基于IEEE 802.11ah的井下安全监测传感网性能分析
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摘要
针对煤矿井下特殊通信环境对安全监测无线传感网的需求及现有安全监测无线传感网存在接入设备数量和传输距离受限等不足,提出了将IEEE 802.11ah应用于煤矿安全监测无线传感网,并利用NS-3仿真平台对其传输距离、吞吐量、时延、能耗等性能进行了分析。分析结果表明,IEEE 802.11ah的传输距离远大于传统WiFi通信技术,其传输距离为600m时丢包率仍为0;当节点数较少、网络未饱和时,节点竞争信道冲突和碰撞情况并不严重,IEEE 802.11ah在吞吐量、时延、能耗等方面的性能优势并不明显,但在接入节点数众多时,IEEE 802.11ah能很好保证网络的吞吐量、时延、能耗等性能,网络饱和后随着接入节点数的增加,相比传统WiFi通信技术网络性能的持续大幅下降,其网络性能下降幅度更小且渐趋稳定;IEEE 802.11ah网络上行链路数据传输性能与受限访问窗口参数选取有关,准确选取受限访问窗口参数可以更好地发挥基于IEEE 802.11ah的煤矿安全监测无线传感网的性能优势。
In view of need of safety monitoring wireless sensor network in special communication environment of underground coal mine and limitation of access device number and transmission distance of existing safety monitoring wireless sensor network,IEEE 802.11ah was applied to underground safety monitoring wireless sensor network,and NS-3 simulation platform was used to analyze its performances,such as transmission distance,throughput,delay,energy consumption.The analysis results show that the transmission distance of IEEE 802.11ah is much longer than that of traditional WiFi communication technology,and the packet loss rate of IEEE 802.11ah is still 0 when the transmission distance is 600 m.When the number of nodes is small and the network is not saturated,and the channel competition and collision of nodes are not serious,the performance advantages of IEEE 802.11ah in terms of throughput,time delay and energy consumption are not obvious.However,when the number of access nodes is large,IEEE 802.11ah can well guarantee the performances of throughput,time delay,energy consumption.As the number of access nodes increases after network saturated,performance of the traditional WiFi communication technology network continues to drop sharply,performance of IEEE 802.11ah declines less and becomes gradually stable.In addition,performance of IEEE 802.11ah network uplink data transmission is related to selection of restricted access window parameters,accurate selection of restricted access window parameters can better exploit performance advantages of underground safety monitoring wireless sensor network based on IEEE 802.11ah.
In view of need of safety monitoring wireless sensor network in special communication environment of underground coal mine and limitation of access device number and transmission distance of existing safety monitoring wireless sensor network,IEEE 802.11ah was applied to underground safety monitoring wireless sensor network,and NS-3 simulation platform was used to analyze its performances,such as transmission distance,throughput,delay,energy consumption.The analysis results show that the transmission distance of IEEE 802.11ah is much longer than that of traditional WiFi communication technology,and the packet loss rate of IEEE 802.11ah is still 0 when the transmission distance is 600 m.When the number of nodes is small and the network is not saturated,and the channel competition and collision of nodes are not serious,the performance advantages of IEEE 802.11ah in terms of throughput,time delay and energy consumption are not obvious.However,when the number of access nodes is large,IEEE 802.11ah can well guarantee the performances of throughput,time delay,energy consumption.As the number of access nodes increases after network saturated,performance of the traditional WiFi communication technology network continues to drop sharply,performance of IEEE 802.11ah declines less and becomes gradually stable.In addition,performance of IEEE 802.11ah network uplink data transmission is related to selection of restricted access window parameters,accurate selection of restricted access window parameters can better exploit performance advantages of underground safety monitoring wireless sensor network based on IEEE 802.11ah.
引文
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[2]徐寿泉,徐宝平,张阳太,等.煤矿井下无线通信技术的现状与发展[J].工矿自动化,2014,40(9):111-114.XU Shouquan,XU Baoping,ZHANG Yangtai,et al.Current situation of coal mine wireless communication technology and its development[J].Industry and Mine Automation,2014,40(9):111-114.
[3]朱凯.矿井围岩监测无线传感网技术研究[D].北京:中国矿业大学(北京),2015:1-122.
[4]IEEE 802.11ah-2016IEEE standard for information technology-telecommunications and information exchange between systems-local and metropolitan area networks-specific requirements-part 11:wireless LAN medium access control(MAC)and physical layer(PHY)specifications amendment2:Sub 1GHz license exempt operation[S].
[5]KHOROV E,LYAKHOV A,KROTOV A,et al.Asurvey on IEEE 802.11ah:an enabling networking technology for smart cities[J].Computer Communications,2015,58(1):53-69.
[6]MINYOUNG P.IEEE 802.11ah:sub-1-GHz licenseexempt operation for the Internet of things[J].IEEECommunications Magazine,2015,53(9):145-151.
[7]TIAN L,FAMAEY J,LATRS.Evaluation of the IEEE 802.11ah restricted access window mechanism for dense IoT networks[C]//17th International Symposium on a World of Wireless,Mobile and Multimedia Networks,2016:1-9.
[8]TIAN L,DERONNE S,LATRS,et al.Implementation and validation of an IEEE 802.11ah module for NS-3[C]//Proceedings of the Workshop on NS-3,ACM,2016:49-56.
[9]TIAN L,MEHARI M,SANTI S,et al.IEEE 802.11ah restricted access window surrogate model for real-time station grouping[C]//19th International Symposium on a World of Wireless,Mobile and Multimedia Networks,2018:14-22.
[10]ADAME T,BEL A,BELLALTA B,et al.IEEE 802.11ah:the WiFi approach for M2M communications[J].IEEE Wireless Communications,2014,21(6):144-152.
[11]武先利,王鹏,温良,等.一种新型煤矿井下无线通信系统研究[J].工矿自动化,2013,39(8):22-25.WU Xianli,WANG Peng,WEN Liang,et al.Research of a new underground wireless communication system[J].Industry and Mine Automation,2013,39(8):22-25.
[12]秦维阳.矿井安全监测监控系统论述[J].煤炭科技,2017(2):187-189.QIN Weiyang.Discussion on mine safety monitoring and control system[J].Coal Science&Technology Magazine,2017(2):187-189.
[13]宋海鹰.煤矿井下无线通信系统的应用研究[J].山西煤炭,2017,37(3):74-76.SONG Haiying.Application of wireless communication system in mines[J].Shanxi Coal,2017,37(3):74-76.
[14]王泉夫.基于WSN的工作面监控及瓦斯浓度预测关键技术研究[D].徐州:中国矿业大学,2009:1-129.
[15]马磊.无线传感器网络在煤矿井下监测监控系统中的应用[J].无线互联科技,2015(17):22-23.MA Lei.Wireless sensor network application in the coal mine monitoring and control system[J].Wireless Internet Technology,2015(17):22-23.