What´s inside of Radio Stack?

[luiggi]

As per the xda-developers Wiktionary:
"The radio stack is responsible for the phone functionality of the Hermes (or any other...). This includes GPRS, GSM and UMTS operations"

Fine! Now, What are the bolts and nuts that make a radio to work better or worst than other for such and such operator and devices? Like: Better signal, Clearer voice / sound from one side or the other, Drop calls, Lost calls.... etc.

[Rudegar]

not sure what you ask but the radio stack is embedded software for the chip in the gsm/umts module in the device's
newer versions could both be fixing issues and interducing new ones if they are unlucky

[luiggi]

not sure what you ask but the radio stack is embedded software for the chip in the gsm/umts module in the device's
newer versions could both be fixing issues and interducing new ones if they are unlucky

Well, we can add your description to the xda-developers wiktionary, thanks!

But I´m trying to dig in more detail on what precisely makes the "newer versions could both fix issues and introduce new ones", I´ll edit the original post to try to make myself clearer.

[Rudegar]

without having looked into it
i'd guess it was a dsp and the radio stack was the embedded
software which makes the dsp chip do the
gsm demodulation and downmixing

what makes the difference is most likely just timings
and possible different resolutions of the filters
the better the filter the worse the timing
so it's really about the balance
and varies between different operations and the age of their
gsm equipment