Abstract
This article unveils the importance of statistical quality of service (QoS) for resource allocation in a two-hop network. Particularly, an access point (AP) serves multiple IoT devices for information transfer with the assistance of the energy harvesting (EH) relaying. To explore the maximum constant data arrival metric, we aim to maximize the effective capacity (EC) under specified QoS requirements. Also, the statistical QoS inspired resource allocation policies are investigated for half/full duplex (HD/FD) modes, respectively, to jointly optimize power allocation and power splitting (PS) ratio. To solve the formulated problem, we first derive the closed-form solution of the optimal power allocation at the AP and the PS ratio. To gain more insights, we further derive the boundary conditions of optimal power allocation and PS ratio. Finally, numerical results are demonstrated to validate the theoretical derivations, which highlights the proposed scheme in terms of EC performance in comparison to the benchmark scheme.
Highlights
With the advance of fifth generation (5G) communication networks, the wireless devices have been employed for numerous applications, i.e., sensor detection [1]–[3]
Observing Eq(12), we find that the effective capacity (EC) for wireless powered relay based Internet of Things (IoT) networks referred to as the throughput under the statistical delay-bounded quality of service (QoS) guarantees
For wireless powered relay based IoT networks with full duplex mode, we optimize the optimal access point power control policy, denoted by Paf, and power splitting ratio, denoted by ρf, to maximize the effective capacity under the mean power constraint, which is shown as follows (P2) : arg max
Summary
With the advance of fifth generation (5G) communication networks, the wireless devices have been employed for numerous applications, i.e., sensor detection [1]–[3]. To further improve the performance of the wireless powered relay based IoT networks, we study the optimal resource allocation schemes under full duplex mode, which can potentially improve the network capacity by allowing the simultaneous information reception and transmission. Based on the corresponding links CSI and the real-time traffic determined delay-bounded QoS constraint, the access point and relay node should optimize the resource allocation policies to maximize the network throughput under the statistical delay-bounded QoS requirement.
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