A New Metric for Evaluating the Throughput of HEW

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A New Metric for Evaluating the Throughput of HEW Month Year doc.: IEEE 802.11-13/xxxxr0 March 2014 A New Metric for Evaluating the Throughput of HEW Date: 2014-03-18 Authors: Yunzhou Li, Tsinghua Univ. Yunzhou, Tsinghua

Mar 2013 Background Yunzhou Li, Tsinghua Univ.

Inefficiencies of Current WLAN September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Inefficiencies of Current WLAN Assume all APs are blind, in other words, they know know nothing about STAs. Strategies Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Inefficiencies of Current WLAN September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Inefficiencies of Current WLAN Notorious Exposed Node Problem: Strategies Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Inefficiencies of Current WLAN September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Inefficiencies of Current WLAN MAC and PHY layers are blind to their upper layers. Traffic Properties Strategies Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

September 2013 HEW with Intelligence Yunzhou Li, Tsinghua Univ.

Acquire Prior Knowledge of STAs September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Acquire Prior Knowledge of STAs STAs 1) often stay at some places for a long time; 2) try to access or once connected to different APs Therefore: APs can learn some prior knowledge of STAs based on the previous measurements; adjust transmission modes to reach High Efficiency. Strategies Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Key Idea Besides the traditional per-BSS and per-STA throughput, We suggests a new metric named as throughput with learned knowledge. large-scale channel state information (CSI); positions of STAs relative to the APs; statistical properties of different kinds of traffics (e.g., video and voice); Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Large-scale CSI for Improving Efficiency September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Large-scale CSI for Improving Efficiency Full CSI are hard to be acquired by APs, because Channel is varying; Every AP can only estimate the CSIs of its own STAs. But, large-scale fading coefficients (i.e. large-scale CSI) can be obtained easily, because they could keep constant for a long time; STAs could have connected to different APs previously. Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Large-scale CSI for Improving Efficiency September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Large-scale CSI for Improving Efficiency . Power Allocation among APs based on Large-scale CSI Virtual MIMO in Multi-Cell Distributed Antenna Systems: Coordinated Transmissions with Large-Scale CSIT, JSAC 2013 Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Spatial Information for Improving Efficiency September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Spatial Information for Improving Efficiency Solving the Exposed Node Problem: Make AP1 and AP2 know the Spatial Positions of STA1 and STA2 Strategies Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Traffic Properties for Improving Efficiency September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Traffic Properties for Improving Efficiency Cross-layer Design. Traffic Properties (time sensitive or not, Error sensitive or not, etc.) Strategies Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

Traffic Properties for Improving Efficiency September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Traffic Properties for Improving Efficiency Similar as WiFox[1], StreamBoost[2], WLAN could be optimized based on the statistical characteristics of data-traffics. [1] http://www.slashgear.com/wifox-boosts-wifi-by-700-using-wireless-traffic-cop-15257159/ [2] http://ces.cnet.com/8301-34439_1-57561919/qualcomm-to-demo-first-streamboost-wi-fi-routers-at-ces-2013/ Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Proposal Evaluate the throughput of HEW under some important prior knowledge of STAs; IEEE 1588 & synchronization Coordinated frequency band Coordinated power and frequency band Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.

September 2012 doc.: IEEE 802.11-12/xxxxr0 March 2014 Summary Some prior knowledge of STAs could be useful for improving the efficiency of HEW. They can be learnt by APs when APs are communicating with STAs. Throughput of HEW should be re-evaluated under the prior knowledge of STAs. IEEE 1588 & synchronization Coordinated frequency band Coordinated power and frequency band Yunzhou Li, Tsinghua Univ. Yasuhiko Inoue (NTT), et. al.