Uplink Power Control in Carrier Aggregation Overlap Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-AR11, the difference in timing advance values among carriers can lead to adjacent subframe overlaps, resulting in power limitations or interference due to excessive total transmit power, which existing methods fail to adequately mitigate.
Innovation Solution
The method involves acquiring the maximum transmit power for adjacent subframes and performing power control to ensure the total transmit power in the overlap region does not exceed the maximum allowed, using either the higher or minimum of the two maximum transmit powers to prevent power or interference limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different timing advance values are used for different carriers in LTE-AR11, then transmission timing accuracy is improved, but adjacent subframes may overlap causing total transmit power to exceed maximum power limits
Solution Approach 1:
The patent performs preliminary power control adjustments before actual transmission in overlap regions. By calculating and limiting the transmit power of carriers in advance based on maximum power constraints, the system prevents power exceeding before it occurs, resolving the contradiction between maintaining different TA values for accuracy and preventing power overflow.
2Reliability
If transmit power is increased to maintain signal quality in overlap regions, then communication reliability is improved, but power limitation and interference are triggered
Solution Approach 1:
The patent dynamically changes the transmit power parameter for carriers in overlap regions based on power control calculations. By adjusting the power parameter to ensure total power remains within limits while maintaining adequate signal quality, the system achieves reliable communication without triggering interference conditions.
3Power
If power control is performed to limit total transmit power in overlap regions, then power limitation is avoided, but transmission power flexibility is reduced
Solution Approach 1:
The patent applies power control selectively only in overlap regions where subframes from different carriers overlap, while allowing full power flexibility in non-overlap regions. This localized approach maintains power compliance where needed without unnecessarily restricting power allocation flexibility in regions where it is not required.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The present invention provides a method and an apparatus for controlling uplink power of a user equipment in a carrier aggregation scenario, where the method includes: separately acquiring first maximum transmit power of the user equipment corresponding to a first subframe and second maximum transmit power of the user equipment corresponding to a second subframe; and when the first maximum transmit power and the second maximum transmit power are different, using a minimum value of the first maximum transmit power and the second maximum transmit power as first configured maximum transmit power, and performing power control over transmit power of multiple carriers in an overlap region according to the first configured maximum transmit power, so that total transmit power of the multiple carriers in the overlap region after the power control is lower than or equal to the minimum value of the first maximum transmit power and the second maximum transmit power, where, the first subframe and the second subframe are adjacent subframes, and the overlap region is a portion in which the first subframe and the second subframe overlap due to a difference in timing advance values of the multiple carriers.