Bluetooth system composition
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Bluetooth system composition
1. Bottom hardware module.
The underlying hardware module of Bluetooth technology system is managed by baseband, frequency hopping and link. Among them, baseband is to complete the transmission of Bluetooth data and frequency hopping. Wireless frequency hopping layer is a kind of microwave which does not need to be authorized to pass through 2.4GHz ISM frequency band. Data stream transmission and filtering are realized in the wireless frequency modulation layer. This paper mainly defines the conditions that Bluetooth transceiver needs to meet when it works normally in this frequency band. Link management realizes the safety control of link establishment, connection and removal.
2. Intermediate agreement layer.
The middle protocol layer of Bluetooth technology system consists of four parts: service discovery protocol, logical link control and adaptation protocol, telephone communication protocol and serial port simulation protocol. The role of the service discovery protocol layer is to provide a mechanism for the upper application to facilitate the use of services in the network. Logical link control and adaptation protocol are responsible for data disassembly, multiplexing protocol and control of service quality, which are the basis of other protocol layer.
3. High level application.
In the system of Bluetooth technology, high-level application is the top part of the protocol layer. The high-level applications of Bluetooth technology mainly include file transfer, network and LAN access. Different kinds of high-level applications are a kind of wireless communication realized by corresponding applications through certain application modes.