Hi all,
Thomas, please look at my original blogpost. I focussed on LoraWan not Lora, for LoraWAN there are only 3 data channels in the specifications for Europe. In the simulation of Sigfox I used 300 Hz instead of 100, exactly to take into account channel interference. About the detection of a signal when multiple signals collide event in it own datasheet Semtech states this is only possible when the SF is different.
30 second updates are only possible in SF6 with 25 bytes packets (so only few bytes payload) since you have to adhere to the 1% duty cycle. with SF12 1 25byte message almost takes 1 s, which means first next transition in 1.5 minutes (even in the case of a retry). about the TX power and ADR (ADR means scaling with the SF) but in any case when the network enables SF6 in all cases this is the best. the TX power, I mentioned in the last paragraph of my blog.
My main point, with WAN (in every technology) your application will be impacted by other users (even using other providers) when using unlicensed bands. It does not matter what the rules of the gateway of the provider are. you are not using this network alone. It also means that you are never guaranteed that your communication will work. Don't get me wrong, I love and encourage what is happening with LWPAN networks such as LoraWAN and Sigfox. But is is also imporant the people are educated well, there are to many misleading commercially driven posts.