ContentWired Universal Serial Bus (USB)Overview of Wireless USB
(wUSB)History/VisionFeaturesHow wUSB
WorksDesignSecurityIssues/LimitationsCurrent
ImplementationsFuture/Conclusion
Wired USBOverviewPlug/Play standard for peripheral
devicesStandardized by the USB Implementers ForumTechnical
DetailsHost/Slave ConnectionPC (host) manages all transfers;
peripherals (slave) just respondsSupports 127 slaves per
hostPhysical ConnectionFour wire connectionTwo wires for power (+5
and GND)Two wires (twisted pair) for synchronous serial
dataComputer supplies power (up to 500 mA)
Wired USBTechnical Details Data RatesLow Speed: 1.5 Mbps
(Keyboards, mice, etc.)Full Speed: 12 Mbps (USB1.1 max
speed)Hi-Speed: 480 Mbps (USB2.0 max speed)
Reasons For Wireless USBWired IssuesWires are
restrictiveMultiple wires can be a hassleWires slower than wireless
solutionsCurrent wireless solutions inadequateBluetoothBandwidth of
3 Mbps not enough for higher demand applications (Video, HDTV,
Monitor)WiFiExpensiveToo much power usage for mobile devices
Data Rate Comparisons
Wireless USB OverviewOverviewHas evolved as companies figured
out standardsBased on Ultra-Wideband (UWB) RF technologyUWB is a
technology for transmitting data over a large bandwidth (>500
MHz)History of Ultra-Wideband (UWB)Late 1800s: Started with Spark
Gap radio for transmitting Morse Code1924: Spark Gap forbidden due
to disruptive nature to narrowband carrier radios1960s 1999s:
Better test equipment promoted research of UWB for radar and
communications
Wireless USB OverviewGoals of Intel OFDM-UWB Wireless USB
StandardWireless version of USB; same features, speedsInteroperable
across three major platformsConsumer Electronic devices (digital
video/audio)Mobile devices (cellular phones, PDA)Personal Computing
(laptop, PC, printer, peripherals)High bandwidth to support
demanding data transfer (High Definition, Monitors)Mobile
friendlyLow power usageInexpensive costsSmall physical
implementationHigh level of securityNext gen Wireless Personal Area
Network (WPAN)
Wireless USB Vision
Wireless USB Vision
Wireless USB Physical DesignFeatures of UWBSpeed/RangeScaleable
speeds up over 1 GbpsCurrently 480 Mbps at 3 m; 110 Mbps at 10
mFrequency: 3.1 GHz to 10.6 GHzDivided into 14 bands; 5 groupsEach
band is 528 MHz wideOFDM symbols are interleaved across all
bandsProvides protection against multi-path / interference
Wireless USB Security DesignAssociation (cont.)Wired
VerificationCable is attached between devicesExchanges a unique
384-bit identifier known as the connection contextNumeric
AssociationDevices associate wirelesslyUser must enter a hex code
manually
Wireless USB ImplementationsBelkin Cable Free HubReleased Dec,
2006Dongle attaches to PCRetail price of $199.00Speeds up to 480
Mbps
Wireless USB ImplementationsSeagate Wireless USB Hard
DriveComing soon2.5 inches wideSpeeds up to 480 Mbps
