WiFi 6 – 80.
802.11ax
Jagadeesh Gowda, Anton Skårbratt
Presentation title, Full name, Security Class: Proprietary
YYYY.MM.DD
Overview
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Improvements to both 2.4 GHz and 5GHz
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Outside usage
- Smallest BW now 2 MHz (longer range)
- Guard interval increase
- Dual carrier modulation
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Higher data rate
- Up to 1024 QAM modulation (+35%)
•
More clients efficiently and better QoS
- OFDMA
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Flexible power save for IoT
- Target-Wakeup Time
•
Spatial Reuse and interference mitigation
- BSS Coloring
- OBSS packet detection
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Presentation title, Full name, Security Class: Proprietary
2
Volvo IHU drivers
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Having combo chip supporting Bluetooth 5.1
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Having dual mac support
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Increased throughput
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Increased co-existence performance
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
3
Higher modulation order
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1024 QAM -> +25% throughput in single spatial stream
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Dense constellation points require great EVM
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Channel condition and link budget important
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MCS 8-11 support is optional (256-1024 QAM)
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
4
Guard intervals and symbol lengths
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Longer guard intervals and 3 options
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802.11ax symbol length 4x longer
(since subcarrier spacing reduced 4x)
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Several OFDM symbol lengths for Long Training Field
(to have option for reduced overhead)
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
5
OFDMA
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Introducing frequency as a dimension to split users (similar to LTE)
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More concurrent users with less latency
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Better QoS (don’t have to wait)
•
Better performance in frequency selective channels
Previous WiFi
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Presentation title, Full name, Security Class: Proprietary
OFDMA
6
Multi-user MIMO
Using concepts of spatial diversity and beamforming it is possible
to support simultaneous transmission from AP to no of clients
Sounding-beamforming explicit feedback
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Presentation title, Full name, Security Class: Proprietary
7
DL MU-MIMO
No signalling/No Trigger required
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
Multi-TID A-MPDU
8
UL MU-MIMO
Signalling/Triggering required
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
9
Power save
TWT (Target Wake Time)
Individual TWT
Broadcast TWT
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
10
Power save - contd
20 MHz channel only – IOT sensors
Operate on 2.4/5GHz with 20MHz at a
time
Only applicable to clients
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
11
Spatial re-use with color codes
BSS-Coloring:: To distingwish Same BSS and Distant BSS using two power
thresholds (CSMA/CA)
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
12
Spatial Re-use with NAV
Timer to predict future traffic
Acts as a Virtual carrier sense to reserve medium
Additional NAV (two-NAVs) to indicate time, immediately
after current frame
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
13
Chipset feature support
YYYY.MM.DD
Presentation title, Full name, Security Class: Proprietary
Main feature
Marvell Support
Qualcomm Support
256/1024 QAM
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DL-MUMIMO Tx
X
not validated
DL-MUMIMO Rx
√
√
DL-OFDMA Tx
X
√
DL-OFDMA Rx
√
√
UL-OFDMA Rx
X
√
UL-OFDMA Tx
√
√
UL-MUMIMO Rx
X
??
UL-MUMIMO Tx
√
√
1x HE-LTF
√
√
2x/4x HE-LTF
√
√
Extended Range (ER)
√
√
DCM
√
√
Aggressive Packet Extension
√
√
Beam Change
√
√
Spatial Reuse
√
√
Explicit SU Beamformer
√
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Explicit SU Beamformee
√
√
14