Abstract
This paper studies the robust resource allocation to improve the robustness against the channel state information (CSI) uncertainties for energy harvesting (EH)-aided device-to-device (D2D) communication underlaying cellular network. In this network, EH-aided D2D transmitters can reuse the uplink cellular sub-channels to perform transmission to the desired D2D receivers. Assuming the link gains in the interference channels are uncertain, we formulate the robust resource allocation problem with a view to maximizing the sum-rate of the D2D links while guaranteeing the power outage Quality-of-Service (QoS) requirements and interference constraints. In doing so, both deterministic and statistical uncertainty model are adopted to specify the CSI uncertainties. This resulting robust problem is essentially non-convex and intractable in its original form. Therefore, we firstly utilize the worst-case approach and chance constraint approach to find its tractable and convex forms. Then, via employing the Lagrangian dual method, we derive the semi-closed expression for the power allocation and two rules for assigning sub-channels. Based on the theoretical results, a distributed subgradient-based iterative algorithm is developed to achieve the optimally robust resource allocation. Finally, an in-depth simulation is conducted to verify the effectiveness of the proposed algorithm and evaluate the effect of CSI uncertainties and power outage QoS requirement on the sum-rate of the D2D links.
Highlights
Device-to-device (D2D) communication has recently emerged as an enabling solution to the explosive growth of mobile data traffic and ubiquitous mobile services in 5G cellular networks [1], [2]
Intensive research interests have been attracted to energy harvesting (EH)-aided D2D communication underlaying cellular networks (EH-DCCNs), where D2D devices are with an EH capability [4]–[12]
PROBLEM FORMULATION we investigate the joint power allocation and sub-channel assignment with a view to maximizing the sum-rate of the D2D links while guaranteeing the cross-tier interference constraint at base stations (BSs) and the power outage constraints for D2D links
Summary
Device-to-device (D2D) communication has recently emerged as an enabling solution to the explosive growth of mobile data traffic and ubiquitous mobile services in 5G cellular networks [1], [2]. With the chance constraint approach, Bai et al [24] proposed a joint resource allocation policy about the resource block assignment and power allocation among the DUs and CUs, and achieved a trade-off between the robustness and the optimality by utilizing the chance constrained techniques These works have explored the resource allocation problem with channel uncertainties for diverse D2D communication scenarios, the joint effect of channel uncertainties and the power outage QoS provisioning on the resource allocation is still unknown. We consider two types of uncertain CSI parameters: the CSI between D2D-Txs and BS referred to as the cross-tier interference CSI (C-CSI), and the CSI between D2D-Txs and other D2D receivers (D2D-Rxs) referred to as the intra-tier interference CSI (I-CSI) By incorporating these channel uncertainties, a robust resource allocation problem is devised with a view to maximizing the sum-rate of the D2D links by jointly optimizing the power allocation and sub-channel assignment, guaranteeing the outage QoS requirements. N=1 which constraints the aggregate interference generated by all DUs over each cellular sub-channel under a specified threshold, and ImBS is the maximum interference limit for the m-th sub-channel at BS
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