宽带无线接入系统相关QoS的研究

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1、北京邮电大学博士学位论文宽带无线接入系统相关QoS的研究姓名：徐雅静申请学位级别：博士专业：电路与系统指导教师：徐惠民20070520北京邮电大学博十学位论文影响，提出了一种寻找总干扰流量最小的路由算法，并结合路由树给出了一种冲突避免调度的方法。由于干扰流量的影响可以控制，系统的容量可以明显提高。仿真结果表明了算法的有效性。关键词：无线局域网、动态频率选择、传输功率控制、无线城域网、带宽调度、流量预测n北京邮电丈学博士学位论文ABSTRA(了WiththedevelopmentofWirelessCommunications，BroadWirelessAccess

2、system，suchasWLANandWiMAX，takesonbroadapplicationprospectsgraduallyinHigh—speedInternetaccessandallkindsofdata，voiceandmultimediatraffics．Inthispaperwediscussedhowtoimprovecapacity，decreasedelayandensureQoSofdata、real—timetrafficinWLANandWiMAX．Wegetthefollowingachievements．1．Researcho

3、nSelf-InterferenceinadenseM。ANWestudiedthemechanism，reasonandimpactofSelf-InterferenceindenseWLANindetail．Duetocontradictionsbetweenfrequencyresourcesandcapacity,adiversedynamicfrequencyselect(DFS)indenseWq_ANisproposed．Thisalgorithmcanadjustfrequencyofadjacentchanneldynamicallybyreal

4、-timemonitor,inordertodecreasetheSelf-Interferenceandenhancethethroughput．Inaddition，basedontherelationshipbetweentopologyandSelf-interference，anewtransmissionpowercontrol(TPC)indenseWI．2LNisproposed．ByadjustingtransmissionpowerofBSdynamicallythisalgorithmcandecreasetheSelf-Interferen

5、ceandenhancethethroughput．Simulationresultsshowtheeffectivenessofthetwoproposedalgorithms．2．ResearchonQoSofreal—timetraffiCinWiM．AXm北京邮电人学博，Ij学位论文WiMAXsupportsQoSofdiff-service．Becausereal—timetrafficisdelaysensitive，anoveladaptivebandwidthrequestmechanismforreal-timetrafficinWiMAXisp

6、roposed．Basedontrafficprediction，thisalgorithmcanrequestextrabandwidthforpacketscomingnexttimeinadvance．Simulationresultsshowthattheproposedadaptivealgorithmcanprovidebetterperformanceofaveragedelayandbuffer．3．ResearchonbandwidthschedulinginWiMAXMeshnetworkWehavestudiedtheimpactofinte

7、rferencetrafficontransmissionperformanceinIEEE802．16Meshnetwork．Anewroutingalgorithmbasedonminimuminterferencetrafficisproposed．Basedontheroutingtreeacorrespondingcollision-freeschedulingprocedureisdiscussed．Becausetheimpactofinterferencetrafficcanbecontrolledeffectively,thesystemthro

8、ughpu