March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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that may have a radius of up to 35 km, whereas urban cells, where usage is much higher and signals
will not propagate as far, tend to be much smaller and may have a radius of 1 km or less. Some
picocells may only have a very small coverage area, and it would be possible to locate a mobile
accurately if one of these was used.
Moreover, many cells are sectored, and this will further narrow the area in which the mobile is
located. A sectored cell uses a number of antennas to split the cell; three are often used, provi ding a
coverage of 120
.
While Cell ID is limited in its accuracy, it has the advantage that it is possible to locate any cell
phone, however old, once it is registered onto the network.
TDOA
Time Difference of Arrival (TDoA) is another
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