With the exponentially increasing number of Internet of Things (IoT) devices and the huge volume of data generated by these devices, there is a pressing need to investigate a more efficient communication method in both frequency and time domains at the edge of IoT networks. In this paper, we present Amphista, a novel cross-layer design for IoT communication and data forwarding that can more efficiently utilize the ever increasingly crowded 2.4 GHz spectrum near the gateway. Specifically, to enable the communication from ZigBee to WiFi, we leverage WiFi’s fine-grained channel state information to extract the concurrently transmitted ZigBee-to-WiFi message from time overlapped ZigBee and WiFi packet. We further leverage this unique feature and design a novel forwarding protocol that can simultaneously forward uplink (e.g., collecting sensing data) and downlink (e.g., disseminating control messages) data by using a single ZigBee data stream. Our extensive experimental results show that Amphista significantly improves throughput (by up to 400x) and reduces the latency.

中文翻译：

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使用单个ZigBee数据流同时进行双向通信和数据转发

随着物联网（IoT）设备的数量呈指数级增长，以及这些设备生成的大量数据，迫切需要研究在IoT网络边缘的频域和时域中更有效的通信方法。在本文中，我们介绍了Amphista，这是一种用于物联网通信和数据转发的新颖跨层设计，可以更有效地利用网关附近日益拥挤的2.4 GHz频谱。具体来说，为了实现从ZigBee到WiFi的通信，我们利用WiFi的细粒度通道状态信息从时间重叠的ZigBee和WiFi数据包中提取同时发送的ZigBee-to-WiFi消息。我们进一步利用这一独特功能，并设计了可以同时转发上行链路的新颖转发协议（例如，通过使用单个ZigBee数据流收集数据和下行链路（例如，分发控制消息）数据。我们广泛的实验结果表明，Amphista可以显着提高吞吐量（最多提高400倍）并减少延迟。