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TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses

TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses. HSS. Wx*. **) Colouring of non-3GPP accesses and red arrows (incl. text in red) added for this presentation. S6a. S4. 2G/3G SGSN. PCRF. S3. Rx+. S7. MME. S11. Operator’s IP Services (e.g. IMS, PSS etc.). SGi.

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TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses

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  1. TS 23.402**): Non-Roaming Reference Architecture for non-3GPP Accesses HSS Wx* **) Colouring of non-3GPP accesses and red arrows (incl. text in red) added for this presentation S6a S4 2G/3G SGSN PCRF S3 Rx+ S7 MME S11 Operator’s IP Services (e.g. IMS, PSS etc.) SGi S1-MME Serving SAE Gateway PDN SAE Gateway S10 EUTRAN S5 S1-U S6c S2b Wm* 3GPP AAA Server ePDG S2a S2c Wn* HPLMN Non-3GPP Networks Trusted Non-3GPP IP Access Untrusted Non-3GPP IP Access Trusted/Untrusted* Non-3GPP IP Access or 3GPP Access Wa* Ta* UE * Untrusted non-3GPP access requires ePDG in the data path Handovers (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 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.

  3. Example of HO Message Flow (from informative annex of TS 23.402) Untrusted non-3GPP IP Access 2. UE discovers the untrusted non-3GPP access system and initiates HO

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