Beam-Specific Power Headroom Reporting for 5G PUSCH
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Solution Overview
Problem
In 5G NR wireless communications, user equipment (UE) sends power headroom reports (PHR) independently of the beam used for PUSCH transmission repetitions, leading to inaccurate reports as power control parameters differ across beams, resulting in suboptimal transmission performance.
Innovation Solution
The UE determines and transmits a power headroom report based on the power control parameters specific to each PUSCH repetition/beam, using medium access control-control elements (MAC-CEs) to provide accurate PHR information to the base station, allowing for beam-specific power control adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single power headroom report is transmitted independently of beam-specific parameters, then the reporting process is simple, but the accuracy of power headroom information deteriorates
Solution Approach 1:
The patent segments the power headroom reporting by associating it with specific power control parameter sets (PCO) and beams. Instead of a single unified PHR, the system divides the reporting into beam-specific or PCO-specific PHR instances, allowing accurate representation of power conditions for each beam while maintaining manageable complexity through structured association.
Solution Approach 2:
The patent applies local quality by making power headroom reports specific to particular beams or power control parameter sets rather than uniform across all transmissions. Each PHR is tailored to the local conditions of its associated beam, capturing beam-specific power characteristics and pathloss values for improved accuracy.
2Productivity
If beam-specific power control parameters are used for PUSCH repetitions, then transmission performance is improved, but the complexity of power control management increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple power control parameter sets (PCO) associated with different beams before PUSCH transmission. The base station provides RRC configuration that establishes these parameter sets in advance, including pathloss reference signals and power control adjustments, so that beam-specific power control is ready when needed without real-time computation complexity.
Solution Approach 2:
The patent utilizes parameter changes by allowing dynamic selection and switching between different power control parameter sets based on beam conditions. The system can adjust power control parameters (such as pathloss reference signals, power offsets, and adjustment states) for each beam or PCO, enabling adaptive transmission optimization without requiring complete reconfiguration.
Data Source
AI summary
A user equipment (UE) is configured to provide a power headroom report (PHR) to a network. The UE receives a physical uplink shared channel (PUSCH) configuration from a base station of the wireless network, wherein the PUSCH configuration includes a plurality of beams over which PUSCH repetitions should be transmitted, determines at least one power headroom report (PHR) based on a power control parameter set corresponding to at least one of the plurality of beams or PUSCH repetitions and transmits the at least one PHR to the base station.