Wireless Positioning Using PRS and DRS Signals
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately estimating the location of terminals, especially in congested areas and in-building environments, due to limitations in positioning reference signals and the increasing demand for higher data speeds and lower latency.
Innovation Solution
A method that utilizes both positioning reference signals (PRS) and discovery reference signals (DRS) for terminal positioning, where the user equipment receives assistance data from multiple base stations, performs measurements using PRS and DRS, and reports the results to a serving base station, effectively leveraging multiple frequencies and signal types to enhance location estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only positioning reference signal (PRS) is used for terminal positioning, then the positioning method is simple, but the positioning accuracy deteriorates in congested areas and in-building environments
Solution Approach 1:
The patent combines positioning reference signals (PRS) and discovery reference signals (DRS) into a unified positioning measurement framework. The user equipment performs measurements on both PRS and DRS, and the network side utilizes both measurement results for positioning calculation, thereby improving positioning accuracy in congested and in-building environments while maintaining reasonable system complexity
2Measurement precision
If multiple reference signals (PRS and DRS) are used for positioning, then the positioning accuracy improves, but the measurement complexity increases
Solution Approach 1:
The patent enables the discovery reference signal (DRS) to serve dual purposes: traditional functions for channel estimation and synchronization, plus positioning measurements. This multi-functionality approach allows the system to improve positioning accuracy without adding entirely new signal structures, thereby limiting the increase in measurement complexity
Solution Approach 2:
The network side pre-configures assistance data containing DRS-related positioning information (such as DRS measurement timing configuration and reference cell information) before the user equipment performs measurements. This preliminary provision of configuration information simplifies the user equipment's measurement process and reduces the complexity of implementing multi-signal positioning
3Speed
If DRS is used for positioning with shorter transmission period, then the positioning update speed increases, but the signal detection difficulty increases
Solution Approach 1:
The patent introduces assistance data as an intermediary that carries DRS configuration information (including timing configuration and reference cell information) from the network to the user equipment. This intermediary mechanism enables the user equipment to efficiently detect and measure short-period DRS signals by having advance knowledge of their transmission characteristics, thereby resolving the contradiction between fast positioning updates and detection difficulty
Data Source
AI summary
Disclosed is a method for performing positioning by a user equipment (UE) in a wireless communication system including: receiving first assistance data including first reference cell information and first neighbor cell information from a first base station (BS) through a first frequency; receiving second assistance data including second reference cell information and second neighbor cell information from a second base station through a second frequency; receiving a positioning reference signal (PRS) on the basis of the first assistance data and receiving a discovery reference signal (DRS) on the basis of the second assistance data; performing measurement using the received PRS and the DRS; and reporting a measurement result to a serving BS.