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The Service Specific Convergence Sublayer (CS) is the upper most sublayer which sits on top of MAC-CPS (Common Part Sublayer) in the 802.16 protocol layering [802.16e]. The main task of service specific CS is to classify the packets received from external network layer and map them on to MAC CID (Connection Identifiers). The classification of the network SDUs is based on classifiers which are dependent on the higher layers. For IP specific CSs, following are the classifiers used:
- IP TOS (Type of service) or DSCP (Differentiated Services codepoint) range and mask
- Protocol
- IP Masked Source Address
- IP Destination Address
- Protocol Source Port Range
- Protocol Destination Port Range
If the classifiers get mapped to a MAC CID, the SDU alongwith CID is passed on to MAC CPS. In case there is no CID corresponding to the classifier
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