Positioning Accuracy in 5G Wireless Systems via Dynamic Bandwidth Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in accurately estimating reference signal time difference (RSTD) due to path overlaps, which affect positioning accuracy, especially in non-line-of-sight (NLOS) environments, and require increased bandwidth to mitigate these issues.
Innovation Solution
The method involves detecting path overlaps by analyzing channel impulse responses, requesting bandwidth extension for positioning reference signals (PRS) when necessary, and using iterative inter-path interference cancellation techniques to enhance RSTD estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bandwidth is increased to mitigate path overlap effects, then positioning accuracy is improved, but system complexity and resource requirements increase
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the system automatically determines the optimal bandwidth based on detected path overlap conditions. The bandwidth is not fixed but adapts to the channel characteristics, increasing when path overlap is detected and maintaining normal levels when paths are clear, thus resolving the contradiction between accuracy and complexity
Solution Approach 2:
The patent changes the bandwidth parameter dynamically based on the detected degree of path overlap. By monitoring channel impulse response characteristics and adjusting the PRS bandwidth accordingly, the system achieves high positioning accuracy when needed while avoiding unnecessary complexity during normal operation
2Measurement precision
If bandwidth is extended to reduce path overlap interference, then RSTD estimation accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent performs preliminary detection of path overlap conditions by analyzing the channel impulse response before initiating high-precision positioning measurements. This preliminary action allows the system to prepare appropriate bandwidth settings in advance, avoiding the need for complex real-time processing while still achieving accurate RSTD estimation
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors the channel conditions and adjusts the PRS bandwidth based on the detected path overlap. This closed-loop approach ensures that processing complexity is only applied when necessary, maintaining a balance between accuracy and computational requirements
3Measurement precision
If path overlap detection is performed to improve positioning accuracy, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent applies partial action by performing path overlap detection only when necessary, based on preliminary channel conditions. Rather than continuously performing complex analysis, the system uses lightweight initial checks to determine if full-precision measurement is needed, reducing processing time while maintaining accuracy when required
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting higher data rates than a 4th generation (4G) communication system such as long term evolution (LTE). A method for positioning a user equipment (UE) in a wireless communication system includes receiving a reference signal (RS) in a first bandwidth from each of a plurality of anchor nodes scheduled for RS transmission by a network server, determining whether a path overlap has occurred between the UE and the anchor nodes based on symmetry of channel impulse responses of the received RSs, transmitting a bandwidth extension request message to the network server, upon occurrence of a path overlap, receiving an RS in a second bandwidth larger than the first bandwidth from each of the plurality of anchor nodes in response to the transmission of the bandwidth extension request message, and generating information required to position the UE, using the RSs received in the second bandwidth.