【文章內(nèi)容簡介】 as to trade products with the Bluetooth requirement and logo, manufacturers should be associates of the SIG and the devices should meet welloutlined credentials. These procedures make sure that Bluetooth wireless devices international may converse with each other, apart from pany or nation of derivation.Speed and RangeRange is application specific and although a minimum range is mandated by the Core Specification, there is not a limit and manufacturers can tune their implementation to support the use case they are enabling. Range may vary depending onclass of radio used in an implementation: Class 3 radios – have a range of up to 1 meter or 3 feet Class 2 radios – most monly found in mobile devices , have a range of 10 meters or 33 feet Class 1 radios – used primarily in industrial use cases , have a range of 100 meters or 300 feetThat creates Bluetooth technology appropriate for transporting lesser files for example cell phone contracts and text documents, also as lowerquality pictures and audio (Kumkum, 160162). At these relocate speeds。 Bluetooth may not actually deal streaming video or highquality pictures and audio at this end, except this possibly will alter in the future when fresh Bluetooth standards are initiated.Simple and Competent to UtilizeCreating and configuring Bluetooth allowed devices is moderately unplicated, with little extra motion than acquire the two devices close to one another and twist them on. There is no requirement to mount drivers or further software to plex an adhoc, personal wireless network (Kumkum, 160162). It has a uniform organization, meaning that some two wireless products attributing Bluetooth technology, despite of product or nation of origin, have the ability to converse faultlessly with each other.Common ApplicationsOne of the mainly ordinary applications of Bluetooth is handsfree cell phone procedure. About each cell phone fashioned in our day has constructed Bluetooth (Meier, 1520). Only pair phone with a Bluetooth headset, and he may talk whereas his phone is in his purse or pocket. Several of today’s car stereos as well have fitted Bluetooth for handsfree calling in his vehicle. And if his vehicle has a plant stereo or grownup aftermarket one that he merely doesn’t wish to restore, he may yet like handsfree identifying with a Bluetooth car kit.Bluetooth Bluetooth is the fresh Bluetooth wireless typical adopted through the Bluetooth SIG on April 21, 2009. The fresh standard supports elevated data remove speeds and constructs ahead the preceding standards (Meier, 1520). With its superior speed, the technology has the probable to transfigure the consumer electronics industry.TechnologyPROTOCOLThe Bluetooth technology standard is set to make different applications can “municate” with each other. Remote devices in munication use the same protocol stacks, while different applications need different protocol stacks. But, every application needs the data link layer and physical layer of the Bluetooth technology. The whole Bluetooth protocol stacks is shown as blow. Not any application should use all of the protocols, but one or some lists of these. The chart below shows the relationship between protocols, but the relationship may change in some applications.The pletely protocol stacks include Bluetooth special protocols (like LMP and L2CAP) and not special ones (such as OBEX and UDP). The basic principle for designing protocol and protocol stacks is that use existing high level protocol as possible, ensure the bination of protocols and Bluetooth technology, and take the best advantage of the software and hardware which adapt to the Bluetooth technology standards. The open Bluetooth technology makes device manufacturers can choose protocols freely as they like or used to.The protocols in Bluetooth protocol systemThere are four layers in Bluetooth protocol system according to the SIG Core protocols Cable replacement protocols Telephony control protocols Adopted protocolsExcept the protocol layers above, the standard also defines Host/Controller Interface (HCI),which provides mand interface for baseband controller, connection manager, hardware state and control register.Bluetooth core protocols consist of the special protocols made by SIG. Most Bluetooth devices need core protocols, while other protocols are used depend on needs of the application. After all, cable replacement protocols, technology control protocols and adopted protocols based on the core protocols constitute the objectoriented protocols. Core protocols LMP (Link Management Protocol)Used for control of the radio link between two devices. Implemented on the controllers.It identifies and encrypts through launching, exchanging and checking the connection, and decides the size of baseband data packets through conference. It also controls the power mode and work cycle of wireless equipment, and connection status of unit equipment in piconet. L2CAP (Logical Link Control amp。 Adaptation Protocol)This protocol is used to multiplex multiple logical connections between two devices using different higher level protocols, and provides segmentation and reassembly of onair packets.In Basic mode, L2CAP provides packets with a payload configurable up to 64kB, with 672 bytes as the default MTU, and 48 bytes as the minimum mandatory supported MTU.In Retransmission amp。 Flow Control modes, L2CAP can be configured for reliable or isochronous data per channel by performing retransmissions and CRC checks.Bluetooth Core Specification Addendum 1 adds two additional L2CAP modes to the core specification. These modes effectively deprecate original Retransmission and Flow Control modes: Enhanced Retransmission Mode (ERTM): This mode is an improved version of the original retransmission mode. This mode provides a reliable L2CAP channel. Streaming Mode (SM): This is a very simple mode, with n