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Title
Japanese: 
English:Joint Performance Analysis of Ages of Information in a Multi-Source Pushout Server 
Author
Japanese: 姜 裕康, 三好 直人.  
English: Yukang Jiang, Naoto Miyoshi.  
Language English 
Journal/Book name
Japanese: 
English:IEEE Transactions on Information Theory 
Volume, Number, Page Volume 68    Issue 2    pp. 965-975
Published date Feb. 2022 
Publisher
Japanese: 
English:IEEE 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://ieeexplore.ieee.org/document/9598815
 
DOI https://doi.org/10.1109/TIT.2021.3124872
Abstract Age of information (AoI) has been widely accepted as a measure quantifying freshness of status information in real-time status update systems. In many of such systems, multiple sources share a limited network resource and therefore the AoIs defined for the individual sources should be correlated with each other. However, there are not found any results in the literature studying the correlation of two or more AoIs in a status update system with multiple sources. In this work, we consider a multi-source system sharing a common service facility and provide a framework to investigate joint performance of the multiple AoIs. We then apply our framework to a simple pushout server with multiple sources and derive a closed-form expression for the joint Laplace transform of the AoIs in the case with independent M/G inputs. We further show some properties of the correlation coefficient of AoIs in the two-source system.

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