本文關(guān)鍵詞： WLAN VoIP H.323 SIP WinCE操作系統(tǒng) DCF EDCF　出處：《北京交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)的飛速發(fā)展和大數(shù)據(jù)時(shí)代的到來(lái),人們?cè)絹?lái)越重視信息交流的實(shí)時(shí)性和跨地域性,而以互聯(lián)網(wǎng)為載體的多媒體語(yǔ)音通信業(yè)務(wù)正成為時(shí)下的研究熱點(diǎn)。VoWLAN(Voice over WLAN)是一個(gè)結(jié)合了VoIP(Voice over IP)和WLAN(無(wú)線局域網(wǎng))的新的發(fā)展方向,它涵蓋了無(wú)線通信技術(shù)、計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)和嵌入式系統(tǒng)化開發(fā)等多個(gè)領(lǐng)域的前沿科學(xué)。VoIP通過(guò)網(wǎng)絡(luò)傳輸語(yǔ)音信號(hào),WLAN使終端設(shè)備通過(guò)無(wú)線接入點(diǎn)進(jìn)行上網(wǎng),這兩者的有機(jī)結(jié)合可以利用現(xiàn)有的WLAN網(wǎng)絡(luò)實(shí)現(xiàn)無(wú)線VoIP通話能力,這樣在節(jié)約通信成本的同時(shí)又提高了網(wǎng)絡(luò)資源的使用效率。本課題主要目標(biāo)是設(shè)計(jì)并實(shí)現(xiàn)一款基于WLAN的VoIP語(yǔ)音通信終端設(shè)備,利用現(xiàn)有的WLAN網(wǎng)絡(luò)實(shí)現(xiàn)VoIP語(yǔ)音無(wú)線通話功能,用戶可以通過(guò)VoIP語(yǔ)音終端設(shè)備在WLAN網(wǎng)絡(luò)覆蓋范圍內(nèi)隨時(shí)進(jìn)行語(yǔ)音業(yè)務(wù)的注冊(cè)、呼叫、掛斷和應(yīng)答等基本操作；同時(shí)針對(duì)現(xiàn)場(chǎng)的工業(yè)級(jí)應(yīng)用,開發(fā)了更加具有針對(duì)性的組呼和設(shè)備控制特色功能；其次,基于NS2網(wǎng)絡(luò)仿真平臺(tái),研究適用于本終端的MAC層隨機(jī)接入?yún)f(xié)議,保障語(yǔ)音業(yè)務(wù)在整個(gè)WLAN數(shù)據(jù)、語(yǔ)音、視頻業(yè)務(wù)中的服務(wù)質(zhì)量(QoS)；最后通過(guò)仿真模擬和實(shí)際測(cè)試驗(yàn)證VoIP語(yǔ)音終端基本功能和組呼、設(shè)備控制功能的有效性和可靠性。本文首先介紹課題的研究背景及意義、課題的國(guó)內(nèi)外研究狀況和研究目標(biāo),分別闡述WLAN和VoIP的基本概況并對(duì)VoIP兩大體系協(xié)議SIP和H.323做了對(duì)比分析,隨后對(duì)本文的核心協(xié)議SIP從功能、特征等方面進(jìn)行了詳細(xì)的理論介紹；其次,本文進(jìn)行了VoIP語(yǔ)音終端的總體設(shè)計(jì),包括系統(tǒng)的設(shè)計(jì)目標(biāo)和設(shè)計(jì)原則以及軟硬件平臺(tái)環(huán)境,其中對(duì)VoIP語(yǔ)音終端的硬件設(shè)計(jì)主要包括核心處理器模塊、存儲(chǔ)器模塊,電源、音頻、JTAG等外圍模塊,軟件設(shè)計(jì)主要包括SIP協(xié)議棧oSIP的基本功能模塊：解析器模塊、狀態(tài)機(jī)模塊和工具模塊,VoIP語(yǔ)音終端核心模塊：語(yǔ)音處理模塊、數(shù)據(jù)傳輸模塊、組呼功能模塊、設(shè)備控制模塊和用戶交互模塊,以及應(yīng)用程序的代碼分析和實(shí)現(xiàn)方法；再次,對(duì)WLAN的MAC層接入機(jī)制DCF、EDCF進(jìn)行了理論介紹并模擬系統(tǒng)網(wǎng)絡(luò)架構(gòu)完成了QoS性能仿真,仿真結(jié)果表明EDCF機(jī)制在網(wǎng)絡(luò)負(fù)載逐漸增大的情況下可以提供更好的QoS；最后,搭建了基本測(cè)試環(huán)境,對(duì)VoIP語(yǔ)音終端的核心功能：注冊(cè)、呼叫、掛斷、應(yīng)答、組呼和設(shè)備控制進(jìn)行了有效性和穩(wěn)定性測(cè)試。
[Abstract]:With the rapid development of computer network technology and the arrival of big data era, people pay more and more attention to real-time and cross-regional information exchange. And the multimedia voice communication service based on the Internet is becoming the research hotspot. VoWLAN Voice over WLAN is a combination of VoIP (. Voice over IP) and WLAN (wireless local area network) new development direction. It covers the wireless communication technology, computer network technology and embedded systematic development and other areas of the forefront of science. VoIP over the network to transmit voice signals. WLAN enables terminal devices to access the Internet through wireless access points. The combination of the two can make use of the existing WLAN network to achieve wireless VoIP communication capability. This saves the cost of communication and improves the efficiency of network resources. The main goal of this project is to design and implement a VoIP voice communication terminal equipment based on WLAN. Using the existing WLAN network to realize the VoIP voice wireless call function, the user can register and call voice services at any time through the VoIP voice terminal equipment in the WLAN network coverage area. Basic operations such as hanging up and answering; At the same time, aiming at the industrial application in the field, a more targeted function of group call and equipment control is developed. Secondly, based on the NS2 network simulation platform, the MAC layer random access protocol which is suitable for this terminal is studied to ensure the QoS of voice service in the whole WLAN data, voice and video service. Finally, the effectiveness and reliability of the basic function of VoIP voice terminal and the function of group call and equipment control are verified by simulation and actual test. Firstly, the research background and significance of this paper are introduced. The domestic and foreign research status and research objectives of the topic, respectively, the basic situation of WLAN and VoIP, and VoIP two major system protocols SIP and H.323 are compared and analyzed. Then, the paper introduces the core protocol SIP in detail from the aspects of function, feature and so on. Secondly, this paper carries on the overall design of VoIP voice terminal, including the design goal and design principle of the system, as well as the software and hardware platform environment. The hardware design of VoIP voice terminal mainly includes the core processor module, memory module, power supply, audio JTAG and other peripheral modules. The software design mainly includes the basic function modules of SIP protocol stack oSIP: parser module, state machine module and tool module VoIP voice terminal core module: voice processing module, data transmission module. A group call function module, a device control module and a user interaction module, as well as a code analysis and implementation method of the application program; Thirdly, the MAC layer access mechanism of WLAN is introduced theoretically and the QoS performance simulation is completed by simulating the system network architecture. Simulation results show that the EDCF mechanism can provide better QoS when the network load increases gradually. Finally, the basic test environment is built, and the effectiveness and stability of the core functions of VoIP voice terminal, such as registration, call, hang up, response, group call and equipment control, are tested.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN916.5;TN925.93

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