Reference TP Selection for RSTD Measurements in Shared Cells
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Solution Overview
Problem
In LTE networks, selecting a reference transmission point (TP) for reference signal time difference (RSTD) measurements is challenging, especially in shared cell configurations where multiple TPs have the same physical cell ID, limiting the options for RSTD reference selection and affecting positioning accuracy.
Innovation Solution
A method for controlling reference TP selection, allowing the use of a TP as an RSTD measurement reference, even in shared cells, by receiving assistance information and calculating RSTD measurements, and optionally selecting an alternative TP if the initial reference does not provide acceptable results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference cell is selected for RSTD measurements in a shared cell configuration, then positioning measurements can be performed, but the number of available reference TP options is limited because multiple TPs have the same physical cell ID
Solution Approach 1:
The patent segments the reference cell concept into multiple reference TPs within the same shared cell. Instead of treating the shared cell as a single reference unit, the system identifies and selects specific TPs (e.g., TP1, TP2) as reference TPs based on their individual characteristics and the UE's location, enabling finer-grained reference selection for RSTD measurements.
Solution Approach 2:
The patent introduces a new dimension for reference selection by using TP-specific parameters (such as TP IDs, location information, or signal quality metrics) beyond the physical cell ID. This additional dimension allows the system to distinguish between multiple TPs within the same shared cell and select the most appropriate reference TP for positioning measurements.
2Measurement precision
If multiple TPs are available in a shared cell, then more reference sources could improve positioning accuracy, but the same physical cell ID makes it difficult to distinguish and select optimal reference TPs
Solution Approach 1:
The patent introduces intermediary parameters (such as TP-specific identifiers, location data, or signal quality indicators) that act as mediators between the physical cell ID and the RSTD measurement process. These intermediaries enable the system to differentiate between multiple TPs within a shared cell and select the optimal reference TP without increasing overall system complexity.
Solution Approach 2:
The patent performs preliminary identification and selection of reference TPs before the actual RSTD measurement process. By pre-establishing TP-specific parameters and selection criteria, the system simplifies the measurement process and avoids complex real-time differentiation between multiple TPs with the same physical cell ID.
3Measurement precision
If assistance information is provided for multiple TPs, then better reference selection is possible, but the processing and management of assistance information becomes more complex
Solution Approach 1:
The patent applies local quality by providing TP-specific assistance information tailored to each reference TP's characteristics and the UE's local conditions. Instead of generic assistance data, the system delivers targeted information (such as TP-specific timing, frequency, or location data) that optimizes RSTD measurements for each reference TP while keeping processing manageable through selective provision.
Data Source
AI summary
According to certain embodiments, a wireless device includes an interface and processing circuitry operably coupled to the interface. The interface is configured to receive assistance information from a first node. The assistance information includes data associated with a first reference TP. The first reference TP may be located in a cell having two or more TPs. The processing circuitry is configured to calculate a first reference signal time difference (RSTD) measurement using the data associated with a first reference TP.