The EATF provides IMS-based mechanisms for enabling service continuity of IMS emergency sessions. It is a function
in the serving (visited if roaming) IMS network, providing the procedures for IMS emergency session anchoring and PS to CS access transfer as defined in TS 23.237.
The Equipment Identity Register (EIR) in the GSM system is the logical entity which is responsible for storing in the network the International Mobile Equipment Identities (IMEIs), used in the GERAN/UTRAN/E-UTRAN system.
The equipment is classified as "white listed", "grey listed", "black listed" or it may be unknown as specified in
TS 22.016 and TS 29.002.
Functionality defined for the PDG in TS 23.234 for the allocation of a remote IP address as an IP address
local to the ePDG which is used as CoA when S2c is used;
Functionality for transportation of a remote IP address as an IP address specific to a PDN when S2b is used;
Routing of packets from/to PDN GW (and from/to Serving GW if it is used as local anchor in VPLMN) to/from
UE; if GTP based S2b is used, this includes routing of uplink packets based on the uplink packet filters in the
TFTs assigned to the S2b bearers of the PDN connection;
Routing of downlink packets towards the SWu instance associated to the PDN connection;
De-capsulation/Encapsulation of packets for IPSec and, if network based mobility (S2b) is used, for GTP or
Mobile Access Gateway (MAG) according to the PMIPv6 specification, RFC 5213, if PMIP based S2b is
Tunnel authentication and authorization (termination of IKEv2 signalling and relay via AAA messages);
Local mobility anchor within untrusted non-3GPP access networks using MOBIKE (if needed);
Transport level packet marking in the uplink;
Enforcement of QoS policies based on information received via AAA infrastructure;
Allocation of downlink GRE key for each PDN connection within the ePDG, which is used to encapsulate
downlink traffic to the ePDG on the PMIPv6-based S2b interface.
Accounting for inter-operator charging according to charging principles specified in TS 32.240.
Interfacing OFCS through reference points TS 32.251 for EPC nodes.
For E-UTRAN, the Evolved Serving Mobile Location Centre (E-SMLC) is a server in the core network.
manages the support of different location services for target UEs, including positioning of UEs and delivery of
assistance data to UEs. The E-SMLC may interact with the serving eNodeB for a target UE in order to obtain position
measurements for the UE, including uplink measurements made by the eNodeB and downlink measurements made by
the UE that were provided to the eNodeB as part of other functions such as for support of handover.
The E-UTRAN consists of eNBs, providing the E-UTRA user plane (PDCP/RLC/MAC/PHY) and
control plane (RRC) protocol terminations towards the UE. The eNBs can be interconnected with each other by means
of the X2 interface. The eNBs are connected by means of the S1 interface to the EPC (Evolved Packet Core), more
specifically to the MME (Mobility Management Entity) by means of the S1-MME and to the Serving Gateway (S-GW)
by means of the S1-U interface. The S1 interface supports a many-to-many relation between MMEs / Serving Gateways