面向高吞吐量的NB‒IoT低轨卫星物联网资源调度

NB-IoT low-orbit satellite IoT resource scheduling for high throughput

摘要:

窄带物联网(NB-IoT)作为一种低功耗广域网技术，专门设计用于连接大量低功耗设备。基于该技术的低轨卫星物联网有着较低的传输损耗和时延，并且可以通过星座方式对地球实现无缝覆盖。然而，低轨卫星具有高度动态性，并且面临来自不同用户的QoS需求，这些因素使得现有资源调度算法的吞吐量性能受到了极大的影响。针对这些挑战，本文在海量物联网用户请求无线资源且时频资源有限的场景下，综合考虑卫星信道特性、不同用户间的可靠性与时延要求以及卫星高动态性引起的差分多普勒等因素，提出了一种面向高吞吐量的NB-IoT低轨卫星物联网资源调度算法。仿真结果表明，相比现有方法，提出的资源调度算法在系统吞吐量方面表现出显著的性能提升。

Abstract:

Narrow Band Internet of Things(NB-IoT), as a low-power wide area network technology, is specially designed to connect a large number of low-power devices. The low-orbit satellite IoT based on this technology has lower transmission loss and delay, and can achieve seamless coverage of the earth through constellations. However, low-orbit satellites are highly dynamic and face QoS requirements from different users. These factors greatly affect the throughput performance of existing resource scheduling algorithms. In response to these challenges, this paper proposes a high-throughput NB-IoT low-orbit satellite IoT resource scheduling algorithm by comprehensively considering satellite channel characteristics, reliability and delay requirements between different users, and differential Doppler caused by high satellite dynamics in a scenario where a large number of IoT users request wireless resources and time-frequency resources are limited. Simulation results show that compared with existing methods, the resource scheduling algorithm proposed in this paper shows significant performance improvement in system throughput.