Submission

doc.: IEEE 11-13/1398r0Nov 2013

Akira Yamada, NTT DOCOMO, Inc.Slide 1

Requirements for HEW

Date: 2013-11-14

Name Affiliations Address Phone email Akira Yamada NTT

DOCOMO, Inc 3-6, Hikari-no-oka, Yokosuka, Kanagawa 239-8536, Japan

+81-46-840-3759

yamadaakira@nttdocomo.com

Yasuhiko Inoue

NTT 1-1 Hikari-no-oka, Yokosuka, Kanagawa 239-0847 Japan

+81-46-859-5097

inoue.yasuhiko@lab.ntt.co.jp

Yusuke Asai +81-46-859-3494

asai.yusuke@lab.ntt.co.jp

Yasushi Takatori +81-46-859-3135

takatori.yasushi@lab.ntt.co.jp

Akira Kishida +81-46-859-3254

kishida.akira@lab.ntt.co.jp

Koichi Ishihara +81-46-859-4233

ishihara.koichi@lab.ntt.co.jp

Fujio Watanabe DOCOMO Innovations, Inc.

3240 Hillview Ave, Palo Alto, CA 94034

+1-650-496-4726

watanabe@docomoinnovations.com

Moo Ryong Jeong

+1-650-496-4761

jeong@docomoinnovations.com

Authors:

Submission

doc.: IEEE 11-13/1398r0Nov 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.

Submission

doc.: IEEE 11-13/1398r0

Akira Yamada, NTT DOCOMO, Inc.

WLAN Usage in Mobile Operators

Slide 3

Nov 2013

STA Mobility

Pea

k T

hrou

ghpu

t

LTE Macro Cells

LTE Small Cells

WLAN Hotspots

HighLow

Low

High

• LTE macro cells cover large coverage with high mobility• WLAN is used for higher throughput with lower mobility

Submission

doc.: IEEE 11-13/1398r0

Akira Yamada, NTT DOCOMO, Inc.

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 4

Nov 2013

TrafficOffloading

PopularizeWLAN

UX Enhancement

Requirements??

Submission

doc.: IEEE 11-13/1398r0

Akira Yamada, NTT DOCOMO, Inc.

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/m2

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 5

Nov 2013

Submission

doc.: IEEE 11-13/1398r0

Akira Yamada, NTT DOCOMO, Inc.

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 6

Nov 2013

Submission

doc.: IEEE 11-13/1398r0

Akira Yamada, NTT DOCOMO, Inc.

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 7

Nov 2013

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