arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.12277eess.SPcs.ITcs.NIcs.SYeess.SYmath.IT
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具有能量收集传感器的资源受限缓存使能IoT网络中的按需AoI最小化

On-Demand AoI Minimization in Resource-Constrained Cache-Enabled IoT Networks with Energy Harvesting Sensors

Mohammad Hatami, Markus Leinonen, Zheng Chen, Nikolaos Pappas, Marian Codreanu

摘要:

我们考虑一个资源受限的物联网网络,其中多个用户向启用缓存的边缘节点发出按需请求,以发送有关各种随机过程的状态更新,每个过程都由能量收集传感器监控。边缘节点通过决定是否命令相应的传感器发送新的状态更新或从缓存中检索最近接收的测量结果来满足用户的请求。我们的目标是找到边缘节点的最佳动作,以最小化在请求时接收到的测量的平均信息年龄(AoI),即,平均按需AoI,服从每时隙传输和能量约束。首先,我们推导出一个马尔可夫决策过程模型,并提出了一个迭代算法,获得最优策略。然后,我们开发了一个渐近最优的低复杂度算法-称为松弛,然后截断-并证明它是最佳的传感器的数量趋于无穷大。仿真结果表明,所提出的松弛,然后截断的方法显着降低了平均按需AoI相比,一个请求感知的贪婪(近视)的政策,也描绘了它执行接近最佳的解决方案,即使是中等数量的传感器。

英文摘要:

We consider a resource-constrained IoT network, where multiple users make on-demand requests to a cache-enabled edge node to send status updates about various random processes, each monitored by an energy harvesting sensor. The edge node serves users' requests by deciding whether to command the corresponding sensor to send a fresh status update or retrieve the most recently received measurement from the cache. Our objective is to find the best actions of the edge node to minimize the average age of information (AoI) of the received measurements upon request, i.e., average on-demand AoI, subject to per-slot transmission and energy constraints. First, we derive a Markov decision process model and propose an iterative algorithm that obtains an optimal policy. Then, we develop an asymptotically optimal low-complexity algorithm -- termed relax-then-truncate -- and prove that it is optimal as the number of sensors goes to infinity. Simulation results illustrate that the proposed relax-then-truncate approach significantly reduces the average on-demand AoI compared to a request-aware greedy (myopic) policy and also depict that it performs close to the optimal solution even for moderate numbers of sensors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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