礦井WLAN終端設(shè)計(jì)及其漫游切換技術(shù)研究
發(fā)布時(shí)間：2018-10-09 10:34
【摘要】：隨著煤礦信息化工作的不斷推進(jìn),作為礦井有線通信網(wǎng)絡(luò)的補(bǔ)充,無線網(wǎng)絡(luò)在煤礦中的應(yīng)用正逐步深入。在煤礦井下視頻監(jiān)控領(lǐng)域,傳統(tǒng)有線視頻監(jiān)控系統(tǒng)由于缺乏移動(dòng)性且在施工時(shí)存在大量的布線,已不能滿足諸如移動(dòng)目標(biāo)監(jiān)控及巡檢等不便或無法使用有線視頻監(jiān)控的場合。采用有線結(jié)合無線的通信方式實(shí)現(xiàn)井下網(wǎng)絡(luò)信號無縫覆蓋,是今后煤礦井下通信系統(tǒng)的發(fā)展趨勢。然而,由于無線局域網(wǎng)接入點(diǎn)的網(wǎng)絡(luò)信號覆蓋范圍有限,用戶只能在其通信范圍內(nèi)自由移動(dòng)。當(dāng)用戶漫游至不同AP覆蓋小區(qū)時(shí),為防止通信中斷,必然發(fā)生網(wǎng)絡(luò)切換過程。此過程將產(chǎn)生相應(yīng)的時(shí)延,假如時(shí)延過長,會(huì)明顯影響到對實(shí)時(shí)性敏感類業(yè)務(wù)的通信質(zhì)量。因此,如何縮短WLAN網(wǎng)絡(luò)切換時(shí)延一直是人們研究的課題方向。本文圍繞礦井WLAN終端設(shè)計(jì)及其漫游切換技術(shù)研究做了如下工作:(1)對礦井移動(dòng)視頻監(jiān)控終端的實(shí)現(xiàn)所涉及的關(guān)鍵技術(shù)的研究。系統(tǒng)地分析了IEEE802.11網(wǎng)絡(luò)切換發(fā)起條件和切換過程。分析了當(dāng)前學(xué)者們對于提高切換性能做出的研究,并結(jié)合本文的研究背景探討可行的改進(jìn)方向。(2)完成基于WLAN技術(shù)的礦井移動(dòng)視頻監(jiān)控終端的硬件設(shè)計(jì)。包括處理器、Wi-Fi模塊的選擇,視頻采集模塊、FLASH接口電路、SDRAM接口電路、DM9000以太網(wǎng)卡接口電路等外圍接口電路的設(shè)計(jì)。(3)搭建紹嵌入式開發(fā)環(huán)境的,完成U-Boot的移植,完成根文件系統(tǒng)制作及Linux內(nèi)核移植及主要驅(qū)動(dòng)配置。(4)針對礦井特殊應(yīng)用背景,通過分析傳統(tǒng)IEEE802.11切換決策算法的特點(diǎn),結(jié)合背景掃描的思想對漫游切換算法進(jìn)行了有效的改進(jìn),提高了切換性能,保證切換過程的可靠性和有效性。搭建井下現(xiàn)場實(shí)驗(yàn)平臺(tái),驗(yàn)證理論分析結(jié)果。
[Abstract]:With the development of coal mine informatization, as a supplement of mine wired communication network, the application of wireless network in coal mine is deepening step by step. In the field of underground video surveillance in coal mine, the traditional wired video surveillance system is unable to meet the inconvenience or the use of wired video surveillance, such as moving target monitoring and patrol inspection, because of the lack of mobility and a large number of cabling during construction. It is the development trend of underground communication system in the future to use wired and wireless communication mode to realize seamless coverage of underground network signal. However, due to the limited coverage of WLAN access points, users can only move freely within their communication range. When the user roams to different AP coverage cells, in order to prevent the interruption of communication, the network switching process is inevitable. If the delay is too long, the communication quality of real-time sensitive services will be obviously affected. Therefore, how to shorten the handoff delay in WLAN networks has been the research direction. This paper focuses on the design of mine WLAN terminal and the research of roaming switching technology. (1) the key technologies involved in the realization of mine mobile video surveillance terminal are studied. The initiation conditions and handoff process of IEEE802.11 network are analyzed systematically. This paper analyzes the current research on improving the performance of handoff, and discusses the feasible direction of improvement. (2) the hardware design of mine mobile video monitoring terminal based on WLAN technology is completed. It includes the selection of processor / Wi-Fi module, video acquisition module flash interface circuit, SDRAM interface circuit, DM9000 Ethernet card interface circuit and other peripheral interface circuits. (3) to build an embedded development environment, complete the transplant of U-Boot, The root file system is made, the Linux kernel is transplanted and the main driving configuration is configured. (4) according to the special application background of mine, by analyzing the characteristics of the traditional IEEE802.11 switching decision algorithm and combining the idea of background scanning, the roaming switching algorithm is improved effectively. The switching performance is improved, and the reliability and effectiveness of the handover process are ensured. Build the underground field experiment platform to verify the theoretical analysis results.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD655;TN925.93
本文編號：2259015
[Abstract]:With the development of coal mine informatization, as a supplement of mine wired communication network, the application of wireless network in coal mine is deepening step by step. In the field of underground video surveillance in coal mine, the traditional wired video surveillance system is unable to meet the inconvenience or the use of wired video surveillance, such as moving target monitoring and patrol inspection, because of the lack of mobility and a large number of cabling during construction. It is the development trend of underground communication system in the future to use wired and wireless communication mode to realize seamless coverage of underground network signal. However, due to the limited coverage of WLAN access points, users can only move freely within their communication range. When the user roams to different AP coverage cells, in order to prevent the interruption of communication, the network switching process is inevitable. If the delay is too long, the communication quality of real-time sensitive services will be obviously affected. Therefore, how to shorten the handoff delay in WLAN networks has been the research direction. This paper focuses on the design of mine WLAN terminal and the research of roaming switching technology. (1) the key technologies involved in the realization of mine mobile video surveillance terminal are studied. The initiation conditions and handoff process of IEEE802.11 network are analyzed systematically. This paper analyzes the current research on improving the performance of handoff, and discusses the feasible direction of improvement. (2) the hardware design of mine mobile video monitoring terminal based on WLAN technology is completed. It includes the selection of processor / Wi-Fi module, video acquisition module flash interface circuit, SDRAM interface circuit, DM9000 Ethernet card interface circuit and other peripheral interface circuits. (3) to build an embedded development environment, complete the transplant of U-Boot, The root file system is made, the Linux kernel is transplanted and the main driving configuration is configured. (4) according to the special application background of mine, by analyzing the characteristics of the traditional IEEE802.11 switching decision algorithm and combining the idea of background scanning, the roaming switching algorithm is improved effectively. The switching performance is improved, and the reliability and effectiveness of the handover process are ensured. Build the underground field experiment platform to verify the theoretical analysis results.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD655;TN925.93
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