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ID:45763748
大小:169.90 KB
页数:76页
时间:2019-11-17
《中继网络中的负载均衡研究》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、中国科学技术大学硕士学位论文中继网络中的负载均衡研究姓名:余林洪申请学位级别:硕士专业:通信与信息系统指导教师:周武肠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
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