Interworking Architecture for WLANs, WMANs and 3G Cellular Networks November 2004 Interworking Architecture for WLANs, WMANs and 3G Cellular Networks Young M. Woo, Kookmin University, Korea Young J. Lee, Kookmin University, Korea Yeong M. Jang, Kookmin University, Korea Ki J. Lee, DACOM, Korea Brian Lee, DACOM, Korea Dong C. Lee, DACOM, Korea E-mail: yjang@kookmin.ac.kr Kookmin Univerisity & DACOM, Korea

Contents Background Interworking Architecture November 2004 Contents Background Interworking Architecture Vertical Handover Procedure Technical Requirements Summary Kookmin Univerisity & DACOM, Korea

Background WLAN 802.11b: 11Mbps , 802.11a/g: 54Mbps Hotspot area November 2004 Background WLAN 802.11b: 11Mbps , 802.11a/g: 54Mbps Hotspot area Much higher data rates compared with 3G cellular, but can only cover users with low mobility in smaller areas WMAN In Korea, WiBro service is expected to be commercialized in 2006 Broadband wireless internet service and move anywhere with seamless wireless internet connection 3G Cellular Network Limited peak rates that range from 64kbps to nearly 2.4Mbps as a maximum Wide area coverage Always on, ubiquitous connectivity with relatively low data rates to users with relatively high mobility Kookmin Univerisity & DACOM, Korea

Background (Cont.) Characteristics Characteristics WLAN (802.11a/b/g) November 2004 Background (Cont.) Characteristics Characteristics WLAN (802.11a/b/g) WMAN (802.16/e) 3G Cellular Network (1X EV-DO) Data Rate ~54Mbps 24Mbps/6Mbps 2.4Mbps/ 153.6Kbps Range 50~100m Several km Several tens km Mobility Below 30~40km/h About 60 km/h Over several tens km/h Kookmin Univerisity & DACOM, Korea

November 2004 Background (Cont.) Interworking for 3G cellular networks, WMAN, and WLAN Ubiquitous service Triple mode terminal Suitable interworking models CDMA-WLAN WLAN-WMAN WMAN-CDMA Kookmin Univerisity & DACOM, Korea

Background (Cont.) Loose Coupling No change in infrastructure November 2004 Background (Cont.) Loose Coupling No change in infrastructure L3 handover Use Mobile IP Easy implementation Tight Coupling Low latency handover Seamless service L2 handover Exchange equipment Heavy traffic Kookmin Univerisity & DACOM, Korea

Interworking Architecture November 2004 Interworking Architecture Phase 1 Loose coupling interworking Roaming agreement AAA : Authentication Authorization and Accounting HA : Home Agent FA : Foreign Agent PDSN : Packet Data Serving Node MSC : Mobile Switching Center BSC : Base Station Controller BTS : Base Transceiver System PSTN : Public Switched Telephone Network PAR : Packet Access Router APM : Access Point Manager Kookmin Univerisity & DACOM, Korea

Interworking Architecture (Cont.) November 2004 Interworking Architecture (Cont.) Phase 2 Loose coupling + Tight coupling Kookmin Univerisity & DACOM, Korea

Interworking Architecture (Cont.) November 2004 Interworking Architecture (Cont.) WMAN-CDMA Networks Loose coupling Voice oriented (CDMA networks) and data oriented (WMAN) Data transmission during movement (about 60km/h) in the large coverage. No need to modify CDMA infrastructure existed widely Kookmin Univerisity & DACOM, Korea

Interworking Architecture (Cont.) November 2004 Interworking Architecture (Cont.) CDMA Network-WLAN Loose coupling Voice oriented (CDMA) and data oriented (WMAN) High data transmission rate in the dense area No need to modify CDMA infrastructure existed widely Kookmin Univerisity & DACOM, Korea

Interworking Architecture (Cont.) November 2004 Interworking Architecture (Cont.) WLAN-WMAN Tight coupling Data oriented (WMAN, WLAN) Seamless data transmission as a low latency handover Efficient than loose coupling Kookmin Univerisity & DACOM, Korea

Vertical Handoff Procedure November 2004 Vertical Handoff Procedure 3G CDMA Networks-WMAN Call Flow for Phase 2 (CDMA → WMAN) R-P(RAN-PDSN interface) Kookmin Univerisity & DACOM, Korea

Vertical Handoff Procedure (Cont.) November 2004 Vertical Handoff Procedure (Cont.) 3G CDMA Networks-WLAN Call Flow for Phase 2 (CDMA → WLAN) Kookmin Univerisity & DACOM, Korea

Vertical Handoff Procedure (Cont.) November 2004 Vertical Handoff Procedure (Cont.) WMAN-WLAN Call Flow for Phase 2 (WMAN → WLAN) Kookmin Univerisity & DACOM, Korea

Technical Requirements November 2004 Technical Requirements Loose Interworking Architecture Seamless handoff algorithm Handoff decision algorithm Layer 2.5 functionality Tight Interworking Architecture Load balancing in the core network (e.g., CAC) Exchange equipment Kookmin Univerisity & DACOM, Korea

Summary Interworking for 3G CDMA Network, WMAN, and WLAN November 2004 Summary Interworking for 3G CDMA Network, WMAN, and WLAN Triple mode terminal Combined loose coupling and tight coupling architecture Seamless handoff algorithm Load balancing algorithm Kookmin Univerisity & DACOM, Korea