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1、 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:1 HANDOVER PROCESS切换过程切换过程BSSPAR S9 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:2 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程ContentsContents内容内容内容内容1.Overview概述概述2.Handover Decision切换判决切换判决3.Target Cell Selection目标小
2、区选择目标小区选择4.Algorithms 算法算法5.Power Budget Handover功率预算切换功率预算切换6.Level&Quality Handover电平电平&质量切换质量切换7.Umbrella Handover伞切换伞切换8.Timers for Handovers 切换记时器切换记时器 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:3 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程What is the purpose of HO?切换的目的是
3、什么切换的目的是什么?Call continuity 呼叫连续性呼叫连续性Call quality 呼叫质量呼叫质量Others.其它其它 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:4 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程CausesCauses原因原因原因原因Timing AdvanceAdjacent CellsDownlink QualityUplink QualityAV_RXQUAL_UL_HOAV_RXQUAL_DL_HODownlink Le
4、velUplink LevelAV_RXLEV_UL_HOAV_RXLEV_DL_HOAV_RANGE_HOAV_RXLEV_NCELL(n)QUALITY&INTERFERENCELEVELDISTANCEPERIODICCHECKSUMBRELLAPOWER BUDGETIMPERATIVE HOCHANNEL ADMINISTRATIONDIRECTED RETRYTHRESHOLD COMPARISONRAPID FIELD DROPOthers其它:Intelligent Underlay Overlay智能层叠覆盖Traffic Reason话务量原因.MS SPEEDMS Spe
5、edAV_MS_SPEED NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:5 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Handover DecisionHandover Decision切换判决切换判决切换判决切换判决 Handover process may be triggered by 切换过程可以由以下因素触发切换过程可以由以下因素触发:Quality,field strength or distance values fall below/exceed
6、their threshold质量质量,场强或者距离值低于场强或者距离值低于/超过门限超过门限 Periodic checks周期性检查周期性检查Power budget HO 功率预算切换功率预算切换Umbrella HO 伞型切换伞型切换 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:6 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Handover PriorityHandover Priority切换优先级切换优先级切换优先级切换优先级 Handover pri
7、ority切换优先级切换优先级1.Uplink and downlink Interference上行和下行干扰上行和下行干扰2.Uplink quality上行质量上行质量3.Downlink quality下行质量下行质量4.Uplink level 上行电平上行电平5.Downlink level 下行电平下行电平6.Distance 距离距离7.Rapid Field Drop 快速场强衰落快速场强衰落8.Slow moving MS 慢速移动手机慢速移动手机9.Better cell i.e.Periodic check(Power Budget HO or Umbrella HO)
8、更好小区更好小区,例如例如:周期性检查周期性检查(功率预算切换或者伞型切换功率预算切换或者伞型切换)10.PC:Lower quality/level thresholds(UL/DL)质量质量/电平下限电平下限(上行上行/下行下行)11.PC:Upper quality/level thresholds(UL/DL)质量质量/电平上限电平上限(上行上行/下行下行)NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:7 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Hando
9、ver AlgorithmsHandover Algorithms切换算法切换算法切换算法切换算法AV_RXLEV_NCELL(n)hoLevelUmbrella(n)PBGT hoMarginPBGT(n)wherePBGT=(msTxPwrMax-msTxPwrMax(n)-(AV_RXLEV_DL_HO-AV_RXLEV_NCELL(n)-(btsTxPwrMax-BTS_TXPWR)AV_RXLEV_NCELL(n)rxLevMinCell(n)+Max(0,A)A=msTxPwrMax(n)-P P=depending on MS Classmark取决于手机取决于手机Classma
10、rk PBGT hoMarginLev/Qual(n)where PBGT=(AV_RXLEV_NCELL(n)-AV_RXLEV_DL_HO)-(btsTxPwrMax-BTS_TXPWR)1.2.1.In all Handover cases(in imperative HO only requirement)在所有切换中在所有切换中(紧急切换的话是唯一的条件紧急切换的话是唯一的条件)Except for Umbrella Handover 伞型切换例外伞型切换例外2.The additional condition 附加条件附加条件If enableHoMarginLevQual=Y N
11、OKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:8 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Target Cell Selection(1)Target Cell Selection(1)目标小区选择目标小区选择目标小区选择目标小区选择If two or more Adjacent cells with equal priorities-Ranking based on radio properties如果两个或者更多邻区具有相同优先级如果两个或者更多邻区具有相同优先
12、级 基于无线特性排队基于无线特性排队Load check of Candidates by btsLoadThreshold (0.100%)候选小区的负荷检查候选小区的负荷检查If overloaded priority decreased by hoLoadFactor(0.7)如果超负荷如果超负荷,则降低优先级则降低优先级Best candidates to RR Management无线资源管理的最佳候选小区无线资源管理的最佳候选小区:intra BSC HO max 16 cells under the same BSC as the source cell同同BSC切换时一个切换时
13、一个BSC下最多有下最多有16个小区作为目标小区个小区作为目标小区inter BSC HO BSC之间切换之间切换numberOfPreferredCells Comparison of priorities of Candidates(hoLevelPriority(0.7)候选小区优先级比较候选小区优先级比较1.2.3.Only for Adjacent Cell of the same BSC NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:9 HANDOVER PROCESSHANDOVER PROCESS切换过
14、程切换过程切换过程切换过程Target Cell Selection(2)Target Cell Selection(2)目标小区选择目标小区选择目标小区选择目标小区选择 All cells have equal priority 具有相同优先级的所有小区具有相同优先级的所有小区cellabc Rx_Level-75-80-831.Loadoverl.overl.n.overl.hoLoadFactor1112.Priority333 New Priority2233.Rx_Level-75-80 =cell list c,a,b One cell has higher priority be
15、cause of some reason一个小区因为某种原因而具有更高优先级一个小区因为某种原因而具有更高优先级 cellabc Rx_Level-75-80-831.Loadn./overl.n.overl.n.overl.hoLoadFactor2112.Priority433 New Priority 4/2333.Rx_Level-75-80/-80-83=cell list a,b,c(if cell a is not overload)=cell list b,c,a NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning p
16、age:10 PBGT=(msTxPwrMax-msTxPwrMax(n)-(AV_RXLEV_DL_HO-AV_RXLEV_NCELL(n)-(btsTxPwrMax-BTS_TXPWR)PBGT=(33dBm-33dBm)-(-90-80)-(42dBm-42dBm)=10 dB 10 dB 6 dB OK!AV_RXLEV_NCELL(n)rxLevMinCell(n)+Max(0,msTxPwrMax(n)-msTxPwrMax)-80 dBm -99 dBm+(33 dBm-33 dBm)=-99 dBm1.2.Equations 1 and 2 are used 使用方程使用方程1
17、和和2AV_RXLEV_DL_HO=-90 dBmmsTxPwrMax=33 dBm(=2W)btsTxPwrMax=42 dBm(=16 W)BTS_TX_PWR=42 dBm=(16 W)hoMarginPBGT(n)=6 dBServing Cell服务小区服务小区:Best Adjacent Cell最佳相邻小区最佳相邻小区:AV_RXLEV_NCELL(n)=-80 dBmrxLevMinCell(n)=-99 dBmmsTxPwrMax(n)=33 dBm(=2W)btsTxPwrMax=42 dBm(=16 W)HANDOVER PROCESSHANDOVER PROCESS切换
18、过程切换过程切换过程切换过程Power Budget Handover(1)Power Budget Handover(1)功率预算切换功率预算切换功率预算切换功率预算切换 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:11 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Power Budget Handover Power Budget Handover 功率预算切换功率预算切换功率预算切换功率预算切换(2)(2)Trigger 触发Periodic Check周期性
19、检查 (hoPeriodPBGT)Candidate Selection 候选小区选择Equation 1&2 used 使用方程1和2Priority and Load Considered 考虑优先级和负载Typically used between cells of the same“Layer“用于同层的不同小区之间hoPeriodPBGT1.63(SACCH Period)enablePwrBudgetHandoverY/NParameterValuerxLevMinCell(n)-110 -47 dBmmsTxPwrMax(n)5 43 dBmhoMarginPBGT(n)-24
20、24 dB NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:12 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Handover due to Level(1/2)Handover due to Level(1/2)由于电平的切换由于电平的切换由于电平的切换由于电平的切换Trigger 触发Threshold Comparison 门限比较(hoThresholdsLevUL/DL(px-nx)Candidate Selection 侯选小区选择Equation 1 us
21、ed 使用方程1Equation 2 used if enableHoMarginLevQual=N 使用方程2Equation 2 with hoMarginLev used if enableHoMarginLevQual=YPriority and Load Considered 考虑优先级和负载hoThresholdLevUL/DL-110 -47px1 32nx1 32ParameterValuerxLevMinCell(n)-110 -47 dBmmsTxPwrMax(n)5 43 dBmhoMarginLev(n)-24 24 dB NOKIABSSPAR FOR S9/03.0
22、4.2000/Cellular Network Planning page:13 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Handover due to Level(2/2)Handover due to Level(2/2)Equations 1 and 2 are used if parameter enableHoMarginLevQual is set“Yes”如果参数如果参数enableHoMarginLevQual设为设为”Yes”则使用方程则使用方程1和和22 dBhoMarginLev=4 dBTrigger for Ha
23、ndover due to Level触发由于电平的切换触发由于电平的切换AB=Cell B is not selected as candidate for HO due to level since 2dB 4 dBB小区不被作为电平切换的侯选小区小区不被作为电平切换的侯选小区,因为因为2dB Cell B is selected as potential candidate for HO due to Quality since 2 dB 0 dB B小区选为质量切换的潜在侯选小区小区选为质量切换的潜在侯选小区,因为因为2dB0dBThreshold (Lev)-95 dBm NOKIA
24、BSSPAR FOR S9/03.04.2000/Cellular Network Planning page:16 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Handover due to InterferenceHandover due to Interference干扰切换干扰切换干扰切换干扰切换 (1/2)(1/2)Trigger触发:Threshold Comparison门限比较 Threshold Comparison for Quality 质量门限切换(hoThresholdsQualUL/DL(px-nx)Thresho
25、ld Comparison for Level 电平门限切换(hoThresholdsInterferenceUL/DL(px-nx)Candidate Selection 候选小区选择Priority InterCell/Intracell selected at BSC independently UL/DL BSC上下行小区间/小区内优先级 Priority Inter Quality HO if Any Target Otherwise Intra Cell HOenableIntraHoInterfUL/DLY/NhoThresholdInterferenceUL/DL-110 -4
26、7px1 32nx1 32ParameterValuehoPreferenceOrderInterfUL/DLINTER/INTRABSCPriority Intra Intra Cell HO小区内切换 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:17 HANDOVER PROCESSHANDOVER PROCESS切换过程切换过程切换过程切换过程Handover due to InterferenceHandover due to Interference干扰切换干扰切换干扰切换干扰切换 (2/2)(2/2)Eq
27、uations 1 and 2 are used if parameter enableHandoverMarginQual is set“Yes”如果参数如果参数enableHandoverMarginQual设为设为”Yes”则使用方程则使用方程1和和2 hoThresholdQual =4hoThresholdInterferenceDL=-85 dBmhoPreferenceOrderInterfDL=intra Trigger for Handover due to Interference干扰切换触发干扰切换触发AB-Field strength higher than thres
28、hold场强高于门限场强高于门限-Bad quality 质量差质量差=Interference 干扰干扰=intra cell handover!小区内切小区内切换换Threshold(Interference Lev)-85 dBm50 NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:18 HANDOVER PROCESSHANDOVER PROCESSParameters enableBSSHandoverControl enableIntracellHandover enablePwrBudgetHandover
29、 enableMSDistanceHandover enableSDCCHHandover enableUmbrellaHandover hoPeriodPBGT(HPP)hoPeriodUmbrella(HPU)ParameterValue hoThresholdsLevDL/UL(LDR/LUR)rxLevel px(LDP,LUP)默认是默认是1 nx(LDN,LDP)默认是默认是1-110.-47(dBm)1.321.32Yes/NoYes/NoYes/NoYes/NoYes/NoYes/No0.63(SACCH periods)0.63(SACCH periods)NOKIABSSP
30、AR FOR S9/03.04.2000/Cellular Network Planning page:19 HANDOVER PROCESSHANDOVER PROCESSParameters,continuedParameterValue hoThresholdsQualDL/UL rxQual px nx0.7 1.321.32 msDistanceHoThresholdParam msRangeMax px nx0.63(TA)1.321.32-110.-47(dBm)1.321.32 hoThresholdsInterferenceDL/UL rxLevel px nx NOKIAB
31、SSPAR FOR S9/03.04.2000/Cellular Network Planning page:20 HANDOVER PROCESSHANDOVER PROCESSParameters,continuedParameterValue minIntBetweenHoReq0.30(s)minIntBetweenUnsuccHoAttempt0.60,255 0,release immediately1 s time to try imperative HO60 s time to try imp.255,no release,only imperative HO attempts
32、 msDistanceBehaviour0.30(s)NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:21 HANDOVER PROCESSHANDOVER PROCESSAdjacent Cell ParametersParameterValue adjacentCellId lac ci0.655350.65535 bsIdentityCode ncc bcc0.70.7 bCCHFrequency1.124(GSM)enableHandoverMarginLevQual hoLevelUmbrella(AUCL)Y
33、es/No0.7 hoLoadFactor-110.-47(dBm)NOKIABSSPAR FOR S9/03.04.2000/Cellular Network Planning page:22 HANDOVER PROCESSHANDOVER PROCESSAdjacent Cell Parameters,continuedParameterValue hoMarginLev(LMRG)-24.24(dB)hoMarginQual(QMRG)现网是现网是0-24.24(dB)hoMarginPBGT(PMRG)现网是现网是6-24.24(dB)hoPriorityLevel(PRI)现网是现网是2 msTxPwrMaxCell0.7-110.-47(dBm)rxLevMinCell13.43(dBm)synchronizedYes/NomsPwrOptLev-110.-47(dBm)N(no optimization used)
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