PRIYA RANJAN PRIYA RANJAN Branch- Branch- ETC(4 ETC(4 th th year) year) Reg. No- Reg. No- 0501222042 0501222042
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PRIYA RANJANPRIYA RANJAN
Branch-ETC(4Branch-ETC(4thth year) year)
Reg. No-0501222042Reg. No-0501222042
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.
It is Preserved 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.
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.
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.
Specification
Wireless USB
Specification Rev. 1.0
Bluetooth 3.0
(proposed)
IEEE 802.11n
Bluetooth 2.0 + EDR
Frequency band
3.1 GHz–10.6 GHz
UWB (not decided)
2.4 GHz/5 GHz 2.4 GHz
Bandwidth480 Mbit/s / 110 Mbit/s
53 - 480 Mbit/s Max. 600 Mbit/s Max. 3 Mbit/s
Distance 3 m / 10 munknown distance
100 m1 m–100 m,
depending on output
Modulation MB-OFDM MB-OFDMDSSS, DBPSK,
DQPSK,CCK, OFDM
GFSK
Wireless USB vs. 802.11a/b/g & Bluetooth
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.
Security feature includes
Encryption
Integrity check
Key management and
Authentication methods.
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).
A master key :-Used for generate all kinds of temporally used keys including the PTK and the GTK. A PTK :-Protects any unicast traffic between two ends sharing it for a session. A GTK :-A session key shared among members in a network or in a group.
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.
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.
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.
Wireless Universal Serial Bus Specification, Revision 1.0
Nikkei Electronics http://www.wimedia.org/en/resources/
worldwide_regulatory.asp http://www.instat.com/catlog/Ccatlogue.asp http://www.deviceforge.com/articles http://www.whatis.techtarget.com/definition
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