How to get Packet Reception Ratio in nRF54L15

[Ziyao Zhou]

Hi,

I am wondering whether I can easily get Packet Reception Ratio in nRF54L15?

[Håkon Alseth]

Hi,

 

I am not sure which physical (PHY) parameter you are specifically after here, but direct_test_mode can provide information related to the RX PHY evaluation.

radio_test can also be setup in such a mode.

 

Kind regards,

Håkon

[Ziyao Zhou]

Thank you so much for your information!

[Håkon Alseth]

Happy to help out! please let me know if you run into any issues or have questions.

 

Kind regards,

Håkon

[Ziyao Zhou]

Hi,

I just find some time to test the radio_test but there is no result telling me the PRR, does it mean I need to check the pattern by myself and caluculate the PRR?

In addition, I use the radio_test to test the throughput of the BLE_2Mbits code, I transmit the default 256 bytes packet in one minutes and calculate. The result (1899383.467bps) is different from the Bluetooth: Throughput (1396017bps). Is this because the radio_test eliminated the influence of the header?

Another question would be what is the difference between 4MBIT_BT_0_6 and 4MBIT_BT_0_4，the result is close around 3.8Mbits, what is the difference between BT=0.6 and 0.4? When would it be available for practical use?

The trend I get is like this

Thank you so much for your help!

[Håkon Alseth]

Hi,

 

Ziyao Zhou said:

The result (1899383.467bps) is different from the Bluetooth: Throughput (1396017bps). Is this because the radio_test eliminated the influence of the header?

radio_test will setup a transmit only stream, while bluetooth LE will use the protocol, including on-air ACKing, timing-wise scheduling, and changing RF channel.

Ziyao Zhou said:

Another question would be what is the difference between 4MBIT_BT_0_6 and 4MBIT_BT_0_4，the result is close around 3.8Mbits, what is the difference between BT=0.6 and 0.4? When would it be available for practical use?

The difference is the GFSK filter parameter in these two modes, the throughput will be equal/similar.

 

Ziyao Zhou said:

I just find some time to test the radio_test but there is no result telling me the PRR, does it mean I need to check the pattern by myself and caluculate the PRR?

You can setup for instance 1000 packets to be sent, and you can get the status on the receiver end, by providing a number to the "start_tx_modulated_carrier" cmd:

https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/peripheral/radio_test/README.html#user_interface

 

Kind regards,

Håkon

[Ziyao Zhou]

Got it! Thank you so much!