Transmission Timing Adjustment for Wireless Positioning Accuracy
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Solution Overview
Problem
Current positioning technologies in wireless communication, such as those used in LTE and 5G networks, face challenges in achieving accurate location estimation due to timing errors in signal transmission and reception, which affect the precision of techniques like downlink time difference of arrival (DL-TDoA) and uplink time difference of arrival (UL-TDoA).
Innovation Solution
The proposed solution involves an apparatus and method that transmit and receive reference signals, with a message indicating transmission timing changes, to determine positioning measurement values and time difference information, thereby improving positioning accuracy by mitigating UE and gNB Rx/Tx timing delays. This is achieved through the use of a system with a location management function, a first network element, and a second network element that adjust transmission timing based on received signals to maintain a consistent RxTx timing error group (TEG) within a specified error range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission timing adjustments are made to maintain consistent RxTx timing error group (TEG), then positioning accuracy is improved, but device complexity increases due to additional timing management and message transmission requirements
Solution Approach 1:
The transmitting device performs transmission timing adjustments before positioning measurements are taken, maintaining a consistent RxTx timing error group (TEG) throughout the measurement period. This preliminary timing synchronization ensures that timing errors remain within acceptable ranges, thereby improving positioning accuracy without requiring complex real-time adjustments during measurement
Solution Approach 2:
The system transmits messages indicating transmission timing changes between the transmitting and receiving devices. The receiving device uses this feedback information to adjust its timing measurements, compensating for timing variations while maintaining positioning accuracy. This feedback mechanism allows the system to manage timing errors systematically without excessive complexity
2Measurement precision
If transmission timing changes are communicated through messages with vectors indicating timing changes, then positioning measurement accuracy is improved, but signaling overhead increases
Solution Approach 1:
The timing change information is segmented into structured messages containing vectors that indicate specific timing changes for different transmission occasions. Each vector element corresponds to a specific time window or transmission event, allowing the receiving device to process only the relevant timing adjustments without receiving redundant information, thereby reducing overall signaling overhead while maintaining measurement accuracy
Solution Approach 2:
The system changes the parameter representation of timing information by using compact vector formats that encode timing changes efficiently. Instead of transmitting full timing sequences, the system transmits differential timing changes as parameters, reducing the amount of signaling data required while preserving the precision needed for accurate positioning measurements
Data Source
AI summary
Disclosed is a method comprising receiving one or more first reference signals; transmitting one or more second reference signals; receiving a message comprising at least a first vector, wherein the first vector comprises one or more values indicating one or more transmission timing changes associated with one or more transmission occasions of the one or more first reference signals within a time window; determining one or more positioning measurement values based at least partly on the one or more first reference signals and the message; determining time difference information between a reception time of the one or more first reference signals and a transmission time of the one or more second reference signals; and transmitting a report indicating the one or more positioning measurement values and the time difference information.