Institute of Transportation, MOTC

      With the rapid development of the information communication technology, more and more devices have their demands on the spectrum resource to access the internet service. However, spectrum resource is limited. It’s a big challenge for mobile operator, manufacture, and government to make spectrum usage more efficient. In order to manage the spectrum resource efficiently, this study aims to build a dynamic spectrum management and access platform according to the IEEE 1900 standards. Also, this study includes spectrum transaction which is implemented with blockchain technology into the spectrum management platform. Raspberry Pi 3 Model B equipped with USRP (universal software radio peripheral) is used in this study as a CR (cognitive radio) device. In dynamic spectrum access scheme, a CR device would sense the radio environment before transmitting data in order to avoid possible interference. If the device concludes that other devices nearby are using the certain spectrum resource, the device itself will dynamically adjust its key parameters such as carry frequency and modulation scheme. Spectrum management database plays another significant row in this study. When the database receives a transmitting request from CR device, it must determine whether interference happens. To make the spectrum transaction system safe and sound, blockchain technology is employed in this study. Blochchain is resistant to modification of each transaction record, so it can assure the safety of whole system without any malicious attack and simultaneously verify every transaction in the dynamic spectrum management and access platform.