Power Headroom Reporting for Uplink Beam Pairs
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a need to effectively control uplink transmit power to reduce battery consumption and mitigate interference, while also supporting flexible bandwidth and channel structures, which existing methods struggle to address efficiently.
Innovation Solution
The method involves reporting a power headroom (PHR) by determining a power headroom report based on the difference between the maximum transmit power and the estimated power required for uplink transmission, using a reference beam pair and path loss estimation, and adjusting transmit power for multiple uplink beam pairs to optimize power usage and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink transmit power is increased to support flexible bandwidth and channel structure, then system performance and reliability are improved, but battery consumption increases and interference is exacerbated
Solution Approach 1:
The patent dynamically adjusts transmit power parameters based on power headroom reports and channel conditions. The base station receives PHR information from the terminal and modifies uplink transmit power parameters accordingly, enabling adaptive power control that optimizes system performance while minimizing energy consumption.
Solution Approach 2:
The patent implements a feedback mechanism where terminals periodically report power headroom information to the base station. This feedback loop enables the base station to make informed decisions about power allocation, adjusting transmit power based on actual channel conditions and terminal power status, thereby resolving the contradiction between performance and energy consumption.
2Reliability
If uplink transmit power is increased to maintain communication quality, then reliability is improved, but interference caused by uplink transmission increases
Solution Approach 1:
The patent dynamically adjusts uplink transmit power parameters based on real-time power headroom reports and channel conditions. By modifying power parameters adaptively rather than using fixed high power, the system maintains communication quality while reducing unnecessary interference to other users.
Solution Approach 2:
The patent applies different power control strategies to different terminals and channels based on their specific conditions. Each terminal's transmit power is optimized individually according to its power headroom status and channel quality, preventing excessive interference while maintaining local communication reliability.
3Measurement precision
If power headroom reporting is implemented for multiple beam pairs, then power control precision is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent segments power headroom reporting by beam pair, allowing separate PHR information to be reported for each beam pair. This segmentation enables precise power control for each beam while organizing the complexity into manageable units, with the base station processing each beam's power information independently.
Solution Approach 2:
The patent implements dynamic power headroom reporting where the terminal adjusts which beam pairs to report based on current transmission conditions. Only beam pairs actively used for transmission are included in PHR reports, reducing reporting complexity while maintaining precision for relevant beams through adaptive selection.
Data Source
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AI summary
Provided are a method for reporting a power headroom and an apparatus using the same. The apparatus computes and reports a power headroom for a physical uplink shared channel (PUSCH) that is transmitted in a first transmission period of a first band having a first subcarrier interval. The power headroom is computed on the basis of at least one second transmission interval of a second band having a second subcarrier interval which overlaps with the first transmission interval.