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Brings Greater Convenience and Mobility to Devices
Wireless USB(Universal Serial Bus) is a short-range, high-bandwidth wireless radio communication protocol.
Sometimes abbreviated as "WUSB", the USB Implementers Forum prefers to call the technology "Certified Wireless USB" .
Based on the WiMedia Alliance's Ultra-WideBand (UWB) common radio platform, capable of sending 480 Mbit/s at distances up to 3 meters and 110 Mbit/s at up to 10 meters.
It was designed to operate in the 3.1 to 10.6 GHz frequency range.
An upcoming 1.1 specification will increase speed to 1 Gbit/s and working frequencies up to 6 GHz.
The Wireless USB Promoter Group was formed in February 2004 to define the Wireless USB specification.
The group consists of Agere Systems (now merged with LSI Corporation), Hewlett-Packard, Intel, Microsoft, NEC Corporation, Philips and Samsung.
The first retail product was shipped by IOGEAR using Alereon, Intel and NEC silicon in mid-2007.
In 2008, a new Wireless USB Docking Station from Kensington was made available through Dell.
Minor adjustments made to fit the specific needs of a wireless system.
The function layer only suffers minor changes to increase efficiency and support isochronism.
The device layer includes wireless-oriented security and device management features.
The bus layer does not change functionality,substantially adapted for efficiency and security on wireless networks.
Data transport architecture
Transactions use TDMA microscheduling.
A split-transaction protocol is used .
The specification defines four data transfer types:-
Bulk transfers tap the channel as bandwidth is available. They use unidirectional pipes.
Interrupt transfers serve short transactions ,Maximum service period is guaranteed.
Isochronous transfers provide guaranteed transfer rates and bounded latency for transmission attempts, as well as on-average constant data rate.
Control transfers are the same as in USB 2.0.
Wireless USB minimize power consumption by the transmission/reception circuits.
Power management can also affect data transport, since devices may control their power use at their discretion.
Battery-powered operation requires reasonable battery life.
The power target for WUSB radio will be introduced at less than 300 mW and drive to a target of 100 mW over time.
W-USB interacts with wired USB via wire adapters.
It implements the USB hub-spoke model.
Connections are directed between the WUSB host and WUSB device.
Compatibility for older hardware
Allows up to 127 devices to connect directly to a host.
WUSB introduced a new Device Wire Adapter (DWA) class.
Capability can be added to existing PCs through the use of a Host Wire Adapter (HWA).
WUSB also supports dual-role devices (DRDs).
A new class of devices, called WUSB dual-role devices, These devices will offer both limited host and device capabilities similar to USB On-The-Go. E.g:-Digital camera.
Comparing digital RF systems
Provide adequate bandwidth.
With 480 Mbps being the initial target and with future process technologies, exceeding limits of 1 Gbps.
The specification is intended for WUSB to operate at less than 10 meters.
Support quality delivery of rich digital multimedia formats, including audio and video.
Capable of high rate streaming (isochronous transfers).
Used in game controllers, printers, scanners, digital cameras, MP3 players, hard disks and flash drives.
Also suitable for transferring parallel video streams.
A point distribution technology like wireless USB with an effective bandwidth of 480 Mbps could manage multiple HDTV streams.
Consumer Usage Models
Security feature includes
Key management and
For protecting outgoing frames, AES(Advanced Encryption Standard) CCM mode with 128 bits key stream is used.
To use security features, WUSB utilizes three cryptographic keys; master key, pair-wise temporal key (PTK) and group temporal key (GTK).
UWB(Ultra Wide Band)
A wireless technology for transmitting large amounts of digital data over a wide spectrum of frequency bands with very low power for a short distance.
Works on sender –receiver model.
Capability of carrying huge amount of data to a large distance as well as can go in obstacle also.
Application- In Radar, In voice and data transmission.
Relation to ultra-wideband (UWB)
A common source of confusion is about the relationship between WUSB, WiMedia, and UWB.
UWB is a new type of radio communication using pulses of energy which spread emitted Radio Frequency energy .
UWB is not specific to WiMedia or any other company or group
WUSB is a protocol promulgated by the USB-IF that uses WiMedia's UWB radio platform.
WUSB in the Future
The first Wireless USB implementations will likely be in the form of discrete silicon.
These may include add-in cards and dongles along with embedded solutions to support the technology's introduction and subsequent rapid ramp up.
But the wireless future will arrive once WUSB, along with the common ultra wideband platform, becomes a standard part of every processor and chipset and is integrated in CMOS silicon.
As the latest iteration of USB technology, wireless USB (WUSB) will offer the same functionality as standard wired USB devices but without the cabling.
As the new Wireless USB Promoter Group prepares to develop the specifications that will help standardize the technology, the industry is planning products that can take advantage of the convenience and mobility that this new device interconnect will offer.