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For more on the rivalry between Bluetooth and Kleer s technology, see Richard Nass s article Bluetooth Competition Heats Up (http://embeddedcom/columns/esdeic/197008829)
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80211 a/b/g/n Standard WLAN technology can be employed for some of Bluetooth s standard uses, but 80211 is typically used for infrastructure connectivity where clients need full network connectivity (typically TCP/IP) Additionally, cost, power consumption, and configuration complexity will tend to be much higher with 80211 systems It is expected that both 80211 wireless networking and Bluetooth will continue to develop and thrive in their respective target markets without a great deal of functional crossover between the two technologies HiperLAN (1 and 2) A wireless networking standard managed by the European Telecommunications Standard Institute (ETSI) More similar in functionality to 80211 wireless networking, HiperLAN technology has been around since the early 1990s, but its market penetration is nowhere near either Bluetooth or 80211 WLAN
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For more on the HiperLAN standard, see the ETSI website (wwwetsiorg/website/technologies/ hiperlanaspx)
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HomeRF An obsolete wireless networking specification that was intended to provide personal device connectivity The working group that managed the specification was disbanded as 80211 and Bluetooth became more widespread Although there are a number of alternatives, the market momentum of Bluetooth in conjunction with its well organized and supported SIG will make Bluetooth an ideal choice for WPAN connectivity for mobile application developers for the foreseeable future
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The most current Bluetooth version is v21 + EDR, which was published in July 2007 The next major release (likely to be v30, code-named Seattle ) is designed to have much higher transmission speeds, faster connection speeds, and may include support for Ultra-Wideband (UWB) and WLAN technology In addition, versions using even lower power levels are on the Bluetooth roadmap (see wwwwirelessweek com//Bluetooth-SIG-2009-Updateaspx)
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The Bluetooth specification covers all aspects of Bluetooth implementation, including radio operation, topology of Bluetooth networks, individual Bluetooth device identification, and modes of operation Additionally, the specification defines the various components of the Bluetooth stack and outlines the concept of Bluetooth profiles for aggregating and packaging functions associated with common Bluetooth use cases
Radio Operation and Frequency
Bluetooth radios operate in the unlicensed ISM band at 24GHz (also used by 80211 networking equipment, microwave ovens, and many cordless phones) Bluetooth radios implement frequency-hopping spread spectrum for data transmission Transmission rates are up to 1Mbps for most devices, although devices running
Mobile Application Security
Power Class
1 2 3 Table 10-1
Maximum Output Power
100 mW (20 dBm) 25 mW (4 dBm) 1 mW (0 dBm)
Designed Operational Range
~ 330 feet ~ 33 feet ~ 3 feet
Sample Devices
Bluetooth access points, dongles Keyboards, mice Mobile phone headsets
Bluetooth Radio Power Classes
Enhanced Data Rate (available with Bluetooth versions 20 and 21) can have rates up to 2Mbps or 3Mbps The Bluetooth specification defines three transmitter power classes The class of radio used for a Bluetooth device is determined primarily based on usage and proximity requirements and power availability (that is, AC powered versus battery powered) Table 10-1 summarizes the power classes defined by Bluetooth Note that in addition to the maximums specified by each power class, communicating Bluetooth devices can also negotiate the power of the radio link used for communication, which can help conserve power and optimize connectivity for particular links
Bluetooth Network Topology
Much like 80211a/b/g networking, Bluetooth devices can connect in an infrastructure mode (via a centralized Bluetooth access point/base station) or in ad hoc mode, where Bluetooth devices make dynamic connections among themselves without the aid or use of a centralized network infrastructure Ad hoc mode is much more common and better suited for Bluetooth s WPAN connectivity goals and is the networking topology that this chapter focuses on Bluetooth devices organize themselves dynamically in network structures called piconets Piconets contain two or more Bluetooth devices within physical range of each other that share a frequency-hopping sequence and an operating channel Typical examples of Bluetooth piconets would be a mobile phone with a wireless headset or a desktop computer with a Bluetooth keyboard and mouse Each piconet has one device called the master (which establishes the network s operating parameters) and up to seven active slave devices Through various network and radio control techniques, devices are able to belong to multiple piconets simultaneously, although a device may only be a master in one piconet A scatternet is an arrangement of piconets where one or more devices acts as a master in one piconet and a slave in one or more additional piconets Figure 10-1 illustrates some typical piconet/scatternet arrangements
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