MMD Evolution June 28, 2005
Outline • MMD Basics • End-to-End Example • Packet Switched Video Telephony • Legacy MS Domain Evolution • Transition to MMD • MMD Evolution • 3GPP2 Project Roadmap
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.)
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.
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 • Also defines interworking with circuit switched networks via Media Gateways.
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 must be addressed • (VoIP surveillance, tax structure for internet services, E911 and position location, etc.)
1 Initiate SIP Invitation 6 Retrieve Subscriber Profile (if needed) 2 Retrieve Subscriber Profile (if needed) 7 Apply Service Logic 3 Apply Service Logic 8 Forward INVITE to CLD Party 4 Retrieve Address of CLD Party Home Network and Forward INVITE. 9 SDP Negotiation / Resource Reservation Control 10 Ringing / Alerting Control 5 Identify Registrar of CLD Party and Forward INVITE. 11 Answer / Connect Bearer 12 Session Active Calling Party Home Network Called Party Home Network HSS DNS HSS AS 2 Diameter 6 Diameter Diameter 4 AS 5 3 7 S-CSCF I-CSCF S-CSCF SIP SIP UE UE 8 SIP SIP Calling Party Visited Network Called Party Visited Network P-CSCF P-CSCF RAN RAN 11 10 Backbone Packet Network Backbone Packet Network 1 9 12 RTP Stream RTP Stream Basic call flow
Packet Switched Video Telephony (PSVT) • An 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.S00xxxxxxxxxxxx IOS • C.S0024 HRPD Rev A • C.S0001 - C.S0006
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.
PSVT QoS-1 • Access networks enforce agreed QoS for different IP flows
PSVT QoS-2 • PDSN enforces DiffServ code points • End-to-End QoS possible within managed network • (REDRAW figure)
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.
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 feature support. • Ability to interwork with other network types: • MMD/IMS • Packet Cable • DSL • Enhancements • Faster call setup • Security for bearer.
Transition Architecture • Evolution to MMD will occur in steps • Transition architecture will support • Interworking with legacy circuit switched networks • Handoffs from MMD services to legacy services where possible.
MMD Evolution • Define the path from circuit switched voice networks to LMSD and MMD • Transition Architecture • Call delivery • Handoff • WLAN….. • Services • Conferencing • Messaging and Presence • Emergency services • Local services. • Enhancements • Faster session setup • Security.
Future Development • True End-to-End QoS • Full interworking with other networks, including UMTS, public internet, Next Generation Network
3GPP2 MMD Roadmap • Architecture, Security, LMSD • Stage 2 • Stage 3 • Access network specifications. (note – published documents available at www.3gpp2.org)
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.
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
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)
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.
Current Projects • X.P0011-D, includes MIP6 and QoS support • X.P00xx, End-to-end QoS • X.S0013 revision • Includes new part for Service Based Bearer Control, X.P0013-012, enables mapping/control of SDP-negotiated QoS to air interface QoS. • 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 • Packet Switched Video Telephony.