scope:

This ETS specifies the procedures used at the radio interface (Reference Point Um, (see GSM 04.02) for Call Control (CC), Mobility Management (MM) and Radio Resource (RR) management.

When the notations for "further study" or "FS" or "FFS" are present in this ETS they mean that the indicated text is not a normative portion of this standard.

These procedures are defined in terms of messages exchanged over the control channels of the radio interface. The control channels are described in GSM 04.03.

The structured functions and procedures of this protocol and the relationship with other layers and entities are described in general terms in GSM 04.07. 

Scope of the Technical Specification

The procedures currently described in this ETS are for the call control of circuit-switched connections, mobility management and radio resource management.

GSM 04.10 contains functional procedures for support of supplementary services.

GSM 04.11 contains functional procedures for support of point-to-point short message services.

GSM 04.12 contains functional description of short message - cell broadcast.

NOTE 1: "layer 3" includes the functions and protocols described in this Technical Specification.

The terms "data link layer" and "layer 2" are used interchangeably to refer to the layer immediately below layer 3.