Convergence WLAN/CDMA Architecture CDG Technology Forum October 7, 2005 Outline • Introduction and Network Architecture • Key elements to enable WLAN/CDMA services – Access control – Mobility management • Summary 10/5/2005 2 Value of WLAN Access • Enhanced in-building coverage – Improved voice quality – Improved packet data user access bandwidth • Traffic offload from cellular to local wireless network • Wireline/wireless service integration • Global roaming via WLAN access 10/5/2005 3 Convergence Network Architecture IMS Border Router VoIP/DataANSI-41 Enterprise Network Packet Data Network Interworking Function (PDIF) ISP MGW Hot Spot PDSN Internet RAN MSC PSTN Home Public Domain Operator’s Domain 10/5/2005 4 Key Architecture Elements • Access Control (PDIF) • Mobility Management 10/5/2005 5 PDIF - 3GPP2 Specification (X.P0028-200) Broker Network cdma2000 •• PDIF:PDIF: The The Packet Packet Data Data (0 or more) Home Network InterworkingInterworking Function Function Database •• SecuritySecurity gateway gateway 2 • IP connectivity B-AAA H-AAA 4 • IP connectivity optional HLR/AC •• UserUser authentication authentication 6 9 •• SecureSecure tunnel tunnel management management PDIF 8 •• PolicyPolicy Enforcement Enforcement HA •• AccountingAccounting 7 2 Packet Data Services 5 1 W-AAA WLAN 3 Internet MS 10/5/2005 6 IPsec/MIP Tunnels S: CN D: HoA HoA IP S: HA IP D: TiA TIA HA-MN IP S: PDIF Tunnel IP D: LoA LoA IPSec IP Tunnel IP ETH ETH ETH ETH Wireless Wireless PHY& PHY& ETH ETH MAC MAC MN AP PDIF HA CN 10/5/2005 7 End-to-End QoS Provisioning QoS Provisioned Domain QoS Provisioned PDIF VoIP/DataANSI-41 Enterprise DiffServ NetworkNetwork ISP/MSO MGW PDSN Home Internet Best Effort RAN MSC PSTN Hot Spot Public Domain Operator’s Domain 10/5/2005 8 Mobility Management • Mobility in WLAN – Movement crossing IP subnets • Mobility Between WLAN/CDMA – Movement between Wireless LAN and wide area CDMA – WLAN VoIP to CDMA2000 1xEV-DO VoIP hand off : Fast Mobile IP handoff – WLAN VoIP to CDMA2000 1X handoff 10/5/2005 9 Requirements for Voice Call Handoffs • Strive for seamless handoff without service interruption – At a minimum, no call drops – Ideally, interruption under 100 ms • Permit no changes to the existing CDMA2000 1X infrastructure • Support single-number call delivery to handset via CDMA & WLAN • Off-load voice traffic from CDMA2000 1X circuit network to VoIP packet network 10/5/2005 10 Alternative Handoff Solutions 1. Inter-MSC like handoff 2. Inter-BSC like handoff 3. Using HO number - Bridged call handoff 10/5/2005 11 WLAN-CDMA2000 1X Handoff: Using HO Number 1X RAN MSC HLR SIP PSTN SIP/IPVLR Mobility MGCF MGW HO Function Server SIP CSCF TheOnceVoIP mobilityhandsetCSCFMS linkthe uses iscontext signalsreleased, serversendsplacessignalsmoves the trafficis to a ato to theestablished,acircuitinstructschannelBYEand location CSCFmobilitythe message call handoff andthe intoto server which amediabeginsestablishthe VoIPto is MGW theto call aestablishcan1xusinggatewaysendingreleasecomplete. mobility signal be the set the voice tois thisuniquecontext up. linkVoIPstrong, mobility over Bearerthe side with and thecontext.trafficahandoffVoIPBOTHof handoffthe mobility callflows connection.paths, number. tois throughserver.thisindicated. circuit circuit the Internet PDIF MGW(MSconnection.and packet.or to FNE the PSTN.driven.) EVRC/RTP/IP 10/5/2005 12 Handoff Using HO Number • Performance similar to a call transfer – Minimum service interruption • Requires no changes to the CDMA2000 1X infrastructure. • VoIP calls do not use any CDMA2000 1X MSC resources 10/5/2005 13 Summary • We have discussed the key architecture elements to enable WLAN/CDMA services: – PDIF – Access Control – Mobility management • WLAN to CDMA2000 1X handoff is an important element to enable the WLAN/CDMA services for the near term – Longer-term focus should be on solutions for seamless WLAN VoIP to CDMA2000 1xEV-DO VoIP handoff. – Bridged call solution provides sufficient simplicity and performance 10/5/2005 14.