On the Age of Information in Status Update Systems With Packet Management

被引：521

作者：

Costa, Maice ^{[1
]}

Codreanu, Marian ^{[2
]}

Ephremides, Anthony ^{[3
]}

机构：

[1] Univ Dublin Trinity Coll, Connect Res Ctr, Dublin 2, Ireland

[2] Univ Oulu, Ctr Wireless Communicat, Oulu 90014, Finland

[3] Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA

来源：

IEEE TRANSACTIONS ON INFORMATION THEORY | 2016年 / 62卷 / 04期

基金：

美国国家科学基金会;

关键词：

Age of information; queuing analysis; random processes; communication networks;

D O I：

10.1109/TIT.2016.2533395

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

We consider a communication system in which status updates arrive at a source node, and should be transmitted through a network to the intended destination node. The status updates are samples of a random process under observation, transmitted as packets, which also contain the time stamp to identify when the sample was generated. The age of the information available to the destination node is the time elapsed, since the last received update was generated. In this paper, we model the source-destination link using the queuing theory, and we assume that the time it takes to successfully transmit a packet to the destination is an exponentially distributed service time. We analyze the age of information in the case that the source node has the capability to manage the arriving samples, possibly discarding packets in order to avoid wasting network resources with the transmission of stale information. In addition to characterizing the average age, we propose a new metric, called peak age, which provides information about the maximum value of the age, achieved immediately before receiving an update.

引用

页码：1897 / 1910

页数：14

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