Per-Carrier Power Headroom Reporting for Carrier Aggregation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional uplink transmission power determination algorithms are inadequate for mobile communication systems supporting carrier aggregation, as they are designed for single carrier scenarios, making it difficult to efficiently manage power headroom reporting for user equipment (UE) operating with multiple carriers.
Innovation Solution
A method and apparatus for a UE to report power headroom (PH) information per carrier in a mobile communication system supporting carrier aggregation, where PH is calculated and reported efficiently by considering the maximum transmission power per carrier, path loss, and transmission resources, allowing for efficient uplink transmission power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional uplink transmission power determination algorithm is used, then single carrier operation is supported, but carrier aggregation operation cannot be efficiently managed
Solution Approach 1:
The patent segments the power headroom reporting by introducing per-carrier power headroom reports (PHR) in addition to per-UE PHR. Each carrier's power status is independently calculated and reported, allowing the base station to manage power allocation for each carrier separately while maintaining overall power control. This segmentation enables carrier aggregation support without requiring complete redesign of the power determination algorithm.
2Measurement precision
If per-carrier power headroom reporting is implemented, then power control accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent merges per-UE power headroom reporting with per-carrier power headroom reporting into a unified reporting mechanism. The per-carrier PHR is transmitted along with the per-UE PHR using the same uplink resources and signaling structures. This combining approach provides detailed per-carrier power information without requiring separate dedicated signaling channels, thus improving power control accuracy while limiting the increase in signaling overhead.
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
A method and apparatus for determining a maximum transmission power per carrier in a mobile communication system supporting carrier aggregation are provided. The method for determining the maximum transmission power of a terminal in a mobile communication system supporting carrier aggregation includes checking whether a data channel transmission occurs on each of a plurality of carriers of which Power Headrooms (PHs) are reported in an extended PH Report (PHR), and determining the maximum transmission power of each carrier of the plurality of carriers in consideration of whether the data channel transmission occurs on a carrier corresponding to the data channel transmission.