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Printable Version: RFC3095.PDF
RFC 3095 Robust Header Compression July 2001
Assuming small CIDs:
0 1 2 3 4 5 6 7
+---+---+---+---+---+---+---+---+
| 1 1 1 1 0 | 0 1 1 | feedback packet type, Code = 3
+---+---+---+---+---+---+---+---+
| 1 1 1 0 | 1 0 0 0 | Add-CID octet with CID = 8
+---+---+---+---+---+---+---+---+
| 0 0 | 1 1 | SN MSB = 0 | AckType = ACK, Mode = Reliable
+---+---+---+---+---+---+---+---+
| SN LSB = 17 |
+---+---+---+---+---+---+---+---+
The second, third, and fourth octet are handed to the compressor.
The FEEDBACK-1 format may also be used. Assuming large CIDs:
0 1 2 3 4 5 6 7
+---+---+---+---+---+---+---+---+
| 1 1 1 1 0 | 0 1 0 | feedback packet type, Code = 2
+---+---+---+---+---+---+---+---+
| 0 0 0 0 1 0 0 0 | large CID with value 8
+---+---+---+---+---+---+---+---+
| SN LSB = 17 |
+---+---+---+---+---+---+---+---+
The second and third octet are handed to the compressor.
Assuming small CIDs:
0 1 2 3 4 5 6 7
+---+---+---+---+---+---+---+---+
| 1 1 1 1 0 | 0 1 0 | feedback packet type, Code = 2
+---+---+---+---+---+---+---+---+
| 1 1 1 0 | 1 0 0 0 | Add-CID octet with CID = 8
+---+---+---+---+---+---+---+---+
| SN LSB = 17 |
+---+---+---+---+---+---+---+---+
The second and third octet are handed to the compressor.
Bormann, et al. Standards Track [Page 95]