Enhancing URLLC in Integrated Aerial Terrestrial Networks: Design Insights and Performance Trade-offs

Abstract

Non-orthogonal multiple access (NOMA) is a promising radio access technique that enables massive connectivity and increased spectral efficiency. The deployment of aerial base stations (ABSs) as a relay is also an optimistic goal that fairly serves a large number of internet of things (IoT) devices. On one side, ABS-assisted communication leverages effective communication services for secondary IoT devices in smart cities. On the other hand, NOMA allows several IoT devices to concurrently acquire the same frequency-time resource. To this end, weighted sum-rate (WSR) is an essential goal because it allows numerous trade-offs between user fairness and sum-rate efficiency. Therefore, this work aims to investigate the WSR for an integrated aerial terrestrial network subject to cellular power and delay constraints in downlink NOMA. Herein, a theoretical insight-based low-complexity iterative solution is provided for optimal power and blocklength allocation to achieve maximum sum-rate. For this purpose, the mixed-integer non-linear problem is formulated and a low-complexity near-optimal solution is proposed. Numerical results show that the proposed scheme achieves a near-optimal solution and outperforms baseline techniques, i.e., the performance gain of 5.18% over the legacy OMA system for NOMA with two IoT devices per subcarrier.

Energy-Aware Resource Optimization for Improved URLLC in Multi-Hop Integrated Aerial Terrestrial Networks

“…. The pseudocode for computing the optimal power p opt within the range of [0, pk ] is provided in Algorithm (1). The algorithm first assigns the variables s and t with the values of π k (u k ) and π k (u k − 1), respectively.…”

“…min = 2 bits/s/Hz [34]. We utilize the radio propagation channel model provided in [1]. For simplicity, we assume the sum of the blocklengths of each communication link within each hop is equal to the blocklength of individual links.…”

“…T HE emergence of advanced wireless infrastructure has transformed how information is generated, disseminated, received, and perceived [1]. The capacity is expected to increase by up to 1000 times to support the growing number of wireless users and internet of things (IoTs) devices [2].…”

“…Prior work not only highlights some inherent problems, such as channel estimation errors and successive interference cancellation (SIC), but also brings further challenges, such as the spatial distribution of ABSs which poses challenges in the security domain, and flexible mobility which makes the channel more complex [10]. Therefore, there is a strong need to explore the potential applications of integrated aerial terrestrial communication in the FBL regime by utilizing next generation multiple access techniques 1 .…”