Wirelesss Communications

 GPRS

GPRS, as an extension of GSM second generation, provides each user with short connection times, virtual connections and data transfer speed up to 115Kbits/s although band width can be shared by more than one user.

This great capacity of band width is possible thanks to use of multiplexing technologies and a combination up to 8 slots of time portion in the radio interface where data travel gathered in packets. GPRS is based on a modulation technique known as Gaussian Minimum Shift Keying (GSMK) which makes a better use of transmission channel width.

Each GPRS terminal has its own IP address and can be managed by another device.

GPRS technology offers special and genuine features such as speed, immediacy, and the possibility of creating new applications and improving the former ones.

 

 

 

UMTS

The Universal Mobile Telecommunications System is one of the Third-Generation (3G) mobile telecommunications system, also called W-CDMA. However, 3G is closely related to GSM
Initially, 3G mobile telecommunications were developed to be used in mobile phones although they are not limited to these devices. The main features of this technology are: multimedia communication, high internet speed which allows audio and video real-time sending and, finally, voice transmission.
UMTS provides several different terrestrial interfaces and requires new cell towers and new frequency allocations. UMTS combines three different air interfaces, GSM’s Mobile Application Par (MAP), core, and the GSM family of speech codecs.