Page 15 - Integrated Wireless Propagation Models

Preface

ver since I created the macrocell prediction model in 1977 at Bell Labs, many
people wanted to know the details of the model. AT&T had held it as proprietary
Eand did not disclose it. Afterward, I created the microcell model in 1988. Both
models are briefly described in my previous books, but the whole models were not fully
disclosed at that time because of Pactel's proprietary interest. In 1991, David Lee worked
for me at Pactel (the company was renamed AirTouch in 1994), making many field
measurements in the different countries of Pactel's markets for deploying the desired
cellular systems. In the meantime, the merit of these two models as a tool in deploying
the systems in those countries has been shown. Starting in 1995, the two of us had
worked on the in-building (picocell) model, which used mostly empirical data. In 2008,
David asked me if I wanted to write a book on the Lee model. He would do all the
preparation work for the book. From his hard work collecting all the necessary material,
this book resulted.
Chapter 1 introduces all the terms and describes the natural phenomena in the
mobile communications environment. Chapter 2 introduces the macrocell models that
have been created by others. They are the most popular area-to-area models used in the
industry. Chapter 3 introduces the point-to-point prediction models in the macrocell
models. There are two models. The Lee model is for short distances ( <1 0 miles), and the
Longly-Rice model is for long distances (> 10 miles). Chapter 4 introduces the microcell
models. The Lee microcell model is introduced in the first part of the chapter. The near­
in distance used in microcell prediction is clearly defined based on the equations
derived in my earlier published books. A lot of empirical data collected from different
areas, in both domestic and foreign markets, were used to verify the Lee model.
Chapter 5 introduces the Lee in-building model for both picocell and femtocell. The
newly defined close-in distance for the indoor environment is derived. Many earlier
papers regarding the Lee in-building model published by David and me have been
modified in this book, such as in the case of "same floor" and especially in the case of
"interfloor," shown in Sec. 5.5.3. In Chap. 6, the integration of the three Lee models is
described. David has made a software tool to plot a prediction signal strength chart
covering the three different Lee models.
In this book, many other prediction models are included with their merits for
readers to understand besides the Lee models. Also, the integration of the three Lee
models-macrocell, microcell, and in-building (picocell and femtocell)-is displayed
and used for future planning of an overall cellular system in a specific area. Users
should understand that a good prediction model can be accepted if its standard

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