PRS Processing Priority Handling in 5G UEs
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in efficiently processing positioning reference signals (PRS) without measurement gaps, especially when high-priority downlink channels or control resource sets are scheduled during PRS processing windows, leading to potential gaps in signal processing.
Innovation Solution
A method for user equipment (UE) to receive positioning reference signals (PRS) and refrain from processing them during specific conditions, such as when high-priority downlink channels or control resource sets are scheduled, based on conditions like the association with high-priority uplink channels, overlapping channel state information reference signals, or significant differences in reception times, to avoid measurement gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE processes PRS resources during a PRS processing window, then positioning accuracy is improved, but processing complexity and resource conflicts increase when high-priority downlink channels are scheduled
Solution Approach 1:
The patent implements dynamic prioritization where the UE adaptively adjusts PRS processing based on real-time channel conditions and priority levels. The UE determines whether to process PRS resources by evaluating the priority of downlink channels and applying dynamic freezing conditions, allowing the system to flexibly respond to varying traffic requirements while maintaining positioning capability when appropriate
Solution Approach 2:
The patent changes the processing state parameter of PRS resources based on priority evaluation. When high-priority downlink channels are detected, the UE modifies the processing parameter by freezing PRS resources, effectively switching between active processing and suspended states to resolve resource conflicts and manage complexity
2Productivity
If the UE refrains from processing PRS resources when high-priority downlink channels are scheduled, then resource conflicts are reduced, but positioning measurement precision deteriorates
Solution Approach 1:
The system dynamically determines whether to freeze or process PRS resources based on real-time evaluation of downlink channel priorities. The UE assesses the priority relationship between downlink channels and PRS resources, and only applies freezing when high-priority channels are identified, thereby minimizing impact on positioning accuracy while resolving resource conflicts
Solution Approach 2:
The patent applies selective freezing to specific PRS resources based on local conditions. Instead of globally disabling PRS processing, the UE evaluates each PRS processing window independently and applies freezing only to specific resources that conflict with high-priority downlink channels, preserving positioning measurement precision for non-conflicting resources
3Measurement precision
If measurement gaps are introduced for PRS processing, then positioning accuracy is improved, but loss of time and reduced productivity occur
Solution Approach 1:
The patent extracts and eliminates the need for separate measurement gaps by integrating PRS processing into regular processing windows. By implementing priority-based freezing mechanisms, the UE can process PRS resources during normal operation without requiring dedicated measurement gap periods, thereby removing the time loss associated with traditional measurement gap approaches
Solution Approach 2:
The system enables continuous PRS processing by removing the interruption of measurement gaps. The priority-based freezing mechanism allows PRS processing to continue uninterrupted during normal conditions, maintaining continuous positioning capability while only pausing when absolutely necessary due to high-priority downlink channel conflicts
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives positioning reference signal (PRS) resources of a PRS instance, receives at least one symbol of a high priority downlink channel scheduled during a PRS processing window for the PRS instance, wherein the high priority downlink channel is determined to have high priority based on the high priority downlink channel being associated with a high priority uplink channel, and refrains from processing the PRS resources of the PRS instance during the PRS processing window based on one or more conditions related to prioritizing PRS processing, wherein the one or more conditions indicate that the UE does not expect to process the PRS resources of the PRS instance during the PRS processing window based on the at least one symbol of the high priority downlink channel being scheduled during the PRS processing window.