We consider a cognitive radio based Internet of Things (CR-IoT) system where the secondary IoT device (SD) accesses the licensed channel during the transmission vacancies of the primary IoT device (PD). We focus on the impact of the IoT devices' heterogeneous traffic pattern on the energy efficiency and on the age of information (AoI) performance of the SD. We first derive closed-form expressions of the energy efficiency and the average AoI, and subsequently explore their convexity and monotonicity to the transmit power. Following these characterizations, an optimal transmit power optimization algorithm (TPOA) is proposed for the SD to maximize the energy efficiency while maintaining the average AoI under a predefined threshold. Numerical results verify the different preferences of the SD toward different PD traffic patterns, and provides insights into the tradeoff between the energy efficiency and the average AoI.
翻译：我们考虑的是以认知无线电为基础的物联网系统(CR-IoT),二级IoT装置(SD)在一级IoT装置(PD)传输空缺期间进入许可渠道。我们侧重于IoT装置的多种交通模式对能源效率和信息使用年龄(AoI)的影响。我们首先得出能源效率和平均AoI的封闭式表达方式,然后探索其与传输动力的相近性和单一性。根据这些特征,建议为SD提供最佳的传输动力优化算法(TPOA),以最大限度地提高能源效率,同时维持平均AoI在预先确定的阈值下的水平。数字结果证实SD对不同的PD交通模式的不同偏好,并深入了解能源效率与平均AoI之间的平衡。
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