Cellular Network Infrastructure » Radio Access Network » OsmoPCU

PCU in EGRPS mode is crashing within 10 to 20 seconds on a BTS with many UE.

The log leading up to this generally looks like:

<0008> ../../git/src/tbf.cpp:996 Allocating UL TBF: MS_CLASS=12/12
<0008> ../../git/src/tbf.cpp:1012 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=NULL EGPRS) Enabled EGPRS, mode EGPRS
<0002> ../../git/src/gprs_rlcmac_ts_alloc.cpp:749 No USF available
<0002> ../../git/src/gprs_rlcmac_ts_alloc.cpp:396 [UL] algo A <single> (suggested TRX: 0): failed to allocate a TS, no USF available
<000a> ../../git/src/tbf_ul.cpp:606 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=NULL EGPRS) setting EGPRS UL window size to 0, base(64) slots(0) ws_pdch(0)

Assert failed ws >= RLC_GPRS_SNS/2 ../../git/src/rlc.cpp:255
backtrace() returned 0 addresses
Signal 6 received.