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It was mentioned earlier that one of the reasons cellular systems are split into cells is so that the radio spectrum could be reused. Now is the time to discuss this concept in more detail. When a signal is transmitted, it gets weaker the further it moves away from the transmitter in exactly the same manner that a noise gets quieter the further away you move from the source of the noise. Eventually, the signal becomes so weak that it is impossible to detect it at all. If you then go the same distance again away from the first transmitter and another transmitter is installed at this point, it can use the same frequency as the first transmitter because they are so far apart that they do not interfere with each other.

The discussion in this part is heavily based on the GSM system, probably the system with the most advanced and well-planned mobility features to date. Current thinking is that the next generation cellular systems will adopt a near-identical means of coping with mobility to GSM. This part is structured as follows. Chapter 4 looks at how the network keeps track of where the users are, a prerequisite to making calls to the users. Chapter 5 looks at how, once a user has been located, a call can T 49 50 Understanding Cellular Radio actually be placed through to the user.

However, you do know that perhaps one in every five will do their shopping on a Friday night. Only a few of those in the supermarket at any time are actually queuing at the checkout. You might go to a neighboring town of similar size and count the number of people going into the supermarket every minute on Friday night. The checkouts need to be able to handle this many people per minute otherwise queues will develop. If you count an average of 10 people going in per minute and time the average person to take 2 minutes at the checkout, then you need 20 minutes of checkout time for every minute of real time, or 20 checkouts.

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