Presentation on theme: "TS **): Non-Roaming Reference Architecture for non-3GPP Accesses"— Presentation transcript:
1 TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses HSSWx***) Colouring of non-3GPP accesses and red arrows (incl. text in red) added for this presentationS4S6a2G/3G SGSNPCRFS3Rx+MMES7S11S1-MMESGiOperator’s IP Services(e.g. IMS, PSS etc.)S10Serving SAE GatewayPDN SAE GatewayEUTRANS5S1-US6cS2bWm*3GPP AAAServerePDGS2cS2aHPLMNWn*Trusted/Untrusted*Non-3GPP IP Accessor 3GPP AccessTrustedNon-3GPP IP AccessNon-3GPP NetworksUntrustedNon-3GPP IP AccessWa*Ta*UE* Untrusted non-3GPP access requires ePDG in the data pathHandovers (Discovery and Selection of non-3GPP Access is needed before)
2 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 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 performedif 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 u, IEEE , 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.
3 Example of HO Message Flow (from informative annex of TS 23.402) Untrustednon-3GPPIP Access2. UE discovers theuntrusted non-3GPPaccess system andinitiates HO