Beamforming Power Headroom Reporting Accuracy
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Solution Overview
Problem
Wireless communication devices using beamforming struggle to accurately report power headroom, as they typically use one beam for transmission and another for reporting, leading to underreporting of actual transmit power capabilities, which affects scheduling and power consumption.
Innovation Solution
The solution involves decoupling the beam used for transmission from the beam used for reporting power headroom, allowing the device to select and report the power headroom based on a different beam that offers higher power capabilities, even if it consumes more power, thereby providing a more accurate reflection of the device's transmit power capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a device uses one beam for transmission and another beam for reporting power headroom, then the reporting process is simple and fast, but the reported power headroom does not accurately reflect the actual transmit power capabilities
Solution Approach 1:
The patent segments the beam selection process into two independent parts: one beam (first beam) is selected for actual transmission based on transmission requirements, while another beam (second beam) is selected specifically for power headroom reporting based on power capability assessment. This segmentation allows each beam to be optimized for its specific purpose, resolving the contradiction between reporting accuracy and system complexity.
Solution Approach 2:
The patent applies local quality by assigning different functional qualities to different beams. The first beam is optimized for transmission quality, while the second beam is optimized for power measurement quality. This localized optimization allows the system to maintain simple beam management procedures while achieving accurate power headroom reporting through the specialized second beam.
2Reliability
If a device reports power headroom based on the current transmission beam, then the reporting process is straightforward, but the reported value may be lower than the actual transmit power capability
Solution Approach 1:
The patent implements preliminary action by having the device determine its maximum transmit power capability in advance using a dedicated second beam before actual transmission occurs. This pre-assessment of power capability using the second beam ensures that the power headroom report reflects the true maximum capability rather than being constrained by the specific transmission beam configuration, thereby improving both reliability and measurement accuracy.
3Power
If a device uses beamforming with multiple beams, then the transmit power capability can be optimized for different scenarios, but the power consumption increases
Solution Approach 1:
The patent extracts the power measurement function from the transmission beam and assigns it to a dedicated second beam. This extraction allows the system to maintain multiple beams for transmission optimization while using a separate, specialized beam solely for power capability assessment. The second beam is configured specifically to enable accurate power measurement without being constrained by transmission requirements, thus achieving high transmit power capability optimization while managing power consumption through functional separation.
Data Source
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AI summary
Various aspects of the disclosure relate to reporting power headroom of an apparatus such as a user equipment (UE). For an apparatus that uses beamforming, the power headroom associated with the beam the apparatus is using for wireless communication (e.g., with a base station) may be lower than the power headroom associated with another beam that the apparatus could use for the wireless communication. The disclosure relates in some aspects to using one beam for wireless communication and using the power headroom for another beam for a power headroom report. In this way, the apparatus may always report its full transmit power capability.