SL-PRS Status Reporting for Collision-Aware Sidelink Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly in the context of 5G, face challenges in efficiently managing sidelink positioning reference signals (SL-PRS) for accurate positioning and resource allocation, especially in device-to-device communication scenarios, which can lead to collisions and inefficiencies.
Innovation Solution
A user equipment (UE) is configured to receive and determine the sidelink transmission status of SL-PRS resources based on signal strength measurements and availability information, and can transmit SL-PRS in an inactive state of location-based discontinuous reception (DRX) mode, or on-demand, while avoiding collisions with requested transmission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL-PRS resources are allocated for transmission by multiple sidelink UEs, then positioning accuracy is improved, but resource collisions and inefficiencies occur
Solution Approach 1:
The network entity pre-configures SL-PRS resources and determines transmission status before actual transmission occurs. The UE receives configuration of SL-PRS resources and determines transmission status based on signal strength measurements and availability information in advance, preventing collisions before they happen
Solution Approach 2:
The system implements feedback mechanisms where UEs measure signal strength of SL-PRS resources and report availability information. The network entity uses this feedback to determine transmission status and allocate resources dynamically, improving both positioning accuracy and resource efficiency
2Measurement precision
If UEs transmit SL-PRS continuously for accurate positioning, then positioning accuracy is improved, but energy consumption increases
Solution Approach 1:
Instead of continuous transmission, the system uses discontinuous reception (DRX) mode where UEs transmit SL-PRS periodically or on-demand. The UE can be configured with DRX parameters and transmit SL-PRS only during active periods or when triggered by location-based events, reducing energy consumption while maintaining positioning accuracy
Solution Approach 2:
The UE autonomously determines when to transmit SL-PRS based on its location information and DRX configuration. The UE obtains its location and decides whether to transmit SL-PRS during inactive states without continuous network control, enabling energy-efficient on-demand transmission
3Productivity
If UEs determine transmission status based on signal strength measurements, then resource allocation efficiency is improved, but measurement complexity increases
Solution Approach 1:
The UE performs signal strength measurements on a subset or first set of SL-PRS resources rather than all possible resources. This partial measurement approach provides sufficient information for transmission status determination without the full complexity of measuring every resource
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives a configuration of a first set of sidelink positioning reference signal (SL-PRS) resources configured for transmission by a first set of sidelink UEs including the UE and determines a sidelink transmission status of a first subset of SL-PRS resources of the first set of SL-PRS resources based on signal strength measurements of the first set of SL-PRS resources, availability information for the first set of SL-PRS resources, or both. The sidelink transmission status of a given UE may also be inferred from configuration information associated with the given UE and received at the UE.