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1、中國(guó)科學(xué)技術(shù)大學(xué)碩士學(xué)位論文中繼網(wǎng)絡(luò)中的負(fù)載均衡研究姓名：余林洪申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：周武腸2011-05AbstractABSTRACTTherelaynetworkeffectivelymitigatestheproblemthattraditionalcellularnetworkscannolongermeetthepeople'srequirementofhigherdatatransmissionrate.Relaynodesinthenetworksdividealongertransmissionpa
2、thintosomeshorterpathswithbettertransmissionqualityanditcanincreasethesystemcapacity.Placingarelaynodeinthelocationwhereabasestationcan'tbesetconvenientlycanextendthecoverageareaofthesystem.Althoughrelaynetworkshavehighersystemcapacityandlargercoveragearea,duetotheuncertain
3、tyofpeople'smovement,therearestillsomehotcellsbeingoverloadedandmanynewcallsareblocked.Butinthesurroundingcells,theremaybemuchunusedresourcebecauseoflackingusers.Theproblemofloadimbalanceisstillseriousinrelaynetworks.Howtoutilizeloadbalancingstrategiestosolvethisproblemhasb
4、eenahotpointofresearch?Wealsoresearchtheloadbalancingstrategyinrelaynetworks.Wefirstlystudyloadbalancinginrelaynetworkswithmultipletraffictypesinthispaper?Wegiveamodelofloadbalancing,andformulateitasanoptimizationproblemwiththegoalofmaximizingthepercentageofsuccessfullyacce
5、ssedusers.Wegiveafive-steploadbalancingstrategytosolveit.Becausethedatarateofnon-real-timetrafficisvariable,wealsodynamicallycontroltherelationshipsofusers,relaysandbasestationstotransfertrafficfromhotcellstocooleronesanddecreasetheallocatedsub-channelsofuserswithnon-real-t
6、imetraffictoallowmoreuserstoaccessthenetwork.Itreducestheblockingprobabilityofusers.Inordertoensuretheperformanceofreal-timeusers,wegiveprioritytothem..Wealsostudyloadbalancingthatconsiderstheperformanceofusersmovingfromcelltocell.Indealingwithusers9callrequests,wefullycons
7、iderthedifferenceofnewcallsandhandovercalls,andgivealoadbalancingstrategythathandovercallshavehigherpriority.Inthisstrategy,wesetdifferentaccessthresholdfornewcallsandhandovercalls,andthenewcallshavehigherthreshold.Itmeansthatwesetsomeguardchannelsforhandovercalls,anditensu
8、reshandovercallshavemoreavailablechannels.Atthesametime,thedirectandindirectloadba
