What is 3G ?___________________________________________________________________________________
3G (or 3-G ) is short for third-generation technology . It is used in the context of mobile phone standards. The services associated with 3G provide the ability to transfer simultaneously both voice data (a telephone call) and non-voice data (such as downloading information , exchanging email , and instant messaging ).
3G or 3rd generation mobile telecommunications is a generation of standards for mobile phones and mobile telecommunication services fulfilling the International Mobile Telecommunications-2000 (IMT-2000) specifications by the International Telecommunication Union.Application services include wide-area wireless voice telephone, mobile Internet access, video calls and mobile TV, all in a mobile environment.
Several telecommunications companies market wireless mobile Internet services as 3G, indicating that the advertised service is provided over a 3G wireless network. Services advertised as 3G are required to meet IMT-2000 technical standards, including standards for reliability and speed (data transfer rates). To meet the IMT-2000 standards, a system is required to provide peak data rates of at least 200 kbit/s (about 0.2 Mbit/s). However, many services advertised as 3G provide higher speed than the minimum technical requirements for a 3G service. Recent 3G releases, often denoted 3.5Gand 3.75G, also provide mobile broadband access of several Mbit/s to smart phones and mobile modems in laptop computers.
How 3G services work?
3G technology services is the latest in mobile communication services. 3G here is a term that denotes "third generation". The 3G service is the third innovation, the analog cellular technology generation is the first generation innovation, digital mobile is the second generation,
The 3G mobile service is the best technology for the true multimedia cell phone that are typically known as smart phones. These phones feature an increased bandwidth and wonderful transfer rates. The phone is also able to play various web-based applications and the various audio and video files designed to be played on a phone.
The 3G services comprise of several cellular access technologies. The three most common cellular technologies are the CDMA2000, which is based on 2G Code Division Multiple Access, the WCDMA or the Wideband Code Division Multiple Access and the TD-SCDMA – the Time-division Synchronous Code-division Multiple Access
The 3G service networks have an amazing data transfer speed. In fact it can transfer data for up to 3 Mbps that means that it would take almost 15 seconds to download a 3-minute long MP3 song. In comparison, the fastest 2G phones can only achieve up to 144Kbps which means that using them it would take about 8 minutes to download a 3-minute long Mp3 song.
The 3G service has high data rates that are ideal for downloading any type of information from the Internet. The data rate is amazing to send and receive a large multimedia file. The 3G service enabled phones are like the mini-laptops and they can actually accommodate various complex broadband applications like the video conferencing application, web streaming video applications, sending and receiving faxes and instantly downloading e-mail messages with attachments.
The fact is that the 3G service has truly changed the way telecommunication is done in today’s world.
The 3G mobile service is the best technology for the true multimedia cell phone that are typically known as smart phones. These phones feature an increased bandwidth and wonderful transfer rates. The phone is also able to play various web-based applications and the various audio and video files designed to be played on a phone.
The 3G services comprise of several cellular access technologies. The three most common cellular technologies are the CDMA2000, which is based on 2G Code Division Multiple Access, the WCDMA or the Wideband Code Division Multiple Access and the TD-SCDMA – the Time-division Synchronous Code-division Multiple Access
The 3G service networks have an amazing data transfer speed. In fact it can transfer data for up to 3 Mbps that means that it would take almost 15 seconds to download a 3-minute long MP3 song. In comparison, the fastest 2G phones can only achieve up to 144Kbps which means that using them it would take about 8 minutes to download a 3-minute long Mp3 song.
The 3G service has high data rates that are ideal for downloading any type of information from the Internet. The data rate is amazing to send and receive a large multimedia file. The 3G service enabled phones are like the mini-laptops and they can actually accommodate various complex broadband applications like the video conferencing application, web streaming video applications, sending and receiving faxes and instantly downloading e-mail messages with attachments.
The fact is that the 3G service has truly changed the way telecommunication is done in today’s world.
Features
Data rates
ITU has not provided a clear definition of the data rate users can expect from 3G equipment or providers. Thus users sold 3G service may not be able to point to a standard and say that the rates it specifies are not being met. While stating in commentary that "it is expected that IMT-2000 will provide higher transmission rates: a minimum data rate of 2 Mbit/s for stationary or walking users, and 384 kbit/s in a moving vehicle," the ITU does not actually clearly specify minimum or average rates or what modes of the interfaces qualify as 3G, so various rates are sold as 3G intended to meet customers’ expectations of broadband data.
Security
3G networks offer greater security than their 2G predecessors. By allowing the UE (User Equipment) to authenticate the network it is attaching to, the user can be sure the network is the intended one and not an impersonator. 3G networks use the KASUMI block crypto instead of the older A5/1 stream cipher. However, a number of serious weaknesses in the KASUMI cipher have been identified.
In addition to the 3G network infrastructure security, end-to-end security is offered when application frameworks such as IMS are accessed, although this is not strictly a 3G property.
Applications of 3G
The bandwidth and location information available to 3G devices gives rise to applications not previously available to mobile phone users. Some of the applications are:
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