Del Campo Antonio, Cintioni Lorenzo, Spinsante Susanna, Gambi Ennio
Dipartimento di Ingegneria dell'Informazione, Università Politecnica delle Marche, Via Brecce Bianche 12, Ancona 60131, Italy.
Sensors (Basel). 2017 Apr 7;17(4):792. doi: 10.3390/s17040792.
With the introduction of low-power wireless technologies, like Bluetooth Low Energy (BLE), new applications are approaching the home automation, healthcare, fitness, automotive and consumer electronics markets. BLE devices are designed to maximize the battery life, i.e., to run for long time on a single coin-cell battery. In typical application scenarios of home automation and Ambient Assisted Living (AAL), the sensors that monitor relatively unpredictable and rare events should coexist with other sensors that continuously communicate health or environmental parameter measurements. The former usually work in connectionless mode, acting as advertisers, while the latter need a persistent connection, acting as slave nodes. The coexistence of connectionless and connection-oriented networks, that share the same central node, can be required to reduce the number of handling devices, thus keeping the network complexity low and limiting the packet's traffic congestion. In this paper, the medium access management, operated by the central node, has been modeled, focusing on the scheduling procedure in both connectionless and connection-oriented communication. The models have been merged to provide a tool supporting the configuration design of BLE devices, during the network design phase that precedes the real implementation. The results highlight the suitability of the proposed tool: the ability to set the device parameters to allow us to keep a practical discovery latency for event-driven sensors and avoid undesired overlaps between scheduled scanning and connection phases due to bad management performed by the central node.
随着低功耗无线技术的引入，如蓝牙低功耗（BLE），新的应用正在进入家庭自动化、医疗保健、健身、汽车和消费电子市场。BLE设备旨在最大限度地延长电池寿命，即在单个纽扣电池上长时间运行。在家庭自动化和环境辅助生活（AAL）的典型应用场景中，监测相对不可预测和罕见事件的传感器应与其他持续通信健康或环境参数测量值的传感器共存。前者通常以无连接模式工作，充当广告商，而后者需要持久连接，充当从节点。共享同一中央节点的无连接网络和面向连接的网络的共存，可能是为了减少处理设备的数量，从而保持网络复杂性较低并限制数据包的流量拥塞。在本文中，对由中央节点操作的介质访问管理进行了建模，重点关注无连接通信和面向连接通信中的调度过程。这些模型已合并，以提供一个工具，在实际实施之前的网络设计阶段支持BLE设备的配置设计。结果突出了所提出工具的适用性：能够设置设备参数，使我们能够为事件驱动传感器保持实际的发现延迟，并避免由于中央节点管理不善而在预定扫描和连接阶段之间出现不希望的重叠。
