Editing My 3GPP TS 24.007 Notes (section)

== 4 Introduction § 4.1 General ==
Five models are defined for Layer 3, one model for non-GPRS services, one for GPRS services supporting Class C MSs only, one model for GPRS-services supporting Class A and Class B MSs, one model for EPS services and '''one model for 5GS services over either 3GPP access or over non-3GPP access'''.

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The layer 3 for 5GS services is composed of three sublayers comprising:
* the 5GS radio resource management (5GRR) functions for NAS over 3GPP access or the non-3GPP access functions for NAS over non-3GPP access;
* the 5GS mobility management (5GMM) functions; and
* the 5GS connection management (5GCM) functions.

The 5GS mobility management (5GMM) sublayer is composed of a functional block for:
* the 5GS mobility management (5GMM) functions.

The 5GS connection management (5GCM) sublayer is composed of a functional block for:
* the 5GS session management (5GSM) functions.

:NOTE:	For NAS over non-3GPP access, the non-3GPP access functions can be supported through functionalities defined in IETF RFC 7296 [30].

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