Mobile Telephone Switching

Telephone > Mobile Telephone Switching

Generally, the region served by a Mobile Telephone System is divided into small Cells. This allows extensive Frequency Reuse across a certain Area, so that more Customers can use Mobile Telephones simultaneously. Uniform Hexagons are used to represent these Cells on the Map. Each Cell has a Base Station, which is located almost at the center of the Cell. All the Base Stations are connected to the Mobile Telephone Switching Office (MTSO).

A Mobile Telephone communicates generally with the nearest Base Station on a certain free Frequency Pair (one for Transmitting and the other for Receiving), which is automatically chosen among the Set of Pairs belonging to that specific Base Station.

As you move toward the edge of a Cell, the Base Station of the Cell will note that your Radio Signal Strength is diminishing. Meanwhile, the Base Station of the Cell you are moving toward will be able to see your Telephone's Signal Strength increasing. The two Base Stations coordinate themselves through the MTSO and, at some point, your Telephone gets an Instruction Signal telling it to change Cell and Frequency and switches to the Base Station of the new Cell. This switching process is called Handoff.

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Telephone > Mobile Telephone Switching