1. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 1 Integration of WLAN and Wide Area Mobile Networks Author: Jamshid Khun-Jush Ericsson Research - Corporate Unit, Germany jamshid.khun-jush@eed.ericsson.se

2. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 2 Wireless Data Solutions WLAN Usage Scenarios Why WLAN - GPRS/3G Interworking Interworking Level/Architecture Options –Basics –Pros & Cons Interworking Service Aspects and Security Challenges Standardization Content

3. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 3 Complementary Wireless “Data” Solutions Mbps 1101000,1 Mobility WLAN User Bitrates 3 rd Generation cellular Bluetooth Wide Area Mobile Network (WAMN) Wireless Personal Area Network (WPAN) Wireless Local Area Network (WLAN) 2 nd Generation Cellular 11b H2 / 11a / HiSWAN

4. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 4 SGSNGGSN IWU Enterprise Wireless ISP Home/SOHO Mobile Operator Ethernet Internet WLAN Usage Scenarios WLAN WAMN AP - AP Mobility (link level)

5. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 5 Why WLAN – GPRS/3G interworking? Requirements: –needs for “global” roaming and mobility –needs for high capacity - especially at hot spots Market: –Users of PC-type terminals as a part of the 3G operator subscriber base –3G packet service expansion with small investment costs –New services and applications –Increased overall customer value  Increased revenue stream

6. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 6 Why Standardized Integration? More flexible and wider deployment Larger market for WLAN Exploiting world wide roaming infrastructure More advanced interworking solutions Support for cellular services on the WLAN segment Platform for new service concepts

7. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 7 How a Single Global Interworking Standard? WLAN – a family of technologies –Interesting in an interworking perspective IEEE 802.11 MMAC HiSWANa HiperLAN2 Challenge –A multiparty standardization issue Remedy –Collaboration on standard harmonization HiperLAN2- 3G Interworking spec. & HiSWANa network spec. –3GPP feasibility study on a generic solution Generic solution – needs wider collaboration –HiperLAN2 – 3GPP has initiated a dialogue –ETSI BRAN is in a position to play an important role Number of collaboration points with all parties in discussion

8. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 8 Interworking Level/Architecture Two basic approaches: –tight interworking (Iu-based) –loose interworking (IP-based) Results in different characteristics and time lines, different pros & cons Both alternatives may lead to full support of all requirements in a long term

9. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 9 Tight Interworking: Basic Architecture SGSN: Serving GPRS Support Node GGSN: Gateway GSN AAA: Authentication, Authorisation and Accounting 3GPP based Core Network IWU WRAN UTRAN SGSN HLR AuC HSS Gr GGSN/FA Signalling ISP / Corporate/ Service Network Gi Gn AP RNC AP Node B Signalling and User data HA AAA L2/L3 Switch BS GERAN BSC BS Node B Iu/Gb Iu Roaming partner Iuhl2 HSS

10. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 10 Tight Interworking: Features and Elements IWURNCIWU GGSN SGSN AP IuIuhl2 Iurhl2/utrIurhl2 IubIubhl2 UuUuhl2 Node B Node B Dual mode Mobile Iubhl2 interface for WRAN connection to the 3G core Network –Iuhl2 very similar to Iu –Iubhl2 and Uuhl2 are WLAN specific –Iurhl2 can be WLAN specific Reuse of 3G mechanisms for mobility, QoS and security WLAN-3G interworking unit (IWU) needed

11. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 11 Loose Interworking: Basic Architecture 3GPP based Core Network WSN/FA WRAN UTRAN SGSN HLR AuC AAA HSS Gr (Diameter)Wx GGSN/FA Signalling ISP / Corporate/ Service Network Gi IP Gn AP RNC AP BS Node B Signalling and User data HAAAA L2/L3 Switch GERAN BSC BS Node B Iu/Gb Iu AAA Roaming partner

12. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 12 Loose Interworking: Features and Elements AP The rest of WLAN network Router w/ foreign agent MT with (U)SIM Gr AAAL GGSN w/ foreign agent SGSN RNC Node B IP network HLR AAAH HSS Wx “The rest of WLAN network” IP router w/ foreign agent Wx is the interface between the WLAN Interworking architecture and 3G 3G integration by IETF protocols, e.g. Authentication by AAA protocols. –Home AAA server (AAAH) is a part of the HSS –Local AAA server (AAAL) is part of the WLAN interworking architecture. Different user identities linked by HSS –unified treatment of a user wrt billing, service network functionality etc.

13. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 13 Tight Interworking: Pros & Cons Pros Fully integrated mobility management –high performance handover! Full service & thus QoS mapping possible Prospects for future development No need for additional AAA functionality Cons Will lead to a significant standardization effort! May take some time to be deployed

14. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 14 Loose Interworking: Pros & Cons Pros Adapts well to IP protocol architecture Requires small standardization efforts in the short term Cost for deployment and maintenance Fast time to market Reduced business risk Cons Unclear service & QoS mapping Handover performance MAY BE unsatisfactory Recommendation  Go for Loose Interworking

15. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 15 Service Aspects in an Interworking Context Numerous additional service concepts –A singular point of contact for the wireless user (administrational service gain) –Easier and more efficient corporate access –3G services over WLAN access network e.g. IP Multimedia Subsystem (IMS) Location Based Services (LBS ) WLAN –A Pure data network Limitation of service offering? Fundamental for the realization of a solution within a reasonable time –Voice service Considered unimportant from the WLAN Side

16. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 16 Interworking Scenario Voice service is a part of the interworking concept served by the public cellular access WLAN Services H2/11a/HiSWANa 3G Services (IMS.LBS..) Voice CS-services 3G WLAN Services 3G Services (IMS.LBS..) Voice CS-services 3G H2/11a/HiSWANa A micro cellular network under a 3G umbrella cell

17. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 17 Security - Challenges Security must be preserved within the WLAN domain as it is in the 3G network –Both for User and for Network An obvious challenge for WLAN community – Level of protection differs in all WLAN systems Integrity Confidentiality Denial of service … Solutions for obtaining a secure authentication in an interworking scenario  Robert`s presentation

18. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 18 Standardization BRAN finalized and published H2-3G Interworking requirements document Collaboration between BRAN and 3GPP underway 3GPP started a feasibility study on WLAN-UMTS interworking –Objective: a generic solution for all WLAN standards –Required: a wide collaboration amongst WLAN standards bodies BRAN and Japanese MMAC collaboration started BRAN seeks collaboration with IEEE802.11 on this issue

19. doc.:IEEE 802.11 02/106 Submission Jamshid Khun-Jush, Ericsson January, 2002 Slide 19