ETSI - TS 124 008
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Mobile radio interface Layer 3 specification; Core network protocols; Stage 3
|Publication Date:||1 April 2021|
The present document specifies the procedures used at the radio interface core network protocols within the 3rd generation mobile telecommunications system and the digital cellular telecommunications system.
It specifies the procedures used at the radio interface (Reference Point Um or Uu, see 3GPP TS 24.002  or 3GPP TS 23.002 ) for Call Control (CC), Mobility Management (MM), and Session Management (SM).
When the notations for "further study" or "FS" or "FFS" are present in this TS they mean that the indicated text is not a normative portion of the present document.
These procedures are defined in terms of messages exchanged over the control channels of the radio interface. The control channels are described in 3GPP TS 44.003  and 3GPP TS 25.301 .
The structured functions and procedures of this protocol and the relationship with other layers and entities are described in general terms in 3GPP TS 24.007 .
The present document specifies functions, procedures and information which apply to GERAN Iu mode. However, functionality related to GERAN Iu mode is neither maintained nor enhanced.
Scope of the Technical Specification
The procedures currently described in this TS are for the call control of circuit-switched connections, session management for GPRS services, mobility management and radio resource management for circuit-switched and GPRS services.
3GPP TS 24.010  contains functional procedures for support of supplementary services.
3GPP TS 24.011  contains functional procedures for support of point-to-point short message services.
3GPP TS 24.012  contains functional description of short message - cell broadcast.
3GPP TS 44.060  contains procedures for radio link control and medium access control (RLC/MAC) of packet data physical channels.
3GPP TS 44.071 [23a] contains functional descriptions and procedures for support of location services.
NOTE: "layer 3" includes the functions and protocols described in the present document. The terms "data link layer" and "layer 2" are used interchangeably to refer to the layer immediately below layer 3.