Implementation of LPWAN over white spaces for practical deployment
Implementation of LPWAN over white spaces for practical deployment
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在空白空间上实施 LPWAN 以进行实际部署
DOI：
10.1145/3302505.3310080
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Abusayeed Saifullah
中科院分区：
文献类型：
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作者：
Mahbubur Rahman;Dali Ismail;V. P. Modekurthy;Abusayeed Saifullah
低功耗广域网（LPWAN）是一种物联网（IoT）技术，支持与众多设备的远距离、低功耗和低成本连接。为了避免在有限的ISM频带（大多数LPWAN在其中操作）中的拥挤和许可频带的成本，最近提出的SNOW（白色空间上的传感器网络）是在TV白色空间上操作的有前途的LPWAN平台。然而，当前的SNOW实现使用USRP设备作为LPWAN节点，其具有高成本（每个设备750美元）和大形状因子，阻碍了该技术在实际部署中的适用性。在本文中，我们实现SNOW使用低成本，低形状因子，低功耗，广泛可用的商业现货（COTS）设备，使其实用和大规模部署。因此，我们选择COTS器件（TI CC1310），将SNOW节点的成本和外形尺寸分别降低了25倍和10倍。在CC1310设备上实现SNOW面临着实现链路可靠性和通信范围的许多挑战。我们的实现通过处理峰均功率比问题、信道估计、载波频率偏移和远近功率问题来解决这些挑战。我们在密歇根州底特律市的部署表明，基于CC1310的SNOW可以在1km的距离上分别实现每个节点11.2kbps和4.8kbps的上行链路和下行链路吞吐量。此外，上行链路中的总吞吐量随着SNOW节点数量的增加而线性增加。
Low-Power Wide-Area Network (LPWAN) is an enabling Internet-of-Things (IoT) technology that supports long-range, low-power, and low-cost connectivity to numerous devices. To avoid the crowd in the limited ISM band (where most LPWANs operate) and the cost of licensed band, the recently proposed SNOW (Sensor Network over White Spaces) is a promising LPWAN platform that operates over the TV white spaces. Nevertheless, the current SNOW implementation uses USRP devices as LPWAN nodes which have high cost ≈ $750 USD per device) and large form-factor, hindering the applicability of this technology in practical deployment. In this paper, we implement SNOW using low-cost, low form-factor, low-power, and widely available commercial off-the-shelf (COTS) devices to enable its practical and large-scale deployment. Our choice of the COTS device (TI CC1310) consequently brings down the cost and the form-factor of a SNOW node by 25x and 10x, respectively. Such implementation of SNOW on CC1310 devices faces a number of challenges to enable link reliability and communication range. Our implementation addresses these challenges by handling peak-to-average power ratio problem, channel estimation, carrier frequency offset, and near-far power problem. Our deployment in the city of Detroit, Michigan demonstrates that CC1310-based SNOW can achieve uplink and downlink throughputs of 11.2kbps and 4.8kbps per node, respectively, over a distance of 1km. Also, the overall throughput in the uplink increases linearly with the increase in the number of SNOW nodes.