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1、2013IEEE24thInternationalSymposiumonPersonal,IndoorandMobileRadioCommunications:MobileandWirelessNetworksOptimalUserAssociationBasedonTopologicalPotentialinHeterogeneousNetworksRuiHan,ChunyanFeng,HailunXiaBeijingKeyLaboratoryofNetworkSystemArchitectureandConvergenceBeijingUnive
2、rsityofPostsandTelecommunications,Beijing,Chinahenry.006@163.com,{cyfeng,xiahailun}@bupt.edu.cnAbstract—Intraditionalcellularnetworks,UserEquipmentsTodealwiththisdrawback,manyeffortshavebeenmade(UEs)alwaysconnecttothestrongestBaseStation(BS),whichintheliterature.In[4],anetworkw
3、ideproportionalfairnessofferseitherthemaximumSignaltoInterferencePlusNoisecellselectionisproposedtoincreasethecelledgeUEs’Ratio(SINR)orthebestReferenceSignalReceivedPowerperformance.ThesumrateofallUEsisconsideredin[5],and(RSRP).However,inheterogeneousnetworks,duetoalargeeachUEi
4、sassignedtoanodethatcanmaximizetheoveralldifferenceoftransmitpowerbetweenmacrocellsandlowpowersumrate.Cellassociationandresourceallocationarenodes,theuserassociationmethodsmentionedabovemayleadtoconsideredjointlyin[6],andthelocationofUEsandBSsareunbalanceofuserdistributionbetwe
5、enthetwokindsofBSs.ThemodeledasPoissonPointProcess(PPP).Rangeexpansiongoalofourresearchistobalancetheuserassociationbetweenmethodhasbeenproposedwithin3GPP[7],whichapositivemacrocellsandpicocellswhilemaintainthenetworkbiasingisaddedtothedownlink(DL)receivedsignalstrengthperforma
6、nce.Wesolvetheuserassociationproblemby(RSS)ofpicocellpilotsignaltoexpanditsseveringarea.introducingthetopologicalpotentialbetweenUEsandBSs,fromwhichboththechannelconditionandthenumberofseveringInthispaper,weproposeanoptimaluserassociationUEsineachcellareconsidered.Sincemaximizi
7、ngthetopologicalalgorithmforthedownlinkofco-channelpicocells.Ourpotentialinnetwork-wideisNP-hard,aheuristicmethodisobjectiveistobalancethenumberofseveringusersbetweenproposedtoreachasuboptimal.Finally,thetradeoffbetweenmacroBSsandpicoBSswhilemaintainthenetworkassociationfairnes
8、sandnetworkthroughputisdiscussedviaperformance.Theprob
