1 Trusted Non-3GPP IP Access TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses...
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Transcript of 1 Trusted Non-3GPP IP Access TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses...
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Trusted Non-3GPP IP Access
TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses
Trusted/Untrusted* Non-3GPP IP
Access or 3GPP Access
SGi
PCRF
S7
S6a
HSS
ePDG
S2b
Serving SAE
Gateway
Wn*
3GPP AAA Server
Operator’s IP Services
(e.g. IMS, PSS etc.)
Wm*
Wx*
UntrustedNon-3GPP IP Access
Wa*
Ta*
HPLMN
Non-3GPP Networks
S1-U
S1-MME
EUTRAN
2G/3G SGSN
S4
S3
S5S6c
Rx+
S2a
PDN SAE
Gateway
MME S11
S10
UE
S2c
* Untrusted non-3GPP access requires ePDG in the data path
Handovers (Discovery and Selection of non-3GPP Access is needed before)
**) Colouring of non-3GPP accesses and red arrows (incl. text in red) added for this presentation
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Key Issue NW Discovery & Selection (NW-DS)(Excerpt from TR 23.882)
It is necessary to optimize NW-DS procedures for frequent mobility events.
It is desirable that the concept for NW-DS in SAE supports effective means for minimizing processing.
Looking at the currently defined NW-DS principles for I-WLAN in TS 23.234 it becomes clear that they cannot be extended for time critical handovers and for other RATs, due to complexity and latency:
per available WLAN access NW a scan/probe has to be performed if a WLAN AN is connected to more than one 3GPP NW this is only detected after L2 association and trying authentication.
It is therefore necessary to develop or adopt new, more efficient mechanisms, for both idle and active mode (where this differentiation is applicable).
Solutions may be based on concepts developed in other fora (e.g. IEEE 802.11u, IEEE 802.21, IETF) or based on concepts defined by 3GPP (e.g. provision of specific databases). Further mechanisms are FFS. When selecting solutions, the amount of signalling, size of stored and transferred data, especially over the radio interface, and terminal power consumption shall be taken into account.
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Example of HO Message Flow (from informative annex of TS 23.402)
Ipsec Tunnel
ePDGMME-EUTRAN
Untrusted Non-3GPPIP Access
UE
2. UE discovers the untrusted non-3GPP access system and
initiates HO
PDNGW
HSS/AAA
7. BU/BA (IP Addr)
PCRFServing GW
1. GTP/PMIPv6 Tunnel
3. Access Authentication
8. DSMIPv6 Tunnel
3. Access Auth
6. IKEv2/Ipsec SA setup6. AAA Auth/
Authz
5. IKEv2/Ipsec SA setup (CoA config) 5. AAA Auth/ Authz
4. ePDG Discovery
Untrustednon-3GPP IP Access
2. UE discovers the untrusted non-3GPP access system and
initiates HO