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1、南開(kāi)大學(xué)碩士學(xué)位論文TD--LTE核心網(wǎng)研究與系統(tǒng)優(yōu)化姓名:王干申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):通信與信息系統(tǒng)指導(dǎo)教師:張立民2012-05摘要摘要隨著移動(dòng)通信技術(shù)的快速發(fā)展,針對(duì)用戶對(duì)業(yè)務(wù)帶寬、傳輸時(shí)延等多方面的需求,新的移動(dòng)通信系統(tǒng)就必須提供更快的傳輸速率、更穩(wěn)定的傳輸過(guò)程和更小的傳輸時(shí)延。3GPP推出了新的演進(jìn)技術(shù)——演進(jìn)分組系統(tǒng)(EvolvedPacketSystem,EPS),主要包括無(wú)線接12長(zhǎng)期演進(jìn)(LongTermEvolution,LTE)和系統(tǒng)架構(gòu)演進(jìn)(SystemArchitectureEvolution,SAE)。其中LTE技術(shù)定義了兩種雙工方式TDD和F
2、DD。LTE網(wǎng)絡(luò)架構(gòu)分為兩部分,包括演進(jìn)后的接入網(wǎng)E.UTRAN和演進(jìn)后的核心網(wǎng)EPC(EvolvedPacketCore)。在TD—LTE系統(tǒng)測(cè)試中,組合式核心網(wǎng)(ComboEPC)作為一款用于測(cè)試和演示中的核心網(wǎng)系統(tǒng),發(fā)揮了很大的作用。本課題基于TD.LTE技術(shù)基礎(chǔ),針對(duì)組合式核心網(wǎng)在應(yīng)用中出現(xiàn)的問(wèn)題與不足,采用虛擬化技術(shù),以VMwareESXi系統(tǒng)為載體,對(duì)組合式核心網(wǎng)進(jìn)行系統(tǒng)優(yōu)化。該系統(tǒng)較組合式核心網(wǎng)具有穩(wěn)定性好、可靠性高、減少硬件投入及運(yùn)維方便等特點(diǎn),已在實(shí)際的應(yīng)用中發(fā)揮了顯著的作用。本文在敘述本課題的研究背景和意義的基礎(chǔ)上,介紹了LTE網(wǎng)絡(luò)的基礎(chǔ)知識(shí);闡述了本
3、系統(tǒng)采用VlⅣ1wareESXi系統(tǒng)的虛擬化技術(shù)實(shí)現(xiàn)的對(duì)組合式核心網(wǎng)系統(tǒng)的優(yōu)化方案,并詳細(xì)分析了該優(yōu)化方案的設(shè)計(jì)與實(shí)現(xiàn)過(guò)程,以及對(duì)該系統(tǒng)的測(cè)試與應(yīng)用。關(guān)鍵詞:LTEEPC虛擬化技術(shù)VLANAbstractWitlltherapiddevelopmentofmobilecommunicationtechnology.tomeetusgrs’variousneedsonbusinessbandwidth,transmissiondelayandsoon.newmobilebroadbandsystemneedtoprovidefastertransmissionrate,mo
4、restabletransmissionprocessandsmallertransmissiondelay.The3GPPreleasednewevolvedtechnologycalledEvolvedPacketSystem(EPS).ItcontainsLongTermEvolution(LTE)andSystemArchitectureEvolution(SAE),thereimo,LTEhastwoFull—duplexmodeincludeTDDandFDD.LTEnetworkarchitectureisdividedintotwoparts,includ
5、ingtheevolvedaccessnetworkE-UTRANandtheEvolvedPacketCore.ForTD-LTEsystemtest,asaEPCsystemfortestinganddemonstration,ComboEPCplaysacrucialrole.ThisthesisisbasedonTD·LTEtechnology.InviewoftheEvolvedPacketCorenetworkemergedproblemsandshortageintheapplication,thisthesisusingVMwareESXisystemwi
6、thvirtualizationtechnologygivesthesystemoptimizationtoComboEPC.ComparedtoComboEPC,thissystem,whichprovidesbetterstability,higherreliability,reducedhardwareinvestment,operationandmaintenanceconvenientandsoon,hasplayedasignificantroleinthepracticalapplication.Basedonthebackgroundandpurposeo
7、fthetask,thisthesisintroducesbasicknowledgeofLTE.ItexpoundstheoptimizationprojectoftheComboEPCwithVMwareESXisystemthatisbasedonvirtualizationtechnology.T11isthesisgivesusthedetailedanalysisoftheoptimizationprojectandimplementation,aswellasthetestandapplicationofthis