Adaptive Carrier Phase Reporting for Doppler-Aware Positioning
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Solution Overview
Problem
Carrier phase measurements in positioning systems are hindered by errors due to the Doppler frequency, which depends on the velocity of the transmitting/receiving device, leading to inaccurate device positioning.
Innovation Solution
Adapt the rate of carrier phase measurements and reporting based on the velocity of a device moving through the network, using carrier frequency and velocity to determine appropriate update and reporting rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If carrier phase measurements are performed at a fixed high rate, then measurement precision is improved, but device complexity and energy consumption increase due to unnecessary updates when device velocity is low
Solution Approach 1:
The patent applies dynamics by making the carrier phase measurement update rate adaptive rather than fixed. The measurement rate is dynamically adjusted based on the device's velocity, switching between higher rates when velocity is high and lower rates when velocity is low, thereby optimizing the balance between measurement precision and system complexity
Solution Approach 2:
The patent changes the parameter of measurement update rate based on velocity conditions. By monitoring velocity and adjusting the update rate accordingly, the system maintains measurement precision when needed while reducing complexity during low-velocity periods
2Measurement precision
If carrier phase measurements are updated at a high rate, then positioning accuracy is improved, but energy consumption increases due to continuous Doppler frequency compensation
Solution Approach 1:
The system dynamically adjusts the measurement update rate based on velocity, reducing updates during low-velocity periods when Doppler effects are minimal, thereby lowering energy consumption while maintaining positioning accuracy when high updates are needed
Solution Approach 2:
The patent implements periodic measurement updates with variable periods. Instead of continuous updates, the system uses periodic updates with adjusted periods based on velocity conditions, reducing the total number of updates and associated energy consumption while maintaining sufficient positioning accuracy
3Use of energy by moving object
If the measurement update rate is reduced to save energy, then energy consumption decreases, but measurement precision deteriorates when device velocity is high
Solution Approach 1:
The system dynamically adjusts the measurement update rate based on real-time velocity detection. When velocity exceeds a threshold, the system switches to a higher update rate to maintain precision; when velocity is below the threshold, it reduces the update rate to save energy
Solution Approach 2:
The patent uses velocity feedback to control the measurement update rate. The system continuously monitors velocity and uses this feedback information to adjust the update rate accordingly, ensuring precision is maintained when needed while optimizing energy consumption during low-velocity periods
4Device complexity
If a fixed measurement update rate is used, then device complexity is reduced, but adaptability to different velocity conditions deteriorates
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the measurement update rate to change based on velocity conditions. This dynamic approach adds minimal complexity while significantly improving the system's ability to adapt to varying velocity conditions
Solution Approach 2:
The system changes the measurement rate parameter based on velocity thresholds. By implementing threshold-based parameter adjustment, the system achieves adaptability to different velocity conditions without requiring complex control mechanisms
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 approach enables accurate carrier phase measurements by removing the effect of Doppler frequency, resulting in more precise device positioning and estimation.
Implementation Method 1
The rate of carrier phase change depends on the Doppler frequency of the carrier signal. The Doppler frequency, in turn, depends on the velocity of the transmitting/receiving device (e.g., User Equipment (UE)).
Data Source
AI summary
The present disclosure provides a method in a network node for carrier phase measurements in a communication network. The method includes: obtaining a carrier phase measurement update rate for a UE moving through the network, based on a carrier frequency and a velocity of the UE; and sending the carrier phase measurement update rate to the UE in a carrier phase measurement update rate configuration.