1 BASICS OF MOBILE COMMUNICATION


What is the main idea behind the cellular concept of mobile communication?

The main idea behind the cellular concept of mobile communication is to structure the mobile telephone network using many low-powered transmitters placed throughout a coverage area instead of using one very powerful transmitter located at the highest spot in an area.

What is a cell in a cellular system?

A cell in a cellular system is the basic geographic unit of the system and refers to the covering area of one transmitter or a small collection of transmitters.

What are the two main conditions that a cellular system must verify?

The two main conditions that a cellular system must verify are:

The power level of a transmitter within a single cell must be limited in order to reduce interference with the transmitters of neighboring cells.

Neighboring cells cannot share the same channels. In order to reduce interference, the frequencies must be reused only within a certain pattern.

What are the different types of cells used in a cellular system?

The different types of cells used in a cellular system are: Macro cells, Micro cells, Pico cells, Selective cells, and Umbrella cells.

What is frequency reuse in a digital cellular system?

Frequency reuse in a digital cellular system is the use of each frequency simultaneously by multiple base-mobile pairs in order to increase the subscriber density per MHz of spectrum.

What is cell sectoring and why is it important in reducing the level of interference?

Cell sectoring is a way of reducing the level of interference by using directional antenna at base stations, with each antenna illuminating a sector of the cell and with a separate channel set allocated to each sector. This reduces the number of prime interference sources.

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