arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.09455cs.NI
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NB-IoT覆盖增强方法的评估、建模与优化

Evaluation, Modeling and Optimization of Coverage Enhancement Methods of NB-IoT

Sahithya Ravi, Pouria Zand, Mohieddine El Soussi, Majid Nabi

摘要:

窄带物联网(NB-IoT)是3GPP发布的一种新的低功耗广域网(LPWAN)技术。NB-IoT的主要目标是改善覆盖范围,大容量,低成本和长电池寿命。为了提高覆盖范围,NB-IoT有很有前途的解决方案,例如增加传输重复次数,降低带宽以及调整调制和编码方案(MCS)。在本文中,我们提出了在端到端网络模拟器NS-3中实现NB-IoT的覆盖增强功能。NS-3中的资源分配和链路自适应被修改以符合NB-IoT的新特征。使用开发的仿真框架,网络的可靠性和延迟的新功能的影响进行评估。此外,提出了一种基于所有三个特征的最优混合链路自适应策略。为了实现这一点,我们制定了一个优化问题,该问题具有基于延迟的目标函数和基于信噪比(SNR)的约束。然后,我们提出了几种算法,以尽量减少延迟,并比较它们的准确性和速度。选择最佳的混合解决方案,并在NS-3仿真器中实现,通过该延迟公式进行验证。数值结果表明,所提出的优化算法的混合链路自适应是8倍的速度比穷举搜索方法,并产生类似的延迟。

英文摘要:

Narrowband Internet of Things (NB-IoT) is a new Low Power Wide Area Network (LPWAN) technology released by 3GPP. The primary goals of NB-IoT are improved coverage, massive capacity, low cost, and long battery life. In order to improve coverage, NB-IoT has promising solutions, such as increasing transmission repetitions, decreasing bandwidth, and adapting the Modulation and Coding Scheme (MCS). In this paper, we present an implementation of coverage enhancement features of NB-IoT in NS-3, an end-to-end network simulator. The resource allocation and link adaptation in NS-3 are modified to comply with the new features of NB-IoT. Using the developed simulation framework, the influence of the new features on network reliability and latency is evaluated. Furthermore, an optimal hybrid link adaptation strategy based on all three features is proposed. To achieve this, we formulate an optimization problem that has an objective function based on latency, and constraint based on the Signal to Noise Ratio (SNR). Then, we propose several algorithms to minimize latency and compare them with respect to accuracy and speed. The best hybrid solution is chosen and implemented in the NS-3 simulator by which the latency formulation is verified. The numerical results show that the proposed optimization algorithm for hybrid link adaptation is eight times faster than the exhaustive search approach and yields similar latency.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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