The differences between Bluetooth 5.0 and 5.2

The latest Bluetooth 5.2 technology is now officially effective in January 2020, Bluetooth 5.2 compared to the Bluetooth 5.0, the main three new features: LE synchronous channels (LE Isochronous Channels); Enhanced ATT (Enhanced ATT); LE power control (LE Power Control).

1 EATT (Enhanced Attribute Protocol). Refined in Bluetooth 5.2, EATT supports concurrent transactions, allows crossover of ATT packets from different applications with associated L2CAP packets, and allows changes to the ATT maximum transmission unit (MTU) during a connection. Overall, these changes can enhance and improve the user experience on the device by temporarily reducing the use of the stack by one application to block the use of another application when multiple applications are using the Bluetooth Low Power (LE) stack at the same time. This can reduce end-to-end latency for one or more applications and improve the user response experience. To support EATT, a new L2CAP model has been defined. This new model is called the Enhanced Credit Flow Control model based on L2CAP. This mode provides flow control and therefore allows applications to treat the protocol as reliable. EATT offers security advantages over unenhanced ATT because it can only be used over encrypted connections.

2 LE Power Control. This new low-power control allows the device to dynamically optimize the transmission power between connected devices. Bluetooth LE receivers can instantly monitor signal strength and request changes in the transmission power levels of connected devices, usually to maintain optimal signal strength in terms of signal quality and low power consumption. LE power control has the following 3 major advantages: 1. Reduces the total power consumption of the transmitter by performing dynamic power management between connected devices.  2. Improves reliability by maintaining the receiver signal strength within the optimal range supported by the receiver.  3. improve coexistence with other wireless devices in the environment that use the 2.4 GHz frequency range. This advantage applies to all such devices, not just those using Bluetooth.  So it is not difficult to imagine the application scenarios of LE power control: a. Adjusting the transmit power of both devices (TX or RX) and informing each other b. Adjusting their own transmit power based on the best value of power acceptable to both devices c. Path loss (Path Loss) can be monitored

3 LE Sync Channel. This feature is primarily designed to support LE Audio (next generation Bluetooth audio), which allows time-limited data transmission to one or more devices for time-synchronized processing. It can be used over a connection or broadcast to an unlimited number of devices in a connectionless manner. Audio sources can transmit audio for synchronized playback to small groups of private devices (personal audio sharing) or to large collections of devices of unlimited size in a public space (e.g., a movie theater). However, music sharing is only one application. LE Audio builds on the new channel of LE Sync, which will provide a new standard for receivers and support assistive listening systems in locations as diverse as theaters, conferences, lecture halls, and airports. It is expected that multilingual audio systems will become possible.

We just need to know that Bluetooth 5.2 is faster for 5.0 in transmission rate; the transmission distance is further; the transmission stability is better, and the power consumption is lower. At the same time theoretically support an audio playback device connected to multiple Bluetooth headphones, you can enjoy music on a smartphone at the same time. The future of Bluetooth technology is somewhat similar to Wi-Fi, from a one-to-one model to a one-to-many model, no matter how Bluetooth technology will certainly make our life experience better and better.