openbts-p2.8-gprs-exp and pcu issues

jolly andreas at
Sat Oct 27 05:24:57 UTC 2012

jolly wrote:
> the second problem is wrong scheduling. if you would have set drlcmac
> debugging, you would see when polling is scheduled. the scheduled FN
> must be 13 bursts (3 blocks) in advance of the RTS FN. 8 or 9 bursts
> later, the scheduler must schedule "free USF for polling" for the next
> block, which is 4 or 5 bursts later. since i don't see the drlcmac
> debugging in your log, i cannot verify it.
it seems to work in the beginning, but later the transmission seems to
be shifted at the BTS. when the BTS sends the RTS with a given FN, the
PCU assembles a block for that FN and sends it to the BTS. the BTS must
send that block at the given FN (or drop it, if it is too late). it must
not send it at a different FN.

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