Excluded Channel Selection Scheme for Dynamic Spectrum Sharing in Various Interference Environments.

Dynamic spectrum sharing (DSS), in which multiple wireless systems share the same radio resource, has been considered to improve frequency utilization efficiency. In DSS, the observer measures the channel occupancy rate (COR) and the number of radio resources, such as frequencies used by other wireless systems, and dynamically selects the channel with the lowest COR for communication. As the number of channels increases, the observation time becomes longer, resulting in increased latency and reduced throughput. In addition, many existing studies have been conducted with limited interference patterns. This paper proposes an excluded channel selection scheme to shorten the observation time. In the initial observation, all channels are measured, and channels with high COR are excluded. After exclusion, only the survival channels are measured to shorten the observation time and improve the throughput and latency. Computer simulation results were evaluated to improve the throughput with the observation time rate to 0.2 and the number of excluded channels to five, and the observation time can be cut in half. Even if there is little degradation in throughput by selecting the channel with the second smallest COR, throughput is expected to be improved by reducing the observation time. The throughput characteristics were also evaluated with three types of interference patterns. It is necessary to select the number of excluded channels from the distribution so that the overlapping distribution of each COR is less than 0.03.