The fusion of 5G networking with eXtended Reality (XR) technologies opens up new avenues for digital experiences enhanced by precise location-aware capabilities. This thesis explores the potential of integrating 5G Indoor Positioning Systems (IPSs) into Mixed Reality (MR) to enable Location-based Services (LBSs) with accurate and real-time positioning, and proposes a theoretical framework therefor. Through a purposive sampling strategy for exploratory sample, semi-structured expert interviews, and thematic analysis, the research examines the complexities and prospects of combining 5G IPSs and MR. Key findings highlight the promise of such combination in addressing certain identified issues among positioning and XR technologies. The proposed theoretical framework outlines strategic utilisation of 5G and MR for LBS, emphasising the need for new technologies involvement, data processing improvements, and robust security measures. Despite the limitations of current infrastructure and equipment, this research provides insightful contributions and lays a solid groundwork for future advancements in the integration of 5G with MR.