Device-to-device (D2D) communications are being considered a way forward to achieve higher data rate targets for futuristic wireless networks. D2D introduces interference among cellular users and D2D users. A joint resource allocation (JRA) strategy in cellular network with D2D functionality can definitely enhance overall data rate. The strategy under consideration maximizes the overall data rate of cellular network besides meeting threshold of power and interference constraints. The JRA is a class of mixed integer non-linear constraint optimization problems and is NP hard. Because of discrete nature of variables in the problem, optimal solution performs extensive search of integer variables, and problem becomes exponentially complex with the increasing number of user pairs. In this paper, mesh adaptive direct search algorithm is applied to solve the aforementioned problem. The algorithm is suitable for complex problems of combinatorial nature to solve the JRA strategy in D2D. The proposed algorithm converges to optimal solution within acceptable computational iterations. Simulation results of system capacity and interference also demonstrate the suitability of the proposed approach viz-a-viz other algorithms.
2329Mesh adaptive direct search approach for D2D resource management M. Ahmad et al.associated with underlay communication, it poses the challenge of management of the interference among cellular users caused by D2D users because of the use of the same resources by both types of users. To avoid interference problem, some researchers advocate to use some part of cellular spectrum exclusively reserved for D2D communication. This technique is called overlay in-band D2D communication. Nevertheless, D2D underlay in-band communication has obtained more popularity, and the same technique has been adopted in this research work as well.Other communication technologies such as wireless local area networks and wireless personal area networks technologies, including bluetooth and ultra-wide band, also provide higher data rates but require manual peering, and there is no control over interference as spectrum is being shared by many users in license-free band. In contrast, D2D communication due to the controlled assignment of radio resources by the BS/eNode-B in the licensed band alleviates problems of manual peering and interference among users.In [6], different techniques for controlled management of resources by the eNode-B are suggested. This reference also describes benefits of D2D communication, which include the following: (i) reduction in number of hops improves latency and proximity gain; (ii) closeness of users provides higher data rates, and reduction in power consumption improves battery life of mobile phones, better network capacity, coverage, and quality of service (QoS). The interference management challenge in D2D communication underlay is a formidable task. As we have to achieve higher data rate for future networks, while meeting the quality of standard and power constraints as well, a well-optimized joi...