Measurement Gap Configuration for Positioning Reference Signals
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Solution Overview
Problem
Current LTE systems face challenges in configuring measurement gaps for inter-frequency RSTD measurements, leading to incorrect or insufficient configuration of positioning reference signals, which can result in failed or inaccurate positioning measurements.
Innovation Solution
A base station configures measurement gaps based on information about non-serving frequencies, aligning them with the transmission of positioning reference signals from neighboring cells, ensuring more reliable and accurate positioning measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If measurement gaps are configured without frequency-specific alignment information, then the configuration process is simple, but positioning measurement accuracy deteriorates
Solution Approach 1:
The network node performs preliminary actions by obtaining frequency information and calculating appropriate offsets before configuring measurement gaps. This ensures that measurement gaps are pre-aligned with positioning reference signal transmission times, eliminating the need for complex real-time adjustments and ensuring accurate positioning measurements from the outset
Solution Approach 2:
The system changes the parameter of measurement gap timing based on frequency-specific offset calculations. By adjusting the measurement gap offset parameter according to the detected frequency and associated offset values, the system achieves precise alignment with positioning reference signals while maintaining a relatively simple configuration process
2Ease of manufacture
If measurement gaps are not aligned with positioning reference signals, then configuration is easier, but measurement reliability deteriorates
Solution Approach 1:
The network node employs feedback mechanisms by detecting the actual frequency of neighboring cells and using this feedback information to calculate appropriate offsets. This feedback loop ensures that measurement gaps are dynamically adjusted to align with positioning reference signal transmission times, thereby ensuring reliable positioning measurements while keeping the configuration process manageable
Solution Approach 2:
The system performs preliminary frequency detection and offset calculation before configuring measurement gaps. This preliminary action ensures that the measurement gaps are pre-aligned with the timing of positioning reference signals from neighboring cells, preventing measurement failures and ensuring reliable positioning data collection
3Adaptability or versatility
If inter-frequency measurements are performed without proper measurement gap alignment, then the system is more flexible, but measurement quality deteriorates
Solution Approach 1:
The system maintains flexibility for inter-frequency measurements while ensuring measurement quality by changing the measurement gap timing parameters based on detected frequency and associated offsets. This allows the system to adapt to different frequency configurations and neighboring cell arrangements while maintaining precise alignment with positioning reference signals for accurate measurements
Data Source
AI summary
A base station is configured to serve a wireless device in a serving cell on a serving frequency. The base station obtains information that indicates one or more non-serving frequencies on which the device is to perform one or more positioning measurements. These positioning measurements are to be used for determining the device's geographic position. For at least one non-serving frequency indicated by the information, the base station configures a measurement gap during which the device is to perform a corresponding positioning measurement. Specifically, the base station configures such measurement gap to occur during a period of time in which a neighboring cell transmits a positioning reference signal over that non-serving frequency. A positioning reference signal is specifically designed to be a signal on which a device performs positioning measurements. Thus, by aligning the measurement gap with a positioning reference signal, the positioning measurements will prove more reliable and accurate.