Bug #4955
closed
CSN1 Error observed: NEED_MORE BITS TO UNPACK (-5) at DL_DualCarrierForDTM
Added by keith about 3 years ago.
Updated over 2 years ago.
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.
Files
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)
and:
csnStreamDecoder: error NEED_MORE BITS TO UNPACK (-5) at QPSK_MEAN_BEP (idx 181)DRLCMACUL
- Status changed from New to In Progress
- Assignee changed from keith to fixeria
It looks pretty much like a mistake in TS 44.060:
The payload is: '4017e5b2cd5a2eca68655e44aec84880139300412b2b2b'O.
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.
- Status changed from In Progress to Feedback
- Assignee changed from fixeria to keith
I'm not sure if @fixeria's patch got implemented elsewhere.
The most commonly seen CSN error now is
<0000> ../../git/src/csn1.c:252 csnStreamDecoder: error
NEED_MORE BITS TO UNPACK (-5) at MultislotCapabilityReductionForDL_DualCarrier (idx 64)
- Related to Bug #5250: osmo-pcu: CSN.1 decoder failure parsing specific RAcap added
- Status changed from Feedback to Closed
This issue looks most likely fixed with the above patches.
Let continue if needed in #5250
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