Power Headroom Report Power Backoff Indication
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Solution Overview
Problem
In wireless communication systems, terminals face challenges in reporting transmission power headroom accurately, especially when power backoff occurs, leading to inefficient scheduling by base stations due to lack of real-time information on available transmission power.
Innovation Solution
The terminal can adjust its power headroom report to instantly inform the base station of power backoff situations, allowing for dynamic scheduling based on the terminal's transmission power, using specific methods such as multiple entry PHR MAC CE formats and power management indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal uses traditional power headroom reporting methods, then the base station can receive power headroom information, but the base station cannot accurately determine the terminal's available transmission power when power backoff occurs
Solution Approach 1:
The power headroom report is segmented into multiple parts: a first power headroom value representing total available power, and a second power headroom value representing available power after power backoff. This segmentation allows the base station to receive both the overall power status and the specific power backoff status separately, resolving the information loss problem while maintaining measurement accuracy.
2Productivity
If the terminal reports detailed power backoff information, then the base station can perform accurate scheduling, but the reporting complexity and overhead increase
Solution Approach 1:
The patent merges power backoff indication with the existing power headroom report structure by using a differential representation. Instead of creating a separate reporting mechanism, the power backoff information is combined with the first power headroom value through a differential value (second power headroom = first power headroom - power backoff), reducing reporting complexity while maintaining scheduling efficiency.
3Adaptability or versatility
If the terminal adjusts transmission power dynamically to handle power backoff, then the terminal can adapt to changing conditions, but the base station cannot respond timely without real-time power status information
Solution Approach 1:
The patent implements a feedback mechanism where the terminal continuously reports power headroom information including power backoff status to the base station. This feedback loop enables the base station to have real-time knowledge of the terminal's available transmission power, allowing timely scheduling decisions that adapt to changing power conditions without introducing significant delay.
Data Source
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AI summary
The disclosure relates to a communication technique for converging a 5G communication system for supporting a higher data transfer rate beyond a 4G system with an IoT technology, and a system therefor. The disclosure may be applied to intelligent services (for example, smart home, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security and safety-related services, etc.) based on a 5G communication technology and an IoT-related technology. Methods and apparatuses are provided in which a PHR configuration including a threshold and a prohibit timer are received from a base station. It is identified whether a PHR is triggered based on the PHR configuration. The PHR is transmitted to the base station in case that the PHR is triggered. The PHR includes a bit field indicating a power backoff that is applied based on power management in case that a P field is set to 1.