Construction Arranges The Decoding Consultation Engineering Research And The Design Based On TrFO

UMTS(the Telecommunications System of the Universal Mobile be in general use to move correspondence system) is adoption WCDMA air connect technique of 3 move correspondence system and usually also fasten UMTS to know together as WCDMA correspondence system.UMTS system adoption move structure that correspond by letter system's similar with the next generation to include RAN(wireless connect into a network) and CN(core network), among them RAN processing all function which have relation with wireless, among them net dollar category less, main include BTS and RNC 2 kinds.BTS is homology to Ji station within GSM system, is the basic unit that the wireless signal receive and dispatch, it can support WCDMA of code way.In the RNC(wireless network controller) the function equal to GSM system the PCU of the BSC and the GPRS both combine, it undertake a wireless resources management, BTS control and cut over management etc. function.But all words sound call inside the CN processing UMTS system and data conjunction and realization and exterior network of exchange and road from function.CN from logical is divided into CS(the electric circuit exchange an area) with PS(cent set exchange area), UTRAN(UMTS land wireless connect into a network), CN and UE(customer's equipments) together constitute the whole UMTS system its system structure such as diagram 1 show.valid economical equipments investment, lower a need of deliver the bandwidth and exaltation speech quality, current of move correspondence the system lead go into TrFO(the Operation of the Transcoder Free) technique, then don't need plait decoding conversion operation technique, pass to take outside letter make establishment to don't need plait decoding of passage, establishment empress complete not demand plait decoding machine;In order to can valid economical equipments investment, lower to deliver a bandwidth and exaltation speech quality, expediently born with provide various correspondence business.The TrFO is a 3 G system special, he same request move the both ends use of plait decoding machine type mutually consistent, but he carry on of plait decoding consultation is 1 kind to take outside mechanism.TrFO is the 3 G R4 structure medium new lead go into of technique, is 3 GPP(the 3 rd Generation Partnership Project) organization is orientation 3 G loading and letter make separate of characteristics and satisfy the operator lower equipments cost, exaltation speech quality of the need put forward of standard.With past of the TFO technique compare, TrFO of biggest improvement be the UE which start call and drive call the of UE carry on take outside consultation(OoBTC), if support homology of plait decoding way, then don't carry on code transformation operation in the establishment the business the loading of the process, then don't insert a TC resources.In the WCDMA core net R4 the stage WCDMA network alignment according to soft exchange of network, new lead go into loading and control separate frame, according to BICC agreement of the electric circuit area call letter to make with TrFO technique, support TFO/TrFO.Pass TrFO function, can be valid economical equipments investment, equipments the TC unit in the investment of investment can economical above 30%;The variety AMR velocity combine a mute examination technique, can lower to deliver a bandwidth need.Pass TrFO function, can exaltation speech quality, decrease move call move unnecessarily have Sun plait decoding conversion in the process and conversion hour postpone, exaltation speech quality;Support variety velocity AMR the speech is to open exhibition difference to turn service of foundation.This text was main research according to the TrFO of plait decoding consultation technique and carry on realization in the BICC.This textis to the basic principle, OoBTC mechanism of the TrFO technique, according to TrFO of plait decoding consultation basic realization process, some soft exchange system top how in the BICC the letter the ream realization according to TrFO of plait decoding consultation etc.4 carried on more thorough of research.First, this text introduction the development, the WCDMA core net R4 of the NTT DoCoMo structure and BICC agreement carried on introduction.BICC agreement make loading and control separate become reality, is move correspondence in of a big leap, BICC agreement is according to N-ISUP of letter make agreement, under the circumstance that not influence existing network connect take a net top support in the breadth narrow take ISDN business, the BICC will call control and loading conjunction control separate, it can with any loading technique with each other operation.(like ATM, IP)It separate mechanism of importance the meaning lie in making business real independence at the network, customer can by oneself allocation and definition oneself of business characteristic but need not concern loading business of network form.Then, to the speech plait decoding carry on all say combine to the TrFO technique principle carry on detailed of analysis.Again, the BICC agreement make various cent set the network can provide the complete set business of PSTN/ISDN and include all complement business.PSTN/ISDN business all request luck the quality of the camp class.Because BICC system structure, make the BICC network be very strong flexibility.Textual result is according to TrFO of plait decoding consultation in the BICC the letter the ream of realization, rightness according to TrFO of plait decoding consultation carry on system analysis and design, assurance system soft hardware structure and design concrete of system letter make process.End, put forward in the BICC the letter the ream according to the TrFO of plait decoding consultation of concrete software realization and carry on test.Make network economical resources, exaltation speech quality, what R5 set net usage is a whole net IP, make thus according to TrFO of plait decoding consultation realization simple turn.