Asynchronous Vehicular Positioning Using Common Reference Time
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the location of User Equipment (UE) due to clock synchronization errors and limited bandwidth, especially in asynchronous vehicular networks where precise timing and positioning are critical.
Innovation Solution
The method involves an initiator UE sending a reference signal to a responder UE, receiving a responding signal, and exchanging timing data to correlate each other's locations, utilizing both licensed and unlicensed spectra for improved accuracy and bandwidth efficiency, with multiple positioning sessions conducted across various cycles to enhance location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods are used in asynchronous vehicular networks, then device complexity is reduced, but location determination accuracy deteriorates due to clock synchronization errors
Solution Approach 1:
The patent changes the timing parameter reference from local device clocks to a common reference time embedded in positioning messages. By using a common reference time parameter instead of device-specific clock parameters, the system eliminates clock synchronization errors between devices while maintaining protocol feasibility through standardized message structures.
Solution Approach 2:
The patent introduces a common reference time as an intermediary element that mediates timing measurements between devices. This reference time acts as a neutral mediator that both transmitting and receiving devices can use to calculate time differences without requiring their clocks to be synchronized, thus improving accuracy without increasing device complexity.
2Measurement precision
If limited bandwidth is used for positioning signals, then device complexity is reduced, but location determination accuracy deteriorates
Solution Approach 1:
The patent makes the positioning reference signals multi-functional by using the same signal structure for both positioning measurements and normal communication purposes. The reference signals serve dual functions: enabling accurate location determination through time difference measurements and supporting regular data transmission, thus improving accuracy without requiring dedicated additional bandwidth.
Solution Approach 2:
The patent merges positioning signal transmission with existing communication signal structures. By combining positioning reference signals with normal communication channels and using the same time-frequency resources for both purposes, the system achieves accurate positioning without allocating separate dedicated bandwidth, thereby resolving the contradiction between accuracy and bandwidth consumption.
3Measurement precision
If multiple positioning sessions are conducted across various cycles, then location determination accuracy is improved, but time consumption increases
Solution Approach 1:
The patent implements continuous positioning measurements across multiple cycles using the same common reference time mechanism. Devices continuously exchange positioning messages and perform measurements without interruption, accumulating measurement data over time. This continuous operation improves accuracy through multiple samples while minimizing time loss by maintaining uninterrupted measurement sequences rather than stopping and resetting between sessions.
Solution Approach 2:
The patent performs preliminary actions by pre-synchronizing devices to a common reference time frame before positioning sessions begin. Devices prepare measurement configurations and reference time alignments in advance, so that when multiple positioning sessions are conducted, they can proceed without setup delays. This preliminary preparation enables rapid sequential measurements that improve accuracy while minimizing the total time required.
Data Source
AI summary
Disclosed are some examples of techniques for positioning of a user equipment (UE) using positioning reference signal (PRS). One or more units of messages may be communicated between an initiator UE and a responder UE. A unit of message may include a pre-PRS message, a PRS message and a post-PRS message. The pre-PRS message and the post-PRS message may be sent or received using a license spectrum. The PRS message may be sent or received using an unlicensed spectrum. The communication between the initiator UE and the responder UE may be initiated by the initiator UE identifying the responder UE from a plurality of UEs based on positioning properties of the responder UE. The positioning properties of the responder UE may include one or more of a direction, a velocity, a location confidence and a location of the responder UE.