30-07-2009, 05:03 PM
Todayâ„¢s mobile professionals need to stay in regular contact with important sources of information such as the Internet, email, corporate networks and remote databases. As demand for Wide Area Networking (WAN) connectivity continues to grow, users and organizations are seeking ways to make it more efficient and productive. One of the most promising new technologies for this purpose is General Packet Radio Service (GPRS). GPRS is a packet-switching data network that is overlaid on the existing cellular voice network, using the same radio frequencies and cellular towers. When combined with the existing Global System for Mobile communication (GSM), GPRS offers a complete voice and data solution with significant advantages over other solutions.
GPRS offers the flexibility and throughput of packet switching. GPRS uses packet switching to transfer data from the mobile device to the network and back. On a packet switched network a device can be always connected and ready to send information without monopolizing the channel. Channels are shared in packet-switched network, but in circuit-switched each channel is dedicated to one user. There are no call up or suspend delays.
http://www.http://pptpdf.net//?file=/computer%20science%20and%20electronics/General%20Packet%20Radio%20Service.pdf&name=General%20Packet%20Radio%20Service.pdf