+-----------------------------------------------------+
   |   User Payload, e.g., IP Protocol Data Unit (PDU)   |
   +-----------------------------------------------------+

+-----------------------------------------------------------+
|  +-----------------------------------------------------+  |
|  | Multi-Access (MX) Convergence Layer                 |  |
|  +-----------------------------------------------------+  |
|  +-----------------------------------------------------+  |
|  | MX Adaptation   | MX Adaptation   | MX Adaptation   |  |
|  | Layer           | Layer           | Layer           |  |
|  | (optional)      | (optional)      | (optional)      |  |
|  +-----------------+-----------------+-----------------+  |
|  | Access #1 IP    | Access #2 IP    | Access #3 IP    |  |
|  +-----------------------------------------------------+  |
|                            MAMS User-Plane Protocol Stack |
+-----------------------------------------------------------+