dynamic timeslots: failure when all TS are used as PDCH and the phone requests a TCH
If a phone requests a TCH channel from OsmoBTS, but all dyn timeslots are used as PDCH, the MS gets rejected completely. OsmoBTS should probably assign an SDCCH if no TCH are available, so that the MSC can then request a TCH from the BSC and trigger a change from PDCH to TCH.
There is a "paging any use tch (0|1)", so there could be a similar policy decision to assign an SDCCH instead of a TCH ... ?
As long as this is not fixed, it may be impossible for MS to dial numbers.
#8 Updated by neels about 1 year ago
- Status changed from Feedback to Rejected
ah yes, sorry for the delay.
Ok, so, quick recap to think about it:
- when MS requests a channel, even if it is TCH, OsmoBSC always assigns an SDCCH first as long as it is available.
- when no SDCCH are left, the upcoming refactored OsmoBSC will pick a TCH instead. The new timeslot and lchan FSMs will make sure that the dyn TS is switched from PDCH first, if required.
So, yeah, this should actually not be a problem anymore.