Wireless network Evolution from 2G to 2.5G and what is 2.5G wireless network?

 Evolution to 2.5G Mobile Radio Networks:

• The 2G digital standards have been widely used by wireless carriers for cellular and PCS since the 1990s. They use circuit-switched data modems that limit the data users to a signal circuit-switched voice channel. 
• Thus, the data transmissions in 2G standards are generally limited to the data throughout rate of an individual user. 
• Each and every 2G standard specifies different coding schemes and error protection algorithms for data transmission versus voice transmissions. 
• However the data throughput rate for the computer data is approximately the same as the throughput rate for speech coded voice data in all 2G standards.
• The short messaging service (SMS) is a feature of GSM. The subscribers can send short real time messages to the other subscribers in the same network by dialing the receiver's mobile phone number.
• In order to make the 2G standards compatible with the increased output data rates that are desired for modern Internet applications, new standards have been developed. These new standards are upgraded upon the existing 2G standards.
• These new standards represents 2.5G technology. They allow the existing 2G handsets to be modified and implemented with new base station add-ons and subscriber unit software upgrades to support higher data rates transmission for web browsing, e-mail traffic mobile commerce (m-commerce), location-based mobile services. 
• The 2.5G technologies also support web browsing format language, called Wireless Application Protocol (WAP). WAP allows the web pages to be observed in a compressed format. WAP is designed for small, portable hand held devices.
• For a specific wireless network the 2.5G upgrade path must match with the earlier 2G technology by the same network so that it is compatible at the base station.
• A wide range of 2.5G standards have been developed to allow each of the 2G technology (IS-136, GSM, CDMA) to be upgraded for faster Internet data rates.

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