论文标题

了解大规模无线网络中的信息时代

Understanding Age of Information in Large-Scale Wireless Networks

论文作者

Yang, Howard H., Xu, Chao, Wang, Xijun, Feng, Daquan, Quek, Tony Q. S.

论文摘要

在大规模无线网络的背景下,研究了信息年龄的概念(AOI),其中发射器需要将作为独立Bernoulli流程生成的一系列信息数据包发送给其预期的接收器,以在共享的频谱上发送给其预期的接收器。由于干扰,任何给定节点处的数据包耗竭速率都与两个空间配置纠缠在一起,这些空间配置确定了路径损耗,而影响其他发射器的时间动力学会影响活性状态,从而导致队列在整个网络上都在空间和空间上相互作用。为此,数据包更新频率中的变体不仅会影响到达时间间的时间,还会影响出发过程,并且这种现象对AOI的影响尚不清楚。在本文中,我们建立了一个理论框架,以表征上述环境中的AOI性能。特别是,在两种不同的传输方案下,即FCFS和LCFS-pr,峰值和平均AOI的触觉表达式均可得出。基于理论结果,我们发现:i)在LCFS-PR下运行的网络能够达到峰值和平均AOI的较小的值,而AOI的值比在FCF下达到的峰值值更小,而当基础设施密集地部署基础设施时,增益更为明显,在稀疏的访问网络中,请访问ALOHA,因此,请访问Aloha,因此,Aloha的访问范围内,请访问Aloha,并补充了Aloha的访问,因此可以将其供应。接近和iii)当基础架构密集推出时,存在非平凡的Aloha通道访问概率,可将FCFS和LCFS-PR的峰值和平均AOI最小化。

The notion of age-of-information (AoI) is investigated in the context of large-scale wireless networks, in which transmitters need to send a sequence of information packets, which are generated as independent Bernoulli processes, to their intended receivers over a shared spectrum. Due to interference, the rate of packet depletion at any given node is entangled with both the spatial configurations, which determine the path loss, and temporal dynamics, which influence the active states, of the other transmitters, resulting in the queues to interact with each other in both space and time over the entire network. To that end, variants in the packet update frequency affect not just the inter-arrival time but also the departure process, and the impact of such phenomena on the AoI is not well understood. In this paper, we establish a theoretical framework to characterize the AoI performance in the aforementioned setting. Particularly, tractable expressions are derived for both the peak and average AoI under two different transmission protocols, namely the FCFS and the LCFS-PR. Based on the theoretical outcomes, we find that: i) networks operating under LCFS-PR are able to attain smaller values of peak and average AoI than that under FCFS, whereas the gain is more pronounced when the infrastructure is densely deployed, ii) in sparsely deployed networks, ALOHA with a universally designed channel access probability is not instrumental in reducing the AoI, thus calling for more advanced channel access approaches, and iii) when the infrastructure is densely rolled out, there exists a non-trivial ALOHA channel access probability that minimizes the peak and average AoI under both FCFS and LCFS-PR.

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