hi,
we managed to run a nokia flexi bts with openbsc. the bts type is
"nokia-site".
on channel request, the bts nacks the channel activation with cause 0x65
(protocol error, optional information element). by removing the Channel
Identification IE from the channel activation message, everything
worked, so we assume that this IE causes this error. we tried to modify it:
- no zero-length Mobile Allocation included in Channel Identification IE
- TLV instead of TV for Channel Description in Channel Identification IE
- Channel Description in Channel Identification IE with type 0x62
instead of 0x64
all of these modifications result in the same error. so we came to the
conclusion to remove the Channel Identification IE, since it is not
really required. attached is the preview patch.
does anyone have ABIS traces of a real network, to check how the IE is
encoded there? is there any way to get more information from nokia bts
why it rejects the channel when using this IE?
regards,
andreas
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