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GSM GPRS EDGE 3G WCDMA HSDPA

GSM

GSM, stands for Global Systems for Mobile Communications, is basic standard bearer of 2G technologies. It is mainly used in mobile communication. Short Messaging System (SMS) was introduced into GSM networks along with capability to download content from various service providers. The content could ring tone, logos and picture messages.



It can support Voice telephony and Data however the Data rate is only 9.6Kb/s, that is very low bit rate for date communication.

GPRS




GPRS, stands for General Packet Radio Service, is used to give higher data speed over GSM. It is not the replacement of GSM. It is just a extension to the older GSM technology to gain faster speed.



Multimedia Messaging System or MMS is the feature of GPRS. It allowed subscribers to send videos, pictures, or sound clips to each other just like text messages. GPRS also provided mobile handset the ability to surf the Internet at dial-up speeds through WAP enabled sites.



GPRS offered higer bit rate ( Up to 171kb/s) by usage of A packet-linked technology over GSM.



EDGE


• EDGE stands for Enhanced Data Rates for GSM Evolution. This technology, also termed as Enhanced GPRS.

• This is a technology that uses the same equipment as GSM with only a few minor modifications to provide faster data speeds and is often regarded as a stepping stone towards 3G thus it is called 2.5G.

• EDGE gives the users the inimitable chance to increase the throughput capacity and the data speed at least 3 to 4 times higher to what GPRS offers.

• EDGE is a digital mobile phone technology but GPRS is a mobile data service.

• It is a 3G Radio technology and GPRS or General Packet Radio Service is essentially packet oriented.

3G


• The introduction of 3G changed a lot of the accepted standards in the mobile phone industry. It allows the use of a greater bandwidth that allows more features to be implemented on it.

• 3G gives many features like video calls and TV applications because of the speed of 3G which began at 384kbps; well within DSL speeds. Further development on 3G technologies have also created even faster data rate reaching 3.6 and even 7.2Mbps.

• Existing GSM networks are not compatible with the 3G networks. To keep it, requires a new infrastructure.

• According to popularity and demand Telecom Operators place 3G towers in those areas.They have to operate 2 radios in particular areas; one for GSM and one for 3G.

• Mobile phone Users are also required to switch mobile phones in order to take advantage of the new features of 3G.

WCDMA



3G Networks are based on WCDMA i.e. Wideband Code Division Multiple Access, a mobile technology that improves upon the capabilities of current GSM networks.



HSDPA


HSDPA (High Speed Downlink Packet Access) is what is also known as 3.5G, as it offers no substantial upgrade to the feature set of WCDMA, but improves the speed of data transmission to enhance those services.

WCDMA networks provides max 384kbps speed whileHSDPA allowed speeds above 384kbps, the most notable of which is 3.6Mbps and 7.2Mbps.

HSDPA has lower latency times and Fast Packet Scheduling compared to WCDMA.

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