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1 MMD Evolution June 28, 2005

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Page 1: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

1

MMD Evolution

June 28, 2005

Page 2: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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Outline

• MMD Basics

• End-to-End Example– Packet Switched Video Telephony

• Transition to MMD

• Legacy MS Domain Evolution

• MMD Evolution

• 3GPP2 Project Roadmap.

Page 3: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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Introduction

• 3GPP2 defines core standards for VoIP and multi-media services– Not just a replacement for circuit-switched voice– Other example services: voice/video conferencing,

PTT, Presence and Instant Messaging.• CDMA2000 packet network standards build on

results from the IETF and IMS-related standards from 3GPP

• 3GPP2 All-IP network is comprised of two domains:– Legacy MS Domain (LMSD)– Multimedia Domain (MMD.)

Page 4: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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LMSD

• The Legacy MS Domain provides support for existing mobiles (e.g., analog, IS-95-A, IS-95-B, IS-2000) with an IP core network.

• The Legacy MS Domain supports the features and capabilities provided in a legacy network in a manner transparent to the user.

• LMSD supports Transcoder Free Operation (TrFO) and Remote Transcoder Operation (RTO) operations.

Page 5: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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Multi-Media Domain

• Multi-Media Domain (MMD) provides support for SIP capable mobile stations in an IP core network environment.

• MMD supports multimedia sessions to and from SIP-capable mobile

• MMD defines interworking with circuit switched networks via Media Gateways.

Page 6: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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IP Multimedia in 3GPP/3GPP2

• 3GPP/3GPP2 standards for IP Multimedia services– IP Multimedia Subsystem (IMS) in 3GPP–Multimedia Domain (MMD) in 3GPP2 (IMS plus CDMA

packet data transport and enhancements for CDMA operation.)

–3GPPs decided to harmonize IMS. Now nearly identical at IMS level.

• Regulatory issues are being addressed – (VoIP surveillance, tax structure for internet services, emergency calling

and position location, etc.)

Page 7: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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Control

Bearer

Called PartyVisited Network

Called PartyHome Network

Calling PartyHome Network

Calling Party Visited Network

UE

P-CSCF

HSS

S-CSCFSIP

SIP

Diameter

UE

P-CSCF

AS

HSS

S-CSCF SIP AS

SIP

Diameter

I-CSCF

Diameter

DNS

BackbonePacket

NetworkRAN

BackbonePacket

Network RAN

Initiate SIP Invitation1

1

Retrieve Subscriber Profile (if needed) 2

2

3

3 Apply Service Logic

Retrieve Address of Called Party Home Networkand Forward INVITE.

4

4

Identify Registrar of Called Party and Forward INVITE.5

5

Retrieve Subscriber Profile (if needed) 6

6

7

7 Apply Service Logic

Forward INVITE to Called Party8

8

SDP Negotiation / Resource Reservation Control9

9

RTP Stream

Ringing / Alerting10

10

Answer / Connect11

11

IMS call flow

RTP Stream

12

12 Session Active

Page 8: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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Packet Switched Video Telephony (PSVT)

• Example service for the MMD• Includes air interface, RAN, core network aspects,

and terminal procedures • Most procedures exist in current standards, e.g.

– X.S0011 Wireless IP Rev D– X.S0013 MMD Rev 0– A.S0011~17-C IOS– C.S0024 HRPD Rev A– C.S0001~6 CDMA2000.

Page 9: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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PSVT Components• Air Interface

– Service Options to be used for transporting SIP, Audio, Video, and RTCP traffic– Procedures for requesting appropriate air link QoS for these different traffic types

• IOS (A-interface)– Specifications for handoffs and cross paging of HRPD-1x hybrid terminals

• Packet Data Network– Identifies procedures for QoS establishment and flow treatment– Recommends header compression options– Procedures for packet data accounting

• MMD– Procedures for session setup using SIP– SIP compression and security procedures– Procedures for MMD accounting

• Following slides provide architecture and call flows.

Page 10: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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PSVT Reference Model

IPNetworks

PDSNRAN

Network A

PDSN RAN

Network B

I/S-CSCF I/S-CSCF

MSMS

MRFP(optional)

MRFC(optional)

AAA

HSS

P-CSCF

AAA

HSS

P-CSCF

AS(optional)

SIP SignalingAir Interface/IOS SignalingMedia Control for Audio/VideoPSVT /VoIP Audio Bearer PathPSVT Video Bearer PathAAA/HSS InterfacesMP Interfaces

AS(optional)

Page 11: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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PSVT Call Flow S-CSCFP-CSCFPDSNRANMS-1

8. MediaFlow

1. SIP Capability Exchange (INVITE/183)

2. Bearer Resource Establishment Completed

3. Indicate Bearer setup complete (UPDATE/200 OK)

5. Indicate MS-2 alerted (180 Ringing)

4. Called MS alerted

6. Called MS answers

7. Complete SIP session setup (200 OK/ACK)

MS-2MS-2 HN

Bearer ResourceEstablishment Completed

Page 12: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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PSVT QoS-1• Access networks (PDSN) enforce agreed QoS

for different IP flows• PDSN enforces DiffServ code points• End-to-End QoS within managed network

SIPServers

Terminal RAN PDSN PDSN RAN Terminal

RLP Links GRE Tunnel GRE Tunnel RLP Links

Audio RTP

Video RTP

Audio RTCP

Video RTCPSIP

Audio RTP

Video RTP

Audio RTCP

Video RTCPSIP

IP Network

Indicates that theencircled flows are giventhe same QoS treatment

Page 13: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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PSVT QoS-2

Air Link (RLP)

A10 connection

DSCPDSCP

A10 connection

Air Link (RLP)

SendingTerminal

ReceivingTerminalRAN PDSN PDSN RAN

DiffServNetwork

RAN maps theAir Link to the

A10 connection

PDSN polices/remarks DSCP

then forwards IPpacket

PDSN uses TFTfilter to map

packet to A10connetion

RAN maps A10to Air Link

Application QoS Negotiation (SIP/SDP)

Page 14: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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PSVT Challenges

• Low-interruption handoffs– Requires low latency inter-PDSN handoffs – HRPD does not YET support active handoffs

• Hand-down and hand-up– Variations in QoS resources or bearer support due to

sector loading or inter-technology handoffs– How to modify media streams (e.g., add/remove

video) with minimal interruption?– Updating QoS resources for MS.

Page 15: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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Transition Architecture

• Evolution to MMD in steps

• Transition architecture will support– Interworking with legacy circuit switched

networks– Handoffs from MMD services to legacy

services where possible; for example VoIP on HRPD handoff to 1x voice services.

Page 16: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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LMSD Evolution

• Legacy Mobile Station Domain (LMSD)– IS-2000 RAN, with IP-based A–interface , VoIP transport

between MSC soft-switches

• Step 1, call delivery• Step 2, handoffs and better calling features support• Ability to interwork with other network types:

– MMD/IMS– Packet Cable– DSL

• Enhancements– Faster call setup – Security for bearer.

Page 17: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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MMD Evolution• Path from circuit switched voice networks to LMSD and MMD• Transition Architecture

– Call delivery– Handoff– WLAN interworking

• Services– Conferencing– Messaging and Presence– Emergency services– Local services

• Enhancements– SIP optimization, faster session setup– Security improvements– (true?) End-to-End QoS

• Convergence and interworking with other networks, including UMTS/IMS, public Internet, Next Generation Networks.

Page 18: 1 MMD Evolution June 28, 2005. 2 Outline MMD Basics End-to-End Example –Packet Switched Video Telephony Transition to MMD Legacy MS Domain Evolution MMD

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3GPP2 MMD Roadmap

• Architecture, Security, LMSD• Stage 2• Stage 3• Access network specifications.

(note – published documents available at www.3gpp2.org)

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Architecture, Security, LMSD

• Stage 1 and Overview Documents– S.R0037-A, IP Network Architecture Model for cdma2000 Spread

Spectrum Systems– S.R0062, Presence Stage 1– X.S0027-000, Presence Overview – X.S0013-000, MMD Overview document

• Security Documents– S.R0086-A, MMD Security Framework

• Legacy Mobile Station Domain (LMSD) Documents– (IS-95/2000 circuit mode MS+RAN with VoIP core network)– S.R0092, System requirements– S.R0096 Transcoder Free Operation, Stage 1 requirements– P.S0002, LMSD - Step 1, incoming PSTN call delivery– X.S0012, MSCe-MSCe Signaling Control– X.S0018, G.711 PCM voice between MGWs.

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Stage 2

• X.S0013-002 IP Multimedia Subsystem (IMS) (based on 3GPP TS 23.228)

• X.S0013-003 IP Multimedia (IM) session handling; IM call model (based on 3GPP TS 23.218)

• X.S0013-007 Accounting  Architecture (based on TS 32.200)

• X.S0013-005 IP Multimedia (IM) Subsystem Cx Interface; Signaling flows and message contents (based on TS 29.228)

• X.S0013-010 IP Multimedia Subsystem (IMS) Sh Interface signaling flows and message contents (based on TS 29.328)

• X.S0027-001, Presence Architecture

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Stage 3

• Protocol & Procedures– X.S0013-004, IP Multimedia Call Control Protocol

based on SIP and SDP; (based on TS 24.229)– X.S0013-006, Cx Interface (HSS-CSCF) based on

the Diameter protocol; Protocol details (based on TS 29.229)

– X.S0013-008, Accounting data description (based on TS 32.225)

– X.S0013-011, Sh interface (HSS-AS) based on the Diameter protocol (based on TS 29.329.)

– X.S0017 Open Service Access (OSA); Application Programming Interface (based on TS 29.198 series)

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CDMA Access Network Documents

• Packet Data Serving Node (PDSN)– X.S0011-C, Wireless IP Network Standard (IS-835)

• CDMA2000 1x air interface– C.S0001 to C.S0006, cdma2000 Family of Standards for

Spread Spectrum Systems– C.S0047, Header compression/removal service options, allows

VoIP to be sent efficiently over the air • CDMA2000 DO air interface

– C.S0024-A (IS-856-A), Significant upgrades for supporting QoS sensitive services

– C.S0063 (TIA-1054), Enhanced Multi-flow Packet Application, eliminates overhead from PPP and octet-based HDLC-like framing. Two-route RLP facilitates seamless BSC-BSC Connected State handoff to eliminate interruption during the VoIP call.

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Current Projects

• X.P0011-D, includes MIP6 and QoS support• X.S0013 revisions, with new parts for

– Service Based Bearer Control, enables mapping/control of SDP-negotiated QoS to air interface QoS

– On-line charging– SIP optimization

• X.P0027, New parts for presence security, protocol, network presence.• X.P0028, CDMA/WLAN interworking

– Scenarios 1,2– Scenarios 3,4

• X.P0029, Conferencing• TSB-58-G, to define QoS Profiles • A-interface

– IS-878-A/IS-1878-A, QoS support on the A-interface– IS-878-B / IS-1878-B, Connected State seamless inter-BSC soft handoff and session transfer

• C.P0023-C, R-UIM cards support for MMD data• PN-0196, Lawfully Authorized Electronic Surveillance for cdma2000 VoIP• HRPD/1x interworking• End-to-end QoS • Packet Switched Video Telephony.