Interpretation of Bluetooth Core Protocol v6.1
1. Bluetooth FrameworkThe Bluetooth protocol stack consists of the host, HCI to the controller, and finally to the RF transmitter.The following diagram shows the complete structure of the Bluetooth controller, which has been basically formed since Bluetooth 4.0:
The controller is further divided into BR/EDR, AMP, and LE. Among them, AMP (Bluetooth 3.0) has been deprecated and removed starting from v5.3. The section in volume 5 below is no longer in use.
Bluetooth belongs to the PAN (Personal Area Network) and shares the 2.4GHz frequency band with the original LAN (Local Area Network) protocol Wi-Fi.2. Network ModelFrom the perspective of the OSI network model, the L2CAP layer of Bluetooth plays an important role, fulfilling part of the functions of the network layer, transport layer, and data link layer.
(The L2 layer on the left is the data link layer)The detailed architecture of the Bluetooth controller is shown in the following diagram, divided into classic Bluetooth BR/EDR on the left and low energy Bluetooth LE on the right.
Classic Bluetooth: Currently, almost all Bluetooth audio scenarios in the market are implemented using classic Bluetooth.Low Energy Bluetooth:Devices such as wristbands and smartwatches use low energy Bluetooth.3. Bluetooth RFThe Bluetooth controller interfaces with the radio/RF module to modulate digital signals into analog signals, as mentioned in the previous chapter regarding GFSK Gaussian Frequency Shift Keying.
Welcome to follow: Previous exciting topics on Bluetooth 6.0, GFSK Gaussian Frequency Shift Keying, why classic Bluetooth inquiry scan and page scan have been replaced by BLE’s adv/scan? What Bluetooth 3.0 failed to achieve, Star Flash 3.0 has taken over.