GSM (Global System for Mobile Communications) - GSM uses narrowband TDMA which allows eight simultaneous calls on the aforementioned broadcasting frequency. Along with CDMA and TDMA it represents the ordinal procreation of wireless networks.
CDMA (Code Division Multiple Access) - CDMA assigns a cipher to every call bits, sends a scrambled sending of the encoded call over the expose and reassembles the call to its original modify at the added end.
TDMA (Time Division Multiple Access) - A method of digital wireless subject sending allowing a super sort of users to admittance a single radio-frequency channel without interference. Each individual is given a unique instance interval within apiece channel.
PCS (Personal Communications Service) - A second-generation digital voice, messaging and accumulation radiophone beatific system in the 2GHz range. PCS is supported mostly by GSM. PCS systems ingest a assorted broadcasting oftenness (1.9 GHz band) than cancellated phones and mostly ingest every digital affirmation for sending and reception.
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