LTE空口信令流程详解

1、LTE空口信令流程详解以及相关优化案例汇总1、附着信令流程1.1、 Attach附着信令流程统计时延：红色的为开始和结束信令EPSMMAttachrequestEPSMMUnknown(0x0734)ULCCCHrrcConnectionRequestDLCCCHrrcConnectionSetupULDCCHrrcConnectionSetupCompleteDLDCCHrrcConnectionReconfigurationDLDCCHdlInformationTransferULDCCHrrcConnectionReconfigurationCompleteEPSMMSecuritypr

2、otectedNASmessageEPSMMAuthenticationrequestEPSMMAuthenticationresponseEPSMMUnknown(0x077B)ULDCCHulInformationTransferDLDCCHdlInformationTransferEPSMMSecurityprotectedNASmessageEPSMMSecuritymodecommandEPSMMSecuritymodecompleteEPSMMUnknown(0x0790)ULDCCHulInformationTransferDLDCCHueCapabilityEnquiryULD

3、CCHueCapabilityInformationDLDCCHsecurityModeCommandDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteEPSMMSecurityprotectedNASmessageEPSMMAttachacceptEPSSMActivatedefaultEPSbearercontextrequestEPSSMActivatedefaultEPSbearercontextacceptEPSMMAttachcompleteEPSMMUnknown(0x072D)

4、ULDCCHulInformationTransferDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteattach.xlsAttach信令流程详解1.2、 Detach去附着信令流程统计时延：红色的为开始和结束信令EPSMMDetachrequestEPSMMUnknown0x0734ULDCCHulInformationTransferDLDCCHdlInformationTransferEPSMMSecurityprotectedNASmessageEPSMMDetachacceptDL

5、DCCHrrcConnectionReleaseEPSSMPDNconnectivityrequestdeatch.xlsDetach信令流程详解2、呼叫业务信令流程2.1、 UE主叫信令流程统计时延：红色的为开始和结束信令EPSMMExtendedservicerequestULCCCHrrcConnectionRequestDLCCCHrrcConnectionSetupULDCCHrrcConnectionSetupCompleteDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteDLD

6、CCHsecurityModeCommandDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteUE主叫信令.xlsUE主叫信令流程详解2.2、 UE被叫信令流程统计时延：红色的为开始和结束信令DLPCCHPagingEPSMMExtendedservicerequestULCCCHrrcConnectionRequestDLCCCHrrcCon

7、nectionSetupULDCCHrrcConnectionSetupCompleteDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteDLDCCHsecurityModeCommandDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteDLDCCHrrcConnectionReconfigurationULDCCHrrcConnectionReconfigurationCompleteili

8、tiUE被叫信令.xlsUE被叫信令流程详解3、重选与切换信令流程3.1、 小区重选信令流程DLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHsystemInformationBlockTypelsysteminformationsystemInformationBlockType1systemInformationBlockTypelsysteminformationsystemInformationBlockTypelsystemInformatio

9、nBlockTypelsystemInformationBlockTypel重选.xls重选信令流程详解3.2、 基站内同频切换信令流程统计时延：红色的为开始和结束信令ULDCCHDLDCCHULDCCHDLDCCHULDCCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHDLBCCH:DLSCHmeasurementReportrrcConnectionReconfigurationrrcConnectionReconfigurationCompleterrcConnectionReconfigurationrrcConnectionReco

10、nfigurationCompletesystemInformationBlockType1systemInformationBlockType1systemInformationBlockType1systemInformationBlockType1systemInformation基站内同频切换信令流程详解基站内同频切换信令.xlsULDCCHDLDCCHULDCCHDLBCCH:DLSCHDLDCCHULDCCH3.3、 基站间同频切换信令流程统计时延：红色的为开始和结束信令measurementReportrrcConnectionReconfigurationrrcConnecti

11、onReconfigurationCompletesystemInformationBlockType1rrcConnectionReconfigurationrrcConnectionReconfigurationComplete基站间同频切换信令流程详解基站间同频切换信令.xls4、跟踪区域更新信令流程4.1、新小区所属跟踪区域不在终端跟踪区域列表中信令流程T_TJCD£15-u.*Sa9a.V立餐十建?SX<届第：/事n*tvE£«<a匚I71.-tPX.X1lJ03.Hu.鼻*1*3a.JEX4HlF£«Xr大雪入H1事事?

12、一"Zif/恻Uaju>h*a*>C_,*KuJ-f+14BHC.p丹卞Z-Lki-I1口其暝一&事事!、寸尸a-i-Ma下.JL5.聚.寸Ml豆一%,Id*4匚QZl>HJ_l43ta."l-1.r*-Pf五生叱丁工if却二C-*-*-3La.3Laa-C*.XJ_i_J|-3*+Mb4.2、周期性跟踪区域更新信令流程UEE-FToc工,B-EC14<：tiaju.1L«aU.“工mss工,2KLUC+UA4-&tuE.1 -：j!wirPe-m!I.J"工©d场tirra；白EfC&iufLa

13、_.ITAS!1X413XfA1t4Trpj.4Mt.flTT6ftIb_DLTni±«nuiTia工iewfci油TA.I1443lill*A.3*4,幄人CI六卫7TTtlufful*i-iaa.T,*&iIHftkSIM«llULf丸“*UJiliftI*C4tlL>k>1»六、优化案例1.1、 PUSCHBLER高案例问题现状：最近在上南路高青路做业务测试时发现PUSCHBLER较高,分别对Cell175进行了多次不同状态下的测试,分别为由其他小区切换至Cell175、处于定点状态下占用Cell175、处于移动状态下稳定占用C

14、ell175进行测试,在这三种状态下,Cell175的PUSCHBLEW均很高,同时,在占用Cell175的时候,UE会屡次出现重建的情况.上南路高青路问题路段调整前测试情况:?在切换占用上Cell175以后测试情况截图Modem心3匕前亡小I0忙an)|占亡e!M=t弓弓也qe)|3七国1:旧户仁口皿|0七臼由今月汽口时|PUg.HRLER1TRAFFIC175-1TRAFFIC1754TRAFFIC1755TRAFAC1755TRAFFIC1/51TRAFFIC1754TRAFFIC1754TRAFFIC17526TRAFFIC17b24TRAFFIC17529TRAFFI匚015TRAF

15、FIC17521TRAFFIC17521TRAFFIC17520TRAFFIC17B19TRAFFIC175TRAFFIC17515TRAFFIC175T9TRAFFIC175T9TRAFFIC17515TRAFFIC17514TRAFFIC17520THAITIC17512TRAFFIC17511TRAFFIC175BTRAFFIC17521TRAFFIC175TRAFFIC17513NOSERVICE175TRAFFIC17513TRAFFIC175TRAFFICV511bJ62R7国电反禽Frtfi1L4bfr7577冷门"7380芯ms&85s4m*印的沿nzal网9

16、3竿国一F一一-fa-E87吒S44H3.3455S&G55二555'558I6C'27SR'E85也?在定点状态下林山5式加石|SCfCrlllDgM汇3月3|ECdiTINR匚口njSOII-RSRRComlPUS2l*DLEnTRAFFICTRAFFICTFWF1UTRAFFICTSAFHCTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFIC；TRAFFICTRAFHCTRAFFIC：TRAFFICIKAI-HCTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICT

17、RAFHCTRAFFICTFWKF1CTRAFFICTRAFFICTFtFFinTRAFFICTFWI-HCTRAFFIC5ri55-h-r-nn5bFn5b5rin5-b5nrh-6rr5b5riF5b5777孑/777/77/777孑./7771/777不7|7717,7(/72A2J92Ru/s1.I1Go7oo7n7o7n7y77bI5454bJrJ4544r>4S4545b545454544454545»-T*!二"JT=*.iaTHaJ花用77在力7777用而无花74花而乃衿西HUM77而而/花7,7475花花衿而76力77-mTn-XT»IB*

18、!-aT-*T-A«T-*4s45454544444443434342424242424141414141404040403939333939加383830?处于移动状态稳定占用Cell175MudefriSldCusSCel-CelllDfCornlSiLel-RSSIlCuulISCtll-ClNfifCumlSCell-FiSRPTCOTMPUSCHBLERTPAFHCTPAFHCTnAmcTRAFFICTFAFirTFAFHCTFAITJI：TRAFFiCTRAFFICTRAFHCTRAFFICTHAFHCTPAFHCTRAFFICTRAFFICTRAFFICTRAFHCTR

19、AFFICTRAFFICTHAFFiCTRAFFICIHAFF1CrnAFFlCTRAFFICTnAmcTRAFFICTMAFHCTRAFFICTRAFFICIFAFF?S757G产为75咫757S用15?,££07,742414507722-7-6.-e-7-77-c韦6-6UJ44956万-57u545n019£石-K-52423202341oQ*923932222212222GE22调整举措：对Cell175进行了Lock&Unlock操作.410253046QBBBsBnDB717n3888T7F71,I444947474G4£47的48

20、4648曲517270CSb：i自54父52525252&1M印均会出现PUSCHBLEW偏高的问题已经得到了解决.调整后,在切换占用上Cell175的时候,PUSCHBLEW值维才I在10以下,原先在Cell175的过程中会频繁重建的问题也得到了解决.调整后复测情况如下列图所示：Mo田n£图掂SM心I向mJ.|ECd由汨笈时弓整旧帖巨口im|S匚MF$RP5|PUSHELERTFAFP1匚TRAFFICTRAFFIC怕邛口CTRAFFICTRAFFICTRAFFICIfWPC1IWRCTRAFFICTRAFFIC1FWFICTRAFFIC1RAFRCTRAFFICTRAFF

21、ICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFIC1RAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFICTRAFFIC1RAFPC48fl333£22222N223162980力七£1'2而再再而再乃百方75乃757575方7575万万75乃西2Erfrc97oEs7_CGzfl_EJi-3EA2E-44444-4444444444-4J.253756Gfi71di1u556«b17222222232222222Na22AH3224113334424323231122丁-1；

22、J;m;彳；/;10ggcogcog77777£666666E£6EE6EE6后续问题：已经抓取了UE侧和eNB侧的相关Trace,准备进一步分析定位问题.1.2、 天馈调整案例问题现状：在上南路永泰路路段附近进行业务测试时,UE在Cell183和Cell181之间切换的过程中会出现SNR突降,同时检测到许多奇怪的CellID的情况,导致切换失败事件频发.怀疑是Cell181和Cell183小区之间的干扰所导致的,准备对Site61的天馈进行了相应的排查和调整.Site61基站查勘情况Sitc61%际所在检置,由于与规划位置相差莪大,故on和按煦规划的3g废耒放置的话,无发

23、实财上南路的最正确覆盖,故将.式11183的方位角调整为355度.£ite£l规划设廿所在的位置,故仃11183方位角为碧25度时可以这到对上南路比拟好的覆盖支效果*7电/1、Site61Cell183方位角由325度调整为355度,下倾角由0度调整为6度;Cell183方位角调整情况说明:如上图所示：由于Site61PD125的实际位置与规划位置存在偏差,故对Cell183的天线方位角由325度调整为355度；同时,Cell183的电子下倾角由于工程的原因未进行下压,故今天将其由0度调整为6度.2、Site61Cell184方位角保持160度不变,下倾角由0度调整为4度.

24、Cell184的电子下倾角由于工程原因未进行下压,故将其由0度调整为4度,Cell184的实际方位角为160度,已经处于最正确角度,故未进行调整.进行调整的余量,在原问题路段进行复测,复测过程中发现：在原问题路段,Cell181与Cell183切换的过程中依然会出现SNR急剧下降,以及会检测到许多奇怪的CellID的情况,如下列图所示：S8mgmS除去CollInfo明油IL1)工I互M麟RitfsIEiat43:0613TmsStanpCual22MO3S32BIRAJ|UEModemStaticTRftAFlC|1"1RifFnwjuftnqf216000MHrTmFjuwwy1

25、97000同HrMIMOTypoMIMOoilMaIIIITvrne1(M3临1M*nettomptirttRxPwsrThP*hvM.O&fimPLMtHCellNum1M1SavingGellID181ScrangUNR：iloom.IServingRSS1-GIOWEmSermqRSflP6.加1所1n4MU口RSRPR33-1BcatNl(33766dM5450dem-4308dBfTK-W.OGdBrFi1kM出1BJ-U4&MDm-5aS7dBpiteatMim以tnW：4253TflAFFIC10110:41OHTR4FIC10110:4301TRAFTIC1M1

26、0:402TRAFIC18110.n01TRAFFIC181IQR3Q5TRAGIC18110:43OBTRAFFIC181IO:4J.07TRAGIC咯mAFFIC1011 S'l!HdQ白叱 KJ9心771B3E；行了9,晔71557-BD?IT府金-S3779 SG3'S375J431,鸵72.7 654的72.747之El854盯7274IJserCm.ph调整之后覆盖情况安捷伦测试出图:CellID情况出图CINR情况出图RSRP情况出图_2O1Q_0J9J11整J0.6451kihkmrttr«111CJJO四、后续问题:已经将调整前后的问题向TIS进行了

27、反映,经过协商讨论,我们将在明天进一步地对由于所加邻区数量过多所造成的在切换的过程中SNR下降以及出现奇怪的CellID的情况.1.3、 UE问题造成切换失败多案例问题现状：在上南路永泰路附近进行业务测试时,发现Cell181与Cell183之间切换失败较多,同时在切换过程中会伴随着SNR下降,并且出现很多奇怪的CellID的情况,对附近道路的业务影响较大,随后分别对该小区的邻区的进行删减等相关优化工作.1、删减逻辑邻区的数量在删减了逻辑邻区以后,Cell181和Cell183之间的切换成功率有所提升,同时,在切换的前后发生RRC重建的次数也明显减少.但是,在Cell183和Cell181切换

28、的过程中依然会出现SNR突降,以及出现许多奇怪的CellID的情况如下列图所示.二回国Cuminori-SCwHhifu77133I734417一口-5&>G用-6EEEby-4-523212224招23252sfi-lz-12s3Ki'BexnAgiwT1-5T4935&aar4aKIWTLIEMntk-mSlmiaTWTICiRuFnoqtianry00NHjTkFmaquone197T1nom?hlMQ"PIMQ3"liwir71:取49口加Tisit-像歌“A6>irPaiiw闵TitRmw6-WHR-PtMN-1WOTht*qh

29、bcMHun4Sama8ID建一SermqiCrMRSwRSS布|迎酎fljniinHRSRPOMMbw3II>E9SRPfl1时助a*ft,X心,1RB卬1加啊曷胸限X41B1XN5虻拼印那皿ECdl-RSRPfCnmThiEIMcdME.gISEutUJ口E口由SCe4RSSVCdi«pAel115141TRAFFC11卬与1做4七115143TRAFFIC11早网TPaFFC11.51.45TRAFFIC1印.把TRArFIC11S147TRAFFIC111-4STPAFFCTRAFFCnSl:51IIWFIC11知能TIWFC1T5153TRtfFC115154IFQF

30、BC2、删减逻辑邻区的数量,同时LockSite63在删减了逻辑邻区,同时Lock住Site63以后,在原问题路段进行复测,复测过程中发现：Cell181和Cell183之间的切换趋于正常,切换成功率变高,在切换的前后也发生RRC重建的次数也明显减少,但是,在屡次测试的过程中发现两个问题如下列图所示：1、在Cell183和Cell181切换的过程中,UE依然会检测到奇怪的CellID,但是,此时CINR值却维持在较高的数值,没有发生突降；2、在进行反复屡次测量之后,Cell183向Cell181切换的过程中,还是出现了SNR突降的情况.QICorman-SBasicCelltn/u(Mubil

31、el)口归/ukInfofM12QT轴匐TIma12Mm播£wjUE-幡uJt琐事屿TRftTFiC的FrsQucnrfnrSwtHJOMHsTk-隹MlM0"ypBMWOgn丽Ime1lOTSC.4d2TineSlampfjs；!12&021+I77IR:Poiw-%DGdbnTrPew显CNkEmF1.MN49J0SMehbofOelMm45snnngiCalIDSoFYingCIM4|laiKhS二T后9用0-71DM&nSfFRfW135041岛wi.jkg:GJDRMPRSSI&U1Ml»4M?A4肝57册.925dBfi>

32、bcMhS271>B1j*(HMo4131dAmTint;M.jeiuidiLsstdimej.配in*iiCu*占亡nqinf忙心)£/片的2心刈的Mnon7.£*：yfc微升匕|回国1出罹圜asg12;O6;1i1-.L:IJ12:06:14I2;O6;18I2：耳;16U:0E:1B12:08:1912;用洌12:36:2辟丽寓寓富vuiFMTMJlidjlTJ|»Iucc1-.n.uasnou./IDoILK-P7鞘钝uaU2ullt33QHsns电导口Tha7yu-97|Timo_McdotriGih:£01011口10«

33、63;CMRW£h_Cgn£匚?1口用匚5.冢0|2£鼻/.制P2.0137Ml：京<2D14nI-2:01:41k:U1:G-?ntr12：O1：44上ui：世叱口户12:01:：Qtie-?014S101:50TFWK11-A-1.TfjjncTFAfneTF-FILTFaTlIFAr|.fF-HLTFMFTrrwncTFAFF1CTFTII：I：A-I.“叼.的：HJifB'.HiFJ,叫fiUJ-xzs-EicTh-Dbh-Jm打门3204-3h-2o1u1311Js/-.4；£-227T5i1JJ1:J5s-WJou-b_bq0d

34、j0Q9D99y-一,-Er-3、删减了逻辑邻区,UnlockSite63,换用UE#01进行测试在换用UE#01以后,对整个上南路进行了OneRound的评估测试,在评估测试的过程中发现：换用UE#01以后,整个上南路的测试情况良好除了外环的Site62由于小区Off_Duty出现问题以外,未出现切换失败、以及RRC断链重建的情况,包括Cell183和Cell181的问题路段在内,测试情况非常好如下列图所示4、UE之间性能差异导致的测试结果的差异分析在测试过程中发现：在使用UE#01和UE#025测试的过程中,不同的UE在同一时间同一地点表现出来的性能结果相差比拟大,同时,使用时间长短对于U

35、E的测试情况也会有比拟大的影响.具体测试情况截图所下所示：UE#01linn?,Modem5m史|5Cdl-CdllD(Com)占ChMR占百HGjtiII士ChI-CIHR忙umjWCtillFEFP£Q同l?：IU:UbTfiAFFt-5222-7717：10:06TRAFFIC-5922-8A17in07TFFHC12-9d17:1nonTHFF.r-6D10-93I7：iu：oaTRAFFIC4723L；L17:1U:1UIHbFlCMH!：L17:10:11TP/iFFiC1120-6517:1012TRAFFIC421517:10:13TRAFFIC-IB19-d17:10:14IHI-RLSI16LI17:10:15TRAFFIC14ITJO17:10:16TFFFICU22-7：17:10:17TAFFCTNA.LL.尸-4