Briefly discuss about cellular systems. give their advantages and disadvantages
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A cellular network or mobile network is a communication network where the last link is wireless. The network is distributed over land areas called cells, each served by at least one fixed-location transceiver, but more normally three cell sites or base transceiver stations
ADVANTAGES
1. Higher capacity
Smaller the size of the cell more the number of concurrent users i.e. huge cells do not allow for more concurrent users.
2. Less transmission power
Huge cells require a greater transmission power than small cells.
3. Local interference only
For huge cells there are a number of interfering signals, while for small cells there is limited interference only.
4. Robustness
As cellular systems are decentralized, they are more robust against the failure of single components.
DISADVANTAGES
1. Infrastructure needed
Small cells require a complex infrastructure to connect all base station. The infrastructure required includes switches for call forwarding, location registers etc.
2. Handover needed
The mobile station has to perform a handover when changing from one cell to another very frequently.
3. Frequency planning
To avoid interference, frequency spectrum should be distributed properly with a very less range of frequency spectrum.
ADVANTAGES
1. Higher capacity
Smaller the size of the cell more the number of concurrent users i.e. huge cells do not allow for more concurrent users.
2. Less transmission power
Huge cells require a greater transmission power than small cells.
3. Local interference only
For huge cells there are a number of interfering signals, while for small cells there is limited interference only.
4. Robustness
As cellular systems are decentralized, they are more robust against the failure of single components.
DISADVANTAGES
1. Infrastructure needed
Small cells require a complex infrastructure to connect all base station. The infrastructure required includes switches for call forwarding, location registers etc.
2. Handover needed
The mobile station has to perform a handover when changing from one cell to another very frequently.
3. Frequency planning
To avoid interference, frequency spectrum should be distributed properly with a very less range of frequency spectrum.
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