GSM Channels

Physical Channels

Associated with frequency bands, time slots, codes

Physical channels transfer bits from one network element to another

Logical Channels

Distinguished by the nature of carried information and the way to assemble bits into data units

Three types

one-to-one: traffic channels between a BTS and a MS

one-to-many: synchronization signals from BTS to MSs in a cell

many-to-one: from MSs to the same BTS