There are several wireless technologies for mobile technology this one, including:
CDMA (Code Division Multiple Access) uses spread-spectrum technology to distribute information signals through a wide bandwidth (1.25 MHz). This technology originally created for military purposes, using a unique digital code, better than RF channel or frequency.
AMPS (Advanced Mobil Phone Service) is an analog technology that uses FDMA (Frequency Domain Multiple Access) to divide the available radio bandwidth to a number of discrete channels that remain. With AMPS, 1.25 MHz bandwidth given to the use of mobile into the canal with a width of 30 KHz, each can serve only one subscriber at a time. One subscriber access to a canal so no one else can access the canal channel until the first call was to stop or handed-off to the BS (base station) the other.
TDMA (Time Division Multiple Access) is a digital technology, as that is, by dividing the available spectrum to the number of discrete channels that remain, although each channel represents a fixed time slot than the fixed frequency band. As an example which implements TDMA technology is GSM, which divides carriers with 2300 KHz wide into eight time division channel. GSM (Global System for Mobile) is a TDMA-based technology.
UMTS (Universal Mobile Telecommunications Access) is one of the third generation system developed in Europe. Designed so that it can provide a bandwidth of 2 Mbits / s. Services that can be pursued to meet the UMTS user requests wherever located, which means that UMTS is expected to serve the widest possible area, if there is no UMTS cell in an area can be a route via satellite. Radio frequencies allocated for UMTS is 1885-2025 MHz. Ribbon will be used by a small cell (pico cell) that can provide large capacity in the UMTS.