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3GPP Liaison Report

3GPP Liaison Report. Authors:. Date: 2013-09-18. 3GPP Projects. WLAN is currently an area of intense activity in 3GPP Release 12 SA (System Architecture) RAN (Radio Access Networks) T imelines Stage 2 ( requirements studies) nearing completion

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3GPP Liaison Report

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  1. 3GPP Liaison Report Authors: Date: 2013-09-18 S. Rayment, Ericsson & S. McCann, BlackBerry

  2. 3GPP Projects • WLAN is currently an area of intense activity in 3GPP 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 2013RAN studies extended to December • Stage 3 (specification) complete roughly mid 2014 • The following pages describe the 3GPP WLAN Interworking architecture and the on-going projects in 3GPP Release 12 S. Rayment, Ericsson & S. McCann, BlackBerry

  3. 3GPP 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 3GPP Release 12 TWAG S. Rayment, Ericsson & S. McCann, BlackBerry

  4. SA2WLAN_NS (WLAN Network Selection) • Work item to specifically evaluate and enhance existing 3GPP cellular + WLAN network selection policies, taking into account Wi-Fi Alliance (WFA) Passpoint Management Objects (MO) • Focuses on roaming and service related aspects • SA2 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 3GPP TS 23.402) S. Rayment, Ericsson & S. McCann, BlackBerry

  5. SA2SaMOG (S2a Mobility Over GTP) • Extends the existing solution for connecting a “trusted” (secure) WLAN into the 3GPP EPC (Evolved Packet Core) using GTP (GPRS Tunnelling Protocol) over an “S2a” interface • Currently enables connecting an operator deployed WLAN into the 3GPP core network (Release 11) • Now adding (Release 12): • IP session mobility between 3GPP and WLAN • Multiple 3GPP APNs (services) over WLAN • Possible WLAN impacts: • Control interface to signal handover to WLAN network – EAP extensions • Means to map 3GPP 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 S. Rayment, Ericsson & S. McCann, BlackBerry

  6. RAN2WLAN/3GPP 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 3GPP RAN and WLAN • Currently at the study stage, with three directions being considered: • 3GPP RAN provides RAN assistance information to UE to select access technology according to network policies. • 3GPP 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 3GPP radio access technologies). • 3GPP RAN configures the UE to perform and report WLAN measurements, and, after evaluation may instruct UE to connect to WLAN. • Possible WLAN impacts: • Define enhanced WLAN policies (considering 3GPP RAN + WLAN context) or • Provide the necessary WLAN related information for a 3GPP RAN control solution S. Rayment, Ericsson & S. McCann, BlackBerry

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