September 2013 doc IEEE 802 11 131060 r
September 2013 doc. : IEEE 802. 11 -13/1060 r 1 3 GPP Liaison Report Date: 2013 -09 -18 Authors: Submission S. Slide Rayment, 1 Ericsson & S. Mc. Cann, Black. Berry
September 2013 doc. : IEEE 802. 11 -13/1060 r 1 3 GPP Projects • WLAN is currently an area of intense activity in 3 GPP Release 12 – SA (System Architecture) – RAN (Radio Access Networks) – Timelines • Stage 2 (requirements studies) nearing completion • Major Stage 2 decisions completed for SA in September 2013 RAN studies extended to December • Stage 3 (specification) complete roughly mid 2014 • The following pages describe the 3 GPP WLAN Interworking architecture and the on-going projects in 3 GPP Release 12 Submission S. Slide Rayment, 2 Ericsson & S. Mc. Cann, Black. Berry
September 2013 doc. : IEEE 802. 11 -13/1060 r 1 3 GPP WLAN Network Architecture • Both trusted (integrated) and untrusted (over-the-top) interfaces exist • The trusted interface involves operator deployed WLAN and is being evolved in 3 GPP Release 12 Submission TWAG S. Slide Rayment, 3 Ericsson & S. Mc. Cann, Black. Berry
September 2013 doc. : IEEE 802. 11 -13/1060 r 1 SA 2 WLAN_NS (WLAN Network Selection) • Work item to specifically evaluate and enhance existing 3 GPP cellular + WLAN network selection policies, taking into account Wi. Fi Alliance (WFA) Passpoint Management Objects (MO) • Focuses on roaming and service related aspects • SA 2 will likely incorporate relevant WFA Passpoint MO branches into the ANDSF tree for WLAN selection purposes, keeping the rest of the branches addressing the cellular + WLAN context • Possible WLAN impacts: – Evaluate new ANDSF policy branches for inclusion into future WFA Passpoint MO – How to do policy push in NSWO (Non Seamless WLAN Offload – i. e. Local Breakout) environments (per 3 GPP TS 23. 402) Submission S. Slide Rayment, 4 Ericsson & S. Mc. Cann, Black. Berry
September 2013 doc. : IEEE 802. 11 -13/1060 r 1 SA 2 Sa. MOG (S 2 a Mobility Over GTP) • Extends the existing solution for connecting a “trusted” (secure) WLAN into the 3 GPP EPC (Evolved Packet Core) using GTP (GPRS Tunnelling Protocol) over an “S 2 a” interface • Currently enables connecting an operator deployed WLAN into the 3 GPP core network (Release 11) • Now adding (Release 12): – IP session mobility between 3 GPP and WLAN – Multiple 3 GPP APNs (services) over WLAN • Possible WLAN impacts: – Control interface to signal handover to WLAN network – EAP extensions – Means to map 3 GPP APNs to WLAN layer 2 interface – Session management using layer “ 2. 5” WLCP (WLAN Control Protocol) and user plane separation using virtual MACs – No mapping to a representative IEEE 802. 11 network architecture Submission S. Slide Rayment, 5 Ericsson & S. Mc. Cann, Black. Berry
September 2013 doc. : IEEE 802. 11 -13/1060 r 1 RAN 2 WLAN/3 GPP Radio Interworking Study • • • Enable enhanced operator control for WLAN interworking Enable WLAN to be included in the operator’s Radio Resource Management Improve access network selection and mobility through knowledge of conditions on both 3 GPP RAN and WLAN • Currently at the study stage, with three directions being considered: 1. 3 GPP RAN provides RAN assistance information to UE to select access technology according to network policies. 2. 3 GPP RAN controls the interworking by providing e. g. thresholds in RAN system information and/or dedicated signaling (behavior similar to cell reselection within and between 3 GPP radio access technologies). 3. 3 GPP RAN configures the UE to perform and report WLAN measurements, and, after evaluation may instruct UE to connect to WLAN. • Possible WLAN impacts: 1. Define enhanced WLAN policies (considering 3 GPP RAN + WLAN context) or 2. Provide the necessary WLAN related information for a 3 GPP RAN control solution Submission S. Slide Rayment, 6 Ericsson & S. Mc. Cann, Black. Berry
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