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Analysis of the Age of Information in Status Update Systems
Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Rapid advances in wireless technology have taken us towards a pervasively connected world in which a vast array of wireless devices, from mobile phones to environmental sensors, seamlessly communicate with each other. In some of these systems the freshness of the transmitted information is of high importance. Characterization of time-critical information can be done through the so called real-time status updates that are messages, in the form of packets, carrying a timestamp of their generation. Status updates track time-varying content that needs to be transmitted from the generation point to a remote destination within a network. To quantify the freshness of information in networked systems a novel metric, different than delay or latency, termed as "age of information" (AoI) has been introduced. In this thesis, we focus on the communication systems' adaptability to meet stringent timeliness constraints.

In Paper I, we expand the concept of information ageing by introducing the cost of update delay (CoUD) metric to characterize the cost of having stale information at the destination. Furthermore, we introduce the value of information of update (VoIU) metric that captures the degree of importance of the update received at the destination. A theoretical analysis and insights into the relation of cost and value are provided.

Paper II investigates AoI in relation with throughput in a shared access setup with heterogeneous traffc. More specifically, we consider a shared access system consisting of a primary link and a network of secondary nodes, with multipacket reception (MPR) capabilities. To study the joint throughput-timeliness performance, we formulate two optimization problems considering both objectives and provide guidelines for the design of such a multiple access system fulfilling both timeliness and throughput requirements.

Finally, in Paper III we investigate the AoI performance in various multiple access (MA) schemes, including scheduling and random access. We present analysis of the AoI with and without packet management at the transmission queue of the source nodes, considering that packet management is the capability to replace unserved packets at the queue whenever newer ones arrive. We incorporate the effect of channel fading and network path diversity in such a system and provide simulation results that illustrate the impact of network operating parameters on the performance of the different access protocols.  

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2018. , p. 29
Series
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1820
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:liu:diva-151303ISBN: 9789176852187 (print)OAI: oai:DiVA.org:liu-151303DiVA, id: diva2:1248611
Presentation
2018-09-25, K3, Kåkenhus, Campus Norrköping, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2018-09-17 Created: 2018-09-17 Last updated: 2019-05-09Bibliographically approved
List of papers
1. Age and Value of Information: Non-linear Age Case
Open this publication in new window or tab >>Age and Value of Information: Non-linear Age Case
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We consider a real-time status update system consisting of a source-destination network. A stochastic process is observed at the source, and samples, so called status updates, are extracted at random time instances, and delivered to the destination. In this paper, we expand the concept of information ageing by introducing the Cost of Update Delay (CoUD) metric to characterize the cost of having stale information at the destination. We introduce the Value of Information of Update (VoIU) metric that captures the reduction of CoUD upon reception of an update. The importance of the VoIU metric lies on its tractability which enables an alternative performance criterion in status update systems.

Place, publisher, year, edition, pages
IEEE, 2017
Series
IEEE International Symposium on Information Theory, ISSN 2157-8117
National Category
Computer Engineering
Identifiers
urn:nbn:se:liu:diva-148170 (URN)10.1109/ISIT.2017.8006543 (DOI)000430345200066 ()978-1-5090-4096-4 (ISBN)
Conference
IEEE International Symposium on Information Theory (ISIT) 2017
Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2019-07-15
2. Age of Information and Throughput in a Shared Access Network with Heterogeneous Traffic
Open this publication in new window or tab >>Age of Information and Throughput in a Shared Access Network with Heterogeneous Traffic
2018 (English)In: IEEE Global Telecommunications Conference (GLOBECOM), 2018, pp. 1-6., 2018Conference paper, Published paper (Refereed)
Abstract [en]

We consider a cognitive shared access scheme consisting of a high priority primary node and a low priority network with N secondary nodes accessing the spectrum. Assuming bursty traffic at the primary node, saturated queues at the secondary nodes, and multipacket reception capabilities at the receivers, we derive analytical expressions of the time average age of information of the primary node and the throughput of the secondary nodes. We formulate two optimization problems, the first aiming to minimize the time average age of information of the primary node subject to an aggregate secondary throughput requirement. The second problem aims to maximize the aggregate secondary throughput of the network subject to a maximum time average staleness constraint. Our results provide guidelines for the design of a multiple access system with multipacket reception capabilities that fulfills both timeliness and throughput requirements.

Series
IEEE Global Communications Conference ; 2018
Keywords
Throughput, Receivers, Information age, Delays, Aggregates, Queueing analysis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
Identifiers
urn:nbn:se:liu:diva-154649 (URN)10.1109/GLOCOM.2018.8647212 (DOI)000465774300065 ()978-1-5386-4727-1 (ISBN)978-1-5386-4728-8 (ISBN)
Conference
IEEE Global Telecommunications Conference (GLOBECOM)
Note

Funding agencies: European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [642743]

Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2019-06-28

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Kosta, Antzela

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