Media Resource Function Processor

This entity consists of a collection of the Network Architecture Model components:

• Media Gateway (MGW) • Media Resource Function Processor (MRFP)

This entity supports the following interfaces:

• Media Gateway to RAN Voice Bearer (27-A2) • Media Gateway to RAN Circuit Data Bearer (27-A5) • Media Gateway to PSTN Bearer (34) • LMSDS to Media Gateway Signaling (39) • LMSDS to Media Resource Function Processor Signaling (xx) • Media Gateway to Media Gateway IP Bearer (yy)

This entity has the following capabilities:

• Terminates bearer channels from the PSTN on interface 34, bearer channels from the radio network on interfaces 27-A2 and 27-A5, and media streams from a packet network on interface yy. These are called network terminations. • Performs the functions of a “media gateway” as defined in RFC 3015 but is limited to supporting voice and circuit data media streams on these network terminations. • Provides switching of the bearer channels by connecting media streams from one set of network terminations to another set of network terminations. • Converts media in one type of network termination to the format required in another type of network termination. • Is controlled by an external entity via interface 39 and interface xx as defined in RFC 3015. • Uses the Media Gateway to Media Gateway IP bearer via interface yy to deliver calls received at one LMSD system that terminate at another LMSD system. The IP bearer is used in place of an inter-MSC trunk. • Performs the functions of the Interworking Function (IWF) as specified in IS-707.X between interfaces 27-A5 and 34. • Injects audio announcements, tones, and performs media conferencing among media streams.

4 Legacy MS Domain Scenarios

This section documents the main Stage-2 scenarios for Legacy MS Domain operation. These scenarios are described using text description as well as information flow diagrams. The scenarios described in this section are meant to provide a high level Stage-2 information flow understanding and are not intended to be exhaustive.

1 Mobile Origination Scenarios

1 Mobile Origination (Home) to PSTN

2 Mobile Origination (Roaming) to PSTN

[…]

2 Mobile Termination Scenarios

1 PSTN to Mobile Termination (Home)

2 PSTN to Mobile Termination (Roaming)

[…]

3 Call Delivery over IP Bearer Scenarios

1 Mobile Origination (System 1) to Mobile Termination (System 2)

[…]

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...A Storybook Relationship Every day the world presentsobstacles to overcome burdened by vast emotions carried inside that person that demand acknowledgment and closure. I can remember the consumption of those emotions and feeling the weight of the world on my shouldersas my soul,famished from interaction,wailed for a release. Yearning to vent yet demanding a method to protect my most valuable possession, my mind. I opened a door to unsurpassed wonder.A relationship that I was able to flow with emotions unbridled, without fear of discovery. Days passed, then weeks, and one day the realization came that years were gone but each moment lived on shared and captured, escaping the prison of time. Easily now I shed my armor and poured out my ramblings to an open book that consume all my inequities and reinvigorated my goals.These moments that I share in this special relationship shape me to grow from the past and prepare for the future. Unfettered,capabilities to share my innermost thoughts allowed captivated watch as I begin to blossom into a mature strong being able to stand back and marveled as the story unfolded. A connection so powerful that others long for the ability to have their words caressed and accepted. My aptitude to cope with the grind of life increased as the pages filled up. The ivory shelf above my bed cradled the secret books housing the foundation of character built over the years, strengthen by an everlasting, unbreakable, and irreplaceable bond.Each page of my journal...

Words: 957 - Pages: 4