CDMA Systems Evolution to VoIP

Transcription

1 CDMA Systems Evolution to VoIP - Network Migration - Vocoder Technologies - Standards Support Gino Scribano, Distinguished Member of Technical Staff CDG VoIP Summit Feb 8 th, 2005 product or service names are the property of their respective owners. Motorola, Inc

2 IMS/MMD Architecture Issues CDG Questions #15, How could IMS/MMD architecture be leveraged to a competitive advantage... #18, What migration strategy would you recommend when transitioning from CS product or service names are the property of their respective owners. Motorola, Inc

3 Industry-Wide Convergence Device Convergence 1 device, accessing multiple services, via multiple access technologies Service Convergence 1 service, serving multiple devices, over multiple access technologies. Network Convergence 1 unified core, connecting multiple services to multiple devices over multiple access mechanisms GSM Core GSM Core 2G RAN CDMA Core 2G RAN CDMA Core 2G RAN Converged Core Network 3G RAN 3G RAN 3G RAN WLAN Enterprise WLAN Enterprise WLAN product or service names are the property of their respective owners. Motorola, Inc

4 Competitive Advantage through Rich & Applications The Evolution to IMS/MMD Building Rich and Applications Every Step of the Way ACCESS 1xEV-DO 1XEV-DO Rev. A Applications HIGH DATA RATE & CAPACITY IS-95 1X w/ Attachment Music Download S/W Download Live Video Broadcast Video Conference CORE IMS/MMD Foundation IMS/MMD Super Structure NON-REAL TIME Full Web Browsing Multi-Media Messaging Interactive Gaming REAL TIME Circuit switch IMS Bridge Download Ringers Transaction Based Apps SMS Location Based Voice Handsets PoC VoIP for WiFi VoIP for CDMA LOW-MED DATA & CAPACITY product or service names are the property of their respective owners. Motorola, Inc

5 Migration Phase I Today CDMA Access Networks HLR SMSC OTA etc. PSTN ANSI41/MAP/ ISUP SS7 SS7 Network 1X / HRPD-0 Softswitch MSC PDSN App. Servers Service Delivery platforms PoC Location 1X / HRPD access networks Soft switch with separate signaling and control AAA Packet Data Network HA IP IP based Data, PoC & Location services, etc. WAP enabled devices with JAVA/BREW capabilities Internet product or service names are the property of their respective owners. Motorola, Inc

6 Migration Phase II IMS/MMD Foundation - Starting in 2005 CDMA Access Networks HLR SMSC OTA etc. PSTN ANSI41/MAP/ ISUP SS7 SS7 Network Alternate Access Networks CS Domain Packet Core PDSN Softswitch MSC HSS (DS) SIP ISC App. Servers Service Delivery platforms Push-To To-X Presence WLAN Data IP IMS Internet IMS/MMD call server supports alternate access - broadband and WLAN IP backhaul and transport Incremental services via IMS Cable & DSL WiFi enabled VoIP devices product or service names are the property of their respective owners. Motorola, Inc

7 Migration Phase III - IMS Bridge - Starting in 2006 CDMA Access Networks HLR SMSC OTA etc. PSTN ANSI41/MAP/ ISUP SS7 SS7 Network App. Servers DO Rev A Softswitch MSCe SIP HSS (DS) SIP ISC BCMCS Service Delivery platforms Alternate Access Networks WLAN Voice / Data Cable & DSL Real-time MMD services - VoIP Packet Core PDSN IP IMS Internet Push-To To-X HRPD-A RAN Dual mode handsets for HRPD-A / WiFi BCMCS server IMS call server supports Cable / WLAN voice & data WiFi VoIP - IMS bridges PS and CS domains product or service names are the property of their respective owners. Motorola, Inc

8 Migration Phase IV IMS/MMD Super Structure - Starting in 2007 CDMA Access Networks HLR SMSC OTA etc. Alternate Access Networks Packet Core (PDSN/ GGSN) Softswitch MSCe SIP ANSI41/MAP/ ISUP SS7 HSS (DS) PSTN SIP ISC App. Servers VoIP for HRPD-A Push-To To-X BCMCS Service Delivery Platforms IP IMS Wideband audio and narrowband telephony WLAN Voice / Data Cable & DSL Internet Seamless mobility for VoIP enabled devices Converged IP core network Cost effective platform solution that permits full assets reuse as technologies evolve product or service names are the property of their respective owners. Motorola, Inc

9 VoIP Vocoder Issues CDG Questions #4, Can VoIP match Voice quality and Performance of a Circuit Switched Network... #5, What impact will VoIP have on CDMA capacity for mixed voice and data traffic... #6, What are the tradeoffs between system capacity, voice quality, QoS and other parameters... product or service names are the property of their respective owners. Motorola, Inc

10 Voice Bearer Path Reference Circuit Switched VoIP via IMS/MMD MSC M-L PSTN M-M Tandem M-M Bypass MSC M-L VoIP Circuit Access GW AN/ PSTN Media GW M-M Tandem VoIP GW M-M Access Bypass GW Internet M-L VoIP End-to-End AN/ product or service names are the property of their respective owners. Motorola, Inc

11 Voice Quality by Call Type Call Type (Bearer Path) Circuit M-L, M-M Tandem (DCH air, PCM network) Circuit M-M Vocoder Bypass (DCH air, Circuit data network) VoIP M-L, M-M Tandem (SCH air, PCM network) VoIP E2E, M-M Vocoder Bypass (SCH air, IP network) Narrowband Vocoder (Eg, EVRC) Good (Baseline) Better (NB; tandem free) Good (= baseline if QoS) Better (NB; tandem free) Wideband Vocoder (Eg, VMR-WB) Good+ (NB; + if RS2) Best (WB; tandem free) Good+ (NB; + if RS2) Best (WB; tandem free) product or service names are the property of their respective owners. Motorola, Inc

12 Voice Performance by Call Type Call Type (Bearer Path) Delay Jitter Frame Loss Circuit M-L, M-M Tandem (DCH air, PCM network) Best Good Best Best Good Circuit M-M Vocoder Bypass (DCH air, Circuit data network) Better (tandem free) Best Good (2 RF links) VoIP M-L, M-M Tandem (SCH air, PCM network) Better Good Better Better Good VoIP E2E, M-M Vocoder Bypass (SCH air, IP network) Better (tandem free) Good Good Good: 250 ms end-to-end delay, 20ms jitter, 2% end-to-end frame loss Best: 150ms end-to-end delay, 0.5ms jitter, 1% end-to-end frame loss product or service names are the property of their respective owners. Motorola, Inc

13 Vocoder Negotiation in IMS/MMD The Session Initiation Protocol (SIP) and Session Description Protocol (SDP) enable end-to-end, prioritized, media (eg, vocoder) type negotiation. MGCF Alice Bob PSTN CSCF INVITE [media= EVRC, 13K] Access GW AN/ Access GW AN/ ACK Response OK [media= EVRC] EVRC Alice Bob Vocoder type and Transcoding location are dependent on terminal device capabilities and intermediate Gateway capabilities product or service names are the property of their respective owners. Motorola, Inc

14 VoIP Vocoder Summary VoIP can offer same voice quality as circuit for M-L and M-M tandem call types VoIP can offer higher voice quality for M-M and end-to-end M-L IP Effectively supports vocoder bypass & negotiation Enables higher quality wideband vocoders VoIP can approach typical circuit switched voice performance Requires effective QoS Requires well-engineered transport networks SIP /SDP protocols enable scalable vocoder negotiation & technology insertion IMS/MMD architecture enables centralized and distributed transcoder locations product or service names are the property of their respective owners. Motorola, Inc

15 VoIP Standards Issues CDG Questions #3, Do current standards fully support Network VoIP implementation #10, Can VoIP provide seamless handoff mobility management product or service names are the property of their respective owners. Motorola, Inc

16 3GPP2 VoIP Standards Gaps VOIP Standards in Progress Multiple packet connections in HRPD Required to support simultaneous VoIP and data sessions TIA-2000-C (Multiple service instances) and C.S0063 (Multi-Flow Packet Application) complete TIA-835-D (QoS), HRPD-IOS-A (Multi-Flow Packet Application), IOS v5.1 (QoS), TIA-856-A Addendum (minor enhancements) in progress Intra-technology HRPD Active Hard Handoff Support Required to prevent VoIP service interruption during handoff HRPD IOS Rev A or Rev A Addendum in progress Fast Handoff support (TBD) product or service names are the property of their respective owners. Motorola, Inc

17 3GPP2 VoIP Standards Gaps - 2 VOIP Standards Gaps Not Yet Targeted for a Release Inter-technology Handoff between HRPD and 1X Required for VoIP-to-VoIP and 1X Circuit-to-VoIP handoff triggered by coverage boundaries Enhancements to TIA-873 (MMD), TIA-2000, TIA-856, HRPD IOS, and TIA-835 are needed Inter-technology Redirection between HRPD and 1X Required for VoIP-to-VoIP and 1X Circuit-to-VoIP handoff triggered by network events and preferences Examples: overload control, preferred network available, etc. Enhancements to TIA-873 (MMD), TIA-2000, TIA-856, HRPD IOS, and TIA-835 are needed product or service names are the property of their respective owners. Motorola, Inc

18 3GPP2 VoIP Standards Conclusion Recommend 3GPP2 prioritize work to close standards gaps Motorola, Sprint and US Cellular jointly introduced a work item (3GPP2-0094) to support these features Specifications in progress complete in 05 Specifications involving call terminations, originations and intratechnology active handoffs is possible in 05 Inter-technology active handoff work is possible in 06 product or service names are the property of their respective owners. Motorola, Inc

19 Backup Material product or service names are the property of their respective owners. Motorola, Inc

20 Acronyms & Definitions CSCF DCH MGCF M-L M-M Tandem M-M Vocoder Bypass Narrowband (NB) SCH VoIP End-to-End Wideband (WB) Call Session Control Function Dedicated Channel Eg, 1X Fundamental Channel Media Gateway Control Function Mobile to Land call Mobile to Mobile call involving more than one vocoder stage in the bearer path Mobile to Mobile call involving one vocoder stage in the bearer path Audio signal bandwidth Hz; requires 8 KHz PCM sampling Shared Channel Eg, HRPD Traffic Channel M-L or M-M call supporting RTP/IP bearer between terminal devices Audio signal bandwidth Hz; requires 16 KHz PCM sampling product or service names are the property of their respective owners. Motorola, Inc

21 Wideband Vocoder Overview Higher fidelity than Narrowband (eg, EVRC) vocoders Wideband audio bandwidth Hz (16 KHz sampling) Narrowband audio bandwidth Hz (8 KHz sampling) Wideband Narrowband Interworking Enables circuit switched M-L and M-M Tandem calls with wideband service option assigned to mobiles Current technology requires Rate Set 2 (14.4 kbps) radio channel for highest voice quality Rate Set 2 enables higher average data rate (ADR) Higher ADR enables better recovery in frame error/loss conditions Vocoder technology improvements enable Rate Set 1 (9.6 kbps) to be used with very good voice quality Rate Set 1 quality is expected to be near Rate Set 2 quality in low frame error/loss conditions product or service names are the property of their respective owners. Motorola, Inc

22 Voice Performance Factors Overview Delay factors Number of Vocoder stages in path Dedicated circuit vs. shared packet links Jitter factors Dedicated circuit vs. shared packet links Number of shared packet links in path Frame Loss factors Number of air interface links in path Dedicated circuit vs. shared packet links product or service names are the property of their respective owners. Motorola, Inc