Sidelink PRS Association for Accurate RTT Positioning
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Solution Overview
Problem
In the context of 5G sidelink communication, the adjustment of TUE-TX to actual sending time of positioning reference signals (PRS) complicates the measurement quantity for round-trip time (RTT) positioning, necessitating a flexible indication of measurement requirements between devices.
Innovation Solution
A method is provided where a first device sends request and indication information to a second device to measure and report positioning reference signals, using identifiers or time windows to flexibly indicate measurement requirements, enabling flexible measurement operations and reduced signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If TUE-TX is adjusted to actual sending time of PRS, then positioning measurement accuracy is improved, but measurement requirement indication complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where the network side device acts as a mediator between the terminal device and the measurement process. The network side device receives measurement configuration information from the terminal, determines the associated PRS pair, and sends measurement instructions to the other terminal device. This intermediary approach simplifies the indication process while maintaining measurement accuracy under the adjusted TUE-TX paradigm.
Solution Approach 2:
The patent applies preliminary action by having the network side device pre-determine the association relationship between PRS pairs before the actual measurement takes place. The network side device receives configuration information, determines which PRS should be associated with which, and prepares measurement instructions in advance. This preliminary determination eliminates the need for complex real-time indication mechanisms while ensuring accurate positioning measurements.
2Adaptability or versatility
If PRS association indication is added to measurement requests, then measurement requirement flexibility is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the PRS association indication function from the measurement request message and relocates it to the network side device's processing logic. Instead of embedding complex association indications in the signaling messages, the network side device determines the PRS association relationship independently and only transmits necessary measurement instructions. This extraction approach maintains measurement flexibility while significantly reducing signaling overhead.
Solution Approach 2:
The patent applies universality by designing the measurement configuration information to serve multiple functions. The same configuration information received by the network side device is used to: (1) determine PRS association relationships, (2) generate measurement instructions, and (3) facilitate positioning measurements. This multi-functional approach eliminates the need for separate indication mechanisms, reducing signaling overhead while maintaining flexibility.
Data Source
AI summary
This application provides a method for positioning. The method includes: A first device sends request information and indication information to a second device, where the request information is used for requesting the second device to report a first measurement quantity, the first measurement quantity is used for determining a distance between the first device and the second device, and the indication information indicates that a first positioning reference signal is associated with a second positioning reference signal. The first device receives a response message from the second device, where the response message includes information about the first measurement quantity, an identifier of the first positioning reference signal, and an identifier of the second positioning reference signal, and the first measurement quantity is a measurement quantity obtained by the second device by measuring the first positioning reference signal and the second positioning reference signal.