诺基亚异频负载均衡报告0315AMLE.docx
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诺基亚异频负载均衡报告0315AMLE.docx
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诺基亚异频负载均衡报告0315AMLE
诺基亚异频负载均衡报告-20160315---AMLE
诺基亚异频负载均衡报告
诺基亚北京项目LTE优化组
2016年3月
1.背景
在LTE中,由于小区半径的减少,用户分布不均匀的现象十分严重,经常会出现某个小区负载较重而其邻居负载较低的现象,不仅会降低网络容量而且还会影响到用户的服务质量。
上述原因直接促使了负载均衡技术的诞生,在保证用户的服务质量的同时,使网络总容量达到最大化。
目前所支持的负载均衡功能如下:
ØiFLB:
InterFrequencyLoadBalance异频负载平衡
当高负荷小区的负荷超过HighLoad门限后进入iFLB激活状态,并可以触发LB切换,直到小区负荷低于Targetload门限,则退出iFLB激活状态;
在iFLB激活状态期间,ENB间的负荷信息不通过X2接口进行交互,所以这种状态下触发的LB切换属于邻区负荷未知的盲切换,只要目标邻区的下行rsrp大于设定的LNHOIF:
thresholdRsrpIFLBFilter参数门限就会触发。
而当切换请求消息(HandoverRequestCause:
ReduceLoadinServingCell)发送给异频的目标邻区时如果邻区负荷已经超过了自己小区设置的TargetLoad门限的话,邻区会拒绝该切换请求。
ØAMLE:
ActiveModeLoadEqualization主动模式负载均衡
小区开通AMLE功能后,当小区的负荷门限高于HighLoad的时候,小区会触发和异频邻区的负荷信息交换,它通过X2连接获取邻区的CAC信息(即邻区的综合可用容量),当主小区和异频邻区负荷满足如下条件时触发AMLE的LB切换:
•当邻区可用容量与本小区的可用容量差值大于设定参数门限AMLEPR:
deltaCac时则触发LB的切换
•主小区的可用容量 maxCacThreshold •邻区的可用容量>=AMLEPR: cacHeadroom •UE检测到的目标邻区的下行rsrp大于设定的LNHOIF: thresholdRsrpIFLBFilter参数门限 iFLB与AMLE的区别: iFLB AMLE 当小区达到高负载门限时,iFLB提供负载均衡 AMLE将小区与配对邻区的负载差异控制在所设的负载差值以内 iFLB的目的是把小区的负载控制在所设的负载门限下,而不是平衡小区间的负载 候选邻区的筛选过程类似iFLB 负载的信息只在同个eNB的小区间分享;对于不同eNB小区使用的是盲切换,不根据邻区的负载情况来判断 小区间使用资源状态报告(RSR)来分享负载情况,不使用盲切换,对于没有RSR的邻区将不会被切换 2.负载均衡功能测试 2.1异厂家负载均衡功能测试 为进行Nokia和HWLTE基站间负载均衡的实验,选定实验点为首都机场T1出发厅。 如下图所示,涉及到的Nokia小区为朝阳机场T1F2至F3层公共区NLM(ENBID: 76309),涉及到的HW基站为顺义首都机场T1航站楼F2F3东侧办公餐饮区及出港大厅HLM499769-132。 2.1.1参数设置 Ø开启featureLTE1531: Inter-frequencyLoadBalancingExtension(开启iFLB) ParameterName ParameterFullName MOC 默认值 修改值0301 9: 06~13: 00 修改值0226-2 10: 45~11: 30 修改值0226-1 10: 00~10: 30 actInterFreqLB Activationofinterfrequencyloadbalancing(iFLB) LNBTS false TRUE TRUE TRUE thresholdRsrpIFLBFilter Inter-Frequency LBThresholdforRSRPTargetFilter LNHOIF -98 -95 -95 -95 thresholdRsrqIFLBFilter Inter-Frequency LBThresholdforRSRQTargetFilter LNHOIF -12 -12 -12 -12 targetLoadGbrDl DLGBRresourcetargetload LNCEL 50 50 50 50 targetLoadNonGbrDl DLnon-GBRresourcetargetload LNCEL 75 75 5% 8% targetLoadPdcch PDCCHtargetload LNCEL 50 3% 50% 5% iFLBHighLoadGBRDL Inter-FrequencyLoadBalancingDLGBRHighLoad LNCEL 60 60 60 60 iFLBHighLoadNonGBRDL Inter-FrequencyLoadBalancingDLnon-GBRHighLoad LNCEL 85 85 8% 10% iFLBHighLoadPdcch Inter-FreqLoadBalancingPDCCHHighLoad LNCEL 80 5% 80% 7% nomNumPrbNonGbr NominalnumberofPRBsforloadbalancing LNCEL 1 10 10 10 iFLBBearCheckTimer Inter-FrequencyLoadBalancingQCI1BearerCheckTimer LNCEL 12 12 12 12 prohibitLBHOTimer ProhibitLoadBasedHandoverTimer LNCEL 10 10 10 10 iFLBRetryTimer InterFreqLoadBalRetryTimer LNCEL 60 60 60 60 Ø开启featureLTE1841: Inter-FrequencyLoadEqualization(开启AMLE) MOClass ParameterName ParameterFullName 默认值 修改值3月1日 16: 39: 00 LNBTS actIfHo EnableinterFrequencyhandover enabled enabled LNBTS actAmle Activateactivemodeloadequalization false TRUE LNBTS actInterFreqLB Activationofinterfrequencyloadbalancing(iFLB) false TRUE LNBTS prohibitLBHOTimer ProhibitLoadbasedhandovertimer 10 10 LNREL amleAllowed Activemodeloadequalizationallowed false TRUE LNREL removeAllowed Removeallowed true FALSE LNHOIF thresholdRsrpIFLBFilter Inter-freqloadbalthresholdforRSRPtargetfilter -98 -95 LNHOIF thresholdRsrqIFLBFilter Inter-freqloadbalthresholdforRSRQtargetfilter -12 不设置 LNCEL cellResourceSharingMode Cellresourcesharingmode none none LNCEL threshold2InterFreq Thresholdth2interFreqforRSRP -100 -90 LNCEL threshold2a Thresholdth2aforRSRP -96 -87 LNCEL iFLBRetryTimer InterFreqLoadBalRetryTimer 60 60s LNCEL iFLBHighLoadGBRDL Inter-frequencyloadbalancingGBRhighloadDL 60 60% LNCEL iFLBHighLoadNonGBRDL Inter-frequencyloadbalancingnon-GBRhighloadDL 85 8% LNCEL iFLBHighLoadPdcch Inter-frequencyloadbalancingPDCCHhighload 80 80% LNCEL iFLBBearCheckTimer Inter-frequencyloadbalancingQCI1Bearerchecktimer 12 12s LNCEL cellCapClass Cellcapacityclassvalue 100 100 LNCEL targetLoadGbrDl DLGBRresourcetargetload 50 50% LNCEL targetLoadNonGbrDl DLnon-GBRresourcetargetload 75 5% LNCEL targetLoadPdcch PDCCHtargetload 50 50% LNCEL mlbEicicOperMode ModeforcalculatingtheCACinloadbal.andeICIC allUes allUes LNCEL nomNumPrbNonGbr NominalnumberofPRBsforloadbalancing 1 10 LNCEL ulStaticCac StaticCACforuplink 100 100 LNCEL ulCacSelection UplinkCACsourceselection ulReflectDlCac ulReflectDlCac LNCEL-AMLEPR amlePrId amlePrId 0/1 0 LNCEL-AMLEPR deltaCac DifferenceinCACofsourceandtargetcells 20 5% LNCEL-AMLEPR cacHeadroom HeadroominCAC 0 0 LNCEL-AMLEPR targetCarrierFreq Targetcarrierfrequency 39148 LNCEL-AMLEPR maxCacThreshold ThresholdformaximumCAC 100 100 2.1.2实验效果 Ø开启featureLTE1531: Inter-frequencyLoadBalancingExtension(开启iFLB) 开启featureLTE1531后,指标统计Nokia76309-1和HW499769-132基于iFLB的LBHO全部成功,信令显示触发原因为reduce-load-in-serving-cell,符合预期。 SDATETIME ENB_CELL HO_LB_ATT HO_LB_SUCC HIGH_CELL_LOAD_LB 201602261000 76309-1 1 1 18 201602261015 76309-1 4 4 25 201602261030 76309-1 7 7 32 201602261045 76309-1 28 28 91 201602261100 76309-1 3 3 16 201602261115 76309-1 1 1 11 201602261130 76309-1 3 3 25 201603010945 76309_1 3 3 28 201603011000 76309_1 43 43 215 201603011015 76309_1 8 8 62 201603011030 76309_1 0 0 4 201603011045 76309_1 1 1 14 201603011100 76309_1 8 7 22 201603011115 76309_1 51 44 146 201603011130 76309_1 20 16 80 201603011145 76309_1 16 15 71 201603011200 76309_1 2 1 10 201603011215 76309_1 52 40 170 201603011230 76309_1 7 7 33 201603011245 76309_1 20 17 62 201603011300 76309_1 2 1 13 Ø开启featureLTE1841: Inter-FrequencyLoadEqualization(开启AMLE) 开启featureLTE1841后,指标统计LBHO有尝试计数,信令显示触发原因也为reduce-load-in-serving-cell,但同时也开启了iFLB,为了区分LB基于具体feature,抓取wireshark,Nokia小区有发起资源请求,但未出现厂家间资源信息交互。 SDATETIME ENB_CELL HO_LB_ATT HO_LB_SUCC HIGH_CELL_LOAD_LB 201603011600 76309_1 0 0 0 201603011615 76309_1 0 0 0 201603011630 76309_1 47 36 156 201603011645 76309_1 55 46 229 201603011700 76309_1 0 0 0 201603011715 76309_1 0 0 0 76309向HW小区发起的资源请求消息类型为CompositeAvailableCapacityPeriodic,周期性综合可用容量。 IE/GroupName Presence Range IEtypeandreference Semanticsdescription Criticality AssignedCriticality ReportCharacteristics O BITSTRING EachpositioninthebitmapindicatesmeasurementobjecttheeNB2 isrequestedtoreport. YES reject (SIZE(32)) FirstBit=PRBPeriodic, SecondBit= TNLloadIndPeriodic, ThirdBit=HWLoadIndPeriodic, FourthBit=CompositeAvailableCapacityPeriodic. Bits5to32shallbeignoredbytheeNB2 2.2同厂家同站双载波负载均衡功能测试 为进行Nokia同站内各载波间负载均衡的实验,选定实验点为76413朝阳机场2号航站楼出发厅南侧NLM,该站点两个载波业务量和用户数分布不均。 2.1.3参数设置 开启featureLTE1841: Inter-FrequencyLoadEqualization(开启AMLE) MOClass ParameterName ParameterFullName 默认值 修改值 3.210: 00 LNBTS actIfHo EnableinterFrequencyhandover enabled enabled LNBTS actAmle Activateactivemodeloadequalization FALSE TRUE LNBTS actInterFreqLB Activationofinterfrequencyloadbalancing(iFLB) FALSE FALSE LNBTS prohibitLBHOTimer ProhibitLoadbasedhandovertimer 10 10 LNREL amleAllowed Activemodeloadequalizationallowed FALSE TRUE LNREL removeAllowed Removeallowed TRUE FALSE LNHOIF thresholdRsrpIFLBFilter Inter-freqloadbalthresholdforRSRPtargetfilter -98 -90 LNHOIF thresholdRsrqIFLBFilter Inter-freqloadbalthresholdforRSRQtargetfilter -12 不设置 LNCEL cellResourceSharingMode Cellresourcesharingmode none none LNCEL threshold2InterFreq Thresholdth2interFreqforRSRP -100 -90 LNCEL threshold2a Thresholdth2aforRSRP -96 -87 LNCEL iFLBRetryTimer InterFreqLoadBalRetryTimer 60 60s LNCEL iFLBHighLoadGBRDL Inter-frequencyloadbalancingGBRhighloadDL 60 60% LNCEL iFLBHighLoadNonGBRDL Inter-frequencyloadbalancingnon-GBRhighloadDL 85 8% LNCEL iFLBHighLoadPdcch Inter-frequencyloadbalancingPDCCHhighload 80 80% LNCEL iFLBBearCheckTimer Inter-frequencyloadbalancingQCI1Bearerchecktimer 12 12s LNCEL cellCapClass Cellcapacityclassvalue 100 100 LNCEL targetLoadGbrDl DLGBRresourcetargetload 50 50% LNCEL targetLoadNonGbrDl DLnon-GBRresourcetargetload 75 5% LNCEL targetLoadPdcch PDCCHtargetload 50 50% LNCEL mlbEicicOperMode ModeforcalculatingtheCACinloadbal.andeICIC allUes allUes LNCEL nomNumPrbNonGbr NominalnumberofPRBsforloadbalancing 1 10 LNCEL ulStaticCac StaticCACforuplink 100 100 LNCEL ulCacSelection UplinkCACsourceselection ulReflectDlCac ulReflectDlCac LNCEL-AMLEPR amlePrId amlePrId 0/1 0 LNCEL-AMLEPR deltaCac DifferenceinCACofsourceandtargetcells 20 5% LNCEL-AMLEPR cacHeadroom HeadroominCAC 0 0 LNCEL-AMLEPR targetCarrierFreq Targetcarrierfrequency 39148 LNCEL-AMLEPR maxCacThreshold ThresholdformaximumCAC 100 100 2.1.4实验效果 修改后76413两载波用户数实现均衡,1小区用户数下降,PRB利用率下降,同时11小区用户数增加,PRB利用率有所上升。 由于是站内切换无明显log显示LBHO,但切换事件均为LB切换的所用事件A4,符合预期。 SDATETIME ENB_CELL HO_LB_ATT HO_LB_SUCC HIGH_CELL_LOAD_LB 201603020800 76413_1 0 0 0 201603020815 76413_1 0 0 0 201603020830 76413_1 0 0 0 201603020845 76413_1 0 0 0 201603020900 76413_1 0 0 0 201603020915 76413_1 0 0 0 201603020930 76413_1 0 0 0 201603020945 76413_1 0 0 0 201603021000 76413_1 138 137 0 201603021015 76413_1 120 118 0 201603021030 76413_1 172 169 0 201603021045 76413_1 237 237 0 201603021100 76413_1 243 240 0 201603021115 76413_1 264
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