The classification is done on the basis of matching criteria that is applied to each
packet from the higher layer protocol. The matching criterion includes matching based
on a protocol-specific packet header (e.g., IP header). If the packet matches the specific
matching criteria, then it is associated with the specific connection. If the packet fails
to match the classification criteria, then it is dropped. The exact rules and parameters
for mapping depend on the higher layer protocol.
The classification of Ethernet packet is based on one or more of the following
Ethernet header fields: Destination MAC Address, Source MAC Address, Ethertype/
SAP, 802.1D-Priority, 802.1Q-VLAN ID. The ability to classify packets based on these
fields facilitates delivery of Ethernet services over the WiMAX network.
Another important, though optional, function of CS is payload header suppression
by the transmitter and reconstruction by the receiver. This feature, which is inherited
from DOCSIS, allows for efficient utilization of the RF bandwidth for traffic with static
header information (e.g., Ethernet MAC address, VLAN, etc.). The detail of payload
header suppression is negotiated by the two sides of a connection.
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