OTDOA Real-Time Difference Calculation for Wireless Positioning
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Solution Overview
Problem
Current positioning technologies in wireless communication systems, particularly in indoor environments and private LTE-U networks, face limitations in accuracy and response time, necessitating improvements for applications like emergency calls and asset tracking.
Innovation Solution
A method and apparatus for determining the position of user equipment (UE) using Observed Time Difference of Arrival (OTDOA) reference signal time difference (RSTD) measurements from multiple base stations, enabling real-time positioning by calculating differences in signal propagation times and timing between pairs of base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current positioning technologies are used in indoor environments and private LTE-U networks, then positioning can be provided, but positioning accuracy is limited and response time is excessive
Solution Approach 1:
The location server pre-calculates and stores real-time differences (RTDs) between pairs of base stations based on propagation time measurements and OTDOA RSTD measurements from multiple UEs. This preliminary computation of RTDs in advance allows the server to quickly determine UE positions without performing complex calculations during critical positioning events, thereby reducing response time while maintaining accuracy
Solution Approach 2:
The system uses multiple UEs (first UE, second UE, third UE) to collect and report positioning measurements to the location server. By gathering data from multiple sources and creating redundant measurement sets, the system can cross-validate results and improve positioning accuracy through statistical processing while maintaining fast response times
2Measurement precision
If multiple base stations are used for positioning, then positioning accuracy improves, but system complexity increases
Solution Approach 1:
The location server acts as an intermediary that centralizes the complex processing of positioning data. It receives propagation time measurements and OTDOA RSTD measurements from multiple UEs, calculates real-time differences between base station pairs, and determines UE positions. This mediation approach allows multiple base stations to be utilized for improved accuracy while the server manages the computational complexity, preventing the complexity from propagating to the UE devices
Solution Approach 2:
The system transforms raw measurement data (propagation times and RSTD values) into derived parameters (real-time differences between base stations) that simplify the positioning calculation. By changing the parameter representation from raw measurements to processed differences, the system can leverage multiple base stations for accuracy while working with simplified computational parameters
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances positioning accuracy and response time in challenging environments by leveraging OTDOA measurements across multiple base stations, improving support for critical applications such as emergency services and asset tracking within indoor and unlicensed frequency band scenarios.
Implementation Method 1
receiving a first propagation time measurement and a first plurality of observed time difference of arrival (OTDOA) reference signal time difference (RSTD) measurements from a first UE at a first time
Implementation Method 2
receiving a third plurality of OTDOA RSTD measurements from a third UE at a third time, and determining a position of the third UE based at least in part on the at least one real-time difference between the pair of base stations
Data Source
AI summary
Disclosed are techniques for positioning a user equipment (UE). In an aspect, a location server receives a first propagation time measurement and a first plurality of OTDOA RSTD measurements from a first UE at a first time, receives a second propagation time measurement and a second plurality of OTDOA RSTD measurements from a second UE at a second time, determines at least one real-time difference between a pair of base stations based on the first and second propagation time measurements and the first and second pluralities of OTDOA RSTD measurements, wherein the pair of base stations is associated with the first and second pluralities of OTDOA RSTD measurements, receives a third plurality of OTDOA RSTD measurements from a third UE at a third time, and determines a position of the third UE based at least in part on the at least one real-time difference between the pair of base stations.