Cell Positioning Mode Switch for Accuracy
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Solution Overview
Problem
The introduction of RRM measurement relaxation in new generation communication systems leads to reduced positioning accuracy for terminals, especially at the cell edge with low mobility, as it extends measurement intervals and may prevent neighbor cell measurements, making it difficult for stationary users to perform accurate positioning.
Innovation Solution
A method and apparatus for requesting a positioning mode switch from the core network device, allowing for more accurate positioning by determining unsupported positioning modes and sending request information to switch to a supported mode, thereby improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If RRM measurement relaxation is applied to reduce energy consumption, then energy consumption is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent implements dynamic positioning mode switching based on terminal mobility state. The network device determines whether the terminal is stationary or mobile and selects appropriate positioning modes accordingly. For stationary terminals with measurement relaxation, E-CID mode is used; for mobile terminals, DL-TDOA mode is used. This dynamic adaptation resolves the contradiction by allowing measurement relaxation for stationary terminals while maintaining accurate positioning through mode switching.
Solution Approach 2:
The patent changes the positioning mode parameter based on terminal characteristics and network configuration. By switching between E-CID and DL-TDOA positioning modes, the system adapts to different scenarios. This parameter change enables the system to maintain positioning accuracy even when measurement relaxation is applied, as the selected positioning mode compensates for the relaxed measurement requirements.
2Duration of action of moving object
If measurement interval is extended for relaxation, then energy consumption is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The system dynamically adjusts the measurement interval based on the selected positioning mode. For E-CID positioning mode used with stationary terminals, a longer measurement interval is acceptable and configured. For DL-TDOA positioning mode used with mobile terminals, a shorter measurement interval is configured to maintain accuracy. This dynamic adjustment resolves the contradiction between extended measurement interval and positioning accuracy.
Solution Approach 2:
The patent applies different measurement interval configurations to different terminal types and positioning modes. Stationary terminals using E-CID mode receive relaxed measurement intervals, while mobile terminals using DL-TDOA mode receive stricter measurement intervals. This localized quality adjustment ensures each terminal receives appropriate measurement requirements based on its specific needs, resolving the contradiction locally for each terminal rather than applying a uniform approach.
3Use of energy by moving object
If E-CID positioning mode is used with measurement relaxation, then energy consumption is reduced, but positioning accuracy deteriorates
Solution Approach 1:
The patent implements dynamic positioning mode selection where E-CID mode is specifically chosen for stationary terminals that can tolerate measurement relaxation, while DL-TDOA mode is chosen for mobile terminals requiring higher accuracy. The network device determines terminal mobility state and selects the appropriate mode accordingly. This dynamic selection allows E-CID mode to be used with measurement relaxation only when appropriate, resolving the contradiction by ensuring E-CID with relaxation is applied only to terminals where it remains accurate.
Data Source
AI summary
A cell positioning method includes determining that the terminal does not support a current positioning mode, and sending request information to a radio access network device. The request information is used for requesting a core network device to perform positioning mode switch for the terminal.