论文标题
与机会主义渠道访问的物联网中的最低信息年龄
Minimum Age of Information in Internet of Things with Opportunistic Channel Access
论文作者
论文摘要
本文调查了物联网（IoT）系统，其中多个设备观察某些对象的物理参数，然后通过机会性渠道访问将其观察值及时地将其观察值倒回BS。具体而言，每个设备首先通过特定概率访问公共通道，然后获胜者评估即时通道条件，并决定接受通道访问权的权利。我们通过信息时代（AOI）的角度分析该系统，该信息描述了观察到的信息的新鲜感。目标是通过优化设备参与争夺和传输速率阈值的可能性来最大程度地减少平均AOI。问题很难解决，因为分数形式的AOI表达很复杂。我们首先通过Dinkelbach方法和块坐标下降（BCD）方法将原始问题分解为两个单变量优化子问题。然后，我们通过证明目标函数的单调性来将它们转化为单调优化问题，该目标函数的全局最佳解决方案可以通过综合算法找到。数值结果验证了我们提出的方法的有效性。
This paper investigates an Internet of Things (IoT) system in which multiple devices are observing some object's physical parameters and then offloading their observations back to the BS in time with opportunistic channel access. Specifically, each device accesses the common channel through contention with a certain probability firstly and then the winner evaluates the instant channel condition and decides to accept the right of channel access or not. We analyze this system through the perspective of Age of Information (AoI), which describes the freshness of observed information. The target is to minimize average AoI by optimizing the probability of device participation in contention and the transmission rate threshold. The problem is hard to solve since the AoI expression in fractional form is complex. We first decompose the original problem into two single-variable optimization sub-problems through Dinkelbach method and Block Coordinate Descent (BCD) method. And then we transform them to Monotonic optimization problems by proving the monotonicity of the objective functions, whose global optimal solution is able to be found through Polyblock algorithm. Numerical results verify the validity of our proposed method.
