high efficiency wlan – 802 - kics.or.kr · wi-fi data traffic in smartphone is more than 2x of...

HIGH EFFICIENCY WLAN – 802.11AX

LG전자 차세대 통신 연구소 조한규 ([email protected])

• Needs 1. Market

• Needs 2. Technology/standards

• Scope

• Scenarios & Applications

• More on Simulation Scenarios

• Technologies

• Plan

Agenda

New Wi-Fi Device: about 5,000,000/day !!

Wi-Fi Market

Wi-Fi Chipset Shipments (millions of units)

source: ABI Research

Wi-Fi data traffic in smartphone is more than 2X of cellular

Wi-Fi Market

Android smartphone data traffic of major markets (Canada, Germany, Japan, South Korea, UK, US)

2012. 8 2013. 4

source: Mobidia, ’13

Wi-Fi, combined with small cells, will be contributing about 50% of additional capacity in 2018

Wi-Fi Market

New mobile data capacity gained from various techniques

source: Maravedis-Rethink operator survey

Various market segments require enhancement of average throughput and user experience in dense deployment scenarios [1]

Wi-Fi Market Drivers

Operators desire cellular offload to lighten traffic explosion •Annual global IP traffic will pass the Zetabyte threshold by end of 20161).

PC/Mobile/CE vendors desire higher user experience •100% Wi-Fi attach-rate for smart phones, which requires improved power-efficiency •Video traffic will be 55% of all consumer Internet traffic by 20161), which demands improved satisfaction of latency, jitter, and packet loss requirements of delay sensitive applications •Attach-rate for smart pad/TV/appliances is substantially increasing

Automotive is increasingly using Wi-Fi for in-car entertainment

Chip/AP vendors desire successive Wi-Fi market evolution after 11ac

Operator

Manufacturer

Chip/AP vendor

Need a standard to enhance

average throughput and user experience

in real world

>100X improvement of peak data rate in 10 years “Is still peak data rate enhancement pursued in HEW?”

WLAN Standards History

802.11g

802.11n

802.11ac

High Efficiency WLAN

‘00.09 ‘03.09

2008.09

2014.5

600Mbps

802.11ad

2008.12

2.4GHz

5GHz

60GHz

802.11a

‘97.09

54Mbps

1997 2003 2008 2014

6.9Gbps (11ac) 6.7Gbps (11ad)

???

Substantial performance enhancement mainly based on increase of channel BW and antenna (8X, 8X) “Which new/enhanced technologies will be adopted in HEW?”

WLAN Standards History

802.11a/g 802.11n 802.11ac High Efficiency WLAN

Transmission Method OFDM OFDM OFDM ?

Antenna Tech. SISO MIMO (Up to 4streams)

MU-MIMO (Up to 8 streams) ?

Channel Bandwidth 20MHz 20/40MHz 20/40/80/160M

Hz ?

MCS x x 256QAM (5/6) ?

?

• Very dense deployments

• Growing use of WLAN outdoors

• Better support of real-time applications

• Improved power efficiency

• Improved user experience

Need for the New Project

• Four times improvement in the average throughput per station in a dense deployment scenario – Throughput is measured at the MAC data service access point – Expected to provide improvements of 5 – 10x

• Improving power efficiency per station

• Indoor and outdoor operations in frequency bands between 1 GHz and 6 GHz

• Enabling backward compatibility and coexistence with legacy IEEE 802.11 devices operating in the same band

HEW PAR Scope

Main Scenarios

Public transportation

e-Education

Outdoor (Street)

Station Residential A

B

C

D

E

New and Enhanced Applications

• Cellular Offloading • Cloud Computing - including VDI (Virtual Desktop Infrastructure) • Display Sharing - 1-to-1 (Phone - TV), 1-to-many (classroom), Many

-to-1 (security) • Interactive Multimedia & Gaming • Progressive Streaming • Real-time Video Analytics & Augmented Reality • Support of wearable devices • Unified Communications - Including Video conferencing • User Generated Content (UGC) Upload & Sharing • Video conferencing/tele-presence • Video distribution at home – new video resolution (VHD, UHD) • Wireless docking • Wi-Fi geo-location services • Digital omni-view in a stadium: point-of-sight selective applications

Simulation Scenarios defined in HEW SG [5]

Scenario Name Topology Management Channel Model Homogeneity Traffic M

odel

1 Residential A - Apartment building

e.g. ~10m x 10m apartments in a multi-floor building

~10s of STAs/AP, P2P pairs Unmanaged Indoor Flat Home

2 Enterprise B - Dense small BSSs with clu

sters e.g. ~10-20m inter AP distance, ~100s of STAs/AP, P2P pairs

Managed Indoor Flat

Enterprise

3 Indoor Small BSS Hotspot

C - Dense small BSSs, uniform e.g. ~10-20m inter AP distance ~100s of STAs/AP, P2P pairs

Mobile

4 Outdoor Large BSS Hotspot

D - Large BSSs, uniform e.g. 100-200m inter AP distance ~100s of STAs/AP, P2P pairs

Managed

Outdoor

Flat Mobile

4a Outdoor Large B

SS Hotspot + Residential

D+A Managed + Unmanaged

Hierarchical Mobile + Home

Residential Scenario

• In each apartment, AP is placed in random xy-locations at z = 1.5 m above the floor level of the apartment

• In each apartment, 5 STAs are placed in random xy-locations at z = 1.5m above the floor level of the apartment

• Channel model: TGac channel B

• Primary channel: Random assignment of 3 non overlapping channels

• AP Tx power: 23dBm

• STA Tx power: 17dBm

Enterprise Scenario

• Office floor configuration 8 offices

64 cubicles per office

Each cubicle has 4 STAs

• 4 APs per office installed on the ceiling

• STAs are placed in random position within a cubicle (x,y,z=2)

• Channel model: TGac channel D

• Primary channel: mod(BSS_index,4)



Indoor Small BSS Scenario

• BSSs are placed in a regular and symmetric grid with 7 meter BSS radius (frequency reuse 3 configuration)

• AP is placed at the center of the BSS

• 30 STAs are placed randomly in a BSS

• Channel model: TGac channel D for AP-AP, AP-STA, TGac channel B for STA-STA

• Primary channel: same for all BSSs



BSS

BSS

BSS BSS

BSS BSS

BSS

BSS BSS

BSS

BSS

BSS

BSS

BSS

BSS

BSS

BSS

BSS BSS

Outdoor Large BSS Scenario

• Outdoor street deployment overlap of 3 operators

define a 19 hexagonal grid with ICD = 130 meters

• AP is placed at the center of the BSS

• 50 STAs are placed randomly in a BSS

• Channel model: UMi channel model

• Primary channel: same for all BSSs



• HEW will consider MAC and PHY technologies – To make more efficient use of spectrum resources in scenarios with a

high density of STAs per BSS.

– To significantly increase spectral frequency reuse and manage interference between neighboring overlapping BSS (OBSS) in scenarios with a high density of both STAs and BSSs.

– To increase robustness in outdoor propagation environments and uplink transmissions.

– To improve power efficiency per station

Technologies - Direction

• Spatial domain techniques, CCA control [8]

• Fully utilize resources in frequency domain [9]

Technologies – Discussed in HEW SG

Freq.

802.11a 802.11n

(40 MHz)

802.11ac (80 MHz)

802.11ac (160 MHz)

Freq.

802.11a 802.11n

(40 MHz)

802.11ac (80 MHz)

OFDMA Capable

STA

OFDMA Capable

STA

OFDMA Capable

STA OFDMA Capable

STA, or

802.11ac STA

(160 MHz)

Ch.1 Ch.2

Ch.3 Ch.4

Ch.5 Ch.6

Ch.7 Ch.8

Guard Band

Guard Band

Guard Band

UL MU-MIMO Interference management

Dynamic Sensitivity Control (DSC)

DL MU-MIMO (802.11ac)

Technologies – Discussed in HEW SG

Edge Throughput Enhancement

MAC Enhancements

MIMO/Beamforming

Multiplexing Schemes

Simultaneous Transmit and Receive

Overlapping BSS Handling

• HARQ • Larger CP

• Basic Access Mechanism enhancements • Dynamic Sensitivity Control • Traffic Prioritization, QoE • Multicast transmissions

• Massive MIMO, MIMO Precoding • DL/UL MU-MIMO • Beamforming for OBSS • Beamforming for Interference Handling

• OFDMA, SDMA, OFDM-IDMA, FFR • TD-uCSMA • Channel Bonding

• Interference management, Antenna pattern nulling

• Efficient resource utilization • Control frame transmission reduction

• MAC/PHY mechanisms for enabling In-Band STR • Enhancements for enabling out-Band STR

4 Years of project after 1 year of study group (‘14.5~’18.3)

Plan of 802.11ax

13 14 15 16 17 18

HEW

May May March

Study Group (SG) Task Group (TG)

• PAR (Project Authorization Request) [2] • CSD (Criteria for Standards Development) [3]

July

802.11 ax

SG Official Document:

Initial SB (Sponsor Ballot)

• Functional Requirements

• Channel Model/Simulation

Scenario/Evaluation Methodology

• Spec. Framework Document

• TGax Draft (TGax 0.1)

• Initial Letter Ballot (TGax 1.0)

TG Official Document (TBD):

•Channel Model [4] •Simulation Scenario [5] •Evaluation Methodology [6]

감사합니다.

조한규 ([email protected] )

mailto:[email protected]

high efficiency wlan – 802 - kics.or.kr · wi-fi data traffic in smartphone is more than 2x of...

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