5GPS: 5G Femtocell Placement Strategies for Ultra-Precise Indoor Localization in the Metaverse

Mobile networks are rapidly evolving to cater to the expanding range of applications. The design of 5G deployments incorporates the concept of network slices, which are end-to-end logically isolated segments that provide distinct services. Within this delivery framework, augmented and virtual reality (AR/VR) wearables have gained prominence as a service type, thereby assuming a pivotal role in the realization of the Metaverse. Beyond the imperative need for stringent latency control, the successful implementation of the Metaverse relies significantly on the precise localization of user equipment (UE) within a three-dimensional (3D) environment. As the successor to the preceding 4G Long-Term Evolution (LTE), 5G networks operate at higher frequency ranges and denser deployment configurations. Within such dynamic contexts, ensuring high-precision indoor localization becomes a formidable challenge due to the unique signal characteristics associated with higher frequencies. In pursuit of this objective, we introduce the 5GPS framework, which leverages established third-generation partnership project (3GPP) principles to conceptualize a radio access network (RAN) comprising 5G femtocells. This framework facilitates the offloading of positioning tasks from outdoor base stations (BSs) to enhance indoor positioning capabilities. The core contribution of our study lies in illustrating the pivotal impact of the spatial arrangement of 5G femtocells on the precision of positioning for AR/VR Metaverse wearable devices. To address this, we present a novel optimization framework for tackling the NP-Hard problem associated with fem-to cell deployment, thereby providing a comprehensive solution. We demonstrate that the utilization of our optimal placement solution results in a substantial enhancement in positioning accuracy when contrasted with arbitrary anchor deployments.