Power Headroom Report Triggering via Pathloss Change Thresholds
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Solution Overview
Problem
In wireless communication systems, especially in 5G networks, the existing power headroom reporting mechanisms struggle to efficiently manage power control across multiple pathloss references, leading to suboptimal resource allocation and scheduling due to frequent unnecessary reports or missed changes in channel conditions.
Innovation Solution
The method involves a User Equipment (UE) deriving multiple pathloss values from different references to calculate changes, triggering a power headroom report only when the change exceeds a threshold, thereby optimizing reporting and aligning with scheduled transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE triggers power headroom reports frequently to ensure up-to-date information for the base station, then the reliability of power control is improved, but the loss of energy increases due to unnecessary reports
Solution Approach 1:
The patent changes the triggering parameter from absolute pathloss value to pathloss change amount relative to a threshold. The UE compares the change in pathloss value against a configured threshold to determine whether to trigger a report, thereby adapting the reporting behavior to actual channel condition changes and reducing unnecessary reports when channel conditions are stable
Solution Approach 2:
The patent implements a feedback mechanism where the UE monitors pathloss changes continuously and provides feedback to the network only when significant changes occur. This selective feedback approach ensures the base station receives updated information when needed while avoiding energy waste from constant reporting
2Productivity
If the UE triggers power headroom reports for every pathloss change to maintain accurate resource allocation, then the productivity of resource allocation is improved, but the loss of time increases due to processing overhead
Solution Approach 1:
The patent modifies the triggering condition by introducing a threshold-based comparison of pathloss change amounts. Instead of reporting every change, the UE only triggers reports when the change exceeds the threshold, reducing processing overhead while maintaining resource allocation accuracy for significant channel variations
Solution Approach 2:
The patent applies partial action by triggering reports only for significant pathloss changes rather than all changes. This selective approach processes only the necessary subset of events that truly impact resource allocation, reducing unnecessary processing time while maintaining allocation efficiency
3Adaptability or versatility
If the UE uses multiple pathloss references for different PUSCH transmissions, then the adaptability of power control is improved, but the device complexity increases due to multiple pathloss derivations
Solution Approach 1:
The patent segments the pathloss management by associating different pathloss references with different PUSCH transmissions. Each PUSCH transmission can use its own pathloss reference, allowing independent optimization for different transmission scenarios while keeping the overall system manageable through clear separation of references
4Measurement precision
If the UE derives pathloss values from multiple references to detect significant changes, then the measurement precision of channel conditions is improved, but the ease of operation decreases due to complex triggering conditions
Solution Approach 1:
The patent transforms the measurement approach by focusing on the change amount of pathloss rather than absolute values. The UE derives pathloss from multiple references but only triggers reports when the change exceeds a threshold, maintaining precise channel condition detection while simplifying the operation through a clear threshold-based decision rule
Data Source
AI summary
A method and apparatus are disclosed from the perspective of an User Equipment (UE). In one embodiment, the method includes the UE deriving a first pathloss value from a first pathloss reference of a serving cell, wherein the first pathloss value is used for deriving a power headroom value included in a first power headroom report. The method also includes the UE deriving a second pathloss value from a second pathloss reference of the serving cell after deriving the first pathloss value, wherein the second pathloss reference is used for power control for a first Physical Uplink Shared Channel (PUSCH) transmission on the serving cell. The method further includes the UE deriving the pathloss change based on the first pathloss value and the second pathloss value. In addition, the method includes the UE determining whether a second power headroom report is triggered based on whether the pathloss change is more than a threshold.