无线区域网路中自我相似交通流量之

無線區域網路中自我相似交通流量之

成因與效能評估

Theoriginandperformanceimpactofself-similartrafficforwirelesslocalareanetworks報告者：林文祺指導教授：柯開維博士OutlineBackgroundofSelf-SimilarityPropertiesofWLANTrafficEstimationofSelf-SimilarTrafficTheOriginofSelf-SimilarityinWLANImpactofSelf-SimilartoCSMA/CAperformanceImpactofSelf-SimilartoCSMA/CAperformancewithRTS/CTSBackgroundofSelf-Similarity(1/8)Self-SimilarityandFractalBackgroundofSelf-Similarity(2/8)StatisticsofSelf-SimilarityDefinitionofSelf-SimilarStochasticProcess:H:Hurstparameterorself-similarityparameterBackgroundofSelf-Similarity(3/8)Self-SimilarityofStatisticsDefinitionofSelf-SimilarStochasticSequence:Ex.BackgroundofSelf-Similarity(4/8)PropertiesofSelf-SimilarityLongrangedependenceSlowlydecayingvarianceHeavy-taileddistributionBackgroundofSelf-Similarity(5/8)Self-SimilarTrafficBackgroundofSelf-Similarity(6/8)

X(t)isaParetodistributionrandomprocesswithshapeparameterαandlocationparameterk.ParetoDistribution:BackgroundofSelf-Similarity(7/8)Variance-timePlot

R/SPlotBackgroundofSelf-Similarity(8/8)PropertiesofWLANTraffic(1/2)WLANtrafficTimeUnit=1SecTimeUnit=0.1SecTimeUnit=0.01SecBasic:1μSAggregation:1,0.1,0.01SecEnvironment:7NBPoissontrafficPropertiesofRealNetwork(2/2)

TimeUnit=0.01SecTimeUnit=0.1SecTimeUnit=1SecEstimationofSelf-SimilarTraffic(1/2)PacketsSequenceonWLANEstimationofSelf-SimilarTraffic(2/2)VariancePlot&R/SPlotSingleSourcewithoutCSMA/CATheOriginofSelf-SimilarTraffic(1/3)TheOriginofSelf-SimilarTraffic(2/3)VariancePlot&R/SPlotTheOriginofSelf-SimilarTraffic(3/3)VariancePlot&R/SPlotforWLANbasedonsinglePoissonTraffic.(Simulated)ImpactofSelf-SimilartoCSMA/CAperformance(1/7)MaximumthroughputTheinfluenceofnodesonSelf-SimilarTrafficandPoissonTrafficTheinfluenceofpacketlengthonSelf-SimilarTrafficandPoissonTrafficImpactofSelf-SimilartoCSMA/CAperformance(2/7)MaximumthroughputImpactofSelf-SimilartoCSMA/CAperformance(3/7)MaximumthroughputImpactofSelf-SimilartoCSMA/CAperformance(4/7)TheinfluenceofnodesonSelf-SimilarTrafficandPoissonTrafficImpactofSelf-SimilartoCSMA/CAperformance(5/7)TheinfluenceofnodesonSelf-SimilarTrafficandPoissonTrafficImpactofSelf-SimilartoCSMA/CAperformance(6/7)TheinfluenceofpacketlengthonSelf-SimilarTrafficandPoissonTrafficImpactofSelf-SimilartoCSMA/CAperformance(7/7)TheinfluenceofpacketlengthonSelf-SimilarTrafficandPoissionTrafficMaximumthroughputTheinfluenceofnodesonSelf-SimilarTrafficandPoissonTrafficTheinfluenceofpacketlengthonSelf-SimilarTrafficandPoissonTrafficImpactofSelf-SimilartoCSMA/CAperformancewithRTS/CTS(1/4)ImpactofSelf-SimilartoCSMA/CAperformancewithRTS/CTS(2/4)MaximumthroughputImpactofSelf-SimilartoCSMA/CAperformancewithRTS/CTS(3/4)TheinfluenceofnodesonSelf-SimilarTrafficandPoissonTrafficImpactofSelf-SimilartoCSMA/CAperformancewithRTS/CTS(4/4)TheinfluenceofpacketlengthonSelf-SimilarTrafficandPoissonTrafficConclusionWLANTrafficisSelf-Similarregular&Single)WLANThroughputatnode=5MaxWLANThroughputatnode<5Poisson>SSWLANThroughputatnode>5Poisson<SSImpactofPacketLengthRTS/CTSnotinfluencethecharacteristicofPoissonandSelf-SimilarityThanksforyourattendanceImpactofSelf-SimilartoCSMA/CAperformanceTheNumberofNodesincrementform1to5ImpactofSelf-SimilartoCSMA/CAperformanceTheNumberofNodesincrementform1to5谢谢观看/欢迎下载BYFAITHIMEANAVISIONOFGOODONECHERISHESANDTHEENTHUSIASMTHATPUSHESONETOSEEKITSFULFILLMENTREGARDLESSOFOBSTACLES.BYFAITHIBYFAITH最易遭老板“炒”的15种员工广东韦邦集团李双华有人在工作中出了问题，于是首先想到的是换一家企业去工作，考虑的只是换一个环境而已，根本没有反思自身的问题。可是，换了工作环境问题却依然存在啊！老板虽然换了，但他们考虑“炒鱿鱼”的因素是一致的。那么，老板眼中什么样的人会被炒掉呢？这类对象一般是刚刚参加工作不久的职场新鲜人，对突发事件往往措手不及，结果行动常过分急躁，更甚者每次遇事每次如此，给老板留下不可调教的印象。01：不够稳重沉着喜欢夸夸其谈，一旦需要实际操作时，往往发生许多困难，却又找不出原因何在。02：理论与实际不能配合不能具体地评断工作价值，往往分不清工作的目的是什么，是为了赚钱？还是为了立名？或是为了乐趣。给老板一种整个人浑浑噩噩的感觉。03：不够成熟一旦出现失误就无法释怀，更无法从中领悟出正确的方法。04：对所犯的错误耿耿于怀只看重眼前区区小事，无法透过现象去把握实质，没有主次之分，往往怡误很多机会。05：斤斤计较，分不清主次自信有很好的工作能力，但稍微涉及工作以外的其他方面，就极度缺乏自信心。06：过高评估自己的能力对工作匆忙做出决定，但朝令夕改，例如今天要求执行A计划，明天却又把B计划列为优先。07：考虑问题不够严谨、全面总是自己独立执行，不能与同事、领导融洽相处。08：与周围环境不能相融需要独自处理的事情，常常犹豫不决，不能当机立断而影响工作效率。09：遇事犹豫不决让你定时完成的工作，总是找借口拖后，不能按时保质完成，而且几次之后总不见改进。10：办事拖沓不守时自认为在某一方面有别人无法比拟的特长，便对其他任何人视而不见，一副“除我之外谁也不行”的态度。11：恃才傲物无论在什么人面前，都有一种自我贬低的倾向，做起事来畏畏缩缩，在领导面前更是觉得自己相形见绌。12：过分谦虚自认卑微工作中总是重复同一种方式，缺乏自我独立创造的能力，不能出新。13：缺乏创造力，因循守旧不能听取别人的建议，自以为是，对别