CSI-RS Positioning Rate Matching and Time Offset Configuration
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Solution Overview
Problem
Current wireless networks face challenges in accurately using Channel State Information Reference Signals (CSI-RS) for positioning due to limited configuration options and interference, which affects the detection of neighboring cells, especially in real-world scenarios with high interference levels.
Innovation Solution
The method involves configuring CSI-RS resources for positioning by determining and transmitting CSI-RS configurations to wireless devices, allowing them to perform accurate time of arrival measurements and relative time difference calculations, and adapting these configurations based on user equipment capabilities to enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS is used for positioning measurements, then positioning capability is enhanced, but detection reliability deteriorates due to interference from other reference signals
Solution Approach 1:
The patent segments the reference signal resources by introducing distinct time offsets for serving cell CSI-RS and neighboring cell CSI-RS measurements. This temporal segmentation allows the wireless device to separately measure serving and neighboring cells without mutual interference, thereby maintaining both positioning accuracy and detection reliability
Solution Approach 2:
The patent implements periodic measurement opportunities with configured periodicities for CSI-RS resources. By scheduling measurements at specific periodic intervals and using different time offsets for different cells, the system ensures reliable detection while maintaining accurate positioning measurements through structured periodic action
2Measurement precision
If CSI-RS resources are allocated for positioning, then positioning functionality is improved, but resource utilization efficiency deteriorates due to rate matching requirements
Solution Approach 1:
The patent applies preliminary rate matching around CSI-RS resources before data transmission. By pre-configuring rate matching patterns that exclude CSI-RS resource elements, the system ensures accurate positioning measurements while efficiently utilizing the remaining resources for data transmission without collision
Solution Approach 2:
The patent applies rate matching selectively only in the local regions where CSI-RS resources are allocated, rather than uniformly across all resources. This localized approach preserves measurement accuracy at CSI-RS positions while maintaining high resource utilization efficiency in non-CSI-RS regions
Data Source
AI summary
Embodiments of the disclosure provide methods, apparatus and machine-readable mediums relating to reference signals for positioning in a wireless network. A method performed by a wireless device relating to positioning in a wireless network is provided. The method comprises receiving user data, and a reference signal for positioning in a transmission from a radio network node. The method further comprises rate matching the user data over one or more radio resources not used by the reference signal.