This interface is used to support Inter-RAT
handover from IMS-based voice service over EPS to CS domain over 3GPP UTRAN/GERAN access or from UTRAN
(HSPA) to 3GPP UTRAN/GERAN access and to support Inter-RAT handover from IMS based voice and video service
over EPS to CS domain over 3GPP UTRAN access.
This interface is also used to support Inter-RAT handover from voice
service in CS domain over 3GPP UTRAN/GERAN access to IMS based service over LTE or UTRAN (HSPA).
This interface enables support for the Untrusted non-3GPP IP Access with the 3GPP AAA Server/Proxy and transports access authentication, authorization and charging-related information in a secure manner.
Commands:
DER/DEA: Diameter-EAP-Request/Answer
AAR/AAA: AA-Request/Answer
STR/STA: Session-Termination-Request/Answer
ASR/ASA: Abort-Session-Request/Answer
RAR/RAA: Re-Auth-Request/Answer
See also RFC 6733
for Diameter Base Protocol, and
TS 29.230
for 3GPP-specific Diameter codes and identifiers.
This reference point is used for AAA signalling (transport
of mobility parameters, tunnel authentication and authorization data). It also includes the MAG-AAA interface functionality, RFC 5779 and Mobile IPv6 NAS-AAA
interface functionality, RFC 5447.
Commands:
DER/DEA: Diameter-EAP-Request/Answer
AAR/AAA: AA-Request/Answer
STR/STA: Session-Termination-Request/Answer
ASR/ASA: Abort-Session-Request/Answer
RAR/RAA: Re-Auth-Request/Answer
See also RFC 6733
for Diameter Base Protocol, and
TS 29.230
for 3GPP-specific Diameter codes and identifiers.
This interface supports handling of IPSec tunnels. The functionality of SWu includes UE-initiated tunnel establishment, user data packet transmission within the IPSec tunnel and tear down of the tunnel and support for fast update of IPSec tunnels during handover between two untrusted non-3GPP IP accesses.
This reference point is used to authorize the UE and to transport NBM-related mobility parameters when NBM (Network-Based Mobility) is
used to establish connectivity to the EPC.
It is used to authenticate and authorize the UE when the S2a, S2b or S2c reference points are used to connect to EPC.
It is also used to update the HSS with the PDN-GW address information. Additionally, it may be used to retrieve and update other mobility related parameters including static QoS profiles for
non-3GPP accesses.
Commands:
MAR/MAA: Multimedia-Authentication-Request/Answer
PPR/PPA: Push-Profile-Request/Answer
SAR/SAA: Server-Assignment-Request/Answer
RTR/RTA: Registration-Termination-Request/Answer
See also RFC 6733
for Diameter Base Protocol, and
TS 29.230
for 3GPP-specific Diameter codes and identifiers.
The Sy reference point enables transfer of policy counter status information relating to subscriber spending from OCS
to PCRF and supports the following functions:
Request for reporting of policy counter status information from PCRF to OCS and subscribe to or unsubscribe
from spending limit reports (i.e. notifications of policy counter status changes).
Report of policy counter status information upon a PCRF request from OCS to PCRF.
Notification of spending limit reports from OCS to PCRF.
Cancellation of spending limit reporting from PCRF to OCS.
Since the Sy reference point resides between the PCRF and OCS in the HPLMN, roaming with home routed or visited
access as well as non-roaming scenarios are supported in the same manner.
