Bug #4955
CSN1 Error observed: NEED_MORE BITS TO UNPACK (-5) at DL_DualCarrierForDTM
0%
Description
Repeats 4 times. Also no newline at the end of this log line:
DCSN1 <0000> ../../git/src/csn1.c:1468 csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at DL_DualCarrierForDTM (idx 71)DCSN1 <0000> ../../git/src/csn1.c:1468 csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at DL_DualCarrierForDTM (idx 71)DCSN1 <0000> ../../git/src/csn1.c:1468 csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at DL_DualCarrierForDTM (idx 71)DCSN1 <0000> ../../git/src/csn1.c:1468 csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at DL_DualCarrierForDTM (idx 71)
Assigning to myself at least until I add a pcap.
History
#1 Updated by keith about 1 month ago
Another CSN Error observed. Need to try to grab a pcap of this one too.
DCSN1 <0000> ../../git/src/csn1.c:252 csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at p32QAM_HSR_CV_BEP (idx 182) DRLCMACUL <0005> ../../git/src/pdch.cpp:712 Dropping Uplink Control Block with invalid content, decode failed: -5)
#2 Updated by keith about 1 month ago
and:
csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at QPSK_MEAN_BEP (idx 181)DRLCMACUL
#3 Updated by keith about 1 month ago
- File QPSK_MEAN_BEP.pcap QPSK_MEAN_BEP.pcap added
#4 Updated by keith about 1 month ago
- File p32QAM_HSR_CV_BEP.pcap p32QAM_HSR_CV_BEP.pcap added
#5 Updated by keith about 1 month ago
#6 Updated by fixeria about 1 month ago
- Status changed from New to In Progress
- Assignee changed from keith to fixeria
It looks pretty much like a mistake in TS 44.060:
- Wireshark fails to decode the packet,
- Pycrate also fails to decode the packet,
- http://lte-3gpp.info/decode_ts44060.php decodes it successfully.
The payload is: '4017e5b2cd5a2eca68655e44aec84880139300412b2b2b'O.
#7 Updated by keith about 1 month ago
Another Payload observed is
x2f x83 x61 xfa x14 x14 x26 x86 x56 x4b x2c xcc x00 x40 x01 x70 x0b x2b x2b x2b x2b x2b(formatted for pasting into http://lte-3gpp.info/decode_ts44060.php)
This is the case of the DL_DualCarrierForDTM Error, is observed regularly and is an MS RAC IE.
While the other errors are always followed in the log with "Dropping Uplink Control Block with invalid content...", this one is not. Wireshark decodes the payload correctly. An example payload can be found in the pcap, towards the end.
#8 Updated by fixeria about 1 month ago
- Status changed from In Progress to Feedback
- Assignee changed from fixeria to keith
Here is my attempt to fix 'QPSK_MEAN_BEP' related decoding errors: https://gerrit.osmocom.org/c/osmo-pcu/+/22524.
Unfortunately, I don't have time to work on this anymore :/
Best regards,
Vadim.
