Figure 5-2 shows the reference protocol model described in IEEE 802.16. The MAC encompasses three sublayers:
The service-specific convergence sublayer (CS)
MAC common part sublayer (CPS)
The service-specific CS provides mapping of external network data, received through the service access point (SAP) into the MAC service data units (SDUs). MAC SDUs are received by MAC CPS through the MAC SAP. Classifying external network SDUs and associating them to the appropriate service flows and connection identifiers (CIDs) is done by this part of the MAC sublayer. Multiple specifications are provided ...