5G Terminal Positioning With LOS Base Station Selection
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Solution Overview
Problem
The 5G communication system faces challenges in indoor positioning due to obstacles causing errors in direction estimation and increased positioning errors, and synchronization issues in Ultra-Reliable and Low Latency Communication (URLLC) and sidelink (SL) communication, leading to reduced reliability.
Innovation Solution
A communication system that selects a specific-precision positioning base station capable of direct wave communication for accurate positioning and employs methods to synchronize clocks between UEs for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If base station and UE communicate via reflected waves in indoor environments, then coverage is extended, but positioning accuracy deteriorates due to errors in direction estimation
Solution Approach 1:
The patent introduces a positioning base station as an intermediary entity that specifically handles positioning functions. This positioning base station communicates via direct waves (line-of-sight) with the UE, serving as a dedicated mediator for positioning measurements. The serving base station continues to provide general communication services, while the positioning base station (which may be a different entity) provides accurate positioning by eliminating reflected wave interference through direct wave communication.
2Adaptability or versatility
If clocks between UEs are not synchronized in URLLC and sidelink communication, then device autonomy is maintained, but communication reliability deteriorates
Solution Approach 1:
The patent implements preliminary clock synchronization between UEs before URLLC and sidelink communication occurs. By synchronizing clocks in advance (pre-action), the system ensures that timing-critical operations can proceed with high reliability. The synchronization is established beforehand so that when actual communication happens, the UEs are already time-aligned, enabling accurate timing measurements and reliable communication without requiring continuous network intervention.
Data Source
AI summary
A communication terminal apparatus in a communication system that includes the communication terminal apparatus, and a base station apparatus configured to communicate with the communication terminal apparatus. The communication terminal apparatus is configured to estimate whether the communication terminal apparatus and the base station apparatus are in line-of-sight positions, by using a downlink signal transmitted from the base station apparatus.