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3G Interview Questions and Answers

What is 3G?

Definition: 3G, known as 3rd Generation, is a standard for mobile / cellular phones. It provides the services that fulfill the International Telecommunication Union specifications.

The application services of 3G include wireless voice telephone, mobile internet access, video calls and mobile television – all in a mobile environment.

3G allows simultaneous use of speech and data services
3G provides peak data rates of at least 200 KBits according to the IMT-2000 specification.
Mobile broadband access of several MBits to laptop computer systems, smart phones is provided by latest 3.5G, 3.75G versions.

3G standards:


  • Universal Mobile Telecommunications System – One of the 3G mobile telecommunications technologies, also being developed into a 4G technology.
  • Most common form of UMTS uses W-CDMA as an underlying air interface.
  • UMTS also covers Radio Access Network – UMTS Terrestrial Radio Access Network (UTRAN), and Mobile Application Part (MAP).
  • Users are authenticated via USIM cards (Universal Subscriber Identity Module).


  • Also known as IMT Multi-Carrier (IMT-MC), uses CDMA channel access for sending voice, data and signaling data between mobile phones and cell sites.
  • The standards are CDMA2000 IX, CDMA2000 EV-DOR Rev.0, CDMA2000 EV-DO Rev.A and CDMA2000 EV-Rev.B. They are approved radio interfaces for the ITU’s IMT-2000.
What is International Telecommunication Union?

The International Telecommunication Union is the eldest organization in the UN family still in existence. It was founded as the International Telegraph Union in Paris on 17 May 1865 and is today the leading United Nations agency for information and communication technology issues, and the global focal point for governments and the private sector in developing networks and services.

What are the advantages and disadvantages of 3G?

Advantages of 3G:

  • Overcrowding is relieved in existing systems with radio spectrum
  • Bandwidth, security and reliability are more
  • Provides interoperability among service providers
  • Availability of fixed and variable rates
  • Support to devices with backward compatibility with existing networks
  • Always online devices – 3G uses IP connectivity which is packet based
  • Rich multi media services are available

Disadvantages of 3G:

  • The cost of cellular infrastructure , upgrading base stations is very high
  • Needs different handsets.
  • Roaming and data/voice work together has not yet been implemented
  • Power consumption is high
  • Requires closer base stations and are expensive
  • Spectrum-license costs, network deployment costs and handset subsidies subscribers are tremendous.
What is Universal Mobile Telecommunications System?

Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile telecommunications technologies, which is also being developed into a 4G technology. The first deployment of the UMTS is the release99 (R99) architecture. It is specified by 3GPP and is part of the global ITU IMT-2000 standard.

What is 2G?

2G (or 2-G) is short for second-generation wireless telephone technology. Second generation 2G cellular telecom networks were commercially launched on the GSM standard in Finland in 1991. Three primary benefits of 2G networks over their predecessors were that phone conversations were digitally encrypted, 2G systems were significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with SMS text messages.

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