处理低功耗广域网中的移动性
Handling Mobility in Low-Power Wide-Area Network
摘要：
尽管移动设备在各种广域物联网应用（例如，智能城市、智能农业），当前的低功率广域网（LPWAN）没有被设计为有效地支持移动节点。在本文中，我们建议处理移动性在雪（传感器网络在白色空间），一个LPWAN，在电视白色空间。SNOW通过OFDM的分布式实现支持基站（BS）和众多低功率节点之间的大规模并发通信。在SNOW中，由于其基于OFDM的设计，载波间干扰（ICI）在移动性下更加明显。空白空间的地理空间变化也提出了网络内和网络间移动性的挑战，因为低功率节点没有配备确定空白空间。为了处理移动性对ICI的影响，我们提出了一种动态载波频率偏移估计和补偿技术，该技术考虑到多普勒频移，而不需要知道节点的速度。我们还建议规避移动性的影响，通过移动感知频谱分配给节点的地理空间变化的白色空间。为了使不同的SNOW的节点的移动性，我们提出了一个有效的切换管理，通过一个快速和节能的BS发现和快速关联的BS结合时间和频域能量感测。通过在大都市和室内的SNOW部署的实验表明，我们提出的方法使多个不同的SNOW之间的移动性，并提供可靠性，延迟和移动下的能源消耗方面的鲁棒性。
英文摘要：
Despite the proliferation of mobile devices in various wide-area Internet of Things applications (e.g., smart city, smart farming), current Low-Power Wide-Area Networks (LPWANs) are not designed to effectively support mobile nodes. In this paper, we propose to handle mobility in SNOW (Sensor Network Over White spaces), an LPWAN that operates in the TV white spaces. SNOW supports massive concurrent communication between a base station (BS) and numerous low-power nodes through a distributed implementation of OFDM. In SNOW, inter-carrier interference (ICI) is more pronounced under mobility due to its OFDM based design. Geospatial variation of white spaces also raises challenges in both intra- and inter-network mobility as the low-power nodes are not equipped to determine white spaces. To handle mobility impacts on ICI, we propose a dynamic carrier frequency offset estimation and compensation technique which takes into account Doppler shifts without requiring to know the speed of the nodes. We also propose to circumvent the mobility impacts on geospatial variation of white space through a mobility-aware spectrum assignment to nodes. To enable mobility of the nodes across different SNOWs, we propose an efficient handoff management through a fast and energy-efficient BS discovery and quick association with the BS by combining time and frequency domain energy-sensing. Experiments through SNOW deployments in a large metropolitan city and indoors show that our proposed approaches enable mobility across multiple different SNOWs and provide robustness in terms of reliability, latency, and energy consumption under mobility.
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。
