PRS Frequency Shift Mapping for Uniform Subcarrier Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for transmitting positioning reference signals (PRS) in wireless communication systems face challenges in achieving uniform distribution of PRS symbols across subcarriers, leading to larger auto-correlation side peak values and reduced positioning performance.
Innovation Solution
The method involves determining a time-frequency resource for PRS transmission based on configuration information, including PRS frequency domain resource information and time domain configuration, to uniformly distribute PRS symbols across all subcarriers, and implementing a muting mechanism to support multi-beam transmission and improve detectability in dense environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PRS symbols are mapped to time-frequency resources using conventional methods, then the PRS transmission can be implemented, but the PRS symbols are not uniformly distributed across subcarriers leading to larger auto-correlation side peak values
Solution Approach 1:
The patent changes the mapping parameters by correlating PRS RE frequency shift information with PRS OFDM symbol index values. This parameter change ensures uniform distribution of PRS symbols across all subcarriers, reducing auto-correlation side peak values and improving positioning measurement precision.
2Reliability
If PRS is transmitted without muting mechanism, then the transmission simplicity is maintained, but the detectability in dense environments and multi-beam scenarios is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring muting patterns and muting sequences before PRS transmission. The base station determines muted and unmuted PRS blocks or resource sets in advance, allowing the terminal to efficiently detect PRS in dense environments and multi-beam scenarios without attempting to detect muted resources, thereby improving reliability while managing complexity.
3Productivity
If PRS resources are not optimized, then the resource allocation is simple, but the resource utilization efficiency and positioning performance are reduced
Solution Approach 1:
The patent segments PRS resources into multiple PRS blocks and resource sets, allowing fine-grained control and optimization. By dividing the PRS occasion into manageable units (resource sets and blocks), the system can optimize resource allocation for different beams and scenarios, improving productivity while the configuration information manages the complexity.
Solution Approach 2:
The patent introduces dynamic resource allocation through configurable PRS parameters including frequency domain resource information, time domain configuration, and muting patterns. The base station can dynamically adjust PRS resource allocation based on network conditions, beam configurations, and terminal requirements, optimizing resource utilization efficiency while maintaining manageable complexity through standardized configuration mechanisms.
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
Disclosed are a method and device for transmitting a positioning reference signal. The method comprises: a base station determining a time-frequency resource for sending a PRS according to configuration information of the PRS, mapping a PRS sequence to the time-frequency resource for sending the PRS, and sending the mapped PRS on the time-frequency resource for sending the PRS, wherein the configuration information of the PRS comprises PRS frequency domain resource information; the PRS frequency domain resource information comprises PRS resource element (RE) frequency shift information, and the PRS RE frequency shift information is correlated with a PRS OFDM symbol index value calculated from a PRS occasion.