1. MITMOT IEEE802.11n proposal summary
Month 2003
doc.: IEEE /xxxr0
MITMOT IEEE802.11n proposal summary
“Mac and mImo Techniques for MOre Throughput”
Authors:
Date:
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Patillon Motorola
H.Bonneville, B.Jechoux, Mitsubishi ITE

2. Authors, contd: Month 2003 doc.: IEEE 802.11-03/xxxr0
Patillon Motorola
H.Bonneville, B.Jechoux, Mitsubishi ITE

3. Overall goal and positioning
Preserve compatibility with legacy IEEE system
Evolution: expand current WLAN application domain, offer a consistent solution to
Provide required QoS to support consumer electronics (multimedia home environment and VoIP enterprise)
Grant range extension for limited outdoor operation (hotspot) as well as full home coverage
Support heterogeneous traffic: increase overall peak data rate without jeopardizing lower data rates modes
Manage diversity (laptop/PDA/VoIP Phone) and evolution (independent STA/AP antenna configuration upgrade) of devices through asymmetric antenna configurations
Proven and simple solution: combine a highly efficient contention-free based MAC with robust yet low complexity open-loop MIMO PHY techniques
Patillon Motorola

4. .11n MAC: an evolutionary approach
Month 2003
doc.: IEEE /xxxr0
.11n MAC: an evolutionary approach
Solutions:
Centralised on demand resource allocation with grouped resource announcements,
embedded in .11e superframe
providing contention free access for all type of .11n traffics
Aggregated PHY bursts made of short fixed size MAC-PDUs
allows 1 or multiple destinations and/or PHY modes
Enhanced ACK: low latency and low overhead selective retransmission
Benefits:
Actual QoS: guaranteed throughput, stringent delay constraints support
even in heavily loaded system
High efficiency and scalable architecture
scenario SS16 (point to point): 86% - extended SS6 (Hotspot): 67%
maintain constant overhead when data rate increases
Efficient for heterogeneous traffics (bursty, VBR, CBR, high or low data rates)
without parameter tuning
Easy implementation, low power consumption
summary deck
Patillon Motorola
H.Bonneville, B.Jechoux, Mitsubishi ITE

5. .11n PHY: a MIMO robust extension
Goal: define new OFDM MIMO modes with the constraints to
handle asymmetric TX/RX antenna configurations with 1, 2 or 3 parallel streams
focus on open-loop for stability, avoiding calibration circuit or feedback signaling
Solution: exploit a hybrid combination of
Spatial Division Multiplexing (SDM) to increase spectrum efficiency and peak data rates
classical Space Time Block Coding (STBC) to improve link robustness or range for low to medium data rates (suited to small packet size e.g. VoIP)
Additional key features:
mandatory: 20MHz bandwidth, minimum of 2Tx antennas (up to 4Tx)
new two stage space and frequency interleaver design
Forward Error Correction scheme:
supports all .11a CC rates, adds low redundancy 5/6 (mandatory)
advanced optional scheme: binary turbo code derived from 3GPP
second 20MHz/128 carriers OFDM modulation (8% rate increase), with double duration guard interval (Hotspot: limited outdoor)
optional high rate 40MHz bandwidth/128 carriers modes (117% rate gain)
new nPLCP preambles: code overlay STS/orthogonal LTS combined with CS
optional simple PAPR reduction method based on pilot tones rotation for low power
Patillon Motorola

6. Environment/Device/Appl target
Patillon Motorola

7. Differentiators
Capture wider range of environments/devices/applications:
(full) home/enterprise/limited outdoor, handhelds/laptops, from VoIP to multimedia streaming
Build in support for asymmetric TX/RX antenna configurations to accommodate various terminal sizes (PDA/Phone) offering a scalable and evolutionary solution
Hotspot support: dedicated 128 carrier with double length cyclic prefix OFDM modulation, longer range achieved through hybrid STBC robust and SDM high peak rates modes
.11n specific robust beacon enables materialization of new PHY mode range prediction
Enhanced QoS using “Extended Centralised Coordination Function”
Inherent clean split between legacy and .11n devices at MAC level
With no need for mixed-modes transmission mode definition
Resource allocation mechanism is highly dynamic
QoS provided without use of traffic profiles (TSPECS)
High Efficiency independent of application packet size through segmentation
Robustness to error through retransmission mechanism on segmented packets
Lower power operation:
PHY power saving: PAPR reduction based on simple pilot rotation
Enhanced transparency and predictability through broadcast grouped resource announcement
yields clean low power implementation and low overhead
New preamble definition: for simple&accurate AGC, time sync and easier quality/complexity tradeoff for CSI estimation
Improved link adaptation: efficient interoperability through calibration and support of accurate link quality metrics
Patillon Motorola