Question #181462 on rohc changed:
https://answers.launchpad.net/rohc/+question/181462
Status: Open => Answered
Didier Barvaux proposed the following answer:
Hello,
The "feedback curr" trace represents a sort of ratio of decompression failures
over decompression successes:
- Every time the decompressor succeeds to decompress a packet, it removes
"okval" from "curval".
- Every time the decompressor fails to decompress a packet, it adds "errval" to
"curval". If "curval" is greater than "maxval" and the decompressor is not in
undirectional mode, then a Negative ACK (NACK) is transmitted to the
compressor.
- Every time the decompressor processes a packet (ie. both success or failure),
it compares 'curval' to 'maxval'.
Does it clarify the situation?
The names of variables (curval/errval/okval/maxval) were badly chosen. And the
overall
algorithm is not documented. One task more to add to the TODO list I think :-)
Regards,
Didier
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