3GPP TR v0.4.0( )

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1 3GPP TR v0.4.0( ) Feasibility Study of Mobility between 3GPP-WLAN Interworking and 3GPP System (Release 8) Report: 易衛漢 2008/11/18

2 Non Roaming WLAN Inter-working Reference Model 3GPP Home Network Intranet / Internet SLF HSS HLR Dw Wx D' / Gr' Wf Offline Charging System WLAN Access Network Wa 3GPP AAA Server Wo OCS Wz WLAN Ww Wn Wg Wm Wy WAG Wp PDG Wi Wu WLAN 3GPP IP Access

3 Roaming WLAN Inter-working Reference Model Intranet / Internet 3GPP Visited Network WLAN Ww WLAN Access Network Wn WAG Wa Wg 3GPP AAA Proxy Wf Offline Charging System Wd Wu WLAN 3GPP IP Access Wp Packet Data Gateway Wi Wm Wy 3GPP AAA Server Wz Wo OCS 3GPP Home Network D' / Gr' Wf Dw Wx SLF HSS HLR Offline Charging System

4 The baseline non-roaming architecture for defining mobility between 3GPP PS system and I-WLAN. 3GPP PS Services (e.g. IMS) TE MT UTRAN R Uu Iu SGSN SGSN Ga /Gp Billing System* Ga GGSN Gy Gi PDN s CGF* OCS* Wi WLAN Intranet/ Internet Ww Wu WLAN Access Network Wn Wa CDF WAG Wf Wg Traffic and signaling Signaling HLR/ AuC* D /Gr Wp Wx 3GPP AAA Server Wm HSS* PDG Wo Wz Dw SLF CGF* Wy Billing System* Note: * Elements duplicated for picture layout purposes only, they belong to the same logical entity in the architecture baseline.

5 Alternative A:TTG 3GPP Home Network Intranet/Internet Dual-Mode Ww WLAN Access Network Wa Wn 3GPP AAA Server Wg Wm WAG Wp TTG Wi/Gi Wu Uu/Um GERAN/ UTRAN Iu-ps/Gb SGSN GGSN Gi Gr (to HLR)

6 Intranet/Internet 3GPP Visited Network Wa 3GPP AAA Proxy Dual-Mode Ww WLAN Access Network Wn WAG Wg Wd Uu/Um GERAN/ UTRAN Iu-ps/Gb SGSN Gp Gp Wp Wm 3GPP AAA Server Wu TTG Wi/Gi GGSN Gi 3GPP Home Network

7 Wm Wp Wu PDG Tunnel Termination Gateway Subset of GGSN functions Gi / Wi Wm Wp Wu TTG Tunnel Termination Gateway /Gp Subset of GGSN functions Gi / Wi

8 I-WLAN to 3G Access System handover (Wi Services)

9 3GPP Access System to I-WLAN handover (Gi Services)

10 Alternative B: Single Tunnel Serving- 3gpp-Anchor solutions

11 Architecture reference model of I- WLAN Mobility solution for a split PDG. Wu CGF --- Ga Billing System Ww WLAN Access Network Wp TTG --- Wm GGSN Gi PDN Wa OCS Gy AAA server Wo Wx HSS Gc S3A D /Gr HLR GERAN / UTRAN Gb / Iu Gr SGSN 3GPP Home Network

12 WLAN Wu GERAN/ UTRAN Gb /Iu TTG Serving Session 3gpp Continuity Anchor Manager Packet Core Other PDN SGSN GGSN IMS Core User plane Control plane

13 Handover from WLAN to GERAN/UTRAN GERAN/UTRAN SGSN Interim S3A Activate PDP Context request(nsapi, - APN, S3A-ADDR) - Anchor S3A GGSN DNS Query for APN Create PDP Context Request (NSAPI,SGSN GTP-U GTP-U TEID, SGSN GTP-C GTP-C TEID, S3A-ADDR) Create PDP Context Request (NSAPI, SGSN GTP-U GTP-U TEID, SGSN GTP-C GTP-C TEID, S3A-ADDR) Update PDP context request (SGSN GTP-U GTP-U TEID, S3A GTP-C GTP-C TEID)* Update PDP context response( ) Create PDP context response(ggsn GTP-U GTP-U TEID, S3A GTP-C S3A GTP-C TEID)* Create PDP context response(ggsn GTP-U GTP-U TEID, S3A GTP-C S3A GTP-C TEID)* Activate PDP Context accept() Subsequent requests Subsequent requests Subsequent requests

14 Handover from GERAN/UTRAN to WLAN TTG S3A AAA server GGSN IPSec tunnel Establishment Activate PDP Context Request (NSAPI, APN, GRE-Key Down, S3A-ADDR) Access-Request/Identity(UserID, APN ) Access-Response( ) Check if the user is authorized for APN Create PDP Context Request (IMSI, NSAPI, APN, TTG GTP-U TTG GTP-UTEID, TTG GTP-C TTG GTP-C TEID) Update PDP Context Request (IMSI, APN, NSAPI,TTG GTP-U TTG GTP-UTEID, S3A GTP-C S3A GTP-C TEID)* Update PDP Context Response () Create PDP Context Response (GGSN GTP-U GGSN GTP-U TEID, S3A GTP-C S3A GTP-C TEID)* Activate PDP Context Accept (GRE-Key Up, ) *Depending on operator s configuration with regards to the user plane path rules, the user plane may go through the S3A. In this case, the S3A sends an Update PDP context request / Create PDP context response with its own TEID and IP addresses for control and user planes.

15 Alternative C:Non-Roaming Architecture for I- WLAN Mobility 3GPP Home Network SLF HSS HLR Dw Wx D /Gr Wf Offline Charging Charging System Dual/ single Mode Ww WLAN Access Network Wu Wa Wn 3GPP AAA 3GPP AAA Server Wg WAG Wo Wm Wp OCS Wy Wz TTG/PDG Wi PDG H 2 (to 3GPP AAA Server) HA Wi+/ Gi+ Uu/Um GERAN/ UTRAN UTRAN Iu-ps/Gb SGSN GR (to HLR) GGSN Gi H 1

16 Information Flow for Initial Attach in I-WLAN and Subsequent Handover to GPRS PDG GGSN HA (1) I-WLAN Attachment and IPSec Tunnel Setup (2) (3) SA Setup via IKEv2 and HoA Assignment (4) DSMIPv6 Binding Update & Acknowledge (5) (6) GPRS Attachment (7) (8) DSMIPv6 Binding Update & Acknowledge (9)

17 Information Flow for Initial Attach in GPRS and subsequent Handover to I-WLAN PDG GGSN HA (1) GPRS Attachment (2) (3) SA Setup via IKEv2 and HoA Assignment (4) DSMIPv6 Binding Update & Acknowledge (5) (6) I-WLAN Attachment and IPSec Tunnel Setup (7) (8) DSMIPv6 Binding Update & Acknowledge (9)

18 comparison Same of the Solution A and B: It is based on GTP tunneling and proposes to use simple mobility mechanisms that are possible because of two simultaneous radios and of IPsec tunneling between and network: there is no need for GPRS/UMTS Mobility Management, in particular no need for neither LA/RA nor context transfers. This solution allows the support of multiple PDP contexts (primary and secondary) for a given APN, and also supports multiple APN.

19 Different of the Solution A and B: A:Via multiple IPsec tunnels and via triggering PDP context activations. When the is in GPRS network, the TTG either works as a GGSN or a proxy GSN. When the is in the WLAN, the TTG terminates the IPsec tunnel. B:Via a single IPsec tunnel and via triggering PDP context activations thanks to a simple -TTG Session Management protocol. This proposal introduces a NAS Session Management protocol (W-SM) between the and the TTG to replace multiple IPsec tunnels by one single IPsec tunnel established at authentication. This solution avoids multiple IPsec tunnel and would allow the maintain of original QoS profile for running sessions when the moves between WLAN and GPRS

20 Solution C: (1).Based on the Dual Stack MIPv6 (2).This solution does not include the description of any roaming solution with the associated charging mechanisms. (3).The solution does not specify any access authentication and authorization procedure. (4).There are some other drawbacks of this solution, the and the HA need to have a DSMIPv6 stack. (5).The drawback associated with this solution is the lack of commercial implementations available today.

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