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In TDMA, certain calls are assign a time portion rather code or frequency. In todays systems TDMA is mostly used technology.

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Posted by waqqas1

• IS-54 systems, designed to coexist with AMPS systems, divide 30 kHz of spectrum into three channels
• PDC divides 25 kHz slices of spectrum into three channels
• GSM systems create 8 time-division channels in 200 kHz wide carriers

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Posted by cdmaguru

Time division multiple access (TDMA) is a channel access method for shared medium (usually radio) networks. It allows several users to share the same frequency channel by dividing the signal into different timeslots. The users transmit in rapid succession, one after the other, each using his own timeslot. This allows multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only the part of its bandwidth they require. TDMA is used in the digital 2G cellular systems such as Global System for Mobile Communications (GSM), IS-136, Personal Digital Cellular (PDC) and iDEN, and in the Digital Enhanced Cordless Telecommunications (DECT) standard for portable phones. It is also used extensively in satellite systems, and combat-net radio systems.
TDMA is a type of Time-division multiplexing, with the special point that instead of having one transmitter connected to one receiver, there are multiple transmitters. In the case of the uplink from a mobile phone to a base station this becomes particularly difficult because the mobile phone can move around and vary the timing advance required to make its transmission match the gap in transmission from its peers.

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Posted by sagitraz