PHR Triggering via Pathloss Thresholds in Carrier Aggregation
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Solution Overview
Problem
In LTE-A carrier aggregation systems, the existing technologies do not effectively address how user equipment (UE) triggers Power Headroom Reporting (PHR) when multiple pathloss changes occur across multiple component carriers, leading to incomplete or inaccurate reporting processes.
Innovation Solution
A PHR processing method and device that trigger PHR based on pathloss changes in activated uplink carriers, utilizing timers and trigger conditions to determine when to report power headroom information to the network, ensuring accurate reporting across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE triggers PHR based on pathloss change in single carrier LTE system, then PHR reporting is simple and straightforward, but the method cannot handle multiple pathloss changes across multiple component carriers in carrier aggregation system
Solution Approach 1:
The patent segments the PHR triggering mechanism by introducing separate pathloss change thresholds for PCell (primary cell) and PSCell (primary secondary cell). Each cell type has its own threshold parameter (dl-PathlossChange for PCell, dl-PathlossChangeS for PSCell), allowing independent control and evaluation of pathloss changes on different cell types, thus resolving the contradiction between adaptability and complexity.
2Loss of information
If UE reports PHR for all activated UL carriers, then reporting completeness is improved, but reporting overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by differentiating the triggering conditions for different uplink carriers based on their association with PCell or PSCell. PHR for PCell-triggered carriers uses one set of evaluation criteria while PHR for PSCell-triggered carriers uses another set, allowing targeted and efficient reporting that maintains completeness while reducing unnecessary processing overhead.
3Measurement precision
If separate thresholds are configured for PCell and PSCell pathloss changes, then triggering accuracy is improved, but configuration complexity increases
Solution Approach 1:
The patent introduces dynamic triggering evaluation where the system adaptively determines whether to trigger PHR based on the current cell type (PCell or PSCell) and applies the corresponding threshold. This dynamic approach allows precise threshold application without requiring static complex configuration, as the system automatically selects the appropriate threshold based on current operational state.
Data Source
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AI summary
The present invention discloses a PHR processing method and device in carrier aggregation system, and the method comprises the following steps: user equipment (UE) acquires pathloss change corresponding to uplink carrier in activation state at present; said user equipment judges whether PHR is triggered according to said pathloss change; if it is triggered, said user equipment shall acquire the power headroom (PH) information to be reported and report said PH information. In embodiments of the present invention, UE can trigger PHR according to pathloss change on uplink carrier in activation state at present in carrier aggregation system.