History :
The first commercially automated cellular network was launched in Japan by Nippon telegraph and telephone in the year 1979, and initially in the metropolitan area of Tokyo. Japan became the first nationwide 1G network.
In the year 1981, The NMT system simultaneously launched in Denmark, Norway, and Sweden. NMT was the first mobile phone network to main feature international roaming. In the year of 1983, the first 1G network launched in the USA was Chicago based Ameritech using the Motorola DynaTAC mobile phone. It was used for voice services and was based on a technology called Advanced Mobile Phone System ( AMPS ).
Several countries then followed in the early to mid-year of - the 1980s including the UK Mexico and Canada. In the year 2018, only a limited NMT service in Russia remains the only 1G cellular network still in operation. It was continued until being replaced by 2G digital telecommunications, The antecedent to 1G technology is the mobile radiotelephone.
Basic Key Features of 1G technology :
- Speed - 2.4 kbps
- Frequency - 800 MHz and 900 MHz
- Modulations: Frequency modulation
- Mode of service - Voice only
- Allows the voice calls in 1 country
- Technology: Use Analog Signal
- Access techniques: Frequency division multiple access
Most popular 1G system during the 1980s:
- Advance mobile phone system
- Nordic mobile phone system
- Total access communication system
- European total access communication system
Advantages of a 1G network :
- Improve voice clarity
- The network uses the analog signal
- Reduce noise in the line
- Consume less battery power
Disadvantages of a 1G network :
- Poor voice quality
- Large phone size
- Poor battery life
- No security
- Limited capacity
- Poor hand-off reliability
- Very slow speed
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