RE: About Adaptive Frequency Hopping (AFH)

Håkon Alseth — Wed, 29 Aug 2018 07:34:02 GMT

Hi,

[quote user=""]Do Nordic stack keep track of some bad channels during communication and would skip the bad channels next time or there is no measurement of failure rate on a channel to black list it?[/quote]

No, the SoftDevice does not do this.

[quote user=""]If there is no way to skip bad channels in BLE stack automatically, is there any solution we can skip the bad channels in application level? I know channel map is one of the solution but I want to know if I can count the failure rate on each channel during communication and setup a proper channel map over time.[/quote]

A channel map update is driven by the master side. The problem here is that the Softdevice stack does not expose meta data, like re-transmits on a given RF channel etc, so this isn't easy to implement. Phones usually ban their currently used wlan channels to avoid overlap.

[quote user=""]3. What is the range of channel map? Can I just use 1 channel if needed?[/quote]

The minimum, per the bluetooth core spec v5 (vol 6, part B, chapter 4.5.8.1), is 2.

Kind regards,

Håkon