Uplink Beam Management via P-MPR Filtering
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Solution Overview
Problem
Current uplink beam management techniques are inefficient due to the need to reduce output power for all SRS resources in a set when one or more candidate UE beams have high Power Management Maximum Power Reduction (P-MPR), leading to sub-optimal UE beam selection and poor SRS link budgets.
Innovation Solution
The user equipment (UE) evaluates the P-MPR for different candidate UE TX beams and adjusts the set of candidate beams for UL beam management to exclude those with high P-MPR, ensuring that only beams with low or zero P-MPR are used, thereby improving the SRS link budget and reducing the selection of beams that may not work due to high P-MPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits SRS resources in all candidate beams including those with high P-MPR, then complete beam coverage is achieved, but the SRS link budget deteriorates due to power reduction
Solution Approach 1:
The UE performs preliminary evaluation of P-MPR for all candidate beams before transmitting SRS resources. Based on this advance assessment, the UE identifies and excludes beams with high P-MPR values from the candidate set, ensuring that only beams with acceptable power levels are selected for SRS transmission. This preliminary filtering action prevents power budget deterioration while maintaining reliable beam selection.
2Object-affected harmful factors
If the UE reduces output power for all SRS resources when one beam has high P-MPR, then safety requirements are met, but beam management efficiency deteriorates
Solution Approach 1:
Instead of uniformly reducing power across all SRS resources, the UE applies local quality assessment by evaluating P-MPR individually for each candidate beam. The UE then applies different treatment to different beams: beams with high P-MPR are excluded from the candidate set, while beams with low or zero P-MPR are retained for normal power transmission. This localized approach maintains safety for problematic beams while preserving efficiency for safe beams.
3Adaptability or versatility
If the UE includes all candidate beams in UL beam management, then comprehensive beam evaluation is achieved, but sub-optimal beam selection occurs due to high P-MPR beams
Solution Approach 1:
The UE performs preliminary P-MPR evaluation and filtering of candidate beams before the actual beam management procedure. This preliminary action removes beams with high P-MPR values from the candidate set, ensuring that only beams with acceptable power characteristics are considered for UL beam management. The filtering maintains comprehensiveness by evaluating all initial candidates while improving selection accuracy by excluding unsuitable beams.
Solution Approach 2:
The UE uses P-MPR measurement feedback to dynamically adjust the candidate beam set. By continuously evaluating P-MPR for candidate beams and providing feedback to the beam selection process, the UE can identify and exclude beams that would lead to sub-optimal selection. This feedback mechanism ensures that beam evaluation remains comprehensive while selection accuracy is maintained through iterative refinement of the candidate set.
Data Source
AI summary
A method for assisting uplink (UL) beam management in a user equipment (UE) is provided. The method includes evaluating a measure of a reduction in maximum allowed power for a first set of candidate beams for UL beam management; determining a second set of candidate beams for UL beam management based at least in part on the evaluating the measure of a reduction in maximum allowed power for the first set of candidate beams; and performing a UL beam management procedure using the second set of candidate beams.