Resource Allocation in Device to Device Communication for 5G Cellular Network

Abstract

The increased usage of smart devices and mobile applications has resulted in a tremendous increase in mobile traffic demand over the previous decade. As a result, efficiency and availa bility are important criteria for the development of future cellular networks, with device-to device (D2D) communication being one of the most promising technologies. In contrast to com munication through Base Station, D2D communication allows mobile users in close proximity to interact directly with each other, avoiding the base station. Some of the potential benefits and problems of D2D communication in cellular networks are explored in this thesis. This thesis is primarily concerned with resource allocation approaches for direct D2D communication and Communication through Base Station over cellular spectrum. The main contributions are in the area of resource allocation mechanisms, which are widely recognized as critical strategies for realizing the technology's promises. The incorporation of D2D communication in cellular network is first explored to see if it may improve their energy efficiency. Energy efficiency of d2d shows better result than that of through base station for short distance communication. in the simulation, we fixed distance to 100m. for the given distance, D2D communication shows better result in energy efficiency and spectral efficiency. but as distance increases, communication via base station resulted in better perfor mance since BS covers more distance. so we can conclude that, for shorter distance d2d is more preferable than BS. The transmission energy consumption is reduced by optimizing mode se lection, downlink transmission period, and power allocation together. Second, D2D's performance in LTE and 5G networks is compared. Moreover, we have evalu ated the effect of instantaneous SNR on the data rate at different sub-carrier spacing or numer ology. Unlike 4G LTE which has only 15 kHz sub carriers spacing on a resource block, for a single resource element, 5G has a varieties of numerology which ranges from 15 kHz to 120 kHz. For all SNR values, the data rate has increasing function despite the value of the carrier frequency.