Physical Channels:
A physical channel is specified by a specific time slot in a specific channel
carrier frequency
logical channels:
run over a physical channel, but not necessarily in all its time slots
are classified into traffic channels and control channels
have to be managed: set up, maintenance, tear down
Control channels:
Control channels are interspersed with traffic channels in well-specified
ways (e.g. every 26 TDMA frames a logical channel gets bandwidth in a
physical channel)
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