Editing Channel access method (section)

===Time-division multiple access===
The [[time-division multiple access]] (TDMA) channel access scheme is based on the [[time-division multiplexing]] (TDM) scheme. TDMA provides different time slots to different transmitters in a cyclically repetitive frame structure. For example, node 1 may use time slot 1, node 2 time slot 2, etc., until the last transmitter when it starts over. An advanced form is dynamic TDMA (DTDMA), where an assignment of transmitters to time slots varies on each frame.

[[Multi-frequency time-division multiple access]] (MF-TDMA) combines time and frequency multiple access. As an example, [[2G]] cellular systems are based on a combination of TDMA and FDMA. Each frequency channel is divided into eight time slots, of which seven are used for seven phone calls and one for [[signaling (telecommunications)|signaling]] data.

[[Statistical time-division multiplexing]] multiple access is typically also based on time-domain multiplexing, but not in a cyclically repetitive frame structure. Due to its random character, it can be categorized as [[statistical multiplexing]] methods and capable of [[dynamic bandwidth allocation]]. This requires a [[media access control]] (MAC) protocol, i.e., a principle for the nodes to take turns on the channel and to avoid collisions. Common examples are [[CSMA/CD]], used in [[Ethernet]] bus networks and hub networks, and [[CSMA/CA]], used in wireless networks such as [[IEEE 802.11]].