UE Positioning Scheme Selection for Indoor Accuracy
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Solution Overview
Problem
Current positioning systems in LTE control planes face challenges in seamlessly switching between different positioning schemes, especially when a UE moves from outdoor to indoor environments where satellite signals are unavailable, leading to reduced precision and reliability in indoor positioning.
Innovation Solution
A method and apparatus for selecting and controlling positioning schemes, where a location server provides assistance data with priorities and positioning conditions to the UE, allowing it to sequentially try different schemes until it satisfies the required conditions, ensuring seamless switching between available schemes based on Quality of Service (QoS) parameters and environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS standalone positioning is used, then positioning accuracy is improved, but it becomes unavailable in indoor environments where satellite signals are blocked
Solution Approach 1:
The positioning system is designed to support multiple positioning schemes (GPS standalone, network-assisted GPS, cellular positioning) within a single framework, allowing the UE to function across diverse environments including outdoor and indoor scenarios by selecting the appropriate positioning method based on signal availability and environmental conditions
Solution Approach 2:
The system dynamically selects positioning schemes based on real-time conditions such as signal availability, environmental context, and QoS requirements. The UE can switch between different positioning methods (e.g., from GPS to cellular-based positioning) as conditions change, ensuring continuous and accurate positioning capability
2Adaptability or versatility
If cellular network signal positioning is used, then indoor positioning availability is improved, but positioning precision deteriorates in indoor NLOS environments
Solution Approach 1:
The network side acts as an intermediary by providing assistance data to the UE for A-GNSS positioning. This assistance data includes satellite ephemeris, almanac, and differential calibration information, which enables the UE to perform more accurate positioning even in challenging indoor NLOS conditions by compensating for signal degradation through network-based corrections
3Adaptability or versatility
If multiple positioning schemes are supported, then environmental adaptability is improved, but system complexity increases
Solution Approach 1:
The UE autonomously selects the appropriate positioning scheme based on assistance data received from the network, which includes priority levels and positioning conditions for different schemes. This self-service mechanism eliminates the need for complex network-controlled selection logic, simplifying the overall system while maintaining the ability to support multiple positioning methods
Data Source
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AI summary
The present invention provides a method and device for transmission on unlicensed spectrum in a UE and a base station. In view of the problem of DFS constraints and PHICH resource waste that is caused by communication of an uplink synchronous HARQ on unlicensed spectrum, in the present invention, logical information is configured so that PUSCHs transmitted through different sub-frames on different physical carriers form one logical carrier, and PHICH resources are reserved for the logical carrier. As an embodiment, downlink signaling is sent in a sub-frame for sending a PHICH so as to indicate transmission bandwidth for data retransmission. The solution provided in the present invention saves PHICH resources and eliminates the constraints on the DFS by the synchronous HARQ. Besides, the present invention reuses the CA scheme in the existing LTE as much as possible, and has high compatibility.