Terminal Positioning Using Carrier Phase Measurements in TDD Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current UE positioning methods in 3GPP, such as OTDOA and E-CID, face challenges in achieving high precision due to low positioning accuracy, which is inadequate for 5G wireless communication systems.
Innovation Solution
A method and device that utilize carrier signal phase measurement values from discontinuously sent network signals to improve terminal positioning accuracy, employing phase-locked loops, interpolation, and modulo algorithms to derive accurate phase measurements despite intermittent signal availability in TDD systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier signals are sent discontinuously in TDD systems, then the system can support uplink-downlink switching, but the positioning accuracy deteriorates due to phase-locked loop losing lock and inability to track phase changes
Solution Approach 1:
The patent applies preliminary action by predicting carrier phase changes during uplink transmission intervals before actual positioning measurement is needed. The network side calculates phase change compensation values in advance based on known transmission parameters, so that when the phase-locked loop regains lock in the next downlink frame, the positioning measurement can immediately use accurate phase values without waiting for re-locking.
Solution Approach 2:
The patent introduces an intermediary mechanism - a phase change compensation value - that mediates between the discontinuous carrier signals and the positioning measurement requirement. This compensation value acts as a bridge, allowing the positioning system to maintain accuracy despite the intermittent nature of TDD carrier transmissions by mathematically compensating for phase evolution during signal gaps.
2Measurement precision
If the phase-locked loop continuously tracks carrier phase, then positioning accuracy improves, but the system cannot handle intermittent signal transmission in TDD
Solution Approach 1:
The patent applies periodic action by structure the carrier signal transmission in periodic TDD frames with alternating uplink and downlink periods. The phase-locked loop operates periodically - tracking during downlink frames, maintaining state during uplink frames through compensation, and re-synchronizing at each downlink frame boundary. This periodic operation pattern enables both continuous phase tracking and intermittent signal transmission.
3Measurement precision
If carrier signals are transmitted continuously, then phase-locked loop can maintain lock and achieve high positioning accuracy, but system resources are wasted and uplink-downlink switching is impossible
Solution Approach 1:
The patent applies dynamics by making the phase-locked loop's operation dynamic rather than static. The system adapts its tracking behavior based on the TDD frame structure - actively tracking when downlink signals are present, and using predictive compensation when uplink signals dominate. This dynamic operation mode allows the system to maintain high positioning accuracy while efficiently utilizing resources by not continuously transmitting downlink carrier signals.
Data Source
AI summary
The present application discloses a method and device for determining information, which are used to implement terminal positioning based on carrier signal phase measurement values and improve terminal positioning accuracy. The method for determining information provided by the present application includes: receiving the carrier signal discontinuously sent by the network side; determining the carrier signal phase measurement value for positioning the terminal based on the carrier signal discontinuously sent by the network side.