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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)
• AP Tx power: 24dBm
• STA Tx power: 21dBm
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
• AP Tx power: 17dBm
• STA Tx power: 15dBm
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
• AP Tx power: 30dBm
• STA Tx power: 15dBm
• 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
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]