3G Wireless Networks
Featuring many examples showing network architectures, internetworking, protocol use, and integration, this book supplies the answers you need for key networking decisions.
TABLE OF CONTENTS 3G Wireless Networks
13.4 Radio Elements
13.4 Radio Elements
Because CDMA2000 is a radio access platform, it leads to reason that the driving force for dimensioning the network to meet the customer demands is to ensure that the radio system is dimensioned accordingly. The radio elements that include the base radius, BTS, channel elements, and BSCs, directly influence the circuit switched and packet data network requirements.
There are a few key elements that are associated with the radio dimensioning for a CDMA2000 system whether it is any of the 1X variants or even a 3X system. The key elements for the dimensioning are
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Spectrum
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Channel assignment scheme
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Site configuration (antennas)
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Channel elements
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Link budget
The spectrum requirements for a CDMA2000-1X or 3X network are, of course, directly dependant upon the amount of channels required to be deployed to meet the current or expected demand. In addition, the channel assignment scheme that is utilized will have a direct impact on the possible inclusion of 3X in the future as well as optimal spectrum management of the existing system when using CDMA2000-1x only.
13.4.1 Antenna Configurations
The site configurations for the CDMA2000 sites can and do take advantage of many of the IS-95 lessons learned through the deployment phases. Taking a simplistic view of CDMA2000 antenna requirements, a total of two receive antennas (or paths) are needed per sector, as was the case with IS95 systems. The diagram shown in Figure 13-1 illustrates the requirement for a single CDMA2000-1X Tx channel and that...
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