基于能量和频谱共享的传感器网络时延性能分析

采用协同频谱共享和射频能量采集技术后,传感器网络的可用频谱资源和可用能量均受主用户行为约束。为了刻画主用户对传感器网络性能的影响,利用排队理论对基于能量和频谱共享的无线传感器网络时延性能进行建模和分析。首先,通过分析主用户的服务过程和传感器节点的服务过程,推导出了主用户的时延性能。然后,分析了主用户参数对传感器节点服务时间的影响,得到了传感器节点的时延性能,并推导出了Nakagami衰落信道下传感器节点平均时延与系统参数关系的表达式。最后,比较了仿真结果和理论结果,验证了理论分析的正确性,并揭示了网络时延性能与到达率、节点间距离等参数的关系。

The Delay Analysis of the Wireless Sensor Network with Energy and Spectrum Sharing

When adopting the cooperative spectrum sharing and the radio frequency energy harvesting technologies,the available spectrum and energy of the wireless sensor network are constrained by the activity of the primary user. To investigate the influence of the primary user on the performance of the wireless sensor network,a method is proposed to analyze the delay performance of the system with spectrum and energy sharing,by using the queue theory. First,through analyzing the service processes of both the primary user and the sensor,the delay performance of the primary user is derived. Then,by studying the influence of the parameter of the primary user on the service time of the sensor,the delay performance of the sensor is obtained. Meanwhile,the expression of the average delay of the system over the Nakagami channel is also derived. At last,by comparing the simulation and the theory results,the accuracy of the analysis is verified. The results also illustrate the relationship between the delay performance and the system parameters,such as the traffic arrival rate,the distance between nodes,and etc.