A packet (e.g., an IPv6 packet)
         |                                           ^
         v                                           |
+------------------+                      +--------------------+
| SCHC Compression |                      | SCHC Decompression |
+------------------+                      +--------------------+
         |                                           ^
         |   If no fragmentation (*)                 |
         +-------------- SCHC Packet  -------------->|
         |                                           |
         v                                           |
+--------------------+                       +-----------------+
| SCHC Fragmentation |                       | SCHC Reassembly |
+--------------------+                       +-----------------+
      |     ^                                     |     ^
      |     |                                     |     |
      |     +---------- SCHC ACK (+) -------------+     |
      |                                                 |
      +-------------- SCHC Fragments -------------------+

        Sender                                    Receiver

*: the decision not to use SCHC fragmentation is left to each Profile
+: optional, depends on Fragmentation mode