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Doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 1 A Metrics and Methodology Starting Point for TGT Date: Sept.

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Presentation on theme: "Doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 1 A Metrics and Methodology Starting Point for TGT Date: Sept."— Presentation transcript:

1 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 1 A Metrics and Methodology Starting Point for TGT Date: Sept 16, 2004 Authors: Charles R. Wright, Azimuth Systems, Inc., Acton, MA charles_wright@azimuthsystems.com Mike Goettemoeller, Texas Instruments, Santa Rosa goette@ti.com Shravan Surineni, Qualcomm, Concord, MA shravans@qualcomm.com Areg Alimian, CMC, Santa Barbara, MA aalimian@cmc.com

2 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 2 Abstract A starting point for the metrics and test methodology for TGT is presented

3 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 3 Outline Needs of the TGT users Test environments The metrics Relationship of metrics to application performance

4 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 4 Needs of TGT users TGT should enable TGT users to analyze performance of their wireless devices and systems when specific network applications being run over them –Data, streaming multimedia, VoIP TGT users need repeatable measurements

5 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 5 Test Environments The block diagrams to follow are very generic and represent a starting point for discussion It may not be obvious what each block means –Will explain after the block diagrams The blocks are functional and does not mean that they must exist as separate equipment Some of the blocks may not currently exist

6 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 6 Radiated Environment With Multipath Anechoic Chamber 802.11 Device Bidirectional Multipath Simulator DUT Adjacent Channel Intereferer V.A. = RF signal path Traffic Generator & Analyzer Ethernet

7 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 7 Radiated Environment, No Multipath = RF signal path Anechoic Chamber 802.11 Device DUT Adjacent Channel Intereferer V.A. Traffic Generator & Analyzer Ethernet

8 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 8 Conducted Environment With Multipath Bidirectional Multipath Simulator DUT Adjacent Channel Intereferer V.A. = RF signal path 802.11 Device Traffic Generator & Analyzer Ethernet

9 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 9 Conducted Environment, no Multipath = RF signal path DUT Adjacent Channel Intereferer V.A. 802.11 Device Traffic Generator & Analyzer Ethernet

10 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 10 Open Air Environment DUT Ethernet The open air environment does not guarantee repeatable reasults, but is seen as a useful environment for some tests 802.11 Device Traffic Generator & Analyzer

11 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 11 A Starting List of Metrics Layer 2 metrics –Maximum forwarding rate, FRMOL –MSDU loss rate –Delay –Jitter PHY layer metrics –MPDU loss rate Rate vs. range –Needs to be fully defined Adjacent channel, next adjacent channel interference –Needs to be fully defined Device level –Antenna pattern More… –AP performance metrics –Transition time (roaming) metrics –More…

12 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 12 Relationship of link layer metrics to application performance Application performance can be predicted using link layer metrics –Models exist for VoIP (ITU G.107), data –Analogous models are being developed for video in the ITU A very limited set of standard applications (ie, non vendor-specific) may need to be measured directly –Case in point: FTP –Might mean we add another metric: data throughput Definition to be agreed on in the group –Recognizes importance of real (not estimated) performance for this application metric

13 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 13 Relationship of PHY layer and device metrics to user experience Receiver sensitivity combined with antenna pattern determines range, given no interference –For a given channel condition and transmitter power –Defining the methodology for measuring Rx sensitivity and antenna pattern is work the group must take on Adjacent (next adjacent) channel interference characteristics also impacts range and usability –This deserves a lot of discussion because it can significantly impact user experience –The group must take this work on

14 doc.: IEEE 802.11-00/1131r1 Submission September 2004 Charles Wright, Azimuth SystemsSlide 14 Conclusions A starting list of metrics and test environments is presented Many more details are needed and much discussion about each item is warranted –This is the job of the Task Group If there is good agreement on this beginning, we can run with it

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