Persistent Periodic Uplink Scheduling Algorithm for Massive NB-IoT Devices

Sensors

Chia-Yiu Lin¹  Abhishek Vyas¹  Chi-Ruei Huang¹  Ren-Hung Hwang¹  Tin-Yu Wu² 

[1] Computer Science and Information Engineering Department, National Chung Cheng University, Chiayi 621301, Taiwan;Management Information Systems Department, National Pingtung University of Science and Technology, Pingtung 912301, Taiwan;

关键词: 5G;    NB-IoT;    uplink scheduling;    resource units;    power saving mechanism;    NPUSCH;   

DOI  :  10.3390/s22082875

来源: DOAJ

【 摘 要 】

Narrowband Internet of Things (NB-IoT) is one of the low-power wide-area network (LPWAN) technologies that aim to support enormous connections, featuring wide-area coverage, low power consumption, and low costs. NB-IoT could serve a massive number of IoT devices, but with very limited radio resources. Therefore, how to enable a massive number of IoT devices to transmit messages periodically, and with low latency, according to transmission requirements, has become the most crucial issue of NB-IoT. Moreover, IoT devices are designed to minimize power consumption so that the device battery can last for a long time. Similarly, the NB-IoT system must configure different power-saving mechanisms for different types of devices to prolong their battery lives. In this study, we propose a persistent periodic uplink scheduling algorithm (PPUSA) to assist a plethora of Internet of Things (IoT) devices in reporting their sensing data based on their sensing characteristics. PPUSA explicitly considers the power-saving mode and connection suspend/resume procedures to reduce the IoT device’s power consumption and processing overhead. PPUSA allocates uplink resource units to IoT devices systematically so that it can support the periodic–uplink transmission of a plethora of IoT devices while maintaining low transmission latency for bursty data. The simulation results show that PPUSA can support up to 600,000 IoT devices when the NB-IoT uplink utilization is 80%. In addition, it takes only one millisecond for the transmission of the bursty messages.

【 授权许可】

Unknown