Carrier Aggregation Power Determination via Extended PHR
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Solution Overview
Problem
Conventional uplink transmission power determination algorithms are inadequate for user equipment (UE) supporting carrier aggregation in LTE systems, as they are designed for single carrier scenarios, making it difficult to accurately determine and report Power Headroom (PH) values across multiple carriers.
Innovation Solution
A method and apparatus for determining the maximum transmission power per carrier in a mobile communication system supporting carrier aggregation, which involves checking for data channel transmission on each carrier and calculating the maximum transmission power using an extended Power Headroom Report (PHR), considering whether data channel transmission occurs on each carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional uplink transmission power determination algorithms are used, then the system is simple and easy to operate, but the power determination accuracy deteriorates when carrier aggregation is supported
Solution Approach 1:
The patent divides the power determination process into separate handling for each carrier. The Power Headroom Report is extended to include power headroom information for multiple carriers individually, allowing the system to determine maximum transmission power separately for each carrier while considering data channel transmission status on each carrier, thereby achieving accurate multi-carrier power determination without requiring a completely new complex algorithm
2Loss of information
If extended Power Headroom Report is implemented for multiple carriers, then the power reporting accuracy improves, but the signaling overhead increases
Solution Approach 1:
The patent merges the power headroom reporting for multiple carriers into a single extended Power Headroom Report structure. Instead of sending separate reports for each carrier, the system combines all carrier power headroom information into one unified report, reducing the total number of signaling messages while maintaining complete power information for all carriers
3Reliability
If maximum transmission power is determined without considering data channel transmission status, then the determination process is simplified, but the uplink transmission quality deteriorates
Solution Approach 1:
The patent performs preliminary checking of data channel transmission status on each carrier before determining the maximum transmission power. By提前 (in advance) identifying which carriers have data channel transmissions, the system can pre-calculate the appropriate power allocation for each carrier, ensuring high uplink transmission quality while avoiding the need for complex real-time adjustments during power determination
Data Source
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.