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[STDS-802-16] how to tell whether a MAC PDU is data or management message



I may have a stupid question.
When the MAC receives a packet, how does it tell whether this packet
is a MAC management message or it is a user-data and should be sent to
up-layers?
 
It may tell through the connection type, but how if the message is a broadcast message?
Do we need to set up a special bit in the MAC header to differentiate them?
 
Honghai Zhang
Lucent Technologies