Analysis of Bluetooth technology

Abstract: Bluetooth is a short-range communication support equipment for radio technology, Research in recent years has become a hot topic and get a wide range of applications. In this paper, Bluetooth technology and features of talk in the origin, described in detail the composition of the Bluetooth system, Bluetooth technology, information security mechanisms and Bluetooth networking solutions, and finally the Development of Bluetooth technology are put forward.

Keywords: Bluetooth networking components of information security program
1
1.1 Bluetooth Profiles Bluetooth Bluetooth
origin of the name comes from the 10th century Danish King Harald Blatand, because he was very fond of the Blue Mei, so the teeth every day with blue. Bluetooth will then Sweden, Finland and Denmark were united together.

1999 年 12 1st, the Bluetooth Special Interest Group - Bluetooth SIG has released the latest Bluetooth standard 1.0B version. Development so far, joining the company has more than 2,000. An open global harmonization of technical specifications to get such widespread industry attention and support is unprecedented. Of course, thanks to Bluetooth technology itself has broad application prospects and attractive business opportunities.

1.2
Bluetooth technology, Bluetooth technology features high-speed frequency hopping and time division multiple access and other advanced technology, close to the most inexpensive digital equipment were several network link up.

Bluetooth is an open, short-range wireless communications technology standards. It can be used in a relatively short distance, a variety of cable to replace the current program, through walls and other obstacles, through a unified short-range wireless link between various digital devices in a flexible, secure, low cost, minor merits consumption of voice and data communications.

Bluetooth as a new short-range wireless communication technology has been widely used in various fields, which provides low-cost, low power, short distance wireless communication, constitute a fixed and mobile devices in the personal network communication environment, making variety of information devices to close the seamless sharing of resources.

2 Bluetooth system parameter index and composition of the Bluetooth system architecture
2.1 basic system parameters and indicators
working band: ISM band 2.402GHz-2.480GHz
Duplex mode: TDD
Business Category: supports both circuit switched and packet switched data service
nominal rate: 1Mbit / s
asynchronous channel rate: asymmetric connection 723.2kbit / s 57.6kbit / s
symmetric connection: 433.9kbit / s (full duplex work mode)
synchronization channel rate: 64kbit / s (3 full-duplex channels)
Channel Spacing: 1MHz
channel number: 79
transmission power and coverage: 0dBm (1mW), 1 - 10m coverage, 20dBm (100mW), extended to cover the 100m jump frequently
Points: 79 frequency / MHz (2408 k (MHz), k = 0,1,2 ... ... 78);
hopping rate : 1600 times / s
mode: Active / Sniff / Hold / Park
data connection: connection-oriented service SCO (voice, circuit switched, reserved time slot), no connection business ACL (packet data, packet switching, polling)
Error Correction: 1/3FEC (3bit repetition code), 2/3FEC (truncated Hamming code), CRC-16, ARQ
Authentication: Response means the arithmetic logic
Key: the 8bits increments, up to 128bits
security: link level, authentication based on shared link key challenge / response mechanism, authentication and encryption key generation algorithm based on SAFER
voice encoding : CVSD or PCM
the number of network topologies: Ad hoc (no center self-organization) structure, Piconet and Scatternet
2.2
Bluetooth Bluetooth system consists of the composition of the wireless unit, control unit link, link management system and software architecture and protocol composition.

2.2.1 Bluetooth antenna, wireless units are antenna, air interface is based on the antenna level is 0dBm basis, to comply with the Federal Communications Commission about 0dBm level ISM band standards.

2.2.2 Link Control Unit Link Control Unit (ie, baseband) describes the hardware - the baseband link controller, digital signal processing specifications.

2.2.3 Link Manager Link Manager (LM) software module designed to link data sets, authentication, link hardware configuration and other protocols.

2.2.4 system software architecture and protocol interoperability of Bluetooth devices should be that any Bluetooth device should be able to achieve between the interconnection, including hardware and software.

Design protocol and protocol stack as the main principle is to use existing types of high-level agreements, ensure that the existing agreements and the integration of Bluetooth technology and interoperability between various applications; full use of the software compatible with Bluetooth specification hardware system and the openness of the Bluetooth specification, to facilitate the Development of new applications. SIG specific needs according to the protocol is divided into 4 layers: core agreement, RFCOMM cable replacement agreement, TCS call control protocol and Internet-related high-level agreements with
3
Bluetooth security mechanism is based on the Bluetooth radio communication standard wave as the media, third-party information may be easily intercepted, so the Bluetooth technology must take certain security mechanisms, particularly in the electronic trading applications. In order to provide security and to use the credibility of the information, the system must be in the application layer and link layer security measures. Links to Research Papers Download http://www.hi138.com