TDMA and FDMA require some form of centralized control to mediate channel access.
What do you mean by centralized control?
One component is identified as the controller in a centralized control paradigm and is in charge of overseeing the operation of other components. Depending on whether the controlled components operate sequentially or concurrently, there are two types of centralized control models.
With centralized control, an organization, or at least its top levels, can regulate the actions of lower-level workers to ensure that they are in line with its objectives.
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