Bluetooth technology's new generation core specification version "Bluetooth 5" (Bluetooth 5), its main updates include longer transmission distance, faster transmission speed, larger broadcast data transmission volume, and interoperability with other wireless technologies and Improve coexistence. Bluetooth 5 will enable simple and easy interaction of connected devices in a wider range, thereby continuously improving the IoT experience.
The main feature updates of Bluetooth 5 include 4 times the transmission distance, 2 times the transmission speed, and 8 times the growth of broadcast data transmission volume. Longer transmission distances will support the entire home and building coverage, enabling a more robust and reliable connection. Faster speed will bring higher responsiveness and performance to the device. The increase in the amount of broadcast data transmission also enables the device to send more data to the improved solution that is more suitable for the application scenario
In addition, Bluetooth 5 still maintains a consistent low power consumption and meets the various needs of developers in devices or applications.
Technology Innovations in Bluetooth 5.0
I. Greater transmission bandwidth
The most significant improvement of Bluetooth 5.0 is that it can reach a data rate of 2 Mbps, which is achieved by changing the signal modulation method under the same power packet as Bluetooth Low Energy (Bluetooth 5 uses twice the modulation rate to obtain a comparison (In the 4.2 version, nearly twice the speed).
We know that the bandwidth of Bluetooth 5 is 4.6 times higher than the 4.0 / 4.1 version, and about 1.7 times higher than the 4.2 version. Fast data transfer. For application scenarios such as OTA firmware upgrade or wearable device data log synchronization, Bluetooth 5 will once again subvert the user experience, and higher speeds will also lay a solid foundation for future high data rate streaming.
The speed increase from 1Mbps to 2Mbps also relies on Bluetooth 5's new PHY mode:
1), LE 1MPHY-1M / s bit rate; Uncoded. The same PHY is also used in Bluetooth 4.0.
2), LECoded PHY (new)-Supports 1M / s symbol rate through error correction coding. "4x range" for Bluetooth 5.
3), LE 2MPHY (new)-2M / S symbol rate; uncoded. "2x speed" for Bluetooth 5.
Though using two new PHYs, we will get 4 times the transmission distance and 2 times the transmission speed, which will bring higher responsiveness and performance to the device.
2.Largely extended transmission range
Based on the expansion of the spectrum, Bluetooth 5 also increases the transmission range. How did that happen?
The answer is the coded way. Through a code with a half code rate and an eighth code rate, where the code at the half code rate provides a sensitivity of about 4-5dB and a nearly double range at 500 kbps; as for the eighth code One bit rate code can reach 12dB sensitivity at 125kbps and extend the transmission distance by four times.
3.More powerful broadcast performance
In Bluetooth 4.0, all broadcasts are performed on three of the 40 2.4GHz ISM band channels. With Bluetooth 5, there are now two sets of broadcast channels: the Primary broadcast channel and the Secondary broadcast channel.
Anyone who knows Bluetooth 4.0 that the broadcast payload is up to 31 octets. In Bluetooth 5, we have increased the payload to 255 bytes by adding additional broadcast channels and new broadcast PDUs, which has greatly increased the transmission of broadcast data, enabling devices to carry more broadcast packets. Data, which provides more flexibility for non-connection-oriented applications, enabling devices to send more data to improved solutions that are more applicable to the application scenario.
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