Transmit Power Allocation Schemes for Performance Improvement of Poor Conditioned End Devices in LPWAN

Abstract

This paper studies the performance improvement of end devices with a low received signal strength indicator, that is, the poor condition, in general low power wide area networks (LPWANs). To improve the performance, we discuss the transmit power allocation utilizing the benefit of the capture effect, which results in an advantage depending on the signal-to-noise ratio and signal-to-interference ratio at each end device. However, the benefit of the capture effect cannot be realized simultaneously in all end devices owing to its characteristics. To avoid performance degradation of the specific end devices that are unable to realize the benefit of the capture effect, we propose transmit power allocation schemes. In the proposed technique, two types of allocated transmit power, which are designed in conjunction with each other, are used alternately in time. Numerical examples validate the effectiveness of the proposed technique.