Use QN908x to implement higher data transparent transferring rate

25 Jun 2018

Up to date, more and more products with BLE appears in our life such as Smart Band, Lighting, Weight Scale and other BLE peripherals.

Bluetooth Low Energy(BLE) technology is characterized by low power consumption, which is generally used in small packet, low data rate for control and data exchange scenarios particularly in the Smart Home, Health, Sport and Fitness industries. But in some case BLE is required to increase data rate to higher level for specific usage, like firmware OTA update, voice transmission etc. QN908x MCU family of NXP can meet the kind of requirements perfectly. QN908x can get very low static and dynamic power consumption, and to reach higher throughput while needed a specific profile named QPP Private Profile is developed and released in QN908x SDK. QPP Private Profile is based on GAP/GATT, comprised of self-defined service and characteristics to implement raw data transparent transferring between two devices.

In BLE technology the data rate between two BLE devices depends on the setting of connection interval and the symbol rate of physical layer. QN908x provides two PHY modes, 2Msps and 1Msps.

Below table shows the data throughput between two QN9080DK boards.

PHY mode	Connection Interval	ATT MTU	CE data Length	QPP Package Length	Notification Speed
2Msps	20ms	247	251	244	1070 kbps
1Msps	20ms	247	251	244	660 kbps
Note: If the connection interval is shorter, the speed can be higher.

Below table shows the data throughput between QN9080DK board and Android phone.

PHY mode	Connection Interval (ms)	ATT MTU	LE Data Length	QPP Package Length	Notification Speed (QPP demo)
2Msps	20ms	247	251	244	1039kbps
1Msps	20ms	247	251	244	413kbps
Note: HW: QN9080 DK and XiaoMi 6 with Andriod v7.1.1 App on phone: QPP Demo, it is contained in IoT Toolbox which can be downloaded from google play

Below table shows the data throughput between QN9080DK board and iPhone.

PHY mode	Connection Interval (ms)	ATT MTU	LE Data Length	QPP Package Length	Notification Speed
2Mbps	30ms	210	251	244	260kbps
1Mbps	30ms	247	251	244	188kbps
Notes: HW: QN9080 DK and iPhone7 with iOS 11.3.1 App on phone: LightBlue

For more info, visit www.nxp.com/QN908x and www.nxp.com/QN908xDK or contact https://www.nxp.com/support.