UTDOA Carrier Selection for Interference Mitigation
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Solution Overview
Problem
In wireless communications networks, existing UTDOA positioning methods face challenges in detecting wireless device transmissions in a sufficient number of non-collocated locations, especially in multi-carrier systems, due to interference and load-related issues, which affect the accuracy and reliability of positioning measurements.
Innovation Solution
A network node with positioning functionality in a multi-carrier system receives interference or load-related information to select the most appropriate carrier for UTDOA positioning measurements, improving the signal-to-noise ratio and reducing interference, thereby enhancing the success probability of UTDOA positioning, especially in high uplink load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UTDOA positioning measurements are performed in multi-carrier systems, then positioning capability is enhanced, but interference and load-related issues reduce detection accuracy in non-collocated locations
Solution Approach 1:
The patent changes the carrier parameter by selecting a specific carrier from multiple available carriers based on interference and load conditions. The network node evaluates interference levels and uplink load for each carrier and selects the optimal carrier for UTDOA measurements, thereby improving measurement precision while maintaining reliability in multi-carrier systems
Solution Approach 2:
The patent introduces an intermediary selection mechanism that acts between the multi-carrier system and the UTDOA positioning process. The network node serves as an intermediary that evaluates carrier conditions and selects the most suitable carrier for positioning measurements, resolving the contradiction between reliability and precision by mediating the measurement process
2Adaptability or versatility
If multiple carriers are used for UTDOA positioning, then positioning coverage is improved, but interference from multiple carriers reduces measurement accuracy
Solution Approach 1:
The patent dynamically changes the carrier parameter by selecting one carrier from multiple available carriers based on real-time interference and load conditions. This allows the system to maintain adaptability across multiple carriers while improving measurement precision by eliminating interference from simultaneous multi-carrier transmissions
Solution Approach 2:
The patent extracts the positioning measurement process from the multi-carrier environment by selecting a single carrier for measurements. This extraction removes the interfering carriers from the measurement process, thereby improving measurement accuracy while preserving the versatility of having multiple carriers available for other purposes
Data Source
AI summary
A method in a network node and a network node with positioning functionality in a wireless communications network in a multi-carrier system are described. The network node enables positioning measurements for a wireless device in the multi-carrier system based on at least one capability indicator that identifies on which carrier frequencies positioning measurements in the multi-carrier system can be performed.