This paper introduces a novel approach to resource access optimization in collaborative environments with overlapping member access. The Key Trees Combining Algorithm (KTCA) is proposed to streamline access to shared resources by efficiently managing overlapping access permissions among members. KTCA leverages hierarchical structures to reduce redundancy and complexity in access control. Through experimental validation, this paper demonstrates the effectiveness of KTCA in improving resource access efficiency and reducing access conflicts, making it a valuable tool for collaborative platforms and shared resource management.

This research delves into the realm of signal security in wireless communication systems, specifically focusing on voice frequency transmission in a 5G-compatible environment. The study introduces a robust and fortified approach within a Multiuser Downlink Multiple Input Multiple Output (MIMO) Non-Orthogonal Multiple Access (NOMA) framework. Through advanced encryption techniques and adaptive modulation schemes, the proposed system aims to enhance the confidentiality and reliability of voice signals in the context of a multiuser wireless communication network. The investigation encompasses simulations and analyses, shedding light on the efficacy and resilience of the developed approach in ensuring the secure transmission of voice frequency signals in the evolving landscape of 5G communication.