軟交換中語音編解碼協(xié)商系統(tǒng)的研究.pdf

1、華中科技大學碩士學位論文軟交換中語音編解碼協(xié)商系統(tǒng)的研究姓名：許月玲申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：王宏遠20060501IIAbstractNGN(nextgenerationwk)wasonemilestoneofthetelecommunicationhisty.AsanintegratedopenwkframewkNGNprovidedvoicedatamultimedia.Throughoptimizingth

2、ewkstructureNGNnotonlyrealizedamalgamationofwkmeimptantlyrealizedamalgamationofoprationsothatgroupingexchangewkcouldinheritabundantoprationfunctionofoldcircuitexchangewkbutalsocouldquicklyprovidenewoperationswhichcouldno

3、tbesuppliedbyoldwkinthewholewk.NGN’appearanceindicatedthearrivalofthenewgenerationoftelecomwk.AstheembodimentoftheseparatenessideaofoperationcontroltransmissionaccesssoftswitchwasthekeytechnologyofNGNsystemframewk.Throug

4、hrealisinghardwarewithsoftwaresoftswitchrealizedcontroltransferoperationprocessingfunctionsofoldswitcheachentityconnectedcommunicationedthroughnmalprotocolssoastorealizeallkindsofcomplicatedprotocolsmequicklyprovideopera

5、tionsmeconvenientlyinNGN.Specificallysoftswitch’sadvantagewasthatsystemstructurewasinfocusclearlysoftswitchwasconvenienttoamalgamationquicklybuildoperationsbetweendifferentwks.Meanwhilesoftswitchoptimizedsystemstructureh

6、adobviousstrongQoSmanagement.NGNcouldprovidemeabundantoperationsthanPSTNwkcouldalsorealizeamalgamationofmanywks.SothebefeCODECnegotiatesystermdesignedfPSTNcouldnotbeadaptedtothenewoperations.Weneededrestudyconsumer’scomm