An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slots...http://www.google.co.uk/patents/US6532225?utm_source=gb-gplus-sharePatent US6532225 - Medium access control layer for packetized wireless systems
