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3GPP Liaison Report

3GPP Liaison Report. Authors:. Date: 2013-09-16. 3GPP Projects. WLAN currently an area of intense activity in 3GPP Release 12 SA (System Architecture) RAN (Radio Access Networks) Rough timelines Stage 2 (requirements) complete year-end 2013 Decisions for next stage in September 2013

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3GPP Liaison Report

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  1. 3GPP Liaison Report Authors: Date: 2013-09-16 S. Rayment, Ericsson & S. McCann, BlackBerry

  2. 3GPP Projects • WLAN currently an area of intense activity in 3GPP Release 12 • SA (System Architecture) • RAN (Radio Access Networks) • Rough timelines • Stage 2 (requirements) complete year-end 2013 • Decisions for next stage in September 2013 • Stage 3 (specification) complete 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 WFA Hotspot 2.0 Management Objects (MO) • Focuses on roaming and service related aspects • SA2 will likely incorporate relevant WFA HS2.0 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 HS2.0 MO • Remove limitations on policy push in NSWO (Non Seamless WLAN Offload – i.e. Local Breakout) environments (per 3GPP TS23.402) 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 the “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 L2 interface – L“2.5” WLCP (WLAN Control Protocol) using virtual MACs S. Rayment, Ericsson & S. McCann, BlackBerry

  6. RAN2WLAN/3GPP Radio Interworking Study • Real time interworking of WLAN and cellular at the radio level • Improve usage of 3GPP and WLAN radios through knowledge of conditions on both radio networks • Currently at the study stage, with broadly two directions being considered: • 3GPP RAN provides information to assist UE connection manager to better use network policies • 3GPP RAN control solution where mobile device provides information on WLAN conditions to the 3GPP network which evaluates the situation (considering its own conditions) and may instruct UE to connect to WLAN • Possible WLAN impacts: • Define enhanced WLAN policies (considering cellular + WLAN context) or • Provide the necessary WLAN related information for a 3GPP network control solution S. Rayment, Ericsson & S. McCann, BlackBerry

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