自適應(yīng)PI速率控制器在無線網(wǎng)絡(luò)環(huán)境下的實(shí)現(xiàn)及研究.pdf

1、天津大學(xué)碩士學(xué)位論文自適應(yīng)PI速率控制器在無線網(wǎng)絡(luò)環(huán)境下的實(shí)現(xiàn)及研究姓名：王寰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)系統(tǒng)結(jié)構(gòu)指導(dǎo)教師：趙政20070601ABSTRACTAlongwithrapiddevelopmentofnetworktechniquesandmobilecommunicationtechniques，thedemandforhighwirelessdataserviceperformanceisincreasingThem

2、ostpopularnetworkprotocoltodayisTCPwhichisempirical，senderbased，pointtopointandbursty，andassumesthatpacketlossesmeancongestion，andthatiswhatmakesitworkinmanycontextsHowever，inawirelessnetwork，packetlossescanbecausednoton

3、lybynetworkcongestionbutalsobyunreliableerrorpronewirelesslinks，SOTCPisnotsuitabletowirelessnetworktosomeextentsSelftuneProportional—IntegralRateControlProtocol(PIRCP)isanExplicitCongestionNotificationmethodwhichcomprise

4、stransmitting，atasourcenode，datapacketstoadestinationnode，viaintermediatenodes；withalladvertisedspeeddeterminingbyusingtheinstantaneousdeviationofthequeuelengthfromitstargetoccupancyattheintermediatenodes，ifanincipientco

5、ngestionisencountered，ietheintantanousqueuelengthissignificantlylongthanitshoped，calculatingtheadvertisedsourcetransmissionrateandaskingthesourcenodestoslowdowntheirsendingratetOtheveryvalue，andviseversa，alternativelyift

6、hepacketlosshappens，nomatterduetOwhatreasons，retransmittingthelostpacketstothedestinationnodeInthispaper，PIRCPisimplementedandtheresultsofexperimentalstudyofthisprotocolundertheenvironmentofwirelessnetworkispresentedWefi

7、rstimple—mentedPIRCPintheLinuxkernelbyusingkernelmoduletoavoidrewrittingcodesinthekernel，whichwouldbringUSunimaginablelargeworkload，andaftersolvingvarioussystemissues，suchasdatastructureOfPIRCPthewaytogetdatapackets，mutu

8、alexclusion，theusingoftimermemeryallocationandSO0n，thePIRCPimplimentamtionwasrunningonthetestbedwebuilttovalidatetheoreticaldeductionsandpreviouslyreportedsimulationresults，drawingaconclutionthatPIRCPcanbesuperiortoTCPNe

9、wReno，thedefaultnetworkprotocolinLinuxkernel26x，undertheenvironmentwithhighlossrateandveryunstablesystematicparameterattheaspectsofqueuelengthinthebufferofrouterthroughput，faimess，robustness，stabilityandconvergencyStill，