Principles of Radio Cellular
                     Principles of Radio 
Cellular
Introduction
• Radio cellular network is set up by assigning a pair of channels 
to a particular user or a phone. A channel is usually defined by 
its bandwidth and frequency, which is the basis of all analog 
cellular networks.
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Frequency re-use
• Frequencies assigned to the service are re-used in a symmetric 
pattern of areas called ‘cells’, where each cell covers a base 
station. For radio networks, these cells are rhombohedra in 
shape.
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Technology
• Radio cellular involves the combination of sophisticated 
technology like high frequency semiconductors, radio 
transmission planning and global telecommunication network.
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Radiotelephone
• A radiotelephone is a phone without wires, which works 
through the radio medium. It requires a portable source of 
power, a base station and a mobile station. A radio antenna 
facilitates the transmission of radio network.
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How it works?
• Two radio channels assigned to a user for speaking and 
listening at the same time. One of them is a forward channel, 
which refers to base to mobile path, the other channel being 
reverse channel is mobile to base path.
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How it works?
• Each mobile has its own telephone number built into the radio 
or is a part of internal memory. Subscribers can roam over 
cellular networks if there is an agreement with local base 
station.
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How it works?
• Mobiles are also equipped with receiver, transmitter and 
tuning circuits which is powered by the battery. Base station 
and mobile station connect automatically with help of several 
protocols.
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How is it different from Fixed 
Telephone Network?
• Radio cellular network has considerable advantages such as no 
fixed wire to the local exchange, more clarity and the 
advantage of being portable, users can carry it around with 
them for the convenience.
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Advantages
• Users switch frequencies as they move from one location to 
other. It can be used in areas where cables cannot be laid, as 
radio cellular is wireless. It also has a higher capacity of 
subscribers per cell.
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