Convergence WLAN/CDMA Architecture. CDG Technology Forum October 7, 2005

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Priscilla Richards
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1 Convergence WLAN/CDMA Architecture CDG Technology Forum October 7, 2005

2 Outline Introduction and Network Architecture Key elements to enable WLAN/CDMA services Access control Mobility management Summary 2

3 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 3

4 Convergence Network Architecture Border Router IMS Enterprise ISP Packet Data Interworking Function (PDIF) VoIP/Data ANSI-41 Network Network Hot Spot Home Internet Public Domain Operator s Domain RAN PDSN MSC MGW PSTN 4

5 Key Architecture Elements Access Control (PDIF) Mobility Management 5

6 PDIF - 3GPP2 Specification (X.P ) PDIF: PDIF: The The Packet Packet Data Data Interworking Function Security Security gateway gateway IP IP connectivity connectivity User User authentication authentication Secure Secure tunnel tunnel management management Policy Policy Enforcement Enforcement Accounting Accounting Broker Network (0 or more) B-AAA 2 Database H-AAA 6 PDIF cdma2000 Home Network 4 optional HLR/AC HA 2 Packet Data Services 1 WLAN W-AAA 3 5 Internet MS 6

7 IPsec/MIP Tunnels S: CN D: HoA IP HoA S: HA D: TiA IP IP TIA S: PDIF D: LoA HA-MN Tunnel IP IP Wireless PHY& MAC LoA Wireless PHY& MAC IPSec Tunnel ETH IP ETH ETH ETH ETH ETH MN AP PDIF HA CN 7

8 End-to-End QoS Provisioning Enterprise QoS Provisioned DiffServ QoS Provisioned Domain PDIF VoIP/Data ANSI-41 Network Network Home ISP/MSO Internet Best Effort Hot Spot Public Domain Operator s Domain RAN PDSN MSC MGW PSTN 8

9 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 9

10 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

11 Alternative Handoff Solutions 1. Inter-MSC like handoff 2. Inter-BSC like handoff 3. Using HO number - Bridged call handoff 11

WLAN-CDMA2000 1X Handoff: Using HO Number 1X RAN MSC HLR SIP/IPVLR HO Function Mobility Server SIP MGCF MGW PSTN Internet SIP PDIF CSCF EVRC/RTP/IP Once The VoIP mobility handset CSCF MS link the

12 WLAN-CDMA2000 1X Handoff: Using HO Number 1X RAN MSC HLR SIP/IPVLR HO Function Mobility Server SIP MGCF MGW PSTN Internet SIP PDIF CSCF EVRC/RTP/IP Once The VoIP mobility handset CSCF MS link the uses is context signals released, server sends places moves the traffic is to a to the established, circuit instructs channel BYE and location CSCF mobility the message call handoff the in to server which a media begins establish the VoIP to MGW the to call a establish can 1x using gateway sending release complete. mobility signal be the set the voice to this unique context up. link VoIP strong, mobility over Bearer the side with and the context. traffic a handoff VoIP BOTH the mobility call flows connection. paths, number. to is through server. this indicated. circuit circuit the MGW (MS connection. and packet. or to FNE the PSTN. driven.) 12

13 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 13

14 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 14

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