Kindly explain and differentiate between the various internet generations.
1G systems These are the analog systems such as AMPS that grew rapidly in the 1980s and are still available today. Many metropolitan areas have a mix of 1G and 2G systems, as well as emerging 3G systems. The systems use frequency division multiplexing to divide the bandwidth into specific frequencies that are assigned to individual calls.
2G systems These second-generation systems are digital, and use either TDMA (Time Division Multiple Access) or CDMA (Code Division Multiple Access) access methods. The European GSM (Global System for Mobile communications) is a 2G digital system with its own TDMA access methods. The 2G digital services began appearing in the late 1980s, providing expanded capacity and unique services such as caller ID, call forwarding, and short messaging. A critical feature was seamless roaming, which lets subscribers move across provider boundaries.
3G systems 3G has become an umbrella term to describe cellular data communications with a target data rate of 2 Mbits/sec. The ITU originally attempted to define 3G in its IMT-2000 (International Mobile Communications-2000) specification, which specified global wireless frequency ranges, data rates, and availability dates. However, a global standard was difficult to implement due to different frequency allocations around the world and conflicting input. So, three operating modes were specified. According to Nokia, a 3G device will be a personal, mobile, multimedia communications device that supports speech, color pictures, and video, and various kinds of information content. Nokia's Web site (http://www.Nokia.com) provides interesting information about 3G systems. There is some doubt that 3G systems will ever be able to deliver the bandwidth to support these features because bandwidth is shared. However, 3G systems will certainly support more phone calls per cell.
4G Systems On the horizon are 4G systems that may become available even before 3G matures (3G is a confusing mix of standards). While 3G is important in boosting the number of wireless calls, 4G will offer true high-speed data services. 4G data rates will be in the 2-Mbit/sec to 156-Mbit/sec range, and possibly higher. 4G will also fully support IP. High data rates are due to advances in signal processors, new modulation techniques, and smart antennas that can focus signals directly at users. OFDM (orthogonal frequency division multiplexing) is one scheme that can provide very high wireless data rates. OFDM is described under its own heading.
1G, 2G, 3G, 4G
basically more th G number is bigger faster you will get internet and enjoy online multimedia with less latency possible, remaining are technologies hardware and software.
The first generation of cellular systems 1G (14.4kbps data) based on a system of analogue mobile communications (send waves for voice, no data, no internet) primarily using the following standards:
-AMPS (Advanced Mobile Phone System), used in USA
-NMT (Nordic Mobile Telephone)
-TACS (Total Access Communications System), based on AMPS used in UK
The second generation (2G) developed in the late 1980s use digital technology for connection and for the speech signal (dial-up data calls digitally).
2G essentially uses the following standards:
- GSM (2G)
- GPRS (2.5G), intermediary between 2G and 3G (up to about 144kbit/s) instead of circuit data (2G) use packet data, WAP, MMS and SMS
- EDGE (Enhanced Data Rates for GSM Evolution, 2.75G)
The 3G mobile systems (digital broadband exclusively packet data, peak to 3.1Mbp/s usually 500-700kbp/s) certified by the ITU IMT-2000 allows for faster communications services, Internet anywhere and anytime (data rates of 384kbit/s and more), video conferencing.
The third generation cellular systems (3G) uses the following standards:
- UMTS (Universal Mobile Telecommunications System), CDMA2000, EDGE...
The 3.5G faster 2Mb/s, HSPA (High Speed Packet Access), shorter Transmission Time Interval (TTI), to improve the downlink by introducing HSDPA. Data transmission 8_10 Mb/s and 20 Mb/s for some systems, improved downlink significantly reduced latency.
The 3.75G HSPUA (High Speed Uplink Packet Access), speed 1.4Mb/s to 5.8Mb/s and real time person to person gaming.
The 4G Data transmission (broadband anywhere and anytime, ALL IP, Very high Throughput, 100Mb/s to Gb/s) is much Higer than 3G, download is 100Mb/s, television with high speed and clarity uses include the following standards:
- WIMAX (Worldwide Interoperability for Microwave Access)
With 4G benefit from speeds up to 100Mb/s for downloads against 42MB/s for 3G + and a speed of 1Gb/s in a fixed position: it is equivalent to an internet connection by optical fiber.
1G => Voice
2G => Voice + Data
3G => Voice + Data + Video (Broadband)
4G => Long Term Evolution aka LTE (Ultra-Broadband). Faster than 3G.
This is the answer. Along with speed goes up with each of them.
The main difference is in internet connectivity. 1G has none, 2G has a slow connection (comparable to dial-up), 3G is faster nad 4G is faster yet (though it means slightly different things in different parts of the world. You can read up on each of the standards in Wikipedia (e.g. http://en.wikipedia.org/wiki/1G for 1G, http://en.wikipedia.org/wiki/2G for 2G etc).
You can read a lot if you're interested (ie, http://en.wikipedia.org/wiki/4G) but all you really need to know is that these are different standards used for mobile data. The newest standard – 4G – is currently the fastest, but older standards are still in use around the world, particularly in rural areas.
Allegedly, the latest protocol updates in 4G will bring us download speeds close to 700 Mb/s by late 2013. [Wikipedia] That is, theoretically. Practical speeds will be much lower.
Yet, it never ceases to amaze me. WOW. :D
That's not hard.
Simple difference between them:
In 1G, Narrow band analogue wireless network is used, with this we can have the voice calls and can send text messages. These services are provided with circuit switching.
Then in case of 2G Narrow Band Wireless Digital Network is used. It brings more clarity to the conversation .Both the 1G and 2G deals with voice calls and has to utilize the maximum bandwidth.
In 3G Wide Brand Wireless Network is used with which the clarity increases and gives the perfection as like that of a real conversation. The data are sent through the technology called Packet Switching .Voice calls are interpreted through Circuit Switching.
Then with the case of Fourth Generation that is 4G in addition to that of the services of 3G some additional features such as Multi-Media Newspapers, also to watch T.V programs with the clarity as to that of an ordinary T.V. In addition, we can send Data much faster that that of the previous generations.
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