A system development method by Jackson M.A

By Jackson M.A

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The solution to this problem is to group a number of cells together and call them a location area. A location area might group, say, 10 cells together. Now instead of broadcasting the cell identity, the transmitter broadcasts a location area identity that will be the same for a number of adjacent cells. Mobiles only transmit messages to the transmitter telling it that they have changed area (so-called “location area update messages”) if they detect a different location identity code on moving to a new cell.

A mobile operator will typically set a higher blocking probability, perhaps around 2%. This figure is often known as the grade of service. What they then want to know is how the number of radio channels required changes with the amount of traffic generated. 6. 6 Channels versus Erlangs for a range of blocking probabilities. 34 Understanding Cellular Radio There are a number of things to note about this. The first, unsurprising, fact is that as the blocking probability gets lower and lower, more and more radio channels are required to handle the same amount of traffic.

You will see in later chapters how the capacity of the link can vary and what constitutes high- and lowcapacity systems. In order to understand these factors better, each of the interconnection systems is now explained in more detail. 1 Leased link A leased link refers to the leasing of a line from a national or regional telephone operator. The line may not actually be cable, the telephone operators may themselves be using satellite or microwave links, but this will not be apparent to the wireless operator who pays an annual fee for 2.

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