Download PDF by Paul Bedell: Wireless Crash Course, Second Edition

By Paul Bedell

ISBN-10: 007145280X

ISBN-13: 9780071452809

ISBN-10: 0071589023

ISBN-13: 9780071589024

This acclaimed instant intro ebook offers an intensive knowing the elemental workings of instant networks, know-how, and rules, sincerely explaining recommendations like radio frequency, phone websites and switching, in addition to the regulatory methods that have an effect on all instant carrier services and kit brands. This new version has been seriously revised to hide electronic instant: GPRS, 3G, UTMS, cdma2000, wireless, WiMAX, and the host of recent electronic prone riding instant progress.

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Example text

The D/R ratio is a critical cellular design principle and a core element of cellular system development. The overall geographic coverage size of cell base stations throughout a system determines the actual D/R ratio, along with the radio power level transmitted from cell base stations transmitting the Chapter 2 16 2 1 3 5 4 6 7 2 Distance 1 3 5 4 6 7 Figure 2-2 The size of the cell base station’s coverage area and radio power level transmitted from cell base stations transmitting the same set of (N 5 7) frequencies dictates the D/R ratio in a wireless system.

Without call-handoff, frequency reuse would not be technically feasible, and vice versa. The rationale behind the handoff process is the need to keep the subscriber unit receiving a usable signal. The wireless switch (the MSC) tracks the radio power levels of all wireless phone calls. When the system sees a mobile’s signal level going down, it seeks a neighboring cell base station that can hear the subscriber better via a stronger received signal level from these neighboring cells. When a call-handoff is required, the switch knows which surrounding site is the best candidate to receive the call-handoff.

Today base station antennas are even mounted on bridge overpasses on interstate highways. They are usually painted to blend into the color of the bridge itself. Some wireless carriers have even mounted their antennas on the top of grain elevators. When referring to cell site locations in this manner, we are actually referring to places where the carrier’s antennas may be mounted. Regardless of where the antennas are The Cell Base Station Figure 3-6 Sites for new cell base stations are determined using the search ring concept.

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Wireless Crash Course, Second Edition by Paul Bedell

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