论文标题

无线网络中信息的平均峰值年龄的空间分布

Spatial Distribution of the Mean Peak Age of Information in Wireless Networks

论文作者

Mankar, Praful D., Abd-Elmagid, Mohamed A., Dhillon, Harpreet S.

论文摘要

本文考虑了一个大规模的无线网络,该网络由源用途(SD)对组成,其中源以时间宣传的方式将时间敏感的信息(称为状态更新)发送给相应的目的地。我们使用信息时代(AOI)来量化目标节点在两个不同排队学科的目标节点(即I型和II型队列)上测量的状态更新的新鲜度。假定I型排队可以以没有存储设施的先到先得(FCFS)方式以先到先得的(FCFS)方式传输状态更新。但是,类型I队列不一定会最大程度地减少AOI,因为在成功传输当前更新之前,不允许新更新进入服务器。为了克服这一缺点,我们考虑了II型队列,其中最新的状态更新在给定的传输插槽上可传输以最大程度地减少AOI。由于给定链接的更新输送率是从接收器中看到的干扰字段的函数,因此时间平均aoI可以视为空间上的随机变量。我们本文的目标是表征SD对观察到的平均AOI的空间分布,通过将它们建模为泊松双极过程。要实现这一目标,我们首先在成功概率的时刻中得出准确的界限,同时有效地捕获了SD对活动中干扰诱导的耦合。使用此结果,我们在矩和峰值AOI的空间分布上得出紧密的边界。我们的数值结果验证了我们的分析结果,并证明了各种系统设计参数对平均峰值AOI的影响。

This paper considers a large-scale wireless network consisting of source-destination (SD) pairs, where the sources send time-sensitive information, termed status updates, to their corresponding destinations in a time-slotted fashion. We employ Age of information (AoI) for quantifying the freshness of the status updates measured at the destination nodes for two different queuing disciplines, namely Type I and II queues. Type I queue is assumed to transmit the status updates in a first-come-first-served (FCFS) fashion with no storage facility. However, Type I queue may not necessarily minimize AoI because a new update will not be allowed to enter a server until the current update has been successfully transmitted. To overcome this shortcoming, we consider Type II queue in which the most recent status update available at a given transmission slot is transmitted in order to minimize the AoI. As the update delivery rate for a given link is a function of the interference field seen from the receiver, the temporal mean AoI can be treated as a random variable over space. Our goal in this paper is to characterize the spatial distribution of the mean AoI observed by the SD pairs by modeling them as a Poisson bipolar process. Towards this objective, we first derive accurate bounds on the moments of success probability while efficiently capturing the interference-induced coupling in the activities of the SD pairs. Using this result, we then derive tight bounds on the moments as well as the spatial distribution of peak AoI. Our numerical results verify our analytical findings and demonstrate the impact of various system design parameters on the mean peak AoI.

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