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 Evolution 3GPP2 Project Roadmap.

3 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.)

4 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.

5 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.

6 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.)

7 Control Bearer Called Party Visited Network Called Party Home Network Calling Party Home Network Calling Party Visited Network UE P-CSCF HSS S-CSCF SIP Diameter UE P-CSCF AS HSS S-CSCF SIP AS SIP Diameter I-CSCF Diameter DNS Backbone Packet Network RAN Backbone Packet Network RAN Initiate SIP Invitation 1 1 Retrieve Subscriber Profile (if needed) Apply Service Logic Retrieve Address of Called Party Home Network and Forward INVITE. 4 4 Identify Registrar of Called Party and Forward INVITE. 5 5 Retrieve Subscriber Profile (if needed) Apply Service Logic Forward INVITE to Called Party 8 8 SDP Negotiation / Resource Reservation Control 9 9 RTP Stream Ringing / Alerting 10 Answer / Connect 11 IMS call flow RTP Stream 12 Session Active

8 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.

9 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.

10 PSVT Reference Model

11 PSVT Call Flow

12 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

13 PSVT QoS-2

14 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.

15 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.

16 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.

17 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.

18 3GPP2 MMD Roadmap Architecture, Security, LMSD Stage 2 Stage 3 Access network specifications. (note – published documents available at

19 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.S , Presence Overview –X.S , 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.

20 Stage 2 X.S IP Multimedia Subsystem (IMS) (based on 3GPP TS ) X.S IP Multimedia (IM) session handling; IM call model (based on 3GPP TS ) X.S Accounting Architecture (based on TS ) X.S IP Multimedia (IM) Subsystem Cx Interface; Signaling flows and message contents (based on TS ) X.S IP Multimedia Subsystem (IMS) Sh Interface signaling flows and message contents (based on TS ) X.S , Presence Architecture

21 Stage 3 Protocol & Procedures –X.S , IP Multimedia Call Control Protocol based on SIP and SDP; (based on TS ) –X.S , Cx Interface (HSS-CSCF) based on the Diameter protocol; Protocol details (based on TS ) –X.S , Accounting data description (based on TS ) –X.S , Sh interface (HSS-AS) based on the Diameter protocol (based on TS ) –X.S0017 Open Service Access (OSA); Application Programming Interface (based on TS series)

22 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.

23 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.