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Dr. Mike Ritter Chief Technology Officer Wednesday, 9 May 2001 Robert J. Friday, Chief Scientist

The Architecture of Metricom’s MicroCellular Data Network™ (MCDN) and Details of its Implementation as the Second and Third Generation Ricochet™ Wide-Area Mobile Data Service. Dr. Mike Ritter Chief Technology Officer Wednesday, 9 May 2001 Robert J. Friday, Chief Scientist

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Dr. Mike Ritter Chief Technology Officer Wednesday, 9 May 2001 Robert J. Friday, Chief Scientist

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  1. The Architecture of Metricom’s MicroCellular Data Network™ (MCDN) and Details of its Implementation as the Second and Third Generation Ricochet™ Wide-Area Mobile Data Service. Dr. Mike Ritter Chief Technology Officer Wednesday, 9 May 2001 Robert J. Friday, Chief Scientist Michael Cunningham, V. P. of QA

  2. Metricom’s Technology Unique and Patented Technology MicroCellular Data Network Built from the Ground up to Support High-Speed Data In Public and Private Spectrum

  3. What is Ricochet? • Ricochet Service • Wide Area, high-speed, mobile wireless access to information (Internet, Intranet, LAN…) • Fastest wide area mobile information access solution in the market since 1995 • Next generation 128 kbps technology deployed in 13 United States markets • Ricochet Technology • MicroCellular Data Network (MCDN) • Radio Frequency (public and private spectrum) + Internet Protocol (IP) • Spread Spectrum, Frequency Hopping • Proprietary DSP, coding, and network algorithms • Packet data from inception

  4. Competing wireless service = • 9 – 14 kbps • Ricochet Wireless Service = • 128 – 200 kbps 10 x • 500 Megabytes per month • 500 kilobytes per month 1000 x MCDN’s Advantages Wireless InternetRicochet Network = Bandwidth = Capacity = Speed

  5. Key Design Advantages • Intelligent MicroCell technology • More capacity • More coverage via dense deployment • Instantaneous handoff and mobility • Built-in roaming • Scalable and robust • Packet-based (not circuit-switched) • Mesh network (not hub-and-spoke) • Self-healing, self-configuring & load-balancing • Standard IP

  6. Modem Internet and Corporate Networks Wired Access Point Network Interface Facility Ricochet System Diagram 2.3 GHz 900 MHz PoletopRadio 2.4 GHz High-speed dedicated wired connections

  7. Modem Interface to the Network • RF Physical Layer • 500 kbps QPSK on the downlink • 750 kbps 16 QAM optional - 2x performance • 200 kbps 4 FSK on the uplink • 500 kbps QPSK optional – 2x performance • Half-duplex, 1 Watt into a 0dBi ant., -100 dBm Rx. Sensitivity • Network Protocols • Transport Layer guarantees ordered delivery of packets from the gateway to the modem • Routing Layer that routes encapsulated IP packets from the gateway to the modem • Data link Layer that guarantees delivery of packets between radios

  8. MicroCell Radio Flexibility Radio Features ---------------------------- Multiple Modulations Quad 2.4 GHz Antennas 900 MHz Omni Antenna Software Radio Design Dual Band Operation Simultaneous Tx/Rx System Flexibility ----------------------- Software Downloadable Error Correction Coding Fragmentation Priority / Buffer Storage SNMP Modulation Formats ---------------------------- 2-FSK; 100 ksps; 100 kbps 4-FSK; 100 ksps; 200 kbps QPSK; 125/250 ksps; 250/500 kbps 16 QAM; 250 ksps; 1000 kbps 32 QAM; 250 ksps; 1250 kbps

  9. Wired Access Points • WAP hardware similar to cellular base station functionality at a fraction of the cost. • Typically located on towers or rooftops • One WAP supports 55-60 poletop radios • One WAP covers 11.5 sq. miles • 12 Radios installed for intial coverage • Packets routed by an enterprise-class IP switch • WAPs connect to a Network Interface Facility with high-speed dedicated WAN connections (T-1s, DS-3s)

  10. Network Interface Facility (NIF) • The NIF serves as the aggregation point for all WAP circuits • A NIF has standard IP routers and switches and MCDN gateways • The NIF provides the network connection to Channel Partners via L2TP tunnels • All NIFs co-located in WCOM or Level3 facilities

  11. Laboratory Performance

  12. MCDN vs. Other Technologies

  13. Future of MCDN Technology • 2x performance with new modems • 4G System prototypes under design • T1/E1 rates to users (>>1 Mbps) • 10x capacity • Same architecture • Replaced infrastructure • New backhaul (5.x GHz unlicensed)

  14. MCDN 3G(2X) • Software Upgrades to Poletops and WAPs • Increased Radio Link Performance and Capacity • No MicroCell Modifications • State-of-the-Art Radios Already Deployed • New Modems Based on New Chip Set • Silicon Integration • New & Improved Antennae at WAPs • Increased Capacity and Performance

  15. MCDN 4G • New Infrastructure and Modems • Additional Spectrum for Backhaul Allows an Increase in Capacity • 5.8 GHz Public Spectrum • 5.7 GHz UNII Band • New Radio Technology to Improve Speed • Wideband Radios • Increased Miniaturization and Decreased Cost • Move to DSL-like Protocols to Wireless • Continue to Improve and Extend Metricom’s MCDN Architecture

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