UE Uplink Power Reporting for Accurate Link Adaptation
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Solution Overview
Problem
The discrepancy between reported Power Headroom Reports (PHR) and actual Power Headroom (PH) in wireless communication systems leads to inefficiencies in scheduling and link adaptation due to delays, time-varying maximum permissible exposure conditions, and variations in serving beams, resulting in mis-calibration and potential loss of transmission.
Innovation Solution
Techniques for reporting actual transmission power by determining and reporting the actual power to be used by a UE, allowing the base station to adjust link quality estimation accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports power headroom based on configured maximum transmit power, then the base station can allocate radio resources, but the reported power headroom does not reflect the true actual power headroom due to delays and time-varying conditions
Solution Approach 1:
The UE determines the actual transmission power in advance based on time-varying conditions (MPE constraints, serving beam variations) before generating the PHR. This preliminary determination ensures the PHR reflects current actual conditions rather than configured maximum power, resolving the accuracy-time delay contradiction by preparing accurate power information before transmission occurs
Solution Approach 2:
The UE reports the determined actual transmission power back to the base station through the PHR mechanism. This feedback loop enables the base station to receive real-time accurate power information, which then feeds into improved scheduling and link adaptation decisions, creating a closed-loop system that continuously optimizes resource allocation based on actual conditions
2Measurement precision
If the UE uses time-varying MPE conditions and serving beam variations to determine actual transmission power, then the power headroom reflects true current conditions, but the system complexity increases
Solution Approach 1:
The UE dynamically adjusts the transmission power parameter based on changing MPE conditions and serving beam characteristics. By monitoring these parameter changes and incorporating them into the power determination process, the system achieves accurate real-time power headroom reporting while managing complexity through structured parameter evaluation
3Productivity
If the base station schedules UE transmissions based on reported power headroom, then resource allocation can be optimized, but mis-calibration occurs due to discrepancies between reported and actual power headroom
Solution Approach 1:
The UE provides feedback about actual transmission power conditions through the PHR, enabling the base station to adjust scheduling decisions based on real-time accurate information. This feedback mechanism ensures both efficient resource allocation and reliable link adaptation by continuously aligning scheduling parameters with actual power headroom conditions
Solution Approach 2:
The scheduling system transitions from static power headroom allocation to dynamic power-based scheduling that adapts to real-time conditions. The base station uses the actual transmission power information to dynamically adjust resource allocation and link adaptation parameters, ensuring both efficiency and reliability under varying network conditions
Data Source
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AI summary
Method and apparatus are provided for reporting and receiving actual UL transmission power. In accordance with some implementation, a UE may send a first indication of power headroom to a base station. The UE may receive one or more resources allocation for a UL transmission. The UE then may determine actual transmission power to be used in the UL transmission. Upon determination, the UE may transmit the UL transmission and send an indication of the actual transmission power to the base station. The base station, in response to receiving an indication of actual transmission power of the first UL transmission, may adjust an estimate of the link quality based on the receive indication of actual transmission power.