doc.: IEEE 802.11-14/0154r0

Submission

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 1

3GPP Liaison ReportDate: 2014-01-22

Authors:

doc.: IEEE 802.11-14/0154r0

Submission

3GPP Projects

• WLAN is currently an area of intense activity in 3GPP Release 12– SA (System Architecture)– RAN (Radio Access Networks)– CT (Core Networks)– Timelines

• Stage 2 (requirements studies) complete• 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

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 2

doc.: IEEE 802.11-14/0154r0

Submission

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

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 3

TWAG

doc.: IEEE 802.11-14/0154r0

Submission

SA2/CT1WLAN_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)

• SA2 have incorporated relevant WFA Passpoint MO branches into the ANDSF tree for WLAN selection purposes

• Possible WLAN impacts:– Evaluate new ANDSF policy additions for inclusion into future WFA

Passpoint MO

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 4

doc.: IEEE 802.11-14/0154r0

Submission

SA2/CT1SaMOG (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

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 5

doc.: IEEE 802.11-14/0154r0

Submission

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 through knowledge of conditions on both 3GPP RAN and WLAN

• This is now a RAN approved work item:– For both Access Network Selection and Traffic Routing . . .

– 3GPP RAN provides RAN assistance information, e.g. thresholds, to the UE

– Information is used by the UE to select access network, guided by either:• RAN rules

• ANDSF policies

• The solution supports deployments with or without ANDSFIncluding co-existence of ANDSF and RAN when both are deployed

• Possible WLAN impacts:

1. Define enhanced WLAN policies (considering 3GPP RAN + WLAN context)

2. Provide enhanced WLAN related information

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 6

doc.: IEEE 802.11-14/0154r0

Submission

backup

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 7

doc.: IEEE 802.11-14/0154r0

Submission

SA2/CT1WORM (Optimised offloading from cellular to WLAN)

• Solutions for optimized offloading of traffic to WLAN access when PS mobility between 3GPP RATs takes place.

• Now adding (Release 12):– Enabling an operator to prioritise specific 3GPP RAT’s (GERAN, UTRAN, LTE)

relative to WLAN for the purposes of traffic routing.

– Enabling service to be continued over WLAN where the service may not be available or degraded on the new 3GPP RAT.

• Possible WLAN impacts:– None expected.

January 2014

S. Rayment, Ericsson & S. McCann, BlackBerrySlide 8