Whats WCDMA?
GSM is a cellular system used worldwide that was designed in Europe, primarily by Ericsson and Nokia. Cingular and T-Mobile operate nationwide networks in the US. GSM uses a TDMA air interface. TDMA refers to a digital link technology whereby multiple phones share a single carrier, radio frequency channel by taking turns – using the channel exclusively for a certain time slice, then releasing it and waiting briefly while other phones use it. A packet switching enhancement to GSM wireless networks called GPRS was standardized to increase transmission speeds of data. The next generation of GSM, commonly referred to as the third generation or 3G, is known as UMTS (Universal Mobile Telecommunications System) and involves enhancing GSM networks with a Wideband CDMA (W-CDMA) air interface.
