ResearchNewsletter - Archive Server
ResearchNewsletter - Archive Server
ResearchNewsletter - Archive Server
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Research Newsletter<br />
INTRODUCTION<br />
ESAM Code: Volume II Newsletters<br />
1989-15<br />
0004614<br />
PARTI<br />
CELLULAR RADIO—ITS HISTORY AND PRINCIPLES<br />
Cellular radio has been operating for just seven years in Europe and in that time has<br />
experienced tremendous growth which at present shows no sign of slowing down. This<br />
newsletter is the first in a series of three newsletters about cellular radio. These<br />
newsletters are entitled:<br />
• Part I: Cellular Radio—Its History and Principles<br />
• Part II: Cellular Radio in Europe—Growing into the Future<br />
• Part III: Digital Cellular Radio—The Market Forces<br />
This newsletter reviews the history and principles of this communication medium.<br />
The second newsletter reviews the current European market and its short-term prospects,<br />
while the third newsletter takes a longer-term view and discusses the prospects for the<br />
pan-European digital cellular network.<br />
PRINCIPLES OF CELLULAR RADIO<br />
Although the main idea for a "cellular" radio system originated in the Bell Telephone<br />
Laboratories in 1947, it was not until the early 1980s that technology made the first<br />
systems practicable. The main advantage of a cellular system over conventional mobile<br />
radio systems is its ability to handle a wider range of traffic loading through a more<br />
efficient reuse of available frequency spectrum. Ultimately cellular systems cater for<br />
considerably more customers than the earlier, traditional mobile radio systems.<br />
Cell Structure<br />
The area required to be covered is split into a number of smaller areas (cells). Each<br />
cell is equipped with its own radio base station. The cells are arranged together into<br />
clusters, the available number of radio channels being allocated to the clusters in a<br />
regular pattern that repeats over the entire coverage area. This technique enables radio<br />
channels to be reused several times throughout the coverage area.<br />
The number of cells in a cluster has to be chosen such that the clusters fit together<br />
into a continuous area. Only certain configurations do this. Typical cluster arrangements<br />
are based on 4, 7, 12, or 21 cells (see Figure 1).<br />
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