Enhanced power saving mode for low-latency communication in multi-hop 802.11 networks
Enhanced power saving mode for low-latency communication in multi-hop 802.11 networks
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DOI：
10.1016/j.adhoc.2014.06.001
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发表时间：
2014-12
期刊：
影响因子：
4.8
通讯作者：
V. Vukadinovic;Ioannis Glaropoulos;S. Mangold
中科院分区：
文献类型：
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作者：
V. Vukadinovic;Ioannis Glaropoulos;S. Mangold
未来的物联网(IoT)将连接数十亿电池供电的无线电设备。它们中的一些可能需要通过多跳链路相互通信并与互联网网关(边界路由器)通信。虽然大多数物联网场景都假设设备为此使用节能的IEEE 802.15.4无线电，但也有一些使用案例倾向于使用IEEE 802.11，尽管其潜在的能耗更高。我们扩展了IEEE 802.11节能模式，该模式允许无线局域网设备进入低功率打盹状态以节省能量，并增加了促进多跳通信的流量通告机制。该方案沿多跳路径传播流量通告，以确保所有中间节点保持唤醒，以最小的延迟接收和转发挂起的数据帧。仿真结果表明，与标准PSM相比，多跳PSM(MH-PSM)在端到端时延和打盹时间方面都有改善，因此可以优化无线局域网以满足物联网设备的组网需求。MH-PSM是实用的和软件可实现的，因为它不需要改变通常在芯片上实现的IEEE 802.11介质访问控制的部分。我们实现了MH-PSM作为Contiki OS的WLAN驱动程序的一部分，Contiki OS是一个针对资源受限的物联网设备的操作系统，我们通过实验证明了它的有效性。
The Future Internet of Things (IoT) will connect billions of battery-powered radio-enabled devices. Some of them may need to communicate with each other and with Internet gateways (border routers) over multi-hop links. While most IoT scenarios assume that for this purpose devices use energy-efficient IEEE 802.15.4 radios, there are use cases where IEEE 802.11 is preferred despite its potentially higher energy consumption. We extend the IEEE 802.11 power saving mode (PSM), which allows WLAN devices to enter a low-power doze state to save energy, with a traffic announcement scheme that facilitates multi-hop communication. The scheme propagates traffic announcements along multi-hop paths to ensure that all intermediate nodes remain awake to receive and forward the pending data frames with minimum latency. Our simulation results show that the proposed Multi-Hop PSM (MH-PSM) improves both end-to-end delay and doze time compared to the standard PSM; therefore, it may optimize WLAN to meet the networking requirements of IoT devices. MH-PSM is practical and software-implementable since it does not require changes to the parts of the IEEE 802.11 medium access control that are typically implemented on-chip. We implemented MH-PSM as a part of a WLAN driver for Contiki OS, which is an operating system for resource-constrained IoT devices, and we demonstrated its efficiency experimentally.