29-12-2010, 03:11 PM
BY:SARVESH KUMAR
[attachment=7745]Wireless USB Overview
Goals of Intel OFDM-UWB WUSB Standard
Wireless version of USB with same features, speeds
Implementable across three major platforms
Consumer Electronic devices (e.g.,digital video / audio)
Mobile devices (e.g. cellular phones, PDA)
Personal Computing (e.g., laptop, PC, printer, peripherals)
High bandwidth to support demanding data transfer (e.g., High Definition Monitors)
Mobile friendly
Low power consumption
Reduced cost of implementation
Small physical size
High level of security
Used IN Next generation Wireless Personal Area Network (WPAN)
Data Rate Requirements
Wireless USB Vision
Can connect a PC/
laptop to as many as 127 peripheral devices simultaneously.
Like monitor, keyboard , printer, camera, sounding devices, modem, flash card reader ,projector requiring no wired physical connection etc.
Wireless USB Design
Features of UWB
Speed/Range
Scalable speeds up over 1 Gbps
Currently 480 Mbps at 10 m; 110 Mbps at 20 m distance
Frequency range: 3.1 GHz to 10.6 GHz
Divided into 14 bands and 5 groups
Each band is 528 MHz wide
OFDM symbols are interleaved across all bands
Provides protection against multi-path / interference
Wireless USB Physical Design
Frequency: 3.1 GHz to 10.6 GHz (cont.)
Band Groups 1 & 2 used for Longer range applications
Bands Groups 3 & 4 used for shorter range applications
Bands can be turned off to accommodate for conflicts or for regulations
Wireless USB Design
Power
Power consumption is limited due to usage of wide spectrum .
C = B.W.IN(1+S/N)
Low power for mobile devices and minimum interference allows
Max output to -41.3 dBm/MHz.
Security Design
Overview
Strongly stressed in WUSB specification and outlined in its own requirements document.
More we go in air more are the chances of being Accessed by other devices or unauthorized users.
Two major components of security check are : Association and Encryption
Association
Device must first associate with the host in a one-time event.
Accomplished via wired verification or numeric association.
Security Design
Wired Verification
Cable is attached between devices
Exchanges a unique 384-bit identifier known as the “connection key”
Numeric Association
Devices associate wirelessly
User must enter a hex code manually
WIRELESS DEVICE INTERCONNECT
Security Design
Encryption
Data encrypted with the AES 128 algorithm
During each session devices derive a session key based on “connection key”
Wireless data is encrypted using session key
Does not encrypt PHY and MAC headers
Connection Design
Host/Slave Connection
Similar to wired USB
minimum interference
Power Management
Sleep/Listen/Wake is used
Transmitter / Reciever power management
Wireless USB Issues/Problems
Product Comparison
Freescale uses wireless USB dongle separately in addition to host pc/laptop
USB implementation forum uses integrated wireless USB ‘Hub and Spoke’ model
Wireless USB Implementations
Belkin Cable Free Hub
Released Dec, 2006
Dongle attaches to PC/laptop
Retail price of $199.00
Speeds up to 480 Mbps
Wireless USB Implementations
GeFen HMDI Extender
Coming soon…
Based on WiMedia Alliance
specification
Retail price of $699.00
Range of 20 meters; data
rates up to 480 Mbps
Frequency band: 3.1 - 4.8 GHz
Wireless USB Implementations
Seagate Wireless USB
Hard Drive
Coming soon….
2.5 inches wide
Speeds up to 480 Mbps
Frequency range 3.1Ghz-5.6
Ghz.
Future of Wireless USB
Early : 2004
Initial devices being produced
Late :2006
WUSB started being built into laptops, PCs, multimedia devices etc.
Late :2008
Vision gain research firm predicts increase of WUSB by 400 percent
2009-2010
Wide scale applicability?
Concluding Thoughts
Appears well designed
provides good support
Slow start of products consumption !
Will it really catch on?
More products need to be developed
Promises a lot
Security is very important
Hence keeping the eyes on it just thinking
