This TS specifies the procedures used by the protocols for mobility management and session management
between User Equipment (UE) and Mobility Management Entity (MME) in the Evolved Packet System (EPS). These
protocols belong to the non-access stratum (NAS).
The EPS Mobility Management (EMM) protocol defined in this TS provides procedures for the control of
mobility when the UE is using the E-UTRAN.
The EMM protocol also provides control of security for the NAS protocols.
The EPS Session Management (ESM) protocol defined in this TS provides procedures for the handling of
EPS bearer contexts. Together with the bearer control provided by the access stratum, this protocol is used for the control of user plane bearers.
For both NAS protocols this TS specifies procedures for the support of inter-system mobility between
E-UTRAN and other 3GPP or non-3GPP access networks:
For inter-system mobility between E-UTRAN and GERAN or UTRAN, this includes rules for a mapping
between parameters and procedures used by the NAS protocols defined in this TS and the NAS
protocols specified in TS 24.008.
For inter-system mobility between E-UTRAN and generic non-3GPP access networks, this includes specific
NAS procedures to maintain IP connectivity to the PDN Gateway and to provide parameters needed by the UE
when using mobility management based on Dual-Stack Mobile IPv6 (see TS 24.303) or MIPv4
This TS is applicable to the UE and to the Mobility Management Entity (MME) in the EPS.
It is also applicable to the relay node in the EPS (see TS 23.401
to see the ToC for advanced Rel-15 Word version