Cordless telephone technology that aimed at conferring people the luxury of communicating via their home telephones while enjoying the privilege of roaming around their place incited the cellular telephone technology. (Tanenbaum, 2000) Conventionally, a cordless telephone consisted of a base station and a handset. The base station is connected to the wired connection of the local telephone exchange or central office via a standard phone jack. The handset communicates with the base station by low-power radio operating within a range of 100 to 300 meters.
The sole aim kept in mind while manufacturing these cordless telephones was their usage within houses. This fact led to production that did not conform to any communication standards. Some models operated on a fixed frequency to communicate between the handset and base station while the bit refined ones offered customized setting of transmission frequency to avoid the interference of neighbouring handsets / base stations in the communication.
Anyhow, with the passage of time, analogue and digital standards were introduced to eliminate frequency interferences with televisions and radios. Later, this technology proved to be the blueprint for what we know today as cellular telephony.
Advance Mobile Phone System
As we delve deep into the intricacies of cellular telephony, we come across AMPS (Advanced Mobile Phone System), invented by Bell Labs and first installed in the United States in 1982. It is also used in England and there it is called TACS. Japanese call this technology MCS-L1. AMPS suggests division of a geographic region into cells of 10 to 20 km each using some set of frequencies. An AMPS system can have 5 to 10 calls on each frequency, in widely separated cells.
Finding locations high in the air to place base station antenna is a major issue...............
