This Technical Specification specifies the procedures used at the radio interface (Reference Point Um, see GSM TS 04.02) for Call Control (CC), Mobility Management (MM) and Radio Resource (RR) management.
The layer 3 procedures apply to the interface structures defined in TS GSM 04.03. They use the functions and services provided by layer 2 defined in TS GSM 04.05 and 04.06. TS GSM 04.07 gives the general description of layer 3 including procedures, messages format and error handling.
