诺基亚异频负载均衡报告

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月目录1. 背景 32. 负载均衡功能测试 42.1 异厂家负载均衡功能测试 42.1.1 参数设置 42.1.2 实验效果 62.2 同厂家同站双载波负载均衡功能测试 82.1.3 参数设置 92.1.4 实验效果 103. 遗留问题 131. 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：> iFLB： Inter Frequency Load Balance 异频负载平衡当高负荷小区的负荷超过High Load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Target load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(Handover Request Cause: Reduce Load in Serving Cell)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Target Load门限的话，邻区会拒绝该切换请求> AMLE： Active Mode Load Equalization 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High Load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=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：iFLBAMLE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HW LTE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（ENB ID： 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 HLM 499769-132F2--T】航站楼各小区覆盖范围及路测平均RSRPHUAWQ TECHNOLOGIES CO., LTD.F之层CELL6小区名为顺义首都机 场T1航站楼F1FW西舀区HLMTM. 覆盖T1航站楼西皆区.平均 RSRP^ MdbmF2层CE L L8小区金为顺丈首都机 场T1凯站横四侧办管餐室区 HLM-131 ,骚盖「航站救F2西侧 办公置饮区，平i^R3RP> 70dbmF2Jg CELL7小国髭为晰文首都机 场T1航站楼Fl F2到达大厅及东皆 区HLM-13' 鬣盖T1航站楼籍系皆区，平均ESRP为•就dbEF2层CELLS小区电为同汇B都机 场T1航站楼F2 F 3东俩办公暑饮区 及出港大厅HLM-131,覆盖T1航 站楼F2系恻办公餐钦区.平均 RSRP 为-7 州 bmF2>CELL1Q小区您为顺义苫畚机场T1航站楼 F2F3东侧办公餐伏区及出港大厅HLM-132,霜 盖T1航站楼眩田港大厅，平均RS即为-翁dbmPj£rt 3HUAW£I2.1.1参数设置开启 feature LTE1531: Inter-frequency Load Balancing Extension (开启 iFLB)Parameter NameParameter Full NameMOC默认 值修改值03019:06~13： 00修改值0226-210:45~11:30修改值0226-1 10:00~1 0:30actInterFreqLBActivation of inter frequency load balancing (iFLB)LNBTSfalseTRUETRUETRUEthresholdRsrpIFLBFilterInter-Frequency LB Threshold forRSRP Target FilterLNHOIF-98-95-95-95thresholdRsrqlFLBFilterInter-Frequency LB Threshold forRSRQ Target FilterLNHOIF-12-12-12-12targetLoadGbrDIDL GBR resource target loadLNCEL50505050targetLoadNonGbrDlDL non-GBR resource target loadLNCEL75755%8%targetLoadPdcchPDCCH target loadLNCEL503%50%5%iFLBHighLoadGBRDLInter-Frequency Load Balancing DLGBR High LoadLNCEL60606060iFLBHighLoadNonGBRDLInter-Frequency Load Balancing DL non-GBR High LoadLNCEL85858%10%iFLBHighLoadPdc chInter-Freq Load Balancing PDCCHHigh LoadLNCEL805%80%7%nomNumPrbNonGbrNominal number of PRBs for load balancingLNCEL1101010iFLBBearCheckTimerInter-Frequency Load Balancing QCI1Bearer Check TimerLNCEL12121212prohibitLBHOTime rProhibit Load Based Handover TimerLNCEL10101010iFLBRetryTimerInter Freq Load Bal Retry TimerLNCEL60606060开启 feature LTE1841: Inter-Frequency Load Equalization (开启 AMLE)MO ClassParameter NameParameter Full Name默认值修改值3月1日16:39:00LNBTSactIfHoEnable interFrequency handoverenabledenabledLNBTSactAmleActivate active mode load equalizationfalseTRUELNBTSactInterFreqLBActivation of inter frequency load balancing (iFLB)falseTRUELNBTSprohibitLBHOTimerProhibit Load based handover timer1010LNRELamleAllowedActive mode load equalization allowedfalseTRUELNRELremoveAllowedRemove allowedtrueFALSELNHOIFthresholdRsrpIFLBFilterInter-freq load bal threshold for RSRP target filter-98-95LNHOIFthresholdRsrqIFLBFilterInter-freq load bal threshold for RSRQ target filter-12不设置LNCELcellResourceSharingModeCell resource sharing modenonenoneLNCELthreshold2InterFreqThreshold th2 interFreq for RSRP-100-90LNCELthreshold2aThreshold th2a for RSRP-96-87LNCELiFLBRetryTimerInter Freq Load Bal Retry Timer6060sLNCELiFLBHighLoadGBRDLInter-frequency load balancing GBR high load DL6060%LNCELiFLBHighLoadNonGBRDLInter-frequency load balancing non-GBR high load DL858%8080%LNCELiFLBBearCheckTime rInter-frequency load balancing QCI1 Bearer check timer1212sLNCELLNCELLNCELLNCELcellCapClass targetLoadGbrDltargetLoadNonGbrDltargetLoadPdcchCell capacity class valueDL GBR resource target loadDL non-GBR resource target loadPDCCH target load10010050755050%5%50%Mode for calculating the CAC in load bal. andLNCEL mlbEicicOperModeeICICallUesallUesLNCELLNCELLNCELLNCEL-AMLEPRLNCEL-AMLEPRLNCEL-AMLEPRLNCEL-AMLEPRLNCEL-AMLEPRnomNumPrbNonGbrulStaticCaculCacSelectionamlePrIddeltaCaccacHeadroomtargetCarrierFreqmaxCacThresholdNominal number of PRBs for load balancingStatic CAC for uplinkUplink CAC source selectionamlePrIdDifference in CAC of source and target cellsHeadroom in CACTarget carrier frequencyThreshold for maximum CAC100ulReflectDlCac0/12010100ulReflectDlCac5%39148100100Inter-frequency load balancing PDCCH highLNCEL iFLBHighLoadPdcchload2.1.2实验效果开启 feature LTE1531: Inter-frequency Load Balancing Extension （开启 iFLB）开启 feature LTE1531 后，指标统计 Nokia76309-1 和 HW 499769-132 基于 iFLB 的 LB HO 全部成功，信令显示触发原因为reduce-load-in-serving-cell，符合预期。

SDATETIMEENB_CELLHO_LB_ATTHO_LB_SUCCHIGH_CELL_LOAD_LB20160226100076309-1111820160226101576309-1442520160226103076309-1773220160226104576309-128289120160226110076309-1331620160226111576309-1111120160226113076309-1332520160301094576309_1332820160301100076309_1434321520160301101576309_1886220160301103076309_100420160301104576309_1111420160301110076309_1872220160301111576309_1514414620160301113076309_120168020160301114576309_116157120160301120076309_1211020160301121576309_1524017020160301123076309_1773320160301124576309_120176220160301130076309_12113开启 feature LTE1841: Inter-Frequency Load Equalization （开启 AMLE）开启feature LTE1841后，指标统计LB HO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。

SDATETIMEENB_CELLHO_LB_ATTHO_LB_SUCCHIGH_CELL_LOAD_LB20160301160076309_100020160301161576309_100020160301163076309_1473615620160301164576309 1554622920160301170076309_100020160301171576309_100076309向HW小区发起的资源请求消息类型为Composite Available Capacity Periodic，周 期性综合可用容量IE/GroupPresRaIE typeSemantics descriptionCritiAssignedNameenceng eand referencecalit yCriticalityReport Characteris ticsOBITSTRIN G(SIZE(32))Each position in the bitmap indicates measurement object the eNB2 is requested to report.First Bit = PRB Periodic,Second Bit= TNL load Ind Periodic,Third Bit = HW Load Ind Periodic,Fourth Bit = Composite Available Capacity Periodic.Bits 5 to 32 shall be ignored by the eNB2YESrejectPtowcoI Litfifltfi Info15fl 1d-rLFind1cac1onCZ SACK325K i0fi.205?i7 100 91.22O.2fl 1W.71 6.21i XiAF3Z5^L M a *5*3-21 WQ, Tl 0 211 100.91. Z20.20 SC TP3ZCM ?C51M|10Q 口 C-. 211 3266? m. 67277^i&Drai； 22s5.30 3>：h^- G72&1£ 1AQ. Si. 224.2^32693- Kr9.871651150,71 6.215- 331M-睥.睥0 114- 0fl5&411OD- 91- 220. ID1 H.4. GGGOd.1.140. 91. 224.20 33111. 314. GGQ25-7 LOO. 71. e. 21S 33123- 114. T3t->VL 100, ?ln 22C. 20 3312i| 114- T3U7C L, 91,, 220. 20 331X1 H4-IH1H77 lO(k 71- E. ZLS 33A54 124. asa&SO WO. 91. 224.20enz e m ■?+ £ wIDD./l.b. Jib- lM.7i.fi.215- IM ,91 220.20 100.91.220.2Q 1OD-~1.G.213- UH.71.G. 215 lM.fili.2M.2flI.TliQiZll100.QI.220.20 10O.71.G.2157paptp*ifapaptp#iptp_ 工心宝X2丈心心宝>:2文汽十62 J4C 时 joe 11H142 4 4、1 d-rta wrxgScartvwepQrd ngini g»f! on ]UEK 11 d-r-E^curcti5caTu5H.-&parc1 i^anl id ad 55 ACK1 d-hanctaverPrepar-atinn inFnrrtat lonBl ockSyjt erinFcrnat 1 nnBl oc.kTyvelSIB-2SACK1 d-lundc^arprAparir1on rajccotiiiaceI omccanri gbjn 1 ansack Id-snscaituSTr-^n-sif apS^Ki d-UEContexcRelewc泌kHE4RTMAT曰 icflii： 2 j Id-RAparTChir accar 1st 1csProtoc-olIE-Fi eldid; id-RepcrtChwaccer 1stics (3H) criticjlity: rejact (D-)ft4WC£har>CT«rl£CTi：s. lOUCOGOO [bic Idngfth 32, OtiDL OXiD DCK>0 OQGQ (X>00 0000 OCOO OQGQ vdlufr 2-6^3-34&6]曰 valuA S Ice«= J: ■id-CellTofl.-Epcirt m PrococollE-FieldId. 1d-€ftllrafl.-Bparc (2flJCrlTltallEy! {1)B归1健旧 CeliTgReport-List; 1 1t«i~T^r 0 ； id-C-el 1 ToRfDOrt -Tri-rZ ilme SoiFCt32 JK 3O0n2«i57 iM；a^2O?2O 3ZM1 30B 4CM1Z5 IDO.n. 6.Z11 村国 用W额 IDO. ?i.6.21S 3266? 30a. S72774 1H. fl. 22D.2O 32frM- 309 IM.'M Z2D. 203Z<-91 309-4?1^51 1W. iTL.C.211 331O£ 3U.6MJ3A 1CO.71.G.215- 331W 311,665^13 100. a 220.20 331LQ 314,«K11 1W.91 ZZD.2C遍:王/丑厂 100.91.22Q.ZQ 1.00. di. 224.2d IM. 71. JIS LOT. 71. C. 215 LDd.91.220BEU LOO.SI.224.20 100,71.^.215 LW. 7114.213Li*»gih I痂114 宓w言"r K r K r K 辛Kd-亍d-虹 T1 5 1 5 i IE-46 1 d-hirxlavarpr-tpiarAC ion NascfrsnrarriSiT ioaEl ocks^wtoFEM口riar icral ackiypfilsiE-J!62 S此用■233 id-hmdaverpreparacion RK<«mecti crfteccnFi onpratocallCs: 3 i carsITWn O： 1 d-EIMEl-IM«ii^ur AFAHl： -i E日 ProtacclTE-FieldId; id-€i«Bl-^e*jurewnt-:D-(39J erlElcallryi i 科砒匚(OJ日 VJl iidNeasvrtRcnt-lD-; 35?QIitn 1; i d-E«BZ-Nc4Jurerent -ID-曰 Pforaco'liE.- f1 al dId: 1 tJ-tMn2-w™ur erem -i &

2.1.3参数设置开启 feature LTE1841: Inter-Frequency Load Equalization (开启 AMLE)MO ClassParameter NameParameter Full Name默认值修改值3.2 10： 00LNBTSactIfHoEnable interFrequency handoverenabledenabledLNBTSactAmleActivate active mode load equalizationFALSETRUELNBTSactInterFreqLBActivation of inter frequency load balancing (iFLB)FALSEFALSELNBTSprohibitLBHOTimerProhibit Load based handover timer1010LNRELamleAllowedActive mode load equalization allowedFALSETRUELNRELremoveAllowedRemove allowedTRUEFALSELNHOIFthresholdRsrpIFLBFilterInter-freq load bal threshold for RSRP target filter-98-90LNHOIFthresholdRsrqIFLBFilterInter-freq load bal threshold for RSRQ target filter-12不设置LNCELcellResourceSharingModeCell resource sharing modenonenoneLNCELthreshold2InterFreqThreshold th2 interFreq for RSRP-100-90LNCELthreshold2aThreshold th2a for RSRP-96-87LNCELiFLBRetryTimerInter Freq Load Bal Retry Timer6060sLNCELiFLBHighLoadGBRDLInter-frequency load balancing GBR high load DL6060%LNCELiFLBHighLoadNonGBRDLInter-frequency load balancing non-GBR high load DL858%LNCELiFLBHighLoadPdcchInter-frequency load balancing PDCCH high load8080%LNCELiFLBBearCheckTime rInter-frequency load balancing QCI1 Bearer check timer1212sLNCELcellCapClassCell capacity class value100100LNCELtargetLoadGbrDlDL GBR resource target load5050%LNCELtargetLoadNonGbrDlDL non-GBR resource target load755%LNCELtargetLoadPdcchPDCCH target load5050%LNCELmlbEicicOperModeMode for calculating the CAC in load bal. and eICICallUesallUesLNCELnomNumPrbNonGbrNominal number of PRBs for load balancing110LNCELulStaticCacStatic CAC for uplink100100LNCELulCacSelectionUplink CAC source selectionul ReflectDlCacul ReflectDlCacLNCEL-AMLEPRLNCEL-AMLEPRLNCEL-AMLEPRamlePrIddeltaCaccacHeadroomamlePrId0/1Difference in CAC of source and target cellsHeadroom in CAC20 5%39148100 100LNCEL-AMLtargetCarrierFreq Target carrier frequencyEPRLNCEL-AMLmaxCacThreshold Threshold for maximum CACEPR2.1.4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LB HO, 但 切换事件均为LB切换的所用事件入4,符合预期RRC取大珏接数6050曲302010Qrrn—rtt」L 一 uni rrm■■inii^^^^^Biiiniiiiiii inH 1 II*OMI $百8 吕LDI匚二将持 MLHI 癸曾 E 与5云坦91云 〔竺3蚤最 邑mrTs uomI 卷91云 MU CEJmM O9U E'EJSTOE 号Iwqsf 吕二—|以二出云 McjI 以 eJstm 与 mMJsM GESrJ/VEom noE嗦N吾目 吕00SB™- 004希&目 s.9 z.l^ 昌音遂且 ws Z/Efgaz Mm"由Midi 吕长沼莒w 00土与 zfEfsoz 吕二<偿目 QEO源胃昌 OQOyEfLOToEW曰上行叫B利用率 -日上行叩8利用$■ 76413-1RRC连挫最大数 ■76413-11RRC连挫最大敖76413-1PRB 利用率扫尊贱2CL0 繇00｛踹5.00%76413-11PRB 利用率30.0TO既氓戚ZCLO■繇版0C龄IQjOD^5.0W&C„00^T—W曰上有PRR利月率 •上曰上行PR3利用率76413上行PRB利用率 764B1 3^2 0 Jb-ffPftB利用率 76113-131 3 ±.-ff PRB利用率-7&413-11 3^2E± 行 FRB莉用率 76413-11 J.R1E± 行 FRB 莉用率76413 T行PR8利用率 75J13 ] 3^?3~ 用率 T&41E3 目 1E 下行PRB和用率-7倒口-113月 WE 下 7&413-11 3^1 3~ ifPRB^l用率SDATETIMEENB_CELLHO_LB_ATTHO_LB_SUCCHIGH_CELL_LOAD_LB20160302080076413_100020160302081576413_100020160302083076413_100020160302084576413_100020160302090076413_100020160302091576413_100020160302093076413_100020160302094576413_100020160302100076413_1138137020160302101576413_1120118020160302103076413_1172169020160302104576413_1237237020160302110076413_1243240020160302111576413_1264262020160302113076413_1210205020160302114576413_1207203020160302120076413_1146142020160302121576413_1140139020160302123076413_1156154020160302124576413_1230228020160302130076413_1197196020160302131576413_1219211020160302133076413_1216215020160302134576413_1222218020160302140076413_1168165020160302141576413_1171168020160302143076413_1125122020160302144576413_11621610201603021500 76413120160302151520160302153076413 176413120160302154520160302160076413 176413120160302161520160302163076413 176413120160302164520160302170076413 17641312172332512512582852142932522142312452402512812132892480000000002.3空闲态负载均衡2.1.5参数设置参数名参数全称级别默认值3月15日14： 213月15日12:163月15日9： 16actIdleLBActivation of idle mode load balancing (IdleLB)LNBTSFALSETRUETRUETRUEidleLBCapThreshIdle mode load balancing capacity thresholdLNCEL100100100100idleLBPercentageOfUesPercentage of UE for idle mode load balancingLNCEL070%70%90%idleLBCelResWeightCell reselection weight factor idle mode load balancingLNCEL空空空空idleLBEutCelResWeightEUTRA carrier weight factor idle mode load balancing旧FIM空10070702.1.6实验效果2个载波用户数相当，实现均衡。

PERIOD_START_TIMEenb_lcr76413-1CELL_LOAD_ACT_UE_MAXenb_lcr76413-11CELL_LOAD_ACT_UE_MAX2016/3/15 9:0076413-14176413-11382016/3/15 9:1576413-14376413-11392016/3/15 9:3076413-13876413-11352016/3/15 9:4576413-14076413-11372016/3/15 10:0076413-14276413-11402016/3/15 10:1576413-14076413-11392016/3/15 10:3076413-13676413-11352016/3/15 10:4576413-14176413-11352016/3/15 11:0076413-14476413-11362016/3/15 11:1576413-14676413-11502016/3/15 11:3076413-14676413-11452016/3/15 11:4576413-16176413-11532016/3/15 12:0076413-16276413-11562016/3/15 12:1576413-16176413-11582016/3/15 12:3076413-16976413-11632016/3/15 12:4576413-16276413-11652016/3/15 13:0076413-17076413-11692016/3/15 13:1576413-16476413-11652016/3/15 13:3076413-16776413-11662016/3/15 13:4576413-16476413-11652016/3/15 14:0076413-15776413-11632016/3/15 14:1576413-15676413-11552016/3/15 14:3076413-15876413-11572016/3/15 14:4576413-15576413-11522016/3/15 15:0076413-16176413-11562016/3/15 15:1576413-15676413-11582016/3/15 15:3076413-15776413-11612016/3/15 15:4576413-16376413-115676413最大用户数MKT STA诂 TS 2.M 5<备耳 昌监mrfl诂莒 5号Lrli碧 编TH 2篇的3网 □*£、忌莒 00-3日蒿诂巨 unIXElm/E^IM 口株 Em蒿s-az: STnmnrtxmE: 5^a5

符合预期实验设置38950和39148之间均衡，在idleModeMobilityControlInfo中这2个频点 的优先级最高ucl : rzcLarucucaflii^aLiB z ' iw-rrarDsmioalSemlTiis:-乳 QFxaicQlZRE-cnsxEEia ml ■ rxQ^nfCQE-^D&JclcaK-rl ■ I zhlauwZiuH othMd lalitM3d«44^bL] ^T^anTXA^Ihfa《 jTxc-qrxiQxrayLLgE-ECTTU I：oxi:跆*3*FryiKLUieseLWGlCflFIlOIl^ 5!*rWXltXFi：^ 3WM.C*llM«HiL»=：±«lFFlCFlE.y EUEZXfzCzkq«LIls 3*Lwt i-3iPnoiir-y $MTiieiFriM 次仁 ■»L 1 r.-a m. L vt1： i«i F ri e-rl c y 5iTEcqr£3.i3XiiyLL7clE3AJil IMrwmw 4?carBix=>?£AFC3> Z2 ■^■nJEnJtuxEF =QDrg,WlMgqUgU .B■心I [3. 遗留问题在异厂家负载均衡实验中，基于AMLE并未成功，HW小区未回复负荷信息，需要进彳丁进一步实验。