Wireless and Mobile Technologies
Today the wireless communication is achieving the higher data rates. Further the use of mobile is growing rapidly across the global with increasing needs of information sharing. It allows the users equipped with cell phones, PDAs or other portable networking devices to communicate with other devices. There are many wireless communication technologies available for transmission. The cellular system is most commonly used in mobile communication. In cellular system, the coverage area is divided in square shaped or hexagonal cells. The cellular based GSM network has four major systems: Switching System (SS), Base Station System (BSS), Mobile Station (MS) and Operation and Maintenance Center (OMC). Switching System performs call processing and subscriber-related functions. The switching system further comprise of functional units: Mobile Switching Center, Home Location Register, Visitor Location Register, Equipment Identity Register and Authentication Center. General Packet Radio Service (GPRS) adds Packet Control Unit (PCU), Serving GPRS Support Node (SGSN), Gateway GPRS Support Node (GGSN), Border Gateway (BG) and Intra-PLMN backbone to the existing GSM network to provide additional services.