Simultaneous Information and Energy Flow for IoT Relay Systems with Crowd Harvesting

To boost energy saving for the general delay-tolerant IoT networks, a two-stage and single-relay queueing communication scheme is investigated. Concretely, a traffic-aware Nthreshold and gated-service policy are applied at the relay. As two fundamental and significant performance metrics, the mean waiting time and long-term expected power consumption are explicitly derived and related with the queueing and service parameters, such as packet arrival rate, service threshold and channel statistics. Besides, we take into account the electrical circuit energy consumptions when the relay server and access point (AP) are in different modes and energy costs for mode transitions, whereby the power consumption model is more practical. The expected power minimization problem under the mean waiting time constraint is formulated. Tight closed-form bounds are adopted to obtain tractable analytical formulae with less computational complexity. The optimal energy-saving service threshold that can flexibly adjust to packet arrival rate is determined. In addition, numerical results reveal that: 1) sacrificing the mean waiting time not necessarily facilitates power savings; 2) a higher arrival rate leads to a greater optimal service threshold; and 3) our policy performs better than the current state-of-the-art.Index Terms-Delay tolerant IoT relaying networks, mean waiting time, N -threshold and gated policy, two-hop queueing, and traffic-aware power saving.

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“…process. It is further assumed that the length of each individual packet is fixed and denoted as l. 3 The individual service time is obtained as…”

Section: A the First Service Stage (Fss)mentioning

confidence: 99%

Traffic-Aware Two-Stage Queueing Communication Networks: Queue Analysis and Energy Saving

Miridakis

Xiao

et al. 2020

IEEE Trans. Commun.

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“…How to prolong the network lifetime and reduce power consumption have attracted lots of intention from both industry and academia. Currently, simultaneous wireless information and power transfer (SWIPT) is proposed for extending the life cycle of energy-limited communication networks by harvesting surrounding radio frequency [1]- [4]. According to the policy of the SWIPT, wireless information is divided into two kinds of signals: energy-harvesting signal and information-decoding signal.…”

Section: Introductionmentioning

confidence: 99%

Optimal and Robust Distributed Resource Allocation for SWIPT-Enabled Cognitive Networks

Xu¹,

Sun²,

Yang³

et al. 2020

Preprint

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Simultaneous wireless information and power transfer (SWIPT)-enabled cognitive networks (CRNs) is recognized as one of the most promising techniques to improve spectrum efficiency and prolong operation lifetime in 5G and beyond. However, existing methods focus on the centralized algorithm and the power allocation under perfect channel state information (CSI). The analytical solution and the impact of power splitting (PS) on the optimal power allocation strategy are not addressed. In addition, the influence of the PS factor on the feasible region of transit power is rarely analyzed. In this paper, we propose a joint power allocation and PS algorithm under perfect CSI and imperfect CSI, respectively, for multiuser SWIPT-enabled CRNs scenarios. The power minimization of resource allocation problem is formulated as a multivariate nonconvex optimization which is hard to obtain the closed-form solution. Hence, we propose a suboptimal algorithm to alternatively optimize the power allocation and PS coefficient under the cases of the low-harvested energy region and the high-harvested energy region, respectively. Moreover, a closed-form distributed power allocation and PS expressions are derived by the Lagrangian approach. Simulation results confirm the proposed method with good robustness and high energy efficiency.

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“…Motivated by the above observations, in this paper, we study the T2T and system outage probabilities of three-step DF TWRNs, where PS and "harvest-then-forward" are employed at the relay node, and derive expressions for both of them. Different from the T2T outage probability, the system 1 In PS based three-step TWRNs, the relay is equipped with one power splitter and the PS ratios for both terminal-relay links may be unequal. If the PS ratios for two terminal-relay links are always equal, we refer to the PS scheme as the symmetric PS; otherwise, we refer to it as the asymmetric PS.…”

Section: Introductionmentioning

confidence: 99%

On the Outage Performance of SWIPT-Based Three-Step Two-Way DF Relay Networks

Shi

Chu

et al. 2019

IEEE Trans. Veh. Technol.

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In this paper, we study the outage performance of simultaneous wireless information and power transfer (SWIPT) based three-step two-way decode-and-forward (DF) relay networks, where both power-splitting (PS) and "harvest-thenforward" are employed. In particular, we derive the expressions of terminal-to-terminal (T2T) and system outage probabilities based on a Gaussian-Chebyshev quadrature approximation, and obtain the T2T and system outage capacities. The effects of various system parameters, e.g., the static power allocation ratio at the relay, symmetric PS, as well as asymmetric PS, on the outage performance of the investigated network are examined. It is shown that our derived expression for T2T outage capacity is more accurate than existing analytical results, and that the asymmetric PS achieves a higher system outage capacity than the symmetric one when the channels between the relay node and the terminal nodes have different statistic gains.Index Terms-Outage performance, SWIPT based three-step two-way DF relay, power-splitting.

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Simultaneous Information and Energy Flow for IoT Relay Systems with Crowd Harvesting

Cited by 64 publications

References 14 publications

Traffic-Aware Two-Stage Queueing Communication Networks: Queue Analysis and Energy Saving

Traffic-Aware Two-Stage Queueing Communication Networks: Queue Analysis and Energy Saving

Optimal and Robust Distributed Resource Allocation for SWIPT-Enabled Cognitive Networks

On the Outage Performance of SWIPT-Based Three-Step Two-Way DF Relay Networks

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