Carrier Phase Positioning Signaling for Integer Ambiguity Resolution
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in achieving sub-meter level accuracy and low latency for carrier phase-based positioning due to integer ambiguity and error sources such as Carrier Frequency Offset, Doppler shift, oscillator drift, and multi-path interference, which degrade the accuracy of carrier phase measurements.
Innovation Solution
Implement methods for carrier phase-based positioning that include channel bandwidth adaptation, error mitigation techniques, and signaling protocols to resolve integer ambiguity, using reference signals like PRS and SRS for accurate distance measurement between transmitter and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier phase-based positioning is implemented in 5G systems, then positioning accuracy can be improved, but integer ambiguity and error sources (Carrier Frequency Offset, Doppler shift, oscillator drift, multi-path interference) degrade the measurement accuracy
Solution Approach 1:
The patent applies preliminary action by performing capability signaling exchanges between gNBs and UEs before actual positioning measurements. The gNB transmits capability information including supported frequency resources, positioning methods, and integer ambiguity resolution techniques. This advance preparation allows the system to configure appropriate measurement parameters and resolve potential issues before they affect measurement reliability, thereby improving both positioning accuracy and measurement reliability simultaneously
Solution Approach 2:
The patent introduces capability information signaling as an intermediary mechanism between the gNB and UE. This signaling exchange provides a framework for negotiating and establishing the conditions under which carrier phase measurements will be performed, including specifying frequency resources, measurement granularities, and integer ambiguity resolution techniques. This intermediary layer enables the system to coordinate measurements in a way that maintains both high accuracy and reliability
2Measurement precision
If multiple frequency resources are used for carrier phase measurements, then positioning accuracy improves, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the carrier phase measurement process into distinct capability signaling and measurement execution phases. The capability information is segmented into specific components (supported frequency resources, positioning methods, measurement granularities, integer ambiguity resolution techniques). This segmentation allows the system to manage multiple frequency resources systematically, improving positioning accuracy while keeping system complexity manageable through structured organization
Solution Approach 2:
The patent implements dynamics by making the measurement configuration adaptive through capability signaling. The gNB and UE exchange capability information to dynamically determine the appropriate frequency resources and measurement parameters based on actual system conditions and capabilities. This dynamic approach allows the system to optimize positioning accuracy using multiple frequency resources when needed, while reducing complexity by using fewer resources when conditions don't require them
Data Source
AI summary
A method for positioning in a wireless communication system is described. The method comprises receiving, by a second node (102), a capability-request signal from a first node (106). The second node (102) transmits a capability-response signal to the first node (106). The second node (102) transmits an assistance information to the first node (106). The second node (102) transmits the configuration of the at least one reference signal to a third node (104). The second node (102) receives a reference signal from the third node (104). The second node (102) performs measurement on the reference signal and transmits report comprising the measurement to the first node (106), where the first node (106) estimates a position of the third node (104) based on the report received from the second node (102).