RE: In BLE communication system, does high speed mode bring improvement in transmission speed?

Kawahara — Wed, 10 Aug 2022 06:58:38 GMT

Thanks for your response.

I understood this speed mode options do not affect to transmission speed.

In addition, thank you for introducing about throughput example.

We are going to think about improvement of transmission speed with it.

RE: In BLE communication system, does high speed mode bring improvement in transmission speed?

Einar Thorsrud — Wed, 10 Aug 2022 06:36:37 GMT

Hi,

[quote user=""]1. Does "<2=> High speed" in figure mean high speed mode added by Bluetooth Ver3.0 which achieves 24 Mbps as theoretical value?[/quote]

No. The configurations you are referring to here are related to the comparator (COMP) peripheral, and have nothing to do with Bluetooth. Moreover, the nRF devices only support Bluetooth LE (introduced in Bluetooth 4.0), and what you refer to here is only relevant for classic Bluetooth, which is not supported by the nRF devices.

[quote user=""]2. Does "SPEED_MODE" value change have effect transmission speed in BLE.[/quote]

No, it is completely unrelated.

There are things you can do to improve throughput, but it seems you have done the most important things (use long packets, use event lengths that are equal to the connection interval). If you want to experiment more with these parameters I suggest you take a look at the throughput example. Note that this requires you to have nRF devices in both ends. The practical throughput you can get with a mobile phone/tablet is typically significantly less, varies between devices, and varies between various conditions (for instance, if the device also communicate with other Bluetooth devices and/or use WiFi at the same time).