1. Submission doc.: IEEE 11-13/1398r0 Nov 2013 Akira Yamada, NTT DOCOMO, Inc.Slide 1 Requirements for HEW Date: 2013-11-14 Authors:

2. Submission doc.: IEEE 11-13/1398r0 Nov 2013 Akira Yamada, NTT DOCOMO, Inc.Slide 2 Abstract This presentation shows what mobile operator expects for HEW in a WLAN service. Note that this presentation includes some topics that are out of scope of standardization.

3. Submission doc.: IEEE 11-13/1398r0 WLAN Usage in Mobile Operators Slide 3Akira Yamada, NTT DOCOMO, Inc. Nov 2013 STA Mobility Peak Throughput LTE Macro Cells LTE Small Cells LTE Small Cells WLAN Hotspots HighLow High LTE macro cells cover large coverage with high mobility WLAN is used for higher throughput with lower mobility

4. Submission doc.: IEEE 11-13/1398r0 What mobile operators expect for HEW Tremendous traffic increase in mobile NW [1] Traffic offloading is one of the promising solution for mobile operators to reduce CAPEX/OPEX Make users to use WLAN more Enhancing of user experience is key factor Slide 4Akira Yamada, NTT DOCOMO, Inc. Nov 2013 Traffic Offloading Popularize WLAN UX Enhancement Requirements??

5. Submission doc.: IEEE 11-13/1398r0 Requirements Higher area throughput Efficient transmission required E.g. Congested train stations, center of down-town, etc… Simulation scenarios using real-environment is important E.g. OBSS, interference, etc… Further discussion needed about definition of “Area Throughput” E.g. bps/m 2 Smooth switching between AP-AP / WLAN - cellular Sticky client issue [2] when switching between APs is one of causes to interrupt packet flows due to lower MCS Same issue occurs when switching from WLAN to cellular Mechanisms to solve this issue is necessary Slide 5Akira Yamada, NTT DOCOMO, Inc. Nov 2013

6. Submission doc.: IEEE 11-13/1398r0 Requirements (Cont.) Not degrade area throughput of indoor BSSs by deploying outdoor large BSS Outdoor scenario is important especially in crowded areas for traffic offloading  e.g. downtown Tokyo, crowded train stations, etc... But, it is also important NOT to degrade area throughput of indoor BSS users by outdoor large BSS Slide 6Akira Yamada, NTT DOCOMO, Inc. Nov 2013

7. Submission doc.: IEEE 11-13/1398r0 Summary PAR should include following items: Improving area throughput Realizing smooth switching between AP-AP and Wi-Fi - Cellular Not degrading area throughput of indoor BSSs by deploying outdoor large BSS Slide 7Akira Yamada, NTT DOCOMO, Inc. Nov 2013

8. Submission doc.: IEEE 11-13/1398r0Nov 2013 Akira Yamada, NTT DOCOMO, Inc.Slide 8 References [1] “Cisco Visual Networking Index: Global Mobile Data Traffic Forecast Update, 2012–2017” [2] Reza Hedayat et al, “Some Simulation Scenarios for HEW” 802.11-13/1176r0