UE Positioning Measurement Interval Using Longest PRS Period
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Solution Overview
Problem
In wireless communication systems, the uncertainty in measurement intervals for determining the position of User Equipment (UE) arises due to varying Positioning Reference Signal (PRS) transmission periods across multiple cells, leading to unclear timing for reporting measurement results.
Innovation Solution
A method is introduced where the UE determines a measurement interval using the longest PRS period among multiple cells, allowing for efficient measurement and reporting by starting the RSTD measurement interval from the nearest PRS positioning occasion after OTDOA-related data is transmitted to the physical layer and providing RSTD measurement information to the location server within this interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE uses different measurement intervals for each cell based on their varying PRS periods, then the measurement can be performed according to each cell's signal characteristics, but the timing for reporting measurement results becomes uncertain and complex
Solution Approach 1:
The patent merges multiple cell-specific measurement intervals into a single unified measurement interval by selecting the longest PRS period among all neighbor cells. This allows the UE to perform RSTD measurements for all cells within one common time window, eliminating the complexity of coordinating multiple different reporting timings while maintaining measurement accuracy for each cell.
Solution Approach 2:
The unified measurement interval serves as a universal time window that accommodates measurements for all neighbor cells regardless of their individual PRS periods. This single interval structure provides multi-functionality by enabling the UE to handle cells with different periodicities without requiring separate measurement and reporting mechanisms for each cell.
2Reliability
If the UE waits for the longest PRS period to ensure all cells are measured, then measurement completeness is improved, but the measurement interval duration increases
Solution Approach 1:
The UE performs preliminary identification of all neighbor cells and their respective PRS periods before determining the measurement interval. By advance knowledge of the longest PRS period among neighbor cells, the UE can set the measurement interval duration optimally from the start, ensuring all cells will be measured within this predetermined window without unnecessary delays.
3Measurement precision
If the UE performs measurements for all neighbor cells with varying PRS periods, then positioning accuracy is improved, but the scheduling and coordination of measurements becomes more difficult
Solution Approach 1:
The patent combines the scheduling of measurements for all neighbor cells into a single unified measurement interval based on the longest PRS period. This merging approach allows the UE to coordinate all measurements within one time window, significantly simplifying the scheduling process compared to managing separate intervals for each cell with different periodicities.
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AI summary
A method and apparatus for determining a positioning measurement interval in a wireless communication system are disclosed. The method includes acquiring a message including Observed Time Difference of Arrival (OTDOA) related data in a higher layer, wherein the OTDOA related data includes a plurality of cell identifiers and Positioning Reference Signal (PRS) configuration information of corresponding cells, transmitting the ODTOA related data to a physical layer from the higher layer, and determining the RSTD measurement interval by the following Equation by using a plurality of cell-specific PRS periods obtained using the PRS configuration information in the physical layer: TRSTD = TPRS·(M-1)+ ? where TRSTD denotes the length of the RSTD measurement interval, TPRS denotes the largest of the plurality of cell-specific PRS periods, M denotes the number of PRS positioning occasions, and ? denotes a measurement time for one PRS positioning occasion.