32 Questions
How is the size of a cell in a cellular system determined?
By the transmitter's power
What was the primary purpose of developing GSM?
To create a common European mobile telephone standard
What is the concept behind cellular systems?
Efficient reuse of frequencies using low power transmitters
How are radio channels distributed in a cellular mobile radio system?
Distributed over a group of cells and repeated in all covering areas
What happens if transmitters used in cellular systems are very powerful?
Frequencies cannot be reused for long distances
Why was GSM rapidly accepted worldwide?
It was designed to be compatible with ISDN services
What is a key condition for the proper functioning of a cellular system?
Limiting the power level of transmitters in each cell
Why must the distance between cells using the same frequency be sufficient?
To avoid interference
What is the purpose of clustering cells into clusters?
To group cells for repeated continuous coverage
What is the significance of the number of cells in each cluster?
It directly affects the capacity of each cell
What is the main purpose of using micro cells in densely populated areas?
To reduce the interference with neighboring cells
Why are selective cells used in some cases?
To define a cell with a full coverage of 360 degrees
What does frequency reuse aim to achieve in a cellular system?
Reduce interference and increase capacity
Why must neighboring cells not share the same channels?
To reduce interference and increase capacity
What is a significant factor in determining the capacity of each cell?
The number of available channels per cell
Why are receiver filters important in maintaining communication links within the cellular network?
To reduce interference and increase capacity
In a cellular system, what does a cell correspond to?
The geographic area covered by a single transmitter or a small group of transmitters
What is the purpose of using low power transmitters in a cellular system?
To enable efficient reuse of frequencies
What is the significance of the distribution of the frequency band allocated to a cellular mobile radio system?
It allows for the reuse of radio channels in different cells
What is the primary factor in determining the size of a cell in a cellular system?
The power of the transmitter
Why are very powerful transmitters not used in cellular systems?
They limit the efficient reuse of frequencies
What is the concept behind the use of cells in a cellular system?
Efficiently reusing frequencies through small coverage areas
What is the primary purpose of clustering cells into clusters?
To reduce the interference between neighboring clusters
Why are micro cells used in densely populated areas?
To increase the number of available channels in each cell
What does frequency reuse aim to achieve in a cellular system?
To reduce the interference between neighboring cells
Why are receiver filters important in maintaining communication links within the cellular network?
To prevent interference from affecting signal quality
What is the significance of the number of cells in each cluster?
To increase the capacity of each cell
What must be verified for a cellular system to work properly?
The distance between cells using the same frequency must be minimized
Why are macro cells used in remote and sparsely populated areas?
To maintain a distance between transmitters in neighboring cells
What is the main purpose of using selective cells?
To cover specific directional areas
In what scenarios are micro cells used?
In densely populated areas
Why do neighboring cells need to avoid sharing the same channels?
To maintain communication links within the cellular network
Study Notes
Cellular System Basics
- A cellular system is a network of geographic cells, each served by a fixed location transceiver, known as a cell site or base station.
- The concept behind cellular systems is to provide a network of low-power transmitters to serve a specific geographic area, allowing for efficient use of frequencies.
Cell Size Determination
- The size of a cell in a cellular system is determined by the primary factor of the distance a signal can travel before becoming too weak.
- The power of the transmitter, terrain, and environment also play a role in determining the size of a cell.
Frequency Reuse
- Frequency reuse aims to achieve efficient use of frequencies by reusing frequencies in different cells, allowing for a large number of simultaneous conversations.
- Neighboring cells must not share the same channels to avoid interference.
Cell Distribution and Clustering
- Radio channels are distributed in a cellular mobile radio system by allocating a set of frequencies to a cluster of cells, which are then reused in different clusters.
- Clustering cells into clusters allows for efficient use of frequencies, and the number of cells in each cluster is significant in determining the capacity of the system.
- The purpose of clustering cells is to enable frequency reuse, increasing the capacity of the system.
Cell Types
- Macro cells are used in remote and sparsely populated areas, while micro cells are used in densely populated areas to increase capacity.
- Selective cells are used in some cases to provide additional coverage and capacity.
Importance of Transmitter Power
- Using low-power transmitters in a cellular system is important to prevent interference between cells and to allow for efficient use of frequencies.
- Very powerful transmitters are not used in cellular systems because they would cause interference and reduce the capacity of the system.
GSM Development
- GSM (Global System for Mobile Communications) was developed to provide a unified standard for mobile communication, allowing for roaming and international communication.
Key Conditions for Proper Functioning
- A key condition for the proper functioning of a cellular system is that the distance between cells using the same frequency must be sufficient to prevent interference.
- Receiver filters are important in maintaining communication links within the cellular network by filtering out unwanted signals.
- Verification of the system's design and implementation is crucial for a cellular system to work properly.
Test your knowledge about the Global System for Mobile communications with this quiz. Learn about the development, standards, and compatibility with ISDN services.
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