论文标题
优化双向继电器网络中的信息新鲜度
Optimizing Information Freshness in Two-Way Relay Networks
论文作者
论文摘要
在本文中，我们研究了一个基于放大的（AF）基于双向合作状态更新系统，其中两个来源旨在在继电器的帮助下及时交换状态更新。具体而言，继电器一次接收到两个源的总和信号，然后在下一个时插槽中放大并将接收的信号转发至两个源。我们采用最近提出的概念，即信息时代（AOI），以表征状态更新的及时性。假设这两个源能够在每个时间插槽的开头生成状态更新（即生成 - 将生成 - 将生成模型），则我们得出了所考虑系统的预期加权总和AOI的封闭形式表达式。我们通过优化峰值功率约束下每个节点的传输功率来进一步最小化预期的加权总和AOI。仿真结果证实了我们的理论分析的正确性。
In this paper, we investigate an amplify-and-forward (AF) based two-way cooperative status update system, where two sources aim to exchange status updates with each other as timely as possible with the help of a relay. Specifically, the relay receives the sum signal from the two sources in one time slot, and then amplifies and forwards the received signal to both the sources in the next time slot. We adopt a recently proposed concept, the age of information (AoI), to characterize the timeliness of the status updates. Assuming that the two sources are able to generate status updates at the beginning of each time slot (i.e., generate-at-will model), we derive a closed-form expression of the expected weighted sum AoI of the considered system. We further minimize the expected weighted sum AoI by optimizing the transmission power at each node under the peak power constraints. Simulation results corroborate the correctness of our theoretical analysis.
