發(fā)布時間：2018-02-26 19:22

  本文關(guān)鍵詞： WI-FI VoIP網(wǎng)絡(luò) MGCP協(xié)議 UDP/IP協(xié)議　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,國內(nèi)大多數(shù)石油、化工、煤炭等工礦企業(yè),采用PSTN網(wǎng)絡(luò)或VoIP網(wǎng)絡(luò)作為通信系統(tǒng),這種有線接入方式使得這些工礦企業(yè)在環(huán)境復(fù)雜、施工困難的區(qū)域很難鋪設(shè)電纜,特別是在涉及到工人作業(yè)的區(qū)域,這一弊端就更為嚴重;這些工礦企業(yè)通常采用獨立運行計算機網(wǎng)絡(luò)、電話通信網(wǎng)絡(luò)以及程控調(diào)度等多種網(wǎng)絡(luò)系統(tǒng),致使在網(wǎng)絡(luò)建設(shè)和運行過程中產(chǎn)生大量的設(shè)備費、線路費和維修費,增加了企業(yè)成本開支;計算機局域網(wǎng)絡(luò)的最大傳輸速率可達1000Mbps,在上述企業(yè)中,其豐富的帶寬資源沒有得到充分利用,造成了帶寬資源的浪費;同時上述通信系統(tǒng)還存在著呼叫方式單一的缺點,無法實現(xiàn)對不同區(qū)域靈活方便的調(diào)度。為解決上述問題,本課題提出了基于WI-FI技術(shù)的網(wǎng)絡(luò)電話通信系統(tǒng)的設(shè)計,并在對MGCP協(xié)議深入研究的基礎(chǔ)上,提出精簡的O_MGCP協(xié)議。O_MGCP協(xié)議將RQNT命令嵌入到CRCX命令中并使MDCX命令功能也在CRCX命令中完成;加入SDP協(xié)議;支持單呼功能,并在群呼和全呼擴音呼叫時,能夠?qū)崿F(xiàn)擴音呼叫與一般語音通信的靈活切換;省去EPCF命令的設(shè)計。本課題硬件設(shè)計部分共包括WI-FI電話終端、接入點(AP)、媒體網(wǎng)關(guān)控制器(MGC)和中繼網(wǎng)關(guān)(TG)四個子系統(tǒng)。在各子系統(tǒng)的功能模塊中,WI-FI電話終端除了與媒體網(wǎng)關(guān)控制器具有相同的主控模塊、電源模塊、存儲單元模塊、CPLD模塊之外,還具有WI-FI傳輸模塊和MSP430F149單片機鍵盤掃描及液晶(LCD)顯示模塊;接入點作為數(shù)據(jù)轉(zhuǎn)發(fā)中心,主要包含WI-FI傳輸模塊和底層驅(qū)動模塊;中繼網(wǎng)關(guān)為連接PSTN網(wǎng)絡(luò)和分組網(wǎng)絡(luò),主要由主控模塊、中繼接口模塊、音頻譯碼模塊、DTMF轉(zhuǎn)發(fā)模塊和忙音檢測模塊組成。軟件設(shè)計部分包括WI-FI電話終端程序、接入點程序、O_MGCP協(xié)議、中繼網(wǎng)關(guān)程序以及UDP/IP協(xié)議。其中在CCS 3.3軟件開發(fā)平臺上,實現(xiàn)了 WI-FI電話終端、O_MGCP協(xié)議、中繼網(wǎng)關(guān)以及UDP/IP協(xié)議的程序設(shè)計;在Keil4.12平臺上,實現(xiàn)了接入點程序的設(shè)計;在IAR4.10平臺上,實現(xiàn)了 MSP430F149單片機鍵盤掃描和LCD顯示子程序的設(shè)計。在Quartus Ⅱ 8.0平臺上,采用VHDL語言實現(xiàn)了可編程復(fù)雜器件(CPLD)的邏輯控制功能。本課題設(shè)計的WI-FI網(wǎng)絡(luò)電話系統(tǒng)單呼、群呼、全呼三種呼叫方式,還可與PSTN用戶通話,具有維護簡單、組網(wǎng)便捷以及使用靈活的特點,節(jié)省了大量建設(shè)電話網(wǎng)絡(luò)的設(shè)備費、線路費和工程費用,并且提高了工礦企業(yè)網(wǎng)絡(luò)資源的利用率,具有顯著的經(jīng)濟效益和社會效益。
[Abstract]:At present, most domestic oil, chemical, coal and other industrial and mining enterprises use PSTN network or VoIP network as the communication system. This wired access mode makes it difficult for these industrial and mining enterprises to lay cables in areas where the environment is complex and the construction is difficult. Especially in areas involving workers' work, this disadvantage is even more serious. These industrial and mining enterprises usually use a variety of network systems, such as independent operation of computer networks, telephone communication networks, and program-controlled dispatching. As a result, a large amount of equipment, line and maintenance costs are incurred during the construction and operation of the network, thus increasing the cost of the enterprise. The maximum transmission rate of the computer local area network can reach 1000 Mbps. in the above enterprises, Its rich bandwidth resources have not been fully utilized, resulting in a waste of bandwidth resources. At the same time, the above-mentioned communication system also has the shortcoming of single call mode and can not achieve flexible and convenient scheduling of different regions. This paper puts forward the design of network telephone communication system based on WI-FI technology, and on the basis of deeply studying MGCP protocol, puts forward the simplified OMGCP protocol. OMGCP protocol embeds RQNT command into CRCX command and makes the function of MDCX command complete in CRCX command. Join the SDP protocol, support the single call function, and can realize the flexible switching between the voice call and the general voice communication when the group call and the full call call, and save the design of the EPCF command. The hardware design part of this subject includes the WI-FI telephone terminal, Access Point (AP), Media Gateway Controller (MGC) and Relay Gateway (TGG) are four subsystems. In the functional modules of each subsystem, WI-FI telephone terminal has the same main control module, power module and memory unit module as the media gateway controller, except the CPLD module. It also has WI-FI transmission module, keyboard scanning module of MSP430F149 single chip computer and LCD display module; access point serves as data forwarding center, mainly includes WI-FI transmission module and bottom drive module; relay gateway connects PSTN network and packet network. It is mainly composed of main control module, relay interface module, audio decoding module DTMF forwarding module and busy tone detection module. The software design part includes WI-FI telephone terminal program, access point program and OMGCP protocol. The relay gateway program and UDP/IP protocol are implemented on the CCS 3.3 software development platform, in which the WI-FI telephone terminal, relay gateway and UDP/IP protocol are programmed; on the Keil4.12 platform, the access point program is designed; on the IAR4.10 platform, the access point program is designed. The design of keyboard scan and LCD display subroutine of MSP430F149 single chip microcomputer is realized. On the platform of Quartus 鈪，

本文編號：1539343