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{{Distinguish|Information Age}}{{Short description|Performance metric that captures the freshness of information}} |
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#REDIRECT [[Information Age]] |
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The '''Age of Information''' (AoI) is a recently proposed performance metric that captures the freshness of information from the perspective of the destination in an [[Telecommunication| communication network]].<ref>{{Cite conference |last1=Wijerathna Basnayaka |first1=Chathuranga M. |last2=Jayakody |first2=Dushantha Nalin K. |last3=Ponnimbaduge Perera |first3=Tharindu D. |last4=Vidal Ribeiro |first4=Moisés |date=2021-04-01 |title=Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System |url=https://ieeexplore.ieee.org/document/9449007 |conference=2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring) |pages=1–6 |doi=10.1109/VTC2021-Spring51267.2021.9449007}}</ref> [[Data scientists]] introduced the concept of Age of Information (AoI) as a data freshness metric in the early 1990s to evaluate data in terms of temporal consistency in real-time databases. With the fast progress of information technology, the concept of AoI extended to other study fields such as wireless communication, since timely information transmission became more essential for present wireless communication applications. Recent developments in AoI research reveal that several well-known design concepts of traditional data and communication networks (for example, maintaining high throughput and low latency) must be reconsidered in order to improve information freshness in real-time applications.<ref>{{Cite book |last1=Sun |first1=Yin |url=https://www.morganclaypool.com/doi/abs/10.2200/S00954ED2V01Y201909CNT023 |title=Synthesis Lectures on Communication Networks |last2=Kadota |first2=Igor |last3=Talak |first3=Rajat |last4=Modiano |first4=Eytan |date=2019-12-11 |volume=12 |pages=1–224 |doi=10.2200/S00954ED2V01Y201909CNT023 |issn=1935-4185}}</ref><ref>{{Cite conference |last1=Wijerathna Basnayaka |first1=Chathuranga M. |last2=Jayakody |first2=Dushantha Nalin K. |last3=Ponnimbaduge Perera |first3=Tharindu D. |last4=Vidal Ribeiro |first4=Moisés |date=2021-04-01 |title=Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System |url=https://ieeexplore.ieee.org/document/9449007 |conference=2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring) |pages=1–6 |doi=10.1109/VTC2021-Spring51267.2021.9449007}}</ref><ref>{{Cite book |last=Kosta |first=Antzela |url=https://www.worldcat.org/oclc/1053847323 |title=Age of information : a new concept, metric, and tool |date=2017 |isbn=978-1-68083-361-4 |location=[Hanover, Massachusetts] |language=en-US |oclc=1053847323}}</ref><ref>{{Cite web |last=Basnayaka |first=Chathuranga |date=2021-10-26 |title=Age of Information Based URLLC-enabled UAV Wireless Communications System |url=https://www.techrxiv.org/articles/preprint/Age_of_Information_Based_URLLC-enabled_UAV_Wireless_Communications_System/16826194/1 |access-date=2021-10-28 |language=en |doi=10.36227/techrxiv.16826194.v1}}</ref> |
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==AoI Estimation== |
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When the most recent received update of the destination at time (<math>t</math>) has the generating time-stamp (<math>a(t)</math>), the age (<math> \Delta (t)</math>) is determined by a random process as follows:<ref> {{Cite arXiv |eprint=2105.15102|last1=Wijerathna Basnayaka|first1=Chathuranga M.|last2=Jayakody|first2=Dushantha Nalin K.|last3=Ponnimbaduge Perera|first3=Tharindu D.|author4=Moises Vidal Ribeiro|title=Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System|year=2021|class=cs.NI}} |
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</ref> |
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:<math> \Delta (t)=t-a(t). </math> |
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For a updating system with <math> (Y) </math> as the interarrival time between given updates and <math>(X)</math> as the system time of such a delivered packet, the time-average AoI <math>(\Delta_{a}) </math> is given by |
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:<math> \Delta_{a}=\frac{\frac{\mathbb{E}[X^{2}]}{2}+\mathbb{E}[XY]}{\mathbb{E}[X]}</math> |
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== See also == |
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*[[Network delay]] |
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*[[Latency (engineering)]] |
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* [[Interrupt latency]] |
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* [[Lead time]] |
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* [[Memory latency]] |
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* [[Performance engineering]] |
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* [[Response time (technology)]] |
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* [[Responsiveness]] |
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* [[End-to-end delay]] |
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* [[Minimum-Pairs Protocol]] |
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* [[Round-trip delay]] |
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{{Free-content attribution| |
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| title = Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System |
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| author = Chathuranga M. Wijerathna Basnayaka, Dushantha Nalin K. Jayakody, Tharindu D. Ponnimbaduge Perera, Moises Vidal Ribeiro |
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| publisher = arXiv |
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| source= <!-- The source of the work if not from the publisher or the author --> |
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| documentURL = https://arxiv.org/abs/2105.15102 |
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| License statement URL = <!-- The URL of the license statement of the work if not included within the document --> |
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| license = CC BY 4.0 |
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}} |
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== References == |
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{{reflist}} |
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[[Category:Information theory]] |
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[[Category:Telecommunication theory]] |
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[[Category:Mathematical theorems in theoretical computer science]] |
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[[Category:Theorems in statistics]] |
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[[Category:Wireless communication systems]] |
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[[Category:Computer networking]] |
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{{compu-network-stub}} |
Revision as of 10:31, 10 November 2021
The Age of Information (AoI) is a recently proposed performance metric that captures the freshness of information from the perspective of the destination in an communication network.[1] Data scientists introduced the concept of Age of Information (AoI) as a data freshness metric in the early 1990s to evaluate data in terms of temporal consistency in real-time databases. With the fast progress of information technology, the concept of AoI extended to other study fields such as wireless communication, since timely information transmission became more essential for present wireless communication applications. Recent developments in AoI research reveal that several well-known design concepts of traditional data and communication networks (for example, maintaining high throughput and low latency) must be reconsidered in order to improve information freshness in real-time applications.[2][3][4][5]
AoI Estimation
When the most recent received update of the destination at time () has the generating time-stamp (), the age () is determined by a random process as follows:[6]
For a updating system with as the interarrival time between given updates and as the system time of such a delivered packet, the time-average AoI is given by
See also
- Network delay
- Latency (engineering)
- Interrupt latency
- Lead time
- Memory latency
- Performance engineering
- Response time (technology)
- Responsiveness
- End-to-end delay
- Minimum-Pairs Protocol
- Round-trip delay
This article incorporates text from a free content work. Licensed under CC BY 4.0. Text taken from Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System, Chathuranga M. Wijerathna Basnayaka, Dushantha Nalin K. Jayakody, Tharindu D. Ponnimbaduge Perera, Moises Vidal Ribeiro, arXiv.
References
- ^ Wijerathna Basnayaka, Chathuranga M.; Jayakody, Dushantha Nalin K.; Ponnimbaduge Perera, Tharindu D.; Vidal Ribeiro, Moisés (2021-04-01). Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System. 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring). pp. 1–6. doi:10.1109/VTC2021-Spring51267.2021.9449007.
- ^ Sun, Yin; Kadota, Igor; Talak, Rajat; Modiano, Eytan (2019-12-11). Synthesis Lectures on Communication Networks. Vol. 12. pp. 1–224. doi:10.2200/S00954ED2V01Y201909CNT023. ISSN 1935-4185.
- ^ Wijerathna Basnayaka, Chathuranga M.; Jayakody, Dushantha Nalin K.; Ponnimbaduge Perera, Tharindu D.; Vidal Ribeiro, Moisés (2021-04-01). Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System. 2021 IEEE 93rd Vehicular Technology Conference (VTC2021-Spring). pp. 1–6. doi:10.1109/VTC2021-Spring51267.2021.9449007.
- ^ Kosta, Antzela (2017). Age of information : a new concept, metric, and tool. [Hanover, Massachusetts]. ISBN 978-1-68083-361-4. OCLC 1053847323.
{{cite book}}
: CS1 maint: location missing publisher (link) - ^ Basnayaka, Chathuranga (2021-10-26). "Age of Information Based URLLC-enabled UAV Wireless Communications System". doi:10.36227/techrxiv.16826194.v1. Retrieved 2021-10-28.
- ^ Wijerathna Basnayaka, Chathuranga M.; Jayakody, Dushantha Nalin K.; Ponnimbaduge Perera, Tharindu D.; Moises Vidal Ribeiro (2021). "Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System". arXiv:2105.15102 [cs.NI].