Sidelink Positioning With Moving Anchor Compensation
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Solution Overview
Problem
Sidelink positioning in 5G systems faces challenges such as location changes of moving anchor nodes affecting accuracy, unsuitable slot formats for transmitting positioning reference signals, limited bandwidth in licensed bands, and inadequate procedures for selecting suitable anchor nodes, leading to interference and reduced accuracy.
Innovation Solution
Implement methods for UE-to-UE direct communication that include receiving and transmitting location and assistance information, configuring continuous resources for PRS transmission, and using phase measurement-based positioning with carrier phase methods to enhance accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sidelink positioning is implemented using moving anchor nodes, then positioning coverage is improved, but positioning accuracy deteriorates due to location changes of anchor nodes
Solution Approach 1:
The patent applies preliminary action by having anchor nodes pre-report their location information and assistance information (such as velocity, heading, acceleration) to the network node before positioning measurements are performed. This allows the network to compensate for motion effects during the positioning procedure, thereby maintaining accuracy while using moving anchor nodes to extend coverage.
Solution Approach 2:
The patent implements feedback mechanisms where anchor nodes continuously report their location and motion state information to the network node. The network node uses this feedback to update positioning calculations and compensate for anchor node movement, thereby resolving the contradiction between using moving anchors for coverage and maintaining positioning accuracy.
2Device complexity
If standard slot formats are used for sidelink communication, then resource allocation is simplified, but positioning reference signal transmission is inadequate
Solution Approach 1:
The patent segments the slot structure by introducing specific slot formats designed for positioning purposes. These formats divide the slot into specific regions for PRS transmission, control channels, and data channels, ensuring that PRS can be transmitted reliably without interfering with other signals while maintaining structured resource allocation.
Solution Approach 2:
The patent applies local quality by configuring specific slot formats with particular properties optimized for PRS transmission in certain time-frequency resources. Different slot formats can be selected based on the positioning requirements and channel conditions, allowing localized optimization of PRS transmission quality without affecting the entire resource allocation structure.
3Quantity of substance
If licensed band resources are used for positioning, then spectrum availability is ensured, but bandwidth is limited reducing positioning accuracy
Solution Approach 1:
The patent makes the sidelink interface universal by enabling it to serve both communication and positioning functions. The same frequency resources can be used for both data transmission and positioning reference signals, maximizing the utilization of available licensed spectrum while achieving accurate positioning through multi-functional use of the interface.
Solution Approach 2:
The patent transitions from relying solely on frequency bandwidth to utilizing the time dimension for improving positioning accuracy. By using continuous resources and multiple PRS transmissions over time, the system can achieve high accuracy positioning even with limited bandwidth, effectively adding the time dimension as another degree of freedom for precision.
4Device complexity
If anchor node selection is not optimized, then system complexity is reduced, but interference increases and accuracy decreases
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously select suitable anchor nodes based on predefined criteria such as signal quality, location stability, and geometric distribution. This self-service mechanism allows the system to automatically optimize anchor node selection without requiring complex network-controlled selection procedures, thereby maintaining simplicity while improving accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves positioning accuracy and reliability by addressing issues related to moving anchor nodes, resource allocation, and anchor node selection, enabling precise location determination in 5G systems.
Implementation Method 1
transmitting a positioning reference signal
Data Source
AI summary
A system (1) is disclosed in which a user equipment (UE) (3) is configured for UE-to-UE direct communication. The UE (3) receives, from a network node (5), information for determining a resource for transmission of a positioning reference signal for another UE (3), and transmits the positioning reference signal using a resource which is determined based on using the information.