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Question posted: 05 08 2011 07:03:20 +0000,
5 answers, 171 views, last activity
05 14 2011 16:18:14 +0000
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The 1G service was commonly based on a TDM voice infrastructure built around class x switches and 64 kbps slots. It had data, but circuit switched over a 64Kpbs voice bearer.
The 2G service had the same switched TDM backbone, but added a true Data Bearer and a digital voice bearer. Data rates were still limited to the max 64kbps of a single time slot.
The 2.5G added a packet bearer to the mix, still limited to 64kbps slots.
The 3G changed the backbone slightly to allow a full T1 or E1 or J1 to be consumed by a data sub-scriber, but is still based on an ISDN style backbone. Sure one has packet switched data, but its carried over a traditional TDM backbone. There is yet a circuit voice backbone and while the data rates are high enough for VoIP, the latency of the data service is to great to base all of the "bearer services" on it, so one still have circuit voice, circuit data and packet data bearers.
The 4G system intends to utilize a packet infrastructure rather than a traditional telephone architecture. Services will be horizontally layered on top of a proper low latency, QoS enabled packet switch (read IP) infrastructure. Gone will be the circuit voice and circuit data bearers.
So "G" has more to do with the infra-structure and less to do with the data rates. The data rates over the air are driven by the organization of the infrastructure and other than that have a little to do with what generation they are.
Thanks for the answers, JAYANTA & Srinivasji . It's a knowledge gain for me.
Thanks for referral, JAYANTA.
Thanks for the sharing Mr.Jayanta Kumar.
Thanks for sharing this Q :)
"G" for generation. It shows the technological development of the telecommunications. Since you cant call every technology with a nomenclature, its always better to call the new technology in generation terms in an ever growing technological area.
1G(1st generation) mobile networks systems were referred to as cellular ,which was later shortened to "cell" due to the method by which the signals were handed off between towers .Cell phone signals were based on analog system transmissions ,and 1G devices were comparatively less heavy and expensive than prior devices.Some of the most popular standards deployed for 1G systems were Advanced Mobile Phone System(AMPS ), Total Access Communication System(TACS), and Nordic Mobile Telephone(NMT).
2G(2nd generation) ...2G phones deploying GSM technology was introduced .GSM uses digital modulation to improve voice quality.The 2G services also began to offer additional services such as paging,faxes,text-messages and voice mail.
An intermediary phase 2.5G was also introduced which delivers packet-switched data capabilities to existing GSM networks. The EDGE network is an example of 2.5G.
3G( 3rd generation ) services allowed customers to use audio,graphics and video applications. 3G cellular services or UMTS supports both packet and circuit switched data transmission and a single set of standards can be used worldwide with compatibility over a variety of mobile devices. UMTS delivers the first possibility of global roaming with potential access to the internet from any location.
4G(4th generation) has been developed with the aim of providing transmission rates upto 20 mbps (as compared to 3G which can provide upto 2 mbps) while simultaneously accomodating Quality of Service(QoS) features . QoS will allow you and your telephone carrier to prioritize traffic according to the type of application using your bandwidth and adjust between your different telephone needs at a moment's notice.The deployment of 4G networks is expected to include high performance streaming of multimedia content and also improve video conferencing functionality.
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