基于LoRa通信的无线传感网低功耗节点设计

Design of Low-Power WSN Node Based On LoRa

为了降低无线传感器网络节点的功耗,首先对传感器节点的高耗能部分进行合理选型及配置,然后通过分析无线信号在自由空间的传播模型,将功率控制机制引入MAC层,接着对引入功率控制的S-MAC协议的性能进行了仿真,最后在LoRa无线传感器节点上完成了协议的实现。仿真结果表明,改进后的S-MAC协议与A-SMAC和S-MAC相比,分别节约5.5%和10%的能耗。实际测试表明,单个传感器节点覆盖半径可达5km;与固定发射功率方式相比,节点能够根据通信距离动态调整发射功率,降低了能量消耗。

In order to reduce the power consumption of sensor node.Firstly reasonable selecting and configuration of the energy intensive part are taken into consideration.Then power control mechanism is introduced to improve MAC protocol by analysing radio propagation model,and performance is simulated.Finally,the paper implements improved S-MAC protocol based on LoRa communication in sensor nodes.Simulation and experiment results show that the improved S-MAC protocol can save 5.5%and 10%energy when compared with A-SMAC and S-MAC respectively,and the radius of a single node can reach 5 km.Compared to the fixed transmission power mode,the proposed method can dynamically adjust the transmission power according to the communication distance so as to reduce transmission power consumption.