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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
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)

key issue nw discovery selection nw ds excerpt from tr 23 882
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.
example of ho message flow from informative annex of ts 23 402
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