Age of Information for Short-Packet Two-Way Relay System in Cognitive IoT Network

CHEN Yong; CAI Yueming; WANG Meng

doi:10.11999/JEIT221377

Volume 45 Issue 12

Dec. 2023

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CHEN Yong, CAI Yueming, WANG Meng. Age of Information for Short-Packet Two-Way Relay System in Cognitive IoT Network[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4254-4261. doi: 10.11999/JEIT221377

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CHEN Yong, CAI Yueming, WANG Meng. Age of Information for Short-Packet Two-Way Relay System in Cognitive IoT Network[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4254-4261. doi: 10.11999/JEIT221377

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Age of Information for Short-Packet Two-Way Relay System in Cognitive IoT Network

doi: 10.11999/JEIT221377

The Army Engineering University of PLA, Nanjing 210007, China

Funds: The National Natural Science Foundation of China (62171464, 62122094)

Received Date: 2022-11-02
Rev Recd Date: 2023-02-20

Available Online: 2023-03-14

Publish Date: 2023-12-26

Abstract

Abstract

Future cognitive Internet of Things (IoT) applications will rely on time-sensitive short-packet information to control and monitor. This paper analyzes the information freshness of secondary users in the short-packet two-way relay system. In this paper, the age of information (AoI) is used as a performance metric to measure the freshness of information. Based on the short-packet communications theory, the expressions of the packet error rate and the average peak AoI (PAoI) are derived. In addition, the performance under the high signal-to-noise ratio regime is analyzed. Due to imperfect sensing, an alternate iterative optimization algorithm is used to jointly optimize the spectrum sensing time and short-packet length to minimize the average weighted sum PAoI. The simulation results verify the correctness of the theoretical analysis. And it shows that there is a trade-off relationship between the spectrum sensing time and short-packet length, and the proposed algorithm can minimize the average weighted sum PAoI.
- Cognitive Internet of Things (IoT),
- Short-packet communications,
- Two-way relay,
- Age of information (AoI)

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References(17)

References

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