Hervé Bonneville, Bruno Jechoux, Romain Rollet Month 2003 doc.: IEEE 802.11-03/xxxr0 MITMOT “Mac and mImo Techniques for MOre Throughput” alliance proposal presentation in response to IEEE802.11n CFP Hervé Bonneville, Bruno Jechoux, Romain Rollet Mitsubishi ITE 1, allee de Beaulieu, 35700 Rennes, France e-Mail: {bonneville,jechoux,rollet}@tcl.ite.mee.com Markus Muck, Marc de Courville, Jean-Noël Patillon, Stéphanie Rouquette-Léveil, Alexandre Ribeiro Dias, Karine Gosse, Brian Classon, Keith Blankenship Motorola Labs Parc les Algorithmes – Saint Aubin – 91193 Gif sur Yvette Cedex - France 1301 E. Algonquin Rd, Schaumburg, IL 60196, USA e-Mail: {muck,courvill,patillon}@crm.mot.com, Brian.Classon@motorola.com Jechoux,Patillon Mitsubishi/Motorola H.Bonneville, B.Jechoux, Mitsubishi ITE

Overall goal and positioning Preserve compatibility with legacy IEEE802.11 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 Jechoux,Patillon Mitsubishi/Motorola

.11n MAC: an evolutionary approach Month 2003 doc.: IEEE 802.11-03/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 Jechoux,Patillon Mitsubishi/Motorola H.Bonneville, B.Jechoux, Mitsubishi ITE

.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 signalling 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 Jechoux,Patillon Mitsubishi/Motorola

Differentiators Resource allocation mechanism is highly dynamic QoS provided without use of traffic profiles (TSPECS) Enhanced transparency and predictability through broadcast grouped resource announcement yields clean low power implementation and low overhead Inherent clean split between legacy and .11n devices at MAC level no need for mixed-modes transmission mode definition High Efficiency independent of application packet size through segmentation Robustness to error through retransmission mechanism on segmented packets .11n specific beacon enables materialization of new PHY mode range prediction Build in support for asymmetric TX/RX antenna configurations to accommodate various terminal sizes (PDA/Phone) offering a scalable and evolutionary solution New preamble definition: allowing simple yet accurate AGC, time synchronization and easier quality/complexity tradeoff for CSI estimation Open-loop link quality feedback for easier and better link adaptation Jechoux,Patillon Mitsubishi/Motorola