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Age of Information in Wireless Powered Networks in Low SNR Region for Future 5G

by Huimin Hu 1,2, Ke Xiong 1,2,*, Yu Zhang 3, Pingyi Fan 4, Tong Liu 5 and Shaoli Kang 6
School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China
Beijing Key Laboratory of Traffic Data Analysis and Mining, Beijing Jiaotong University, Beijing 100044, China
State Grid Energy Research Institute Co., Ltd., Beijing 102209, China
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Beijing Computing Center, Beike Industry Park, Beijing 100094, China
China Academy of Telecommunications Technology, Beijing 100191, China
Author to whom correspondence should be addressed.
Entropy 2018, 20(12), 948;
Received: 7 November 2018 / Revised: 3 December 2018 / Accepted: 5 December 2018 / Published: 10 December 2018
(This article belongs to the Special Issue Information Theory and 5G Technologies)
Wireless powered communication technology has a great potential to power low-power wireless sensor networks and Internet of Things (IoT) for real-time applications in future 5G networks, where age of information (AoI) plays a very important performance metric. This paper studies the system average AoI of a wireless powered network, where a wireless-powered user harvests energy from a wireless power source (WPS) and then transmits data packets to its access point (AP) by using the harvested energy. The user generates data packets with some probability and adopts the first-come-first-served (FCFS) service policy. For such a system, by using the queuing theory and the probability models, we derive a closed-form expression of the system average AoI. We also formulate an optimization problem to minimize the AoI by optimizing the data packet generating probability, and find its solution by simple calculation and search. Simulation results demonstrate the correctness of our obtained analytical results. It also shows that, when the total distance of the two hops is fixed, the system average AoI increases linearly with the increment of the distance of the first hop, and a smaller data packet generating probability should be selected to match a bigger first-hop distance for achieving a smaller system average AoI. Moreover, a smaller data packet size also contributes to a smaller system average AoI. View Full-Text
Keywords: age of information; energy harvest; wireless power; block Rayleigh fading channel age of information; energy harvest; wireless power; block Rayleigh fading channel
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Hu, H.; Xiong, K.; Zhang, Y.; Fan, P.; Liu, T.; Kang, S. Age of Information in Wireless Powered Networks in Low SNR Region for Future 5G. Entropy 2018, 20, 948.

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