PRS Resource Allocation Pattern Diversity for Interference Reduction
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Solution Overview
Problem
In wireless communication systems, the existing methods for transmitting Positioning Reference Signals (PRS) face challenges in minimizing interference between adjacent cells, especially in environments with a high density of small cells, leading to redundancy and inaccurate location measurement due to limited time-frequency patterns and resource element overlap.
Innovation Solution
A method and apparatus that determine resource element allocation patterns for PRS using a random number, allowing for diverse combinations of PRS patterns and minimizing interference by transmitting PRSs in extended time or frequency space, thereby increasing the PRS reuse rate and accuracy of location measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of PRS patterns are configured to minimize interference between adjacent cells, then location measurement accuracy is improved, but resource element overlap increases causing redundancy and system inefficiency
Solution Approach 1:
The patent segments the PRS resource allocation into multiple patterns (first pattern and second pattern) that can be selectively applied. Different patterns are assigned to different cells or transmission occasions, allowing the system to achieve diversity without requiring all patterns to be simultaneously active, thus reducing resource element overlap while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces dynamic selection of PRS patterns based on cell ID, transmission occasion, or other parameters. Instead of statically configuring all patterns, the system dynamically chooses which pattern to use, enabling efficient resource utilization while providing sufficient pattern diversity for accurate location measurement in dense small cell environments.
2Device complexity
If limited time-frequency patterns are used for PRS transmission, then system complexity is reduced, but interference between adjacent cells increases leading to poor correlation attributes
Solution Approach 1:
The patent applies different PRS patterns (first pattern and second pattern) to different local contexts such as different cells, different transmission occasions, or different resource blocks. This local differentiation ensures that adjacent cells using the same physical resources maintain low cross-correlation, improving reliability without increasing overall system complexity.
Solution Approach 2:
The patent introduces additional dimensions for pattern differentiation beyond the basic time-frequency grid, such as pattern type (first/second pattern), cell ID-based selection, or transmission occasion-based selection. This dimensional expansion allows the system to achieve better correlation attributes with the same limited time-frequency resources.
3Area of stationary object
If PRS patterns are transmitted in dense small cell environments, then location service coverage is improved, but resource element overlap causes interference and measurement inaccuracy
Solution Approach 1:
The patent combines multiple PRS patterns (first pattern and second pattern) in a coordinated manner across multiple cells. By merging the use of different patterns in different cells or transmission occasions, the system achieves broader coverage while maintaining measurement accuracy through pattern diversity that reduces interference in dense small cell deployments.
Data Source
AI summary
The present invention relates to a method for transmitting and receiving a positioning reference signal (PRS) in a wireless communication system. More specifically, the present invention relates to a detailed method and device for setting a transmission pattern for the PRS. Provided in one embodiment is a method by which a terminal receives the PRS, and a terminal device, the method comprising the steps of: monitoring the PRS in one PRS monitoring section; receiving the PRS in one or more consecutive subframes included in the one PRS monitoring section; and transmitting, to a base station, information for a position measurement by using reception time information of the PRS, wherein a resource element allocation pattern of the PRS is determined by a random number.