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600 m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。
Abstract:
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.
百度学术
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