Radio coverage directly affects the network connectivity, which is the foundational issue to ensure the normal operation of the network. Many efforts have been made to estimate the radio coverage of sensor nodes. The ...Radio coverage directly affects the network connectivity, which is the foundational issue to ensure the normal operation of the network. Many efforts have been made to estimate the radio coverage of sensor nodes. The existing approaches (often RSSI measurement-based), however, suffer from heavy measurement cost and are not well suitable for the large-scale densely deployed WSNs. NRC-Map, a novel algorithm is put forward for sensor nodes radio coverage mapping. The algorithm is based on the RSSI values collected by the neighbor nodes. According to the spatial relationship, neighbor nodes are mapping to several overlapped sectors. By use of the least squares fitting method, a log-distance path loss model is established for each sector. Then, the max radius of each sector is computed according to the path loss model and the given signal attenuation threshold. Finally, all the sectors are overlapped to estimate the node radio coverage. Experimental results show that the method is simple and effectively improve the prediction accuracy of the sensor node radio coverage.展开更多
针对机舱无线通信覆盖不全面、速度慢、不稳定等问题,该文基于射线跟踪方法构建了机舱环境第5代移动通信技术(5th generation mobile communication technology,5G)信道模型,并分析了信号覆盖能力及信道参数特性。首先,利用三角面元对...针对机舱无线通信覆盖不全面、速度慢、不稳定等问题,该文基于射线跟踪方法构建了机舱环境第5代移动通信技术(5th generation mobile communication technology,5G)信道模型,并分析了信号覆盖能力及信道参数特性。首先,利用三角面元对真实的机舱环境进行三维几何重构,以降低射线跟踪方法获取信道参数的复杂度;然后,结合分簇算法构建5G信道传播模型,进而分析了机舱环境下5G信号覆盖和通信性能。仿真分析结果表明,簇功率偏移和簇时延偏移服从高斯分布,簇到达方位角和簇到达俯仰角偏移服从拉普拉斯分布,同时发现,机舱环境中的密集散射体是影响5G信号覆盖范围的关键因素。上述结论可用于机舱环境5G基站的无线通信信号覆盖预测和多径参数评估等领域。展开更多
The rapid development of communications industry has spawned more new services and applications.The sixth-generation wireless communication system(6G)network is faced with more stringent and diverse requirements.While...The rapid development of communications industry has spawned more new services and applications.The sixth-generation wireless communication system(6G)network is faced with more stringent and diverse requirements.While ensuring performance requirements,such as high data rate and low latency,the problem of high energy consumption in the fifth-generation wireless communication system(5G)network has also become one of the problems to be solved in 6G.The wide-area coverage signaling cell technology conforms to the future development trend of radio access networks,and has the advantages of reducing network energy consumption and improving resource utilization.In wide-area coverage signaling cells,on-demand multi-dimensional resource allocation is an important technical means to ensure the ultimate performance requirements of users,and its effect will affect the efficiency of network resource utilization.This paper constructs a user-centric dynamic allocation model of wireless resources,and proposes a deep Q-network based dynamic resource allocation algorithm.The algorithm can realize dynamic and flexible admission control and multi-dimensional resource allocation in wide-area coverage signaling cells according to the data rate and latency demands of users.According to the simulation results,the proposed algorithm can effectively improve the average user experience on a long time scale,and ensure network users a high data rate and low energy consumption.展开更多
3GPP在版本16(R16,Release 16)中升级了最小化路测(MDT,minimization of drive test)技术,提出移动终端可利用4G/5G网络自主上报Wi-Fi信号的接收信号强度指示(RSSI,received signal strength indicator),为运营商度量Wi-Fi网络的覆盖率...3GPP在版本16(R16,Release 16)中升级了最小化路测(MDT,minimization of drive test)技术,提出移动终端可利用4G/5G网络自主上报Wi-Fi信号的接收信号强度指示(RSSI,received signal strength indicator),为运营商度量Wi-Fi网络的覆盖率带来了可能性。然而,现有基于MDT技术的网络覆盖度量方法严重依赖GPS提供的位置坐标,但全球定位系统(GPS,global positioning system)不能提供室内精准定位,无法用于室内Wi-Fi网络的覆盖度量。为此,提出了一种不依赖位置坐标的RSSI聚类方法,充分利用室内相近位置RSSI的统计相似性,区分不同位置的RSSI测量差异,在无位置坐标条件下准确估计出室内Wi-Fi网络的覆盖率。实验结果表明,所提方法估计的覆盖率与基于真实位置坐标测量的覆盖率相近,度量准确度明显优于现有的其他方法。展开更多
广播电视覆盖工程是指通过建设发射、传输、接收等设施,将广播电视信号送达目标区域的工程,对于提高广播电视覆盖率、促进信息传播具有重要意义。首先介绍广播电视覆盖工程的概念和发展历程,其次分析广播电视覆盖工程应用的技术,包括数...广播电视覆盖工程是指通过建设发射、传输、接收等设施,将广播电视信号送达目标区域的工程,对于提高广播电视覆盖率、促进信息传播具有重要意义。首先介绍广播电视覆盖工程的概念和发展历程,其次分析广播电视覆盖工程应用的技术,包括数字信号处理技术(Digital Signal Processing,DSP)、卫星传输技术及互联网协议电视(Internet Protocol Television,IPTV)技术等,最后介绍具体案例,希望为广播电视覆盖工程的技术应用提供借鉴。展开更多
文摘Radio coverage directly affects the network connectivity, which is the foundational issue to ensure the normal operation of the network. Many efforts have been made to estimate the radio coverage of sensor nodes. The existing approaches (often RSSI measurement-based), however, suffer from heavy measurement cost and are not well suitable for the large-scale densely deployed WSNs. NRC-Map, a novel algorithm is put forward for sensor nodes radio coverage mapping. The algorithm is based on the RSSI values collected by the neighbor nodes. According to the spatial relationship, neighbor nodes are mapping to several overlapped sectors. By use of the least squares fitting method, a log-distance path loss model is established for each sector. Then, the max radius of each sector is computed according to the path loss model and the given signal attenuation threshold. Finally, all the sectors are overlapped to estimate the node radio coverage. Experimental results show that the method is simple and effectively improve the prediction accuracy of the sensor node radio coverage.
文摘针对机舱无线通信覆盖不全面、速度慢、不稳定等问题,该文基于射线跟踪方法构建了机舱环境第5代移动通信技术(5th generation mobile communication technology,5G)信道模型,并分析了信号覆盖能力及信道参数特性。首先,利用三角面元对真实的机舱环境进行三维几何重构,以降低射线跟踪方法获取信道参数的复杂度;然后,结合分簇算法构建5G信道传播模型,进而分析了机舱环境下5G信号覆盖和通信性能。仿真分析结果表明,簇功率偏移和簇时延偏移服从高斯分布,簇到达方位角和簇到达俯仰角偏移服从拉普拉斯分布,同时发现,机舱环境中的密集散射体是影响5G信号覆盖范围的关键因素。上述结论可用于机舱环境5G基站的无线通信信号覆盖预测和多径参数评估等领域。
基金Project supported by the National Key Research and Development Program of China(No.2020YFB1806800)。
文摘The rapid development of communications industry has spawned more new services and applications.The sixth-generation wireless communication system(6G)network is faced with more stringent and diverse requirements.While ensuring performance requirements,such as high data rate and low latency,the problem of high energy consumption in the fifth-generation wireless communication system(5G)network has also become one of the problems to be solved in 6G.The wide-area coverage signaling cell technology conforms to the future development trend of radio access networks,and has the advantages of reducing network energy consumption and improving resource utilization.In wide-area coverage signaling cells,on-demand multi-dimensional resource allocation is an important technical means to ensure the ultimate performance requirements of users,and its effect will affect the efficiency of network resource utilization.This paper constructs a user-centric dynamic allocation model of wireless resources,and proposes a deep Q-network based dynamic resource allocation algorithm.The algorithm can realize dynamic and flexible admission control and multi-dimensional resource allocation in wide-area coverage signaling cells according to the data rate and latency demands of users.According to the simulation results,the proposed algorithm can effectively improve the average user experience on a long time scale,and ensure network users a high data rate and low energy consumption.
文摘3GPP在版本16(R16,Release 16)中升级了最小化路测(MDT,minimization of drive test)技术,提出移动终端可利用4G/5G网络自主上报Wi-Fi信号的接收信号强度指示(RSSI,received signal strength indicator),为运营商度量Wi-Fi网络的覆盖率带来了可能性。然而,现有基于MDT技术的网络覆盖度量方法严重依赖GPS提供的位置坐标,但全球定位系统(GPS,global positioning system)不能提供室内精准定位,无法用于室内Wi-Fi网络的覆盖度量。为此,提出了一种不依赖位置坐标的RSSI聚类方法,充分利用室内相近位置RSSI的统计相似性,区分不同位置的RSSI测量差异,在无位置坐标条件下准确估计出室内Wi-Fi网络的覆盖率。实验结果表明,所提方法估计的覆盖率与基于真实位置坐标测量的覆盖率相近,度量准确度明显优于现有的其他方法。
文摘广播电视覆盖工程是指通过建设发射、传输、接收等设施,将广播电视信号送达目标区域的工程,对于提高广播电视覆盖率、促进信息传播具有重要意义。首先介绍广播电视覆盖工程的概念和发展历程,其次分析广播电视覆盖工程应用的技术,包括数字信号处理技术(Digital Signal Processing,DSP)、卫星传输技术及互联网协议电视(Internet Protocol Television,IPTV)技术等,最后介绍具体案例,希望为广播电视覆盖工程的技术应用提供借鉴。
