Power Headroom Report Format With P-MPR Indicator
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Solution Overview
Problem
In LTE communication systems, existing methods for reporting User Equipment (UE) transmission power are inadequate as they do not account for variations in maximum transmission power, leading to improper resource allocation by the base station, resulting in inefficient scheduling.
Innovation Solution
A method that includes a variation factor of maximum transmission power, specifically the Power Management-Maximum Power Reduction (P-MPR), is introduced, allowing the UE to report whether its maximum transmission power is influenced by P-MPR, enabling the base station to accurately determine and adjust resource allocation based on the UE's transmission power variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports only basic transmission power information without variation factors, then the reporting method remains simple, but the base station cannot accurately determine resource allocation due to unknown power variations
Solution Approach 1:
The transmission power information is segmented into multiple components: basic maximum transmission power (PCMAX) and variation factors (P-MPR, A-MPR, ΔTC). This segmentation allows the base station to receive comprehensive power information while keeping each component's definition clear and manageable, resolving the contradiction between accuracy and complexity.
Solution Approach 2:
The UE performs preliminary calculations and determinations of various power variation factors (P-MPR, A-MPR, ΔTC) before reporting. By preparing these factors in advance based on predetermined rules and stored tables, the UE ensures accurate power information is ready for reporting without adding complex real-time processing requirements at the base station.
2Reliability
If the UE includes multiple power variation factors in the report, then the base station can accurately allocate resources, but the amount of data to be reported increases
Solution Approach 1:
The patent extracts only the essential power variation factors (P-MPR, A-MPR, ΔTC) that most significantly impact transmission power from the complete set of possible power parameters. By selecting and reporting only these critical factors, the system achieves reliable resource allocation without unnecessarily increasing reporting data volume.
Solution Approach 2:
The power variation factors serve multiple functions: they indicate power reductions due to different causes (power management, additional power management, time constraints), enable accurate resource allocation, and provide the base station with comprehensive power state information. This multi-functionality allows a single reporting mechanism to achieve multiple objectives without proportionally increasing complexity.
3Productivity
If the base station uses traditional scheduling methods without considering power variation factors, then the scheduling process remains simple, but resource allocation becomes inefficient due to inaccurate power information
Solution Approach 1:
The UE provides feedback to the base station by reporting power variation factors (P-MPR, A-MPR, ΔTC) along with maximum transmission power. This feedback mechanism enables the base station to adjust its scheduling decisions based on accurate, real-time power information, improving resource allocation efficiency without requiring complex scheduling algorithms.
Solution Approach 2:
The base station uses the reported power variation factors to preliminarily determine appropriate resource allocation before actual transmission. By having power information ready in advance, the base station can make informed scheduling decisions without requiring complex real-time power calculations, thus improving efficiency while maintaining manageable complexity.
Data Source
Figure 1a~1b
Figure 2
Figure 3a
AI summary
A method by a base station in a wireless communication system is disclosed, comprising transmitting configuration information including a prohibit power headroom report, PHR, timer and a PHR format to a terminal. The base station receives a PHR corresponding to the PHR format from the terminal. The received PHR includes power headrooms, PHs, for multiple serving cells and an indicator indicating whether the terminal applies a power management-maximum power reduction, P-MPR, if the PHR format is associated with the PHs for multiple serving cells. The received PHR does not include the indicator if the PHR format is not associated with the PHs for the multiple serving cells. The PHR is triggered at the terminal, if the prohibit PHR timer is expired and a power backoff by the P-MPR is changed more than a threshold.