| Summary: | This study aims to develop a system of device-to-device (D2D) communications for information collection, distribution and sharing among local communities. It establishes a D2D testbed with low power consumption and solar power supply to evaluate the performance of the proposed system. Devices in the system can communicate with each other autonomously without a centralized control device when they are within a certain distance. A single device does not result in a dominant effect for the whole system, which ensures system robustness. To validate the performance of the designed system, a simulation is used to confirm the effectiveness of the system. Moreover, in cooperation with local communities, the system has been developed and deployed in some areas of Tokyo and Kyoto, Japan. The devices were deployed on buses and fixed places along the bus routes. The experimental results show that the proposed system can work with moderate delay latency. Specifically, the latency performance obtained in the field experiments meets the system design criterion quite well, which validates the feasibility and effectiveness of the proposed system. In summary, the proposed D2D local information sharing system can work independently from the cellular system and any other existing wireless network systems, which is expected to provide more proprietary and different wireless services. The paper also gives some ideas for further system improvement.
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