GSM Overview Quiz

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Questions and Answers

What was the main purpose of developing the Global System for Mobile communications (GSM)?

To enable the efficient reuse of frequencies

To create a common European mobile telephone standard (correct)

To design a system compatible with ISDN services

To develop a digital cellular communications system

How is the size of a cell in a cellular system determined?

By the number of transmitters in the cell

By the transmitter's power (correct)

By the location of the cell

By the frequency band allocated

Why is the use of low power transmitters important in cellular systems?

To decrease the number of cells needed

To enable efficient reuse of frequencies (correct)

To improve signal quality

To increase the range of each transmitter

What happens if the transmitters used in cellular systems are very powerful?

Frequencies cannot be reused for long distances Signup and view all the answers

What is the distribution of the frequency band allocated to a cellular mobile radio system?

Distributed over a group of cells and repeated in all covering areas of an operator Signup and view all the answers

What is the concept behind cellular systems?

Use of low power transmitters for efficient frequency reuse Signup and view all the answers

What is the main purpose of reusing frequencies in a cellular system?

To increase the number of available channels per cell Signup and view all the answers

Why must the distance between cells using the same frequency be sufficient to avoid interference?

To prevent damage to the cellular system Signup and view all the answers

What is the function of the receiver filters in a cellular system?

To improve the performance of transmitter filters Signup and view all the answers

Why is the number of cells in a cluster very important in a cellular network?

To increase the capacity of each cell Signup and view all the answers

What is the primary advantage of using micro cells in densely populated areas?

Reduced possibility of interference between neighboring cells Signup and view all the answers

What is the purpose of selective cells in a cellular network?

To define cells with a full coverage of 360 degrees Signup and view all the answers

How does the size of the cluster impact interference between neighboring clusters?

Smaller clusters reduce interference due to increased channel capacity Signup and view all the answers

What is the characteristic feature of macro cells in a cellular network?

They cover remote and sparsely populated areas Signup and view all the answers

What impact does reducing the power level of transmitters have on densely populated areas?

It increases possibility of interference with neighboring cells Signup and view all the answers

How does reserving a distance between transmitters help in reducing interference?

By preventing damage to neighboring cells' receivers Signup and view all the answers

Study Notes

Cellular Systems

The main purpose of developing the Global System for Mobile communications (GSM) was to provide a standardized mobile communication system.

Cell Size and Determination

The size of a cell in a cellular system is determined by the power of the transmitter and the sensitivity of the receiver.

Low Power Transmitters

The use of low power transmitters is important in cellular systems to reduce interference and increase the capacity of the system.
Low power transmitters help to reduce the area of coverage, which in turn reduces the number of users that can interfere with each other.

Powerful Transmitters

If the transmitters used in cellular systems are very powerful, they can cause interference over a large area, reducing the system's capacity.

Frequency Band Allocation

The frequency band allocated to a cellular mobile radio system is distributed among multiple cells, with each cell using a specific frequency band.

Cellular System Concept

The concept behind cellular systems is to divide a geographic area into smaller cells, each served by a low-power transmitter, to provide mobile communication services.

Frequency Reuse

The main purpose of reusing frequencies in a cellular system is to increase the capacity of the system by allowing multiple cells to use the same frequency band.
The distance between cells using the same frequency must be sufficient to avoid interference.

Receiver Filters

The function of the receiver filters in a cellular system is to filter out signals from other cells and allow only the signal from the serving cell to pass through.

Cell Clustering

The number of cells in a cluster is very important in a cellular network because it determines the frequency reuse pattern and affects the system's capacity.
The size of the cluster impacts interference between neighboring clusters, with smaller clusters reducing interference.

Micro Cells

The primary advantage of using micro cells in densely populated areas is that they provide more capacity and better coverage in areas with high user density.
Micro cells are used to provide coverage in areas with high user density, such as shopping centers or stadiums.

Selective Cells

The purpose of selective cells in a cellular network is to provide additional coverage and capacity in areas with high user density.

Interference Reduction

Reducing the power level of transmitters in densely populated areas helps to reduce interference and increase the system's capacity.
Reserving a distance between transmitters helps to reduce interference by reducing the overlap of signals from neighboring cells.

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Description

Test your knowledge about the Global System for Mobile communications and its overview. Learn about the development of GSM as a common European mobile telephone standard and its compatibility with ISDN services.