This paper presents a CDA mechanism to simultaneously coordinate data dissemination and data aggregation services in coexisting heterogeneous IoT networks (i.e., WiFi and ZigBee) using a WiFi Access Point (AP). With CDA, the WiFi signal interference to the low power ZigBee network is mitigated via the latest Cross-Technology Communication (CTC) techniques. The CTC techniques used in CDA are compatible with existing commodity IoT devices, which requires no hardware modification when implementing CDA. Specifically, the individual network status (e.g., duty cycle information) is first exchanged between different networks via CTC. Accordingly, the AP dynamically schedules its channel occupation time based on the communication demand and network status of both networks. Furthermore, a theoretical guidance is provided for the duty cycle control of the ZigBee network in coexisting scenarios, which guarantees the aggregation performance and extends the network's life-time. The proposed CDA mechanism is evaluated through a real-world testbed consisting of 2 WiFi devices and 40 ZigBee nodes. Experimental results show that CDA not only optimizes the ZigBee network's delay and life-time by 3.72 × and 1.24 × , respectively, but also improves the WiFi throughput by 1.94 × .

本文提出了一种CDA机制，可使用WiFi接入点（AP）在并存的异构IoT网络（即WiFi和ZigBee）中同时协调数据分发和数据聚合服务。使用CDA，可通过最新的跨技术通信（CTC）技术减轻WiFi信号对低功率ZigBee网络的干扰。CDA中使用的CTC技术与现有的商用物联网设备兼容，在实施CDA时不需要进行硬件修改。具体地，首先经由CTC在不同网络之间交换各个网络状态（例如，占空比信息）。因此，AP基于两个网络的通信需求和网络状态动态地调度其信道占用时间。此外，在共存场景中为ZigBee网络的占空比控制提供了理论指导，从而保证了聚合性能并延长了网络的使用寿命。通过由2个WiFi设备和40个ZigBee节点组成的真实测试平台，可以评估所提出的CDA机制。实验结果表明，CDA不仅使ZigBee网络的延迟和生存时间分别优化了3.72×和1.24×，而且还将WiFi吞吐量提高了1.94×。