16-1 CELLULAR TELEPHONY Cellular telephony is designed to provide communications between two moving units,called mobile stations (MSs),or between one mobile unit and one stationary unit,often called a land unit. Topics discussed in this section: Frequency-Reuse Principle Transmitting Receiving Roaming First Generation Second Generation Third Generation 16.2 16.2 16-1 CELLULAR TELEPHONY Cellular telephony is designed to provide communications between two moving units, called mobile stations (MSs), or between one mobile unit and one stationary unit, often called a land unit. Frequency-Reuse Principle Transmitting Receiving Roaming First Generation Second Generation Third Generation Topics discussed in this section: