低轨卫星物联网下NB-IoT时延功耗研究
Research on NB-IoT Delay and Power Consumption in LEO Satellite IoT
王凡 1于啸 1洪涛1
作者信息
- 1. 南京邮电大学通信与信息工程学院,南京 210003
- 折叠
摘要
[目的]在低轨(LEO)卫星物联网(IoT)场景下,广域覆盖范围内窄带物联网(NB-IoT)体制终端因为业务场景不同造成时延功耗需求也不相同.然而,地面 NB-IoT体制终端业务场景单一,采用固定式工作状态定时器参数配置方法,无法满足LEO卫星IoT大尺度地理范围内多场景终端时延功耗的不同需求.[方法]针对LEO卫星IoT广覆盖特性,文章基于简化后随机接入交互流程终端工作状态切换的马尔科夫链模型,提出了以系统下行延迟和终端功耗作为非支配排序遗传算法(NS-GA-Ⅱ)的目标函数得到多场景帕累托前沿最优解集的方法,进一步从帕累托前沿中选择满足不同场景时延功耗需求的工作状态定时器参数在线配置终端.[结果]仿真结果表明,文章提出的多目标优化方法对工作状态定时器参数进行全局寻优,克服了穷举法等传统方法可能陷入局部最优的不足,并验证了简化随机接入交互流程可以有效降低终端时延功耗.[结论]文章所提多目标优化方法可以得到终端在LEO卫星IoT多场景下的工作状态定时器参数.
Abstract
[Objective]In the Low Earth Orbit(LEO)satellite Internet of Things(IoT)scenario,the time delay and power con-sumption requirements of Narrowband(NB)-IoT terminal in wide coverage area vary due to different business scenarios.Howev-er,the ground NB-IoT terminal with a single business scenario adopts a fixed working state timer parameter configuration meth-od,which cannot meet the needs of time delay and power consumption for multi-scenario terminals in large geographical areas of LEO satellite IoT.[Methods]In response to the wide coverage characteristics of LEO satellite IoT,the problem of different delay and power consumption requirements for terminal multi-scenario application services in LEO satellite IoT scenarios,this article proposes a method based on a simplified interaction process and Markov chain model for terminal work state switching.The meth-od uses system downlink delay and terminal power consumption as Non-dominated Sorting Genetic Algorithms-Ⅱobjective func-tions to obtain a set of Pareto optimal solutions for multiple scenario frontiers.Furthermore,it selects working state timer parame-ters from the Pareto frontier to configure terminals online that meet different scenario delay and power consumption requirements.[Results]The simulation results show that the multi-objective optimization method proposed in this paper can globally optimize the timing parameters of the working state timer,and overcome the shortcomings of traditional methods such as exhaustive search falling into local optima.Additionally,it has been verified that simplifying the random access interaction process can effectively re-duce terminal delay and power consumption.[Conclusion]The multi-objective optimization method proposed in this paper can ob-tain the working state timer parameters of the terminal in various scenarios of LEO satellite IoT.
关键词
低轨卫星物联网/窄带物联网/时延功耗/多目标优化/工作状态定时器参数Key words
LEO satellite IoT/NB-IoT/delay and power consumption/multi-objective optimization/working state timer pa-rameter引用本文复制引用
基金项目
江苏省前沿引领技术基础研究专项(BK20192002)
国家自然科学基金(62171234)
国家自然科学基金(U21A20450)
国家自然科学基金(61971440)
出版年
2024
国家科技期刊平台
NSTL
万方数据