E.2 Gateway Relocation with MIPv4 FACoA on S2a
23.4023GPPArchitecture enhancements for non-3GPP accessesRelease 18TS
Figure E.2-1: Gateway Relocation when MIPv4 FACoA mode MM mechanism is used over S2a
When the Gateway Relocation procedure occurs in the Non-Roaming case (Figure 4.2.2-1), the vPCRF is not involved.
In the case of Roaming (Figure 4.2.3-1) and Local Breakout (Figure 4.2.3-4), the vPCRF is employed to forward messages from the hPCRF in the home PLMN, by way of the vPCRF in the VPLMN to the non-3GPP access.
1) A gateway relocation is triggered, to be initiated by the UE. This trigger is outside the scope of 3GPP standardization.
2) The UE sends a Registration Request (RRQ) RFC 5944 [12] message to the FA. Reverse Tunnelling shall be requested. This ensures that all traffic will go through the PDN GW. The RRQ message shall include the NAI-Extension RFC 2794 [34] and the Home Agent Address.
3) The Trusted non-3GPP access initiates the Gateway Control Session Establishment Procedure with the PCRF, as specified in TS 23.203 [19]. The Trusted non-3GPP access provides the information to the PCRF to correctly associate it with the IP CAN session to be established in Step 9 and also to convey subscription related parameters to the PCRF.
4) The FA processes the message according to RFC 5944 [12] and forwards a corresponding RRQ message to the PDN GW.
5) The PDN GW allocates an IP address for the UE and sends a Registration Reply (RRP) RFC 5944 [12] to the FA, including the IP address allocated for the UE.
6) The Trusted Non-3GPP Access Network initiates the Gateway Control Session Termination Procedure with the PCRF as specified in TS 23.203 [19]. The Trusted Non-3GPP Access Network no longer applies QoS policy to service data flows for this UE.
7) The FA processes the RRP according to RFC 5944 [12] and sends a corresponding RRP message to the UE.
8) IP connectivity from the UE to the PDN GW is now setup. A MIP tunnel is established between the FA in the Trusted Non-3GPP IP Access and the PDN GW.
Annex F (informative):
Deployment of Non-3GPP Trusted WLAN Access on S2a
WLAN networks may be deployed such that separate SSIDs are used for EPC-routed and non-seamless WLAN offload, e.g. <ssid_a> and <ssid_b>.
WLAN networks may also be deployed such that the same SSID in a WLAN Access Point provides different type of network access to different users attached to this Access Point. For example, a given SSID <ssid_x> may provide EPC-routed access for subscriber A and only allow non-seamless WLAN offload for subscriber B. In such a deployment it is up to the operator to provide network configuration that supports different user access preferences, subscriptions and UE configurations.
It is recommended that the UE can be configured to apply different behavior when connected to different SSIDs, e.g. allow or prevent the usage of certain applications on specific SSIDs. For example, for the SSIDs used for EPC access through S2a over Trusted WLAN, the UE can be configured to disable applications that require local connectivity (e.g. DLNA applications) and enable applications that require EPC connectivity to the default APN used for access through S2a over Trusted WLAN. Such kind of special behavior for SSIDs used for EPC access through S2a over Trusted WLAN can improve the user experience and prolong the UE battery life.
NOTE: A UE can be configured to apply different behavior when connected to different SSIDs by means which are outside the scope of this document. For example, the UE can be configured over-the-air, by means of a downloadable application, or manually.
Annex G (informative):
Change History
|
Change history |
|||||||
|
Date |
Meeting |
TDoc |
CR |
Rev |
Cat |
Subject/Comment |
New version |
|
2014-12 |
SP-66 |
SP-140693 |
1329 |
2 |
B |
TWAN release cause for Trusted WLAN |
13.0.0 |
|
2015-03 |
SP-67 |
SP-150027 |
1339 |
1 |
B |
GTP-C overload control from TWAN/ePDG to PGW |
13.1.0 |
|
2015-03 |
SP-67 |
SP-150020 |
1342 |
1 |
A |
SPExclusionList in WLANSP |
13.1.0 |
|
2015-03 |
SP-67 |
SP-150027 |
1343 |
2 |
B |
Support prefix delegation in PMIP-based S5/S8 |
13.1.0 |
|
2015-03 |
SP-67 |
SP-150027 |
1344 |
2 |
F |
PMIP Prefix Delegation reference correction |
13.1.0 |
|
2015-03 |
SP-67 |
SP-150016 |
1346 |
1 |
A |
Adding description of missing S2a system architecture alternative |
13.1.0 |
|
2015-03 |
SP-67 |
SP-150027 |
1355 |
1 |
F |
Removing incorrect references to I-WLAN specifications |
13.1.0 |
|
2015-03 |
SP-67 |
SP-150020 |
1356 |
– |
A |
Prioritized PreferredSSIDList |
13.1.0 |
|
2015-06 |
SP-68 |
SP-150239 |
1360 |
1 |
F |
Clarification of Impacts when Gxx is not used for eHRPD Access |
13.2.0 |
|
2015-06 |
SP-68 |
SP-150239 |
1366 |
2 |
F |
Session/bearer release cause over S2b |
13.2.0 |
|
2015-09 |
SP-69 |
SP-150503 |
1368 |
3 |
B |
ePDG selection for emergency bearer services |
13.3.0 |
|
2015-09 |
SP-69 |
SP-150503 |
1380 |
2 |
B |
Introduction of the Support of Emergency services over WLAN access to EPC |
13.3.0 |
|
2015-09 |
SP-69 |
SP-150505 |
1376 |
4 |
C |
Revision of ePDG selection procedures |
13.3.0 |
|
2015-12 |
SP-70 |
SP-150613 |
1391 |
2 |
F |
Corrections to ePDG selection |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150613 |
2902 |
– |
F |
Correction to handover between ePDGs |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150613 |
2906 |
5 |
F |
Supporting Location reporting for IMS sessions over S2b. |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150602 |
2908 |
1 |
A |
Clarification of S2a architecture |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150617 |
2909 |
1 |
F |
Conveying to the EPC the IMEI of devices accessing a trusted or untrusted WLAN |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150613 |
2910 |
2 |
F |
Transfer of User Location Information at Create Session Request over S2b |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150613 |
2912 |
2 |
F |
ePDG supporting emergency services only |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150613 |
2916 |
4 |
F |
Keeping WLAN Location Information up to date |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150615 |
2917 |
2 |
B |
Addition of LWA support |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150615 |
2918 |
2 |
B |
Addition of CRLWI support |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150615 |
2920 |
4 |
C |
Corrections to ePDG selection procedure |
13.4.0 |
|
2015-12 |
SP-70 |
SP-150615 |
2921 |
1 |
F |
Clarifications on the ePDG Delete Session procedure |
13.4.0 |
|
2016-03 |
SP-71 |
SP-160162 |
2922 |
4 |
F |
Clarification on ANDSF precedence |
13.5.0 |
|
2016-03 |
SP-71 |
SP-160160 |
2925 |
1 |
F |
Correction to ePDG selection for emergency bearer services |
13.5.0 |
|
2016-03 |
SP-71 |
SP-160160 |
2926 |
– |
F |
Sending an Emergency-Indication to the 3GPP AAA Server over S6b |
13.5.0 |
|
2016-03 |
SP-71 |
SP-160162 |
2933 |
3 |
C |
Updated ePDG Selection Procedure |
13.5.0 |
|
2016-03 |
SP-71 |
SP-160162 |
2934 |
3 |
F |
Coexistence between ANDSF and LWA |
13.5.0 |
|
2016-06 |
SP-72 |
SP-160285 |
2928 |
2 |
A |
Clarification on TWAN authorization |
13.6.0 |
|
2016-06 |
SP-72 |
SP-160298 |
2941 |
1 |
F |
Correction of UICC precedence |
13.6.0 |
|
2016-06 |
SP-72 |
SP-160298 |
2942 |
2 |
F |
Corrections for ePDG selection fallback |
13.6.0 |
|
2016-06 |
SP-72 |
SP-160298 |
2943 |
1 |
F |
Corrections to ePDG selection procedure for UE determined location |
13.6.0 |
|
2016-06 |
SP-72 |
SP-160300 |
2944 |
1 |
B |
IMEI check for EPC access via untrusted WLAN |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160300 |
2945 |
2 |
B |
IMEI check for EPC access via trusted WLAN |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160301 |
2948 |
1 |
B |
Support of EAP Re-authentication for WLAN Interworking |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160302 |
2949 |
4 |
B |
Revision of S2b GTP procedure for ES for UE without valid IMSI |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160302 |
2950 |
1 |
B |
Introduction of ES based on FS_SEW2 results |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160300 |
2951 |
1 |
F |
IMEI check for S2b GTP |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160302 |
2952 |
1 |
B |
Determining Location and Country for IMS Emergency Session over WLAN access |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160302 |
2953 |
1 |
B |
User identification for emergency services over WLAN |
14.0.0 |
|
2016-06 |
SP-72 |
SP-160302 |
2955 |
2 |
C |
ePDG Selection for Emergency Services |
14.0.0 |
|
2016-09 |
SP-73 |
SP-160644 |
2956 |
– |
A |
Source TCP port provided over S2b |
14.1.0 |
|
2016-09 |
SP-73 |
SP-160652 |
2958 |
2 |
F |
Clarifications of ePDG Selection for Emergency Services |
14.1.0 |
|
2016-09 |
SP-73 |
SP-160652 |
2961 |
3 |
F |
Initial Attach procedure for ES for S2a GTP |
14.1.0 |
|
2016-09 |
SP-73 |
SP-160652 |
2964 |
2 |
B |
Support of emergency services when UE attached to regular services for untrusted WLAN |
14.1.0 |
|
2016-09 |
SP-73 |
SP-160652 |
2965 |
2 |
B |
Introduction of emergency services for trusted WLAN and roaming cases |
14.1.0 |
|
2016-09 |
SP-73 |
SP-160652 |
2966 |
4 |
B |
Support of emergency services continuity between WLAN and 3GPP access |
14.1.0 |
|
2016-12 |
SP-74 |
SP-160817 |
2967 |
3 |
F |
Correction of emergency services continuity between WLAN and 3GPP access |
14.2.0 |
|
2017-03 |
SP-75 |
SP-170047 |
2969 |
– |
F |
Conditions for issuing emergency session via WLAN |
14.3.0 |
|
2017-06 |
SP-76 |
SP-170367 |
2970 |
1 |
F |
Emergency sessions in trusted WLAN with unauthenticated UE |
14.4.0 |
|
2017-06 |
SP-76 |
SP-170363 |
2975 |
1 |
A |
PGW selection for WLAN with deployed DCNs |
14.4.0 |
|
2017-06 |
SP-76 |
SP-170377 |
2971 |
3 |
B |
Support for e2e QoS over untrusted WLAN |
15.0.0 |
|
2017-06 |
SP-76 |
SP-170377 |
2972 |
3 |
B |
Support for e2e QoS over trusted WLAN |
15.0.0 |
|
2017-09 |
SP-77 |
SP-170731 |
2976 |
2 |
F |
Support for multiple bearers in a single request |
15.1.0 |
|
2017-09 |
SP-77 |
SP-170721 |
2978 |
1 |
A |
Solving ambiguities on whether to consider UEs without UICC |
15.1.0 |
|
2017-12 |
SP-78 |
SP-170923 |
2979 |
– |
F |
Correction to ePDG handling of multiple IPSEC SA for untrusted WLAN |
15.2.0 |
|
2017-12 |
SP-78 |
SP-170919 |
2980 |
1 |
B |
OI#19 – 5GC-EPC interworking: PGW selection for 5GC UE for connectivity via untrusted access |
15.2.0 |
|
2017-12 |
SP-78 |
SP-170916 |
2982 |
– |
A |
ePDG and TWAN emergency configuration data |
15.2.0 |
|
2017-12 |
SP-78 |
SP-170919 |
2983 |
3 |
B |
Transfer of PCO over untrusted acess |
15.2.0 |
|
2018-03 |
SP-79 |
SP-180094 |
2984 |
– |
B |
Enabling ePDG selection using 5GS TAI information |
15.3.0 |
|
2018-03 |
SP-79 |
SP-180087 |
2986 |
– |
A |
Emergency ePDG selection for UE without UICC |
15.3.0 |
|
2018-03 |
SP-79 |
SP-180083 |
2990 |
– |
A |
Correction to 4G non-3GPP location issue |
15.3.0 |
|
2019-06 |
SP-84 |
SP-190399 |
2994 |
1 |
F |
Moving 5GS Interworking aspects to 5GS Specifications |
16.0.0 |
|
2021-03 |
SP-91E |
SP-210087 |
2996 |
1 |
D |
Inclusive language review |
17.0.0 |
|
2022-12 |
SP-98E |
SP-221087 |
2997 |
1 |
B |
Support of Non-3GPP access for SNPN |
18.0.0 |