Carrier Phase Positioning Center Frequency Identifier Configuration
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Solution Overview
Problem
Current mobile and wireless telecommunication systems, particularly in 5G NR, face challenges in avoiding measurement errors due to center frequency discrepancies between carrier phase (CP) measurements and reference signals transmissions in uplink (UL) and downlink (DL) CP positioning.
Innovation Solution
The proposed solution involves the Location Management Function (LMF) instructing network entities or user equipment (UE) to report CP measurements using predefined center frequency identifiers that span the bandwidth of SRS transmission in UL CP positioning or the DL PFL of PRS transmission in DL CP positioning, thereby maintaining relative phase coherence across measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CP measurements are performed without specifying center frequency identifiers, then measurement flexibility is maintained, but positioning accuracy deteriorates due to center frequency discrepancies
Solution Approach 1:
The patent introduces center frequency identifier configurations as a new parameter to specify the exact center frequencies used in CP measurements. By changing the measurement configuration to include these identifiers, the system resolves the center frequency discrepancy issue and improves positioning accuracy without significantly increasing overall system complexity
Solution Approach 2:
The patent uses center frequency identifiers as an intermediary element between the measurement configuration and the actual CP measurements. These identifiers act as a mediator that ensures both the transmitting and receiving entities use the same center frequency references, thereby eliminating measurement errors while maintaining a structured and manageable configuration approach
2Measurement precision
If multiple center frequency identifiers are configured for CP measurements, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the center frequency configuration into multiple discrete center frequency identifiers, each corresponding to a specific frequency point. This segmentation allows the system to precisely specify which frequencies are used for measurements, improving accuracy while managing signaling overhead by only transmitting the necessary identifier indices rather than full frequency values
3Reliability
If center frequency identifiers are not reported with CP measurements, then reporting simplicity is maintained, but measurement reliability deteriorates due to frequency mismatches
Solution Approach 1:
The patent implements preliminary configuration of center frequency identifiers before the actual CP measurements are performed. By pre-establishing the frequency reference points and their identifiers, the system ensures that both transmitting and receiving entities are synchronized on the same frequency references, thereby guaranteeing measurement reliability while keeping the reporting process straightforward
Data Source
AI summary
Systems and apparatus for avoiding measurement errors include transmitting, by a LMF, to at least one of a network entity or a user equipment, a request to obtain at least one carrier phase measurement using at least one center frequency identifier configuration for at least one positioning reference signal, wherein the at least one positioning reference signal includes at least one uplink SRS or DL PRS.