Senin, 21 Juli 2008

3G and GSM technology

3G Handphone

by John BertoneFor the last few years there has been a lot of talk about 3G or Third Generation handphones.

Telecommunications and electronics manufacturing giants made the news as they battled to be the first in what was hoped would be a huge market for a new era of mobile communication, and then when 3G was actually set up, handphone companies tried to convince consumers to upgrade to the new services.

Despite all the talk, a lot of people still don’t know what 3G handphone really means. What follows is a brief guide to 3G handphone communication.

What is it?

3G handphone means that the new generation of handphones now have the capacity to hook up to wireless broadband services. The connection speed is 144 kbps and which is roughly three times the speed of a 56K dial up modem connection. Some services offer higher connection speeds.

With this enhanced connectivity you can now surf the Internet from a phone, enjoy streaming music video, watch on-demand video programming, download and play 3D games, and videoconference with your friends and colleagues.

Laptop users also can take advantage of 3G networks for mobile broadband without a Wi-Fi network; all you need is a carrier-supplied PC Card and a data plan.

What kinds of 3G networks exist?

There are two main varieties of 3G: UMTS (Universal Mobile Telephone Service), which uses W-CDMA (Wideband Code Division Multiple Access) as its underlying standard, and CDMA2000 1xEV-DO (Evolution-Data Optimised), which brings 3G speeds to CDMA networks.

Both W-CDMA and 1xEV-DO are already available in major cities in Australia with more expansion coming soon. Speeds for both should be about entry-level ADSL quality.

Which Companies provide 3G handphone services?

In Australia, The big four handphone networks / carriers all have 3G handphone services, but they each have different plans, services and coverage areas.

Presently the service of these carriers is not provided in all localities, and when a user goes outside the 3G supported areas, the phones fall back on the normal GSM/ GPRS system enabling users to reach approximately 95% of the handphone population.

Service plans from the major providers range from around $20 a month and up.

What Kinds of Phones Support 3G?

If you want to take advantage of 3G handphones you not only have to subscribe to a new service plan, but you need a new hand phone. Third-generation handsets offer video calls, music downloads and streaming services.

They're generally a bit bigger than their 2G predecessors but offer a whole lot more multimedia capacity. All the major manufacturers (Nokia, Sony Ericsson, Motorola, Sharp, NEC, Samsung) sell models with 3G handphone capacity.

Check with your service provider to find out which handsets are suitable for the plan that you wish to sign up for.

What’s coming next?

In the near future the connection speeds of 144kbps will be increased to 30-100 Mbps in the so-called 4G networks. These speeds will allow users to enjoy high-quality streaming video, high-quality videoconferencing and voice-over-IP mobile communication.

If you enjoy the services that you get on a broadband Internet connection and would like to have them in your pocket, then the time is right to take a close look at 3G handphones.

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GSM Handphone

by Nicola Kennedy

Prior to the end of the 20th century, the use of phones were limited to the home or workplace. Then technology gave us the pager, the beeper and then the handphones.

Everybody will agree that handphones are better than the other types of phones because aside from its being handy it also offers differing varieties of features. You can now view movies, listen to radio, and take memorable photos all with the handphone. Although millions of people use it, it is undeniable that not everyone knows about the technology needed for handphones to work.

One such technology is GSM, how many of us know the correct meaning of this acronym? How about its uses?

GSM stands for "Global System for Mobile Communications". This refers to a digital handphone technology that is primarily based on a specified standard for how data is sent over a wireless network. GSM was taken over in 1989 by the ETSI (European Telecommunications Standards Institute) and they finalized the GSM standard in 1990. GSM handphones use a combination of Time and Frequency Division Multiple Access.

How does GSM work? The GSM works very differently as you compare it to its analog precursor. It can provide you with important features like a fax machine, encryption, text messaging (this is the most commonly used among its services), call forwarding, caller ID, call waiting and multi party conferencing. This is useful because you can talk to the other line without any interference from other handphone calls. The reason for this is because, the frequency channel of GSM is divided into several time slots and as the data travels, there is a specified slot for it, away from the other data. Aside from this, there are also other important features that can be provided by the GSM.

There are several system components and basic services that handphone GSM system can provide to its users. To start with, the key types of GSM devices both include single mode and dual mode handphones, embedded radio modules and even external radio modems.

Since there is a need to distinguish between voice and data communication, GSM has found a way of resolving it. The GSM system has made a significant separation of the circuits between these two important elements - the circuit switch refers to the primary voice service and the packet switch refers to the primary data service.

The main companies that offer a credible GSM Handphone service of in the United States are the AT&T and the Cingular companies that already merged into one company now. The second is T-Mobile.

Nicola Kennedy publishes articles and reports and provides news, views and information about communications and GSM and Satellite Telephones at Satellite Handphones Information. This article may be reprinted in full so long as the resource box and the live links are included intact. All rights reserved. Copyright Satellite-Telephones.info

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