NIST model output Date: Authors: May 2010 Month Year

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Presentation transcript:

NIST model output Date: 2010-05-17 Authors: May 2010 Month Year doc.: IEEE 802.11-10/0204r3 May 2010 NIST model output Date: 2010-05-17 Authors: David Halasz, Aclara David Halasz, Aclara

Month Year doc.: IEEE 802.11-10/0204r3 May 2010 Abstract This submission describes some of the output provided by the NIST model. David Halasz, Aclara David Halasz, Aclara

May 2010 NIST model Tools provided by NIST and used in presentation PAP2modeling.ppt nist_80211_mac.m: Matlab code for 80211_MAC_Model nist_80211_MAC_readme.pdf: Readme file for using the 802.11 model Matlab code SNRcdf.m: Matlab code for computing SNR probability at wireless receiver SNRcdfCell.m: Matlab code for coverage analysis nist_phy_model_readme.pdf: Readme file for using Matlab code for SNRcdf and SNRcdfCell nist_channel_propagation_models.pdf: Channel propagation models David Halasz, Aclara

nist_80211_MAC_readme.pdf, Figure 2 May 2010 nist_80211_MAC_readme.pdf, Figure 2 As load is increased, the mean packet delay increases until reach the saturation point. David Halasz, Aclara

nist_80211_MAC_readme.pdf, Figure 3 May 2010 nist_80211_MAC_readme.pdf, Figure 3 Provided didn’t drop packet in queue and didn’t reach max retries then reliable. Once reach saturation point, retries and delays cause packets to be dropped. David Halasz, Aclara

nist_80211_MAC_readme.pdf, Figure 4 May 2010 nist_80211_MAC_readme.pdf, Figure 4 Average throughput of entire wireless medium. From Figure 2, once saturation point is reached the mean packet delay increases dramatically. However at least one station is capable of transmitting and keeps the average throughput up. David Halasz, Aclara

nist_80211_MAC_readme.pdf, Figure 6 May 2010 nist_80211_MAC_readme.pdf, Figure 6 Throughput perceived by a single device. Once reach saturation point, impact of mean packet delay causes throughput to drop close to zero. Note: Correction will be available in next version of model. David Halasz, Aclara

May 2010 Suggestion Unidirectional traffic more concerned with average throughput. Transactional traffic, such as TCP/IP, more concerned with instantaneous throughput. David Halasz, Aclara