What is meant by logical channel, and how is the concept useful? Explain.
What will be an ideal response?
In wireless systems, channels refer to the wireless communications paths
between wireless stations. They may be either physical or logical depending
on the application. An RF channel is a physical channel, whereas control and
traffic channels within the RF channel would be considered as logical
channels. For example, in TDMA, a physical channel is used in time multiplex
mode and a time-slot assigned to a user becomes a logical channel. Similar
arguments can be given about the use of code in a CDMA system. Logical
channels are used to carry user information and set up and control calls in the
cellular networks.
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