Prioritizing CORESETs for Beam Failure Recovery
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, beam failure recovery can be hindered when search spaces for control resource sets (CORESETs) overlap, causing a UE to miss the beam failure recovery response due to lack of prioritization, leading to delayed or failed recovery.
Innovation Solution
A base station allocates time-frequency resources and assigns priorities to CORESETs or search spaces, with the highest priority given to those involved in beam failure recovery (BFR), ensuring that the UE monitors the correct channel even during overlaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If search spaces for different beams are allocated without prioritization, then resource allocation is simple, but the UE may miss the beam failure recovery response due to overlapping search spaces
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different search spaces based on their specific functions. The BFR search space is assigned the highest priority (first priority) while other search spaces have lower priorities, allowing the UE to selectively monitor based on priority levels. This resolves the contradiction by ensuring reliable BFR response reception through priority-based differentiation without requiring complete monitoring of all search spaces.
Solution Approach 2:
The patent implements preliminary action by pre-configuring priority information for different search spaces before beam failure occurs. The network assigns priority levels to search spaces in advance, and the UE uses this pre-established priority information to determine which search spaces to monitor during beam failure recovery. This eliminates the need for real-time decision-making and ensures the UE correctly identifies and monitors the BFR search space when overlaps occur.
2Reliability
If the UE monitors all search spaces during beam failure recovery, then the UE does not miss any response, but the UE wastes time and resources on overlapping search spaces that are not needed
Solution Approach 1:
The patent applies local quality by differentiating the monitoring requirements for different search spaces based on their priority levels. The UE is instructed to monitor search spaces with higher priority levels (particularly the BFR search space with first priority) while potentially skipping or de-prioritizing lower priority search spaces during beam failure recovery. This selective monitoring approach ensures reliable BFR response reception without wasting time on overlapping search spaces that are not critical for recovery.
3Ease of operation
If search spaces are allocated without priority assignment, then the allocation process is simple, but the UE cannot correctly identify which search space to monitor during overlaps
Solution Approach 1:
The patent applies local quality by assigning distinct priority identifiers to different search spaces, enabling the UE to easily differentiate and identify the correct search space during overlaps. The BFR search space receives a first priority level while other search spaces receive lower priority levels, creating clear visual and operational distinction. This priority assignment mechanism greatly simplifies UE operation by providing an intuitive priority-based identification system without requiring complex search space analysis.
4Reliability
If the network does not prioritize BFR search space, then resource allocation remains simple, but beam failure recovery is delayed or failed
Solution Approach 1:
The patent applies local quality by implementing priority-based differentiation in search space allocation, where the BFR search space is assigned the highest priority level. This ensures that during beam failure recovery, the network and UE correctly identify and process the BFR search space first, preventing recovery delays or failures. The priority configuration adds minimal complexity while dramatically improving recovery reliability.
Solution Approach 2:
The patent implements preliminary action by pre-configuring priority information for search spaces before beam failure occurs. The network assigns priority levels in advance, establishing a clear hierarchy that guides UE behavior during beam failure recovery. This pre-established priority framework ensures timely and successful recovery without requiring complex real-time decisions, balancing implementation complexity with recovery reliability.
Data Source
AI summary
Search space-BFR time occasions may overlap with other search space occasions. Additionally, if any CORESET other than a CORESET-BFR has lowest CORESET ID, the UE will prioritize receiving that CORESET and may miss the BFR response. Accordingly, assigning a priority to CORESETs or search spaces during BFR may be preferable. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may allocate a set of time-frequency resources to a plurality of CORESETs or a plurality of search spaces. The apparatus may assign a priority to each of the plurality of CORESETs or the plurality of search spaces. The apparatus may assign a highest priority to a CORESET for BFR or a search space for BFR.