RTT Positioning Using Timing Advance Without Base Station Synchronization
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the transmission-reception time difference for RTT-based positioning of terminal devices, especially when strict synchronization between base stations is difficult to achieve, leading to significant ranging errors.
Innovation Solution
Utilize timing advance (TA) information to determine the transmission-reception time difference for RTT positioning, allowing the network side to calculate this difference without requiring direct reporting from the terminal device, thereby reducing power and resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strict synchronization between base stations is implemented for RTT positioning, then positioning accuracy is improved, but system complexity and difficulty of implementation increase significantly
Solution Approach 1:
The patent introduces TA (timing advance) information as an intermediary to bridge the timing difference between base stations. Instead of requiring direct synchronization between base stations, the network side uses TA values to calculate and compensate for timing offsets, enabling accurate RTT positioning without strict inter-base-station synchronization.
Solution Approach 2:
The network side autonomously calculates the transmission-reception time difference using TA information without requiring terminal devices to report this data. This self-service approach reduces signaling overhead and simplifies the positioning process while maintaining accuracy.
2Measurement precision
If terminal devices report transmission-reception time difference for RTT positioning, then positioning accuracy is improved, but power consumption and resource usage increase
Solution Approach 1:
The network side performs self-calibration by autonomously calculating the transmission-reception time difference using existing TA information. This eliminates the need for terminal devices to measure and report this parameter, reducing their power consumption and resource usage while maintaining positioning accuracy.
Solution Approach 2:
The patent transforms the positioning approach by changing from requiring terminal-reported time differences to using network-calculated time differences based on TA parameters. This parameter substitution reduces terminal device involvement and associated energy consumption.
Data Source
AI summary
A wireless communication method, a terminal device, a base station and a positioning server are provided. One example method includes: receiving, by a terminal device, a first positioning signal from a base station; transmitting, by the terminal device, a second positioning signal to the base station; where the first positioning signal and the second positioning signal are configured for round-trip time (RTT) positioning of the terminal device, a time at which the terminal device receives the first positioning signal is a first time, a time at which the terminal device transmits the second positioning signal is a second time, a difference between the first time and the second time is a first difference value, and the first difference value is determined based on a timing advance (TA).