SRS Configuration Constraints for Low-Latency UE Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly in the context of 5G New Radio (NR), face challenges in efficiently utilizing sounding reference signals (SRS) for accurate UE positioning, leading to suboptimal network performance and increased latency.
Innovation Solution
The implementation of configuration constraints for SRS to optimize the transmission and reception of SRS, including beam management and resource allocation, enhances the accuracy and efficiency of UE positioning by aligning transmit and receive beams, thereby improving network performance and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is optimized for positioning accuracy, then positioning precision improves, but network latency increases
Solution Approach 1:
The system performs beam alignment and SRS configuration in advance before positioning measurements are needed. The gNB configures SRS resources and performs receive beam training beforehand, so that when positioning is required, the measurements can be taken immediately without additional setup time, thus improving positioning accuracy while minimizing latency.
Solution Approach 2:
The positioning process is divided into separate phases: beam management phase for aligning transmit and receive beams, and measurement phase for actual positioning. This segmentation allows the system to optimize each phase independently, performing beam alignment once and reusing it for multiple positioning measurements, thereby improving accuracy without proportionally increasing latency.
2Measurement precision
If multiple SRS resources are allocated for positioning, then positioning accuracy improves, but resource complexity increases
Solution Approach 1:
Instead of configuring all possible SRS resources for all beams, the system allocates SRS resources for only the necessary subset of beams that provide sufficient positioning accuracy. The gNB determines the minimum number of beams needed and configures SRS resources accordingly, achieving adequate positioning precision while avoiding the complexity of managing excessive resources.
3Measurement precision
If beam alignment is performed for SRS transmission, then positioning accuracy improves, but processing time increases
Solution Approach 1:
The gNB performs receive beam training and determines optimal receive beams in advance, before actual positioning measurements are required. This preliminary beam alignment allows the system to quickly switch to measurement mode without performing time-consuming beam sweeping during the positioning process, thus achieving high positioning accuracy while minimizing the time penalty.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives at least one of a first type of sounding reference signal (SRS) configuration or a second type of SRS configuration, wherein the first type of SRS configuration is based on a first set of available configurations for SRS received over a first higher layer protocol signaling of a component carrier, wherein the second type of SRS configuration is based on a second set of available configurations for SRS received over a second higher layer protocol signaling, and wherein the first higher layer protocol signaling is different from the second higher layer protocol signaling, and transmits one or more SRS-for-positioning purposes based on the first or second type of SRS configuration.