However, MAC addresses are not used to identify the destination of
data packets.
The MAC performs several key functions such as mapping data from higher layer
protocols to WiMAX-specific PDUs, creating and maintaining connections, scheduling
of data transmissions, authenticating and encrypting data, and providing all necessary
control of the PHY.
Convergence Sublayer (Mapping of Ethernet Packets) The Convergence Sublayer (CS) is
the interface through which WiMAX MAC provides its services to higher-layer networking
protocols. The standard currently defines two distinct types of CS, one referred to as
ATM CS, designed for ATM packets, and another referred to as Packet CS, designed for
packet-based protocols such as IP, PPP, and Ethernet.
WiMAX 471
One of the key functions of CS is classification of packets, which is the process
of mapping higher PDUs to a particular connection for transmission. The mapping
process creates an association between the PDU and a particular connection. The association
with a connection enables the lower layer MAC entity to deliver the packet
to its destination with the QoS criteria as specified by the service flow characteristic
of the connection.
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