Wireless Device Clock Drift Compensation for RTT Estimation
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately estimating round trip time (RTT) due to UE clock drifts and timing adjustments, which affect positioning accuracy in 5G/NR networks, particularly in scenarios with high mobility and disruptive channel events.
Innovation Solution
The system configures and compensates for UE clock drifts and timing adjustments by estimating transmission timing compensation based on configuration information related to the time interval between the reception of a downlink positioning reference signal and the transmission of an uplink sounding reference signal, allowing for improved RTT estimation and positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTT estimation is performed without compensating for UE clock drifts and timing adjustments, then the estimation process is simpler and faster, but positioning accuracy deteriorates
Solution Approach 1:
The system performs preliminary estimation of transmission timing compensation using configuration information before the actual RTT measurement. This preliminary action allows the UE to prepare compensation values in advance, reducing the complexity during the actual measurement process while maintaining positioning accuracy.
Solution Approach 2:
The patent introduces transmission timing compensation as an intermediary parameter that mediates between the raw RTT measurement and the final positioning calculation. This intermediary compensates for clock drifts and timing adjustments, allowing accurate positioning without requiring complex real-time corrections during the measurement process.
2Measurement precision
If transmission timing compensation is estimated using detailed configuration information about time intervals, then RTT estimation accuracy is improved, but processing time and computational resources increase
Solution Approach 1:
The system estimates transmission timing compensation in advance using configuration information that includes time interval details. By performing this estimation preliminarily, the actual RTT measurement process can proceed more quickly without requiring complex real-time calculations, thus reducing overall processing time while maintaining accuracy.
Solution Approach 2:
The patent utilizes parameter changes in the configuration information, specifically the time interval between downlink PRS reception and uplink SRS transmission, to estimate compensation values. By changing the approach from real-time calculation to parameter-based estimation, the system reduces processing time while maintaining RTT estimation accuracy.
3Measurement precision
If the system accounts for UE clock drifts and timing adjustments in RTT estimation, then positioning precision is improved, but the system becomes more complex and harder to implement
Solution Approach 1:
The patent introduces transmission timing compensation as an intermediary mechanism that simplifies the handling of clock drifts and timing adjustments. Instead of implementing complex real-time correction algorithms, the system uses this intermediary parameter that can be estimated from configuration information, reducing implementation complexity while maintaining positioning precision.
Solution Approach 2:
The UE autonomously estimates its own transmission timing compensation using its internal configuration information and the time interval between downlink PRS and uplink SRS. This self-service approach eliminates the need for network-side complex coordination and control, simplifying the overall system implementation while achieving accurate positioning.
Data Source
AI summary
Systems and methods for configuring and performing compensation for UE clock drifts and/or UE timing adjustments for RTT estimations. A wireless device can receive, from a network node, configuration information associated with estimating and reporting transmission timing compensation. The wireless device can estimate a transmission timing compensation for a time interval and report it to the network node. The network node can estimate a round trip time and/or a position of the wireless device based at least in part on the estimated transmission timing compensation.