The following technologies were used in 1G or First generation of Wireless Telecommunication Technology:
Advance Mobile Phone Service (AMPS), Nordic Mobile Telephone (NMT), Total Access Communication System (TACS).C-NETZ, Radio Telephone Mobile
The following technologies were used in 1G or First generation of Wireless Telecommunication Technology:
Advance Mobile Phone Service (AMPS), Nordic Mobile Telephone (NMT), Total Access Communication System (TACS).C-NETZ, Radio Telephone Mobile System (RTMS),Nippon Telephone and Telegraph (NTT) and later NTACS (Narrowband Total Access Communications System) and JTACS (Japanese Total Access Communication System)
Advance Mobile Phone Service (AMPS) The limitations in Improved Telephone System and increase in number of telephony user led to the advent of new concept known as Advance Mobile Phone System.Cellular radio technology was used in Advance Mobile Phone System. This technology would accommodate maximum users with high quality of mobile service. Advanced Mobile Phone System was allocated with a spectrum bandwidth of 40 MHz, it worked on the principles of seven reuse pattern with cell splitting and sectoring. Cell Splitting and sectoring were used to increase the cell capacity. All cells were connected to each other and to the Mobile Telephone Switching Office by optical fiber. In this system calls were not connected directly, the calls were transmitted to cell center and Mobile Telephone Switching Office. Single channel consist of two frequencies. Transmissions were done using forward channel (channel used for base to mobile transmission) and reverse channel(channel used for mobile to base transmission) were forward channel was allocated frequency ranging from 869 – 894 MHz and reverse channel was allocated frequency ranging from 824 – 849 MHz. Here users were not connected directly, whenever the user dials a telephone number from the mobile unit (mobile unit contains an antenna and transceiver), a send button should be pressed then the phone starts searching the channels for a strongest signals and the call is transmitted to cell site, cell site establishes a connection between the user and Mobile Telephone Switching Office (MTSO). MTSO processes the call and the call is setup between the users.While the call in still in process the Mobile Telephone Switching Office monitors the signal strength and if a greater signal strength in found in adjacent c