Power Headroom Reporting Timing via Configured Grant PUSCH
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Solution Overview
Problem
In wireless communication systems, the existing power headroom reporting (PHR) procedures face challenges in accurately determining whether to report power headroom based on actual transmission or a reference format, especially when using configured grant (CG)-based physical uplink shared channels (PUSCH), leading to ambiguity in timing and subcarrier spacing, which affects efficient signal transmission and reception.
Innovation Solution
The method involves triggering a power headroom report at a specific time point, determining power headroom information based on the uplink scheduling state, and transmitting this information on a configured grant-based PUSCH at a subsequent time point, with the time interval between these points determined by the PUSCH processing time, which is maximized based on the subcarrier spacing and timing capabilities, and clarifying the subcarrier spacing determination methods to avoid format mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power headroom report is triggered at a first time point and transmitted at a second time point, then the reporting mechanism can be implemented, but ambiguity in timing and subcarrier spacing determination arises
Solution Approach 1:
The patent applies preliminary action by determining the time interval between the first time point (PHR trigger) and the second time point (PHR transmission) based on the PUSCH processing time. This processing time is calculated in advance using the formula A×2^-u, where u is determined by the subcarrier spacing. By pre-determining this time interval, the patent eliminates timing ambiguity and ensures reliable power headroom reporting without adding operational complexity.
Solution Approach 2:
The patent applies parameter changes by dynamically determining the subcarrier spacing parameter u based on the actual PUSCH configuration. The value of u (which can be 0, 1, 2, 3, or 4 corresponding to different subcarrier spacings) is selected according to the scheduling cell's subcarrier spacing and the PUSCH processing capability. This parameter adaptation resolves the subcarrier spacing determination ambiguity while maintaining reporting accuracy.
2Productivity
If the time interval is determined based on PUSCH processing time with maximized value, then transmission efficiency is improved, but the calculation complexity increases
Solution Approach 1:
The patent applies parameter changes by using a standardized formula A×2^-u to calculate the PUSCH processing time, where A is a base value and u is the subcarrier spacing parameter. This mathematical relationship simplifies the calculation compared to empirical optimization, while still achieving maximized transmission efficiency by selecting the appropriate u value based on the subcarrier spacing configuration.
Solution Approach 2:
The patent applies feedback by using the actual PUSCH processing capability and subcarrier spacing configuration to determine the time interval. The system receives feedback about the processing time requirement and adjusts the PHR transmission timing accordingly, ensuring optimal efficiency without requiring complex external optimization algorithms.
3Adaptability or versatility
If power headroom information is determined based on actual transmission or reference format, then reporting flexibility is improved, but determination ambiguity increases
Solution Approach 1:
The patent applies preliminary action by pre-determining whether to use actual transmission or reference format based on the PHR trigger condition and PUSCH scheduling state. The system decides in advance which format to use before the PHR transmission occurs, eliminating determination ambiguity at the moment of reporting while maintaining the flexibility to choose the appropriate format based on the scheduling scenario.
Data Source
AI summary
The present invention relates to a wireless communication system and, more particularly, to a method and an apparatus therefor, the method comprising the steps of: triggering PHR at a first time point; determining PH information of a cell on the basis of actual transmission or a reference format, on the basis of an UL scheduling status; and transmitting the PH information of the cell at a second time point, via a CG-based PUSCH, wherein the UL scheduling status comprises DCI reception from the first time point to a third time point which exists before the second time point, and a time interval between the third time point and the second time point is determined on the basis of a PUSCH processing time.