Bug #4614
open"bogus channel load sample" when using BS-11, Nokia or Ericsson BTS
30%
Description
Mon Jun 15 15:36:12 2020 DRLL chan_alloc.c:208 (bts=0) bogus channel load sample (used=0 / total=0) Mon Jun 15 15:36:13 2020 DRLL chan_alloc.c:208 (bts=0) bogus channel load sample (used=0 / total=0)
Also, interestingly:
OsmoBSC> show trx
TRX 0 of BTS 0 is on ARFCN 121
Description: (null)
RF Nominal Power: 24 dBm, reduced by 0 dB, resulting BS power: 24 dBm
NM State: Oper 'NULL', Admin 'Unlocked', Avail 'Power off'
RSL State: connected
Baseband Transceiver NM State: Oper 'NULL', Admin 'unknown 0x0', Avail 'Power off'
E1 Signalling Link:
E1 Line 2, Type dahdi: Timeslot 1, Mode RSL
E1 TEI 1, SAPI 0
I think the problem is that the Siemens BS-11 MO structure is quite unlike what TS 12.21 describes, so the baseband transceiver object is simply never initialized.
The " OC=SIEMENSHW INST=(03,00,00)" might be can idea?
Updated by laforge almost 4 years ago
- Subject changed from "bogus channel load sample" when using BS-11 BTS to "bogus channel load sample" when using BS-11 BTS or Ericsson BTS
- Category set to Ericsson BTS
Also appears on RB2308:
<0000> chan_alloc.c:208 (bts=0) bogus channel load sample (used=0 / total=0)
Updated by laforge almost 4 years ago
- Subject changed from "bogus channel load sample" when using BS-11 BTS or Ericsson BTS to "bogus channel load sample" when using BS-11, Nokia or Ericsson BTS
also appears when using an InSite.
Updated by laforge almost 4 years ago
- Status changed from New to In Progress
- % Done changed from 0 to 30
I think there is a wrong assumption in the code that prints the message. A total count of logical channels of '0' is perfectly valid for any BTS until it is operational.
The code tries to implement this in trx_is_usable() which is not implemented for most BTS models:
bool trx_is_usable(const struct gsm_bts_trx *trx)
{
/* FIXME: How does this behave for BS-11 ? */
if (is_ipaccess_bts(trx->bts)) {
if (!nm_is_running(&trx->mo.nm_state) ||
!nm_is_running(&trx->bb_transc.mo.nm_state))
return false;
} else if (is_ericsson_bts(trx->bts)) {
/* The OM2000 -> 12.21 mapping we do doesn't have separate bb_transc MO */
if (!nm_is_running(&trx->mo.nm_state))
return false;
}
return true;
}
Since this is highly BTS model specific, the function should actually likely become part of bts_model_*, where it needs to be implemented for all BTS models. That requires testing on all of those.
An interim patch simply disables the message for the 'total == 0' situation: https://gerrit.osmocom.org/c/osmo-bsc/+/19132
Updated by laforge about 3 years ago
- Status changed from In Progress to Stalled
- Priority changed from Normal to Low
