Wireless Systems

ALSO CALLED: Mobile Data, Digital Cellular Systems, Mobile Data Systems, Terrestrial Wireless Communications Systems, Wireless Data Systems, Analog Cellular Systems, Cellular Systems, Wireless Data Transmission Systems, Wireless Communications Systems, Public Land Mobile Networks
DEFINITION: A public land mobile network (PLMN) is any wireless communications system intended for use by terrestrial subscribers in vehicles or on foot. Such a system can stand alone, but often it is interconnected with a fixed system such as the public switched telephone network (PSTN). The most familiar example of a PLMN end user is a person with a cell phone. However, mobile and portable Internet use is also  … 
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WIRELESS SYSTEMS DEFINITION (continued): …  becoming common.The ideal PLMN provides mobile and portable users with a level of service comparable to that of subscribers in a fixed network. This can be a special challenge in regions where the terrain is irregular, where base station sites are hard to find and maintain, and in urban environments where there are numerous obstructions such as buildings, and myriad sources of radio-frequency (RF) radiation that can cause noise and interference. Most systems today use digital technology rather than the older analog methods. This transition has resulted in improved communications coverage and reliability, … 
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