在蜂窝网中应用d2d通信技术的研究

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1、摘要最后为了验证本文提出的正交资源分配机制的有效性，给出一种复用模式方案，并通过仿真性能、信令开销等方面综合对比得出结论：本文提出的基于图着色的D2D正交资源分配机制在频谱利用率、系统能效、通信质量、信令开销以及引入D2D通信对蜂窝系统的影响等方面性能良好。关键词：D2D，资源分配，效用，图着色，功率控制IIABSTRACTABSTRACTNowadays,smartphones,tabletsandothermobileterminalshavebecomethenecessitiesofpeople'slife,andasa

2、resultthemobileuserdatatrafficincreasesrapidly.Howeverthebandwidthavailableformobilenetworksislimited.Inordertosolvethecontradictionbetweentheincrementofdatatrafficandlimitedspectrumresource,newmobilecommunicationtechnologiesneedtobedeveloped.OnePromisingmethodisappl

3、yingDevice-to-Device(D2D)communicationincellularnetworks,i.e.twogeographicallynearbydevicesareallowedtocommunicatewitheachotherdirectly,insteadoffollowingthetraditional"Equipment-BaseStation-Equipment"cellularcommunicationmode.Thispapermainlyresearchesthetechnologyof

4、applyingD2DcommunicationincellularnetworksandproposesanorthogonalD2Dresourceallocationmechanismbasedongraphcoloring.CellularnetworksallocatearesourcepoolforD2Dcommunicationwhichisorthogonaltocellularcommunication.Theresourcepoolisdividedintoseveralsub-bandsandeachsub

5、-bandcouldbereusedbymultipleD2Dpairs.Graphcoloringisusedtofinishreuseselection.Onthebasisofgraphcoloring,thispaperproposesaspecificresourceallocationmethodbasedonutility.Inthismethod,thebandwidthallocatedtoeachsub-bandisproportionaltothenumberofD2Dpairsthatusethesame

6、sub-band.Consideringthatoneofthemostimportantfeaturesisreducingpowerconsumption,powercontrolisperformedafterresourceallocation.Undertheproposedmechanism,therearethreepossiblerealizationschemesaccordingtodifferentforminggraphmethods:Received-power-basedscheme:Areceiv

7、edpowerthresholdispredefinedPrxbyBaseStation(BS).TheadjacencyoftwonodesingraphGisjudgedbyfollowingprocedure:D2Dtransmitsprobsignalfirstly;ifthereceivedipowerofD2Dislargerthan,BSbelievesthatD2DandD2DisjPrxijadjacent;otherwise,BSbelievesthatD2DandD2Disnotadjacent.ij

8、SIR-basedscheme:BSdefinesaSIRthresholdandassumesthatallD2DSIRpairsreusethesamefrequncyresourcesfirstly.ForacertanD2D,otherD2Dipair