Power Headroom Report Transmission in Multi-Carrier Wireless Systems
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Solution Overview
Problem
In wireless communication systems supporting multi-carriers, there is a need for an efficient method to transmit power headroom reports from user equipment to base stations, as existing technologies face challenges in accurately allocating resources due to lack of information on maximum transmission power across activated serving cells.
Innovation Solution
The method involves calculating and transmitting power headroom reports by user equipment, including maximum transmission power for each activated serving cell, using both first and second type power headroom calculations, and sending these reports periodically or upon changes in downlink path loss, via MAC messages, to enable efficient resource allocation by the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power headroom reports are transmitted in multi-carrier systems, then resource allocation accuracy is improved, but transmission complexity and overhead increase
Solution Approach 1:
The power headroom report is segmented into multiple components: per-cell power headroom values for each activated serving cell, and a maximum transmission power value. This segmentation allows the base station to receive detailed power status information without requiring a single overly complex report structure, thereby improving resource allocation accuracy while managing transmission complexity through organized data presentation.
2Productivity
If maximum transmission power information is included in power headroom reports, then resource management efficiency is improved, but message overhead increases
Solution Approach 1:
The maximum transmission power information is merged with the per-cell power headroom reports into a single MAC layer message. This combining approach allows the base station to receive both types of information together, improving resource management efficiency by having complete power status data available simultaneously, while optimizing the use of message overhead by consolidating multiple information elements into one transmission rather than sending separate messages.
Data Source
AI summary
An apparatus and method for transmitting a power headroom report in a communication system supporting multi-carriers are disclosed, by which a user equipment is enabled to transmit the power headroom report. According to the present invention, a user equipment calculates a power headroom for each of at least one activated serving cell using a maximum transmission power of the user equipment for each of at least one activated serving cell and transmits the power headroom report including the power headroom for each of the at least one activated serving cell and the maximum transmission power of the user equipment for each of the at least one activated serving cell to a base station. In this case, the power headroom includes an information on power status of the user equipment for each of the at least one activated serving cell.