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Dataqyest<br />

I acomiKinyof<br />

I ThcDun&BradsticctCcMporation<br />

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 />

© 1989 Dataquest Incorporated July—Reproduction Prohibited<br />

77K comem of this report represenls our imerpreuttion and analysis c^infirmatkm generally amilabk lo the public or released by responsible individuals m the subject companies, but<br />

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may be clients of this and/or other Dataquest services. This irfiirmation is not furnished in connection with a sak or o^r to sell securUies or in connectum with the sohatatwn of an<br />

c^r to buy securities. This film and its parent and/or their c^icers, stockholders, or members of their Jiimilies may, from rime to time, have a Img or short position in the securities<br />

mentioned and may sell or buy such securities.<br />

Dataquest Incorporated, 1290 Ridder Park Drive, San Jose, CA 95131-2398 / (408) 437-8000 / Telex 171973 / Fax (408) 437-0292

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