The advent of 5G networks has resulted in an increased need for faster data rates and enhanced network performance. Heterogeneous Networks (HetNets) have emerged as a promising solution to address coverage and capacity enhancements for 5G networks. However, efficient bandwidth allocation remains a significant challenge in HetNets, with traditional resource allocation techniques falling short in meeting the requirements of 5G networks. To tackle this challenge, a novel technology called Downlink/Uplink Decoupling (DUDe) has been proposed. DUDe dynamically adjusts the allocation of network resources based on user demand and network conditions, aiming to optimize bandwidth allocation in HetNets. This paper aims to emphasize the importance of DUDe technology specifically in Macro Cell offloading within 5G HetNets. It evaluates the performance of DUDe in comparison to traditional resource allocation techniques, shedding light on the key factors influencing its effectiveness. Furthermore, the paper presents a comprehensive analysis of simulation results and offers recommendations for future research. The findings of this study have practical implications for network operators and researchers, providing insights to develop more efficient and effective resource allocation strategies for 5G networks.