GSM Network Optimization Overview.pptx

42
GSM Network Optimization Overview

Transcript of GSM Network Optimization Overview.pptx

PowerPoint

GSM Network Optimization Overview:: : 32-36pt:

:: : 24pt: Objectives At the end of this course, you will be able to:

A:State network optimization flow and the contentB:Master common network optimization problems analysis and solution

ContentsOverview of radio network optimizationIntroduction of network performance evaluationFlow of Radio Network OptimizationRoutine network optimization tasks Common network optimization problemsNetwork Optimization ConceptObjectThe upcoming networkNetwork in operationPurposeImprove system performanceMaximize service quality under existing system configurationMaximize benefit of existing networkSuggestion of network future maintenance and planningData CollectionData AnalysisConfirm ReasonMake SolutionSolution Implement> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.End-user changes, New calling model, Subscriber distribution changeEnvironment change, New building, road, vegetationNetwork structure changes, coverage, capacityApplication of new technology, new equipment, new standardWhy Optimization> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Maintenance is the foundation of network optimizationNetwork optimization is the further development based on maintenanceMaintenance focus on equipmentNetwork optimization focus on networkMaintenance work is the network value-keeping processOptimization is the network value-added processRelation with Maintenance> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Overview of radio network optimizationIntroduction of network performance evaluationFlow of Radio Network OptimizationRoutine network optimization tasks Common network optimization problemsContentsMeans: check and analyzeCollection customers complainRadio parameterBTS equipmentSystem performance dataObjectives: Output reasonable and objective evaluationNetwork running conditionNetwork operation questionEtc.Concept> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.SDCCH/TCH congestion rateSDCCH/TCH assignment success rateHandover success rateCall drop rateChannel available rateTrafficVoice qualityNetwork performance KPI> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Network test evaluation: through DT and CQT test, simulate users calling process. Reflect the users feeling of communicationResource utilization evaluation: by traffic statistic, export traffic, calculate the utilization of network resources. Reflect the capacity of networkPerformance evaluation: analyze network KPI and output optimization suggestionVoice quality evaluation: evaluation voice quality by MOSNetwork evaluation content> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.ContentsOverview of radio network optimizationIntroduction of network performance evaluationFlow of Radio Network OptimizationRoutine network optimization tasks Common network optimization problemsRequirement analysisRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummaryNetwork status: coverage, voice quality, radio KPI, population distribution, traffic hot spotThe most important problem of existing networkExpected performance KPI and dead line> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Requirement analysisRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummaryGoalsDetail requirementPrepare data & equipmentExpectations indicatorsEstimate timeSpecial requestsFurther detailCustomer requirementHistory P&O reportDigital mapSite informationDT and related test equipment> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Equipment checkRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummaryChecking objectBTS hardware faultAntenna and feeding cableClock problemUnstable power supply systemWorking environment conditionBSC faultAvoid the hardware problem to affect overall network performance> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Data collectionRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummary Current service conditionSystem performance dataField test dataSubscriber complaintsSignaling trace> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Data analysisRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummary KPI statisticsDrive testSubscriber complaintsSignaling data> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Adjust optimization planRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummary Make planCheck planImplementationAvoid frequent adjustmentPartial experiment planQuickly rollback planImplementation stepReasonable timeAudit by expertConfirm feasible solutionDetailed record optimization process and results> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Adjust optimization planRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummary Performance ComparisonComparison of testCompare and analyze the data before and after adjustmentCompare DT resultCompare CQT resultAt the same test period and rout> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Summary and acceptanceRequire analysisPreparationEquipment checkData collectionData analysisAdjust planResult verifySummaryThe work what has been doneThe achievement obtainedDocument> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.ContentsOverview of radio network optimizationIntroduction of network performance evaluationFlow of Radio Network OptimizationRoutine network optimization tasks Common network optimization problems1.Network monitor2.BSS parameter adjustment3.RF optimizationThree kinds of routine work> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Performance statisticsRadio resource availableHandoverDrop callCant call(block, interference)Network access(large coverage, indoor coverage)Voice qualityNetwork monitor> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Hardware monitorHardware fault: Failed board or partial failure of equipmentAbis interfaceA interface BSCCellNeighbor cell listNetwork monitor> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Other monitor methodsDT and CQTSubscriber feeling and customer complaintsEnvironment: New building, External interferenceNetwork monitor> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.BSIC: BSIC=NCC+BCCPeriodic location update timer(T3212)Waiting time(T3122)Reselection parameter indicationCell reselection offset(CRO)Penalty time(PT)Cell reselection hysteresis(CRH)Allowed access minimum receiving(RXLEV ACCESS MIN)BSS PARAMETER ADJUSTMENT> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.1. Antenna check: Azimuth, Tilt down angle, Height2. Feeder cable check: cross connection, VSWR high, connector loose3. Check balance of up/down link4.Check interference of up/down link: Repeated change frequency, Frequency scanner

RF Optimization> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.ContentsOverview of radio network optimizationIntroduction of network performance evaluationFlow of Radio Network OptimizationRoutine network optimization tasks Common network optimization problems1.Coverage2.Interference3.Congestion4.Handover5.Call dropCommon Network Optimization Problem> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.1.Blind spot2.Overshooting3.OverlapsCoverage> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.1.2.3.29Solution:1.Adjust network parameter(RXLEV ACCESS MIN)2.Adjust antenna and feeder3.Increase power of TRX4.Add new siteCoverage> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Phenomenon:1.Bad voice quality2.High call drop rate3.Ping-pong handover4.Handover failureInterference> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Solution:1.Reduce BTS power2.Avoid external interference frequency3.Adjust antenna height, azimuth, down tilt4.Adjust frequency plan5.Use frequency-hoppingInterference> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Phenomenon:1.Incoming handover failure2.Low calling success rate3.Difficult to make a callCongestion> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Solution-SDCCH congestion:1.Check CRH of LAC boundary2.Reasonable plan LAC3.Increase T3122 and T32124.Add SDCCH channel5.Adjust cell access parameter6.Adjust cell selection and reselection parameter7.Check frequency interferenceCongestion> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Solution-TCH congestion:1.Adjust antenna height, direction, down tilt2.Change BTS power3.Adjust cell access, reselection and handover parameter4.Open half rate function5.Expand TRX or add new siteCongestion> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Phenomenon:1.Handover failure or handover success rate low2.Frequent handover3.Unreasonable ratio of handover in/outHandover> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.36Solution:1.Hardware: very high HO failure rate-work out hardware problem2.Neighbor cell: same frequency and same BSIC for nearby cells; lonely island-neighbor cell setting check; define neighbor cell for lonely island cell3.Congestion and transmission fault: neighbor cell high load, neighbor cell TRX fault, neighbor cell transmission fault4.Bad radio environment: check interference5.Coverage: no enough overlap area between source cell and target cell-improve coverageHandover> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Solution:6.Parameter setting problem: check and adjust HO parameter7.LAC not defined in MSC: complete LAC information in MSC8.Signaling link heavy load: A interface signaling load congestion, lead HO signaling lost-ExpansionHandover> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Three type of call drop1:Radio link timeout: MS can not decode SACCH result in RLT timeout and dropped call2.Handover call drop: HO failure, MS is unable to access the target cell, and can not return to the original cell as well3.LAPD call drop: Equipment failure cause the call drop, such as LAPD link break and so onCall drop> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Solution:1.Coverage: blind spot, poor indoor coverage, overshooting-adjust radio parameter, solve hardware problem.2.Handover: unreasonable parameter, neighbor cell not complete, same BCCH&BSIC, traffic congestion-adjust parameter, balance traffic3.Interference: adjust engineering parameter or frequency plan, open frequency hopping, solve equipment problem4.Antenna and feeder: antenna, feeder damage, leak water; feeder mistake connectionCall drop> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved.Solution:5.Transmission: transmission break, interrupt, high BER6.Unreasonable radio parameter: RLT, rxlev-acc-minCall drop> G91, B170G137, B207G174, B239G171, B189:: : 30-32pt:

(1-5):: : 28-12pt: ZTE Corporation. All rights reserved. ZTE Corporation. All rights reserved.Thanks!