Introduction to Global System for Mobile Communication (GSM): Physical Channels, Logical Channels, Network, and Operation

A radio channel is a communications channel that uses radio waves to transfer information from a source to destination. A radio channel may transport one or many communication channels and communication circuits.
Radio channel bandwidth is the difference between the upper frequency limit and lower frequency limit of allowable radio transmission energy for a radio communication channel. The GSM radio channel has a 200 kHz channel bandwidth.