Indoor Floor Positioning Using Signal Polarization
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Solution Overview
Problem
Existing indoor positioning technologies, such as ECID, often inaccurately determine the floor location of user equipment (UE) due to incorrect sorting of RSRP or TOA values, leading to incorrect floor estimation.
Innovation Solution
A floor positioning method that determines the polarization direction of reference signals received by UE, using vertical and horizontal polarization antennas to calculate a proportion-related value, which is then used to accurately identify the target access point and determine the UE's floor location based on a preset correspondence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RSRP or TOA values are sorted to determine UE location, then positioning can be implemented using measurement information, but floor location determination becomes inaccurate when access points on different floors have similar signal strengths or when far access points on the same floor have weaker signals than near access points on different floors
Solution Approach 1:
The patent introduces polarization direction as a new dimension for positioning, moving beyond traditional two-dimensional RSRP/TOA sorting. By measuring the polarization direction of reference signals and comparing it with the polarization directions of access points, the system can distinguish between access points on different floors even when their signal strengths are similar, thereby resolving the contradiction between ease of operation and floor location accuracy
Solution Approach 2:
The patent changes the parameter used for positioning from signal strength (RSRP) or time of arrival (TOA) to polarization direction. This parameter change allows the system to accurately determine floor location by comparing polarization directions, overcoming the limitation of signal strength-based methods where far access points may have weaker signals than near access points on different floors
2Device complexity
If signal strength sorting is used to identify the nearest access point, then the positioning process is simple, but incorrect floor estimation occurs when an access point on a different floor has stronger signal than the actual floor's access point
Solution Approach 1:
The patent adds polarization direction measurement as another dimension to the positioning process. Instead of relying solely on signal strength sorting, the system now uses polarization direction comparison to identify the target access point. This resolves the contradiction by maintaining relatively simple processing while dramatically improving floor estimation accuracy, as polarization direction provides a unique identifier for the correct floor
Solution Approach 2:
The patent uses polarization direction as an intermediary parameter to resolve the ambiguity in floor estimation. By introducing this intermediate measurement, the system can distinguish between access points on different floors even when signal strengths are misleading, thereby improving reliability without significantly increasing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides accurate floor location determination by utilizing the polarization direction of reference signals, which reflects signal strength and propagation direction, richer than traditional sorting methods, thereby reducing incorrect floor estimations.
Implementation Method 1
determining measurement information based on a polarization direction of the at least one received reference signal
Data Source
Figure 1
Figure 2-1
Figure 2-2~2-3
AI summary
Embodiments of the present invention provide a floor positioning method and system, and a device, and relate to the communications field. The method includes: receiving a reference signal sent by at least one access point in an indoor environment in which the UE is located; determining measurement information based on a polarization direction of the at least one received reference signal, where the measurement information includes at least one access point identifier and a proportion-related value of a vertical polarization direction relative to the polarization direction of the reference signal corresponding to the at least one access point identifier; sending the measurement information to a positioning server; and receiving location information of the UE sent by the positioning server, where the location information of the UE includes a floor location of the UE, and the floor location of the UE is determined based on the measurement information. The present invention is to resolve a problem in a related technology that floor information of UE is estimated incorrectly, thereby accurately obtaining a floor location of the UE.