1 OFDM For Next Generation Mobile Wireless Internet Rajiv Laroia CTO, Flarion Technologies.

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OFDM For Next GenerationOFDM For Next GenerationMobile Wireless InternetMobile Wireless Internet

Rajiv LaroiaCTO, Flarion Technologies

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What is Mobile Wireless Internet?

Anywhere anytime Internet connectivity (WAN)Typically over licensed spectrum

• Seamless extension of the Internet: end-to-end IP• Support for voice and broadband data• Provide QoS (Quality of Service)• Affordable to end users

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Is OFDM Technology the Answer?

United States --- CDMA 2000

Europe --- GPRS (TDMA) / UMTS (W-CDMA)• Circuit switched approach, complex network• Not seamless, Internet protocols don’t work• Circuit voice, packet data• No interactive data support, no QoS support• Expensive to end users

Is 2.5/3G the Answer?

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OFDM Based Wireless TechnologyThe Right Answer

Flarion Technologies has developed flash-OFDM™, a new packet data air-interface technology for mobile wireless Internet.

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Public Internet

Operator’s IP Network

User Terminals

Base Stations

flash-OFDMNetwork Architecture

Gateway

Cellular Air Interface

PSTN Gateway

End-to-End IP

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flash-OFDM Air-Interface Advantage

• Circuit switched systems– Create pipes (physical layer)

• Packet data systems – Create fat pipe (physical layer)– Share pipe efficiently

between users (MAC layer)

– Create reliable links for data (link layer)

– Send packet data over links (higher layers)

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To

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symsymTT1/T1/TTimeTime

Fast Hopped - Spread Spectrum

flash-OFDM Physical Layer Advantage

• Downlink & Uplink based on OFDM– Orthogonal --- TDMA benefits– Spread Spectrum --- CDMA benefits

Fat PipeFat Pipe

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symsymTT1/T1/TTimeTime

flash-OFDM MAC/Link Layer Advantage

• OFDM granular resource partition – No overhead control messaging

– Data as frames

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Data Frame

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• Fast retransmission over airlink– Few millisecond retransmission loop time– Supports interactive applications

• Uplink transmission requests – No contention based access– Uplink/downlink data frames

scheduled

flash-OFDM MAC/Link Layer Advantage

Interactive DataInteractive Data

QoSQoS

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flash-OFDM Higher Layer Advantage

• Reliable link– Far fewer end-to-end retransmissions

• Low delay– Efficient transport layer (TCP/IP)– Higher burst rates meaningful– Interactive applications supported (VoIP)

• Mobile IP for hand-off – True make-before-break

with no soft-handoff– IP to the RadioRouter™ – Reliable seamless handoffs

Better Better User ExperienceUser Experience

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flash-OFDM System Advantages

• Transmit antenna and multi-user diversity• Autonomous RadioRouters™

– No common timing reference (no GPS)– No need for frequency or code planning– No knowledge of neighboring RadioRouters™

• Scalable, flexible architecture• Lower cost:

– System planning– System deployment– Maintenance

Highest bits/Hz/$

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Make The Internet MoveMake The Internet Move