Beam Sweep Report Uplink Power Indication
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Solution Overview
Problem
Current 5G new radio (NR) beam reporting is cumbersome and inflexible for uplink beam selection, particularly for UEs equipped with multiple panels, as it does not effectively account for available maximum uplink output power, leading to sub-optimal beam pair link selections and potential performance issues.
Innovation Solution
Incorporating information about available maximum uplink output power in beam sweep reports, allowing network nodes to select suitable beam pair links for uplink communications, and using metrics like relative maximum uplink link budget to optimize beam selection based on uplink performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam sweep reporting is performed without uplink power information, then the reporting process is simpler, but beam selection becomes sub-optimal for uplink communications
Solution Approach 1:
The beam reporting process is segmented into downlink beam evaluation (using SSB or CSI-RS) and uplink power assessment (using P-MPR values). The UE separately determines downlink channel quality and uplink power availability, then combines these in the beam sweep report to enable reliable uplink beam selection without overwhelming complexity.
Solution Approach 2:
The UE performs preliminary measurements of downlink reference signals and determines P-MPR values for different UE panels before generating the beam sweep report. This preliminary action allows the network to receive pre-processed beam quality and power information, improving uplink beam selection reliability without increasing real-time reporting complexity.
2Reliability
If multiple UE panels are used for beamforming, then coverage and reliability improve, but determining optimal uplink beam becomes more difficult
Solution Approach 1:
The patent applies local quality by associating specific P-MPR values with specific UE panels and their corresponding beamforming capabilities. Each UE panel's power characteristics are evaluated locally and reported separately, allowing the network to select the optimal uplink beam based on both downlink quality and local uplink power availability for each panel.
Solution Approach 2:
The beam sweep report acts as an intermediary that carries both downlink beam quality metrics and uplink P-MPR information from the UE to the network. This intermediary structure consolidates multiple measurements and power assessments into a single report, making it easier for the network to determine the optimal uplink beam without directly measuring each parameter separately.
3Productivity
If beam selection is based only on downlink quality, then the selection process is faster, but uplink performance may be compromised
Solution Approach 1:
The UE performs preliminary determination of P-MPR values for different UE panels before beam selection. This preliminary action allows the network to receive both downlink quality and uplink power information in advance, enabling fast beam selection based on comprehensive criteria rather than sequential evaluation, thus maintaining speed while improving uplink performance reliability.
Solution Approach 2:
The beam sweep report provides feedback to the network about both downlink beam quality and uplink power availability for different UE panels. This feedback mechanism enables the network to make informed beam selection decisions that optimize uplink performance without requiring multiple rounds of measurement and adjustment, maintaining selection speed while ensuring reliability.
Data Source
AI summary
According to some embodiments, a method performed by a wireless device for indicating an uplink performance metric in a beam sweep report comprises determining a downlink channel quality associated with each beam of a plurality of downlink beams, determining uplink performance metric associated with each beam of the plurality of downlink beams, selecting a subset of the plurality of downlink beams for reporting in abeam sweep report; and transmitting a beam sweep report to a network node based on the selected subset of downlink beams. The beam sweep report includes the uplink performance metric associated with each downlink beam in the subset of downlink beams.