Cell-free massive MIMO (CF-mMIMO) network and its user-centric (UC) version are considered as promising techniques for the next generations of wireless networks. However, fronthaul backhaul assignments challenging issues in these In this paper, energy efficiencies uplink transmission CF- UC-mMIMO networks studied, wherein access points (APs) connected to aggregation nodes (ANs) through radio fr...

We consider an extension of the capacitated Vehicle Routing Problem (VRP), known as the Vehicle Routing Problem with Backhauls (VRPB), in which the set of customers is partitioned into two subsets: Linehaul and Backhaul customers. Each Linehaul customer requires the delivery of a given quantity of product from the depot, whereas a given quantity of product must be picked up from each Backhaul c...

The ant system is a metaheuristic developed for the solution of hard combinatorial optimization problems. It was first proposed by Colorni et al. [4] and Dorigo [6]. The method was inspired by the observation of the behaviour of real life ant colonies, in particular the way in which real ants find the shortest path between food sources and their nest. While walking ants deposit a substance call...

In this paper, we develop novel two-tier interference management strategies that enable macrocell users (MUEs) to improve their performance, with the help of open-access femtocells. To this end, we propose a rate-splitting technique using which the MUEs optimize their uplink transmissions by dividing their signals into two types: a coarse message that is intended for direct transmission to the ...

We are in the presence of the VRP with backhauls, also known as the linehaul-backhaul problem, when the vehicles are not only required to deliver goods to customers, but also to pick up goods at customers locations. An example of this partition of the set of customers could be the grocery industry. The supermarkets and shops are the linehaul customers and the grocery suppliers are the backhaul ...

In this paper, we consider two-tier City Logistics systems accounting for both the inbound and outbound traffic that have not been taken into account in models and algorithms for vehicle routing research. The problem under study, called the Multi-zone Multi-trip Pickup and Delivery Problem with Time Windows and Synchronization, has two sets of intertwined decisions: the routing decisions which ...

Throughout the history, Genetic Algorithms (GA) have been widely applied to a broad range of combinatorial optimization problems. Its easy applicability to areas such as transport or industry has been one of the reasons for its great success. In this paper, we propose a new Adaptive Multi-Crossover Population Algorithm (AMCPA). This new technique changes the philosophy of the basic genetic algo...

The emerging 5G New Radio (5G NR) stimulates the evolution of applications in many fields. Compared with 4G, NR can provide much more reliable, efficient, flexible networking access services to mobile devices which escalate quality (QoS) for users remarkably. advantages affordability, easy assembling and quick driving, allow deployment Unmanned Aircraft System (UAS) on a large scale, elevation ...