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Printable Version: RFC3095.PDF
RFC 3095 Robust Header Compression July 2001
1) If for large CIDs, the feedback will always start with a CID
encoded according to section 4.5.6. If the first bit is 0, the
CID uses one octet. If the first bit is 1, the CID uses two
octets.
2) If for small CIDs, and the size is one octet, the feedback is a
FEEDBACK-1.
3) If for small CIDs, and the size is larger than one octet, and the
feedback starts with the two bits 11, the feedback starts with an
Add-CID octet. If the size is 2, it is followed by FEEDBACK-1.
If the size is larger than 2, the Add-CID is followed by
FEEDBACK-2.
4) Otherwise, there is no Add-CID octet, and the feedback starts with
a FEEDBACK-2.
5.2.3. ROHC IR packet type
The IR header associates a CID with a profile, and typically also
initializes the context. It can typically also refresh (parts of)
the context. It has the following general format.
0 1 2 3 4 5 6 7
--- --- --- --- --- --- --- ---
: Add-CID octet : if for small CIDs and (CID != 0)
+---+---+---+---+---+---+---+---+
| 1 1 1 1 1 1 0 | x | IR type octet
+---+---+---+---+---+---+---+---+
: :
/ 0-2 octets of CID / 1-2 octets if for large CIDs
: :
+---+---+---+---+---+---+---+---+
| Profile | 1 octet
+---+---+---+---+---+---+---+---+
| CRC | 1 octet
+---+---+---+---+---+---+---+---+
| |
/ profile specific information / variable length
| |
+---+---+---+---+---+---+---+---+
x: Profile specific information. Interpreted according to the
profile indicated in the Profile field.
Bormann, et al. Standards Track [Page 47]