Page 519 - 5G Basics - Core Network Aspects

Core network aspects 1

III.4 Mapping from 3GPP entities to ITU-T Y.2018 entities

Table III.1 lists key entities in the 3GPP EPS architecture, their functions, and the ITU-T Y.2018 entities
responsible for those functions.
Table III.1 – Mapping from 3GPP to ITU-T Y.2018 entities

ITU-T Y.2018 entity
3GPP entity Functions performed
responsible
Functions for radio resource management: radio bearer control, radio AN-FE
admission control, connection mobility control, dynamic allocation of
resources to UEs in both uplink and downlink (scheduling)
IP header compression and encryption of user data stream AN-FE
Selection of an MME at UE attachment when no routing to an MME can AR-FE
be determined from the information provided by the UE
Routing of user plane data towards serving gateway AN-FE
eNodeB Scheduling and transmission of paging messages (originated from the AN-FE
MME)

Scheduling and transmission of broadcast information (originated from AN-FE
the MME or O&M)
Measurement and measurement reporting configuration for mobility AN-FE
and scheduling
Scheduling and transmission of ETWS messages (originated from the AN-FE
MME)
NAS signalling NACF

NAS signalling security NACF
AS security control NACF
Inter CN node signalling for mobility between 3GPP access networks NACF
Idle mode UE reachability (including control and execution of paging TBD*
retransmission)

Tracking area list management (for UE in idle and active mode) TBD (Note 1)
Mobility
management entity PDN GW and serving GW selection TBD (Note 2)
(MME)
MME selection for handovers with MME change NACF
SGSN selection for handovers to 2G or 3G 3GPP access networks NACF
Roaming NACF (TAA-FE)
Authentication NACF (TAA-FE)
Bearer management functions including dedicated bearer HDC-FE
establishment
Support for ETWS message transmission NACF
The local mobility anchor point for inter-eNB handover L2HE-FE
Mobility anchoring for inter-3GPP mobility L2HE-FE
E-UTRAN idle mode downlink packet buffering and initiation of network L2HE-FE
triggered service request procedure
Serving gateway Lawful interception EN-FE
Packet routing and forwarding EN-FE
Transport level packet marking in the uplink and the downlink EN-FE
Accounting on user and QCI granularity for inter-operator charging EN-FE
UL and DL charging per UE, PDN, and QCI EN-FE

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