1. IIT Colloquium: NRC Ottawa, Canada A Vision for Evolving Local Wideband Wireless Networks Kaveh Pahlavan, Professor of Electrical and Computer Engineering and Director, CWINS/WLRL WPI, Worcester, MA http://www.cwins.wpi.edu

2. Outline Applications and the market Existing technologies and limitations Evolving standards Overview of Global activities Some research projects

3. Classification of Existing Wireless Networks Voice Driven Networks Low power, high quality, local services (PCS, wireless PBX, telepoint)-Result of success in cordless telephone industry High power, low quality, wide area (Digital Cellular) -Result of demand for higher capacity for mobile radio Data Driven Networks High speed local (Wireless LAN) - A new approach for local area networking Low speed wide area (mobile data) - Result of success in paging industry

4. Current Wireless Network Industry

5. Wireless LANs Minimum data rate: 1Mbps (IEEE 802) Designed for local indoor - less than 100m Should interoperate with wired LANs Does not need large investment on infrastructure and does not collect service charges. Transmission technology: spread spectrum, standard radio, IR Examples: Roamabout, WAVELan, Photolink, FreePort Standards: IEEE 802.11, HIPERLAN

6. History of Wireless LANs Diffused Infrared - 1979 (IBM Rueschlikon Labs - Switzerland) Spread Spectrum using SAW Devices - 1980 (HP Labs - California) Wireless modems - early 1980's (Data Radio) ISM bands for commercial spread spectrum applications - 1985 IEEE 802.11 for Wireless LAN standards - 1990 Announcement of wireless LAN products - 1990 Formation of WINForum - 1992 ETSI and HIPERLAN in Europe - 1992 Release of 2.4, 5.2 and 17.1-17.3GHz bands in EC - 1993 PCS licensed and unlicensed bands for PCS - 1993 1996:.........

7. Three Views of WWLA Existing WLAN Applications Vision for Military Applications Vision of the Service Providers

8. Service Scenarios Workplace - the main market of today, TCP/IP applications, legacy LAN backbone Home - universal access point: Internet connection, cordless telephone, flexible speakers, etc. backbone unknown (ATM preferred). Nomadic public access - backbone unknown, easier traffic policing and charging with WATM.

9. Wireless LAN Technologies

10. Wireless LAN Market 0 200 400 600 800 1000 1200 19921993199419951996 K-Unit

11. Local Wideband Wireless Activities Evolving Standard Technologies –IEEE 802.11 –RES-10 HIPERLAN –Wireless ATM Forum International Activities –In the US WINForum, U-NII –In the EC MEDIAN, WAND, SAMBA and AWACS –In Japan MMAC (High-Speed WirelessAccess and Ultra High-Speed Radio LAN)

12. Interconnection between WLAN/WATM to backbone

13. 802.11 Configurations

14. IEEE 802.11 and ISM bands Media Access Protocol (MAC) for both peer-to-peer and centralized topologies Uses 2.4 MHz ISM bands Supports DSSS (BPSK and QPSK), FHSS (GFSK), and DFIR (OOK) Data rates are 1 and 2 Mbps for DSSS and FHSS, 1Mbpsfor DFIR For DSSS the band is divided in two groups: Group I centralized at: 2412, 2442, and 2472 MHz Group II centralized at: 2427, and 2457 MHz For FHSS three patterns of 22 hops out of 79 available I MHz bands with GFSK. Minimum hop rate is 2,5 hops/second Provide interoperatability among all stations

15. IAPP (Supported byLucent, Aironet, Digital Ocean) The IAPP specification defines how access points from different vendors communicate with each other to support mobile stations roaming across cells and how they communicate across the backbone network to hand over mobile stations. The IAPP specification builds on the baseline capabilities of the IEEE 802.11 standard. The IAPP specification tackles higher-level OSI layers such as logical link control that facilitates inter-access point communications. The IAPP specification supports interoperability between products. Should be applicable to large infra-structures

16. Hiperlan ad-hoc network configuration

17. ETSI Res-10: HIPERLAN MAC for both peer-to-peer and centralized networks Uses 5.25-5.3 GHz and 17.1-17.3 GHz Uses GMSK modulation with DFE Data rates are 10-20 Mbps The maximum range is 50m Supports asynchronous data as well as isochronous voice

18. Wireless ATM Architecture [WATM Working Group Presentation]

19. Comparison of WLAN and WATM

20. Wireless ATM Activities

21. European Wideband Wireless Activities

22. Japanese Wideband Wireless Activities MMAC: Multemedia Mobile Access Communications

23. Unlicensed PCS Activity (Spectrum Etiquette) Three basic Principles: Listen before talk (or transmit) LBT Protocol Low transmitter power Restricted duration of transmissions

24. Unlicensed National Information Infrastructure Devices

25. Issues in a Mobile Network Type of roaming –Intra-Net (802.11) –Inter-Net (GPRS) –Inter-Tech (between GPRS and 802.11) Type of mobility –Continual during a move –Access at different locations Type of connection –With a unique address (mobile IP) –With any address (cash IP) Type of initiation for roaming –From the terminal –From th network

26. Evolving Roaming Related Technologies Intra-Net Roaming –LANE in WATM –802.11 –Hiperlan Inter-Tech Roaming –MASE –Artour Inter-Net Roaming –Mobile-IP

27. Layers for Implementation Physical MAC Network IP TransportationTCP Session Presentation Application 802.11, HIPERLAN,LANE ARTour Winsock MASE { Mobile IP

28. Mobile Host M M S R1R2R3R4 R20 Router Home Agent Foreign Agent Sender inform if possible LC Local cache

29. “IP in IP” Encapsulation TCP and rest of packet IP Version number, and other header fields IP Version number, and other header fields Tunnel Source IP address (home agent) CARE-OF Address (foreign agent) Original source IP address Home IP address of mobile host

30. Why Client-Server is Important Most of the current legacy applications are client- server Facilitates implementation of mobility Facilitates interoperability Facilitates scaleability Can support multiple platforms Local optimization of the server to enhance reliability and availability and results in reducing costs

31. Important Client-Server Applications Web search, FTP, Data base access, Telnet, Email

32. References K. Pahlavan, A. Zahedi, and P. Krishnamurty, “ Wideband Local Access: Wireless LAN and Wireless ATM”, invited paper, Speical Issue on WATM, IEEE Comm. Soc. Mag., Nov. 1997. K. Pahlavan and A. Levesque, Wireless Information Networks, New York: John Wiley and Sons, 1995. K. Pahlavan, A. Falsafi, G. Yang, “Transmission Techniques for Wireless LANs”, IEEE JSAC, Speical Issue on Wireless Local Communications, May 1996. K. Pahlavan and A. Levesque, “Wireless Data Communication”, Invited Paper, IEEE Proceedings, Sep. 1994. K. Pahlavan, “Wireless Intra-Office Networks”, Invited paper, ACM Trans. on Office Inf. Sys., July 1988. (also published as the opening paper in “Advances in Local and Metropolitan Area Networks”, edited by William Stalling, IEEE Press, 1994) K. Pahlavan, “Wireless Office Information Networks”, IEEE Comm. Soc. Mag, Sep. 1985. K. Pahlavan, T. H. Probert, and M. E. Chase, “Trends in Local Wireless Networks”, Invited Paper, IEEE Comm. Soc. Mag., March 1995.