In cellular system, there are 3 basic method for user to access channel for establishing a connection :
- FDMA (Frequency Division Multiple Access), divided user by frequency, means each user have its own frequency range to use as a communication channel
- TDMA (Time Division Multiple Access), divided user by time slot, means each user have its own time slot (same frequency range) to use as a communication channel, these time slot is in mili second, so user almost feels nothing while it in a continous connection such as voice call
- CDMA (Code Division Multiple Access), divided user by code, means each user have its own unique code (same frequency range at a same time) to use as a communication channel, so user information is coded before enter the network at source user side and decoded again at target user side
From picture and explanation above, can be known, that TDMA is more advantage than FDMA, and CDMA is more advantage than TDMA
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