GPRS vs. voice with openbsc

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Ralph A. Schmid, dk5ras ralph at schmid.xxx
Mon Feb 3 15:35:28 UTC 2014


> maybe try this:
> use a gamma of 0. (this means that the maximum power of your phone is not

This I already am using, with only partial success, reaching about 10%
coverage, compared to voice.

> reduced.) use an alpha of 0. (this means no reduction depending on the

With the alpha I did not yet play very much, has to be tested this evening
:)

> downlink RSSI.) also be sure to set MS_TXPWR_MAX_CCH to 33dbm, so the
> maximum allowed output power of the mobile is 2w, if supported. (at
> openbsc the parameter is "ms max power 33")

My license allows only 100mW :) Anyway, this leads to jamming the receiver
when nearby subscribers drive the AGC (?) into limiting the signal, and not
recovering fast enough to decode the next (weaker) timeslot.

> best regards,
> 
> andreas

Ralph.






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