Component Carrier Power Headroom Reporting for Multi-Carrier Wireless
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Solution Overview
Problem
In multi-carrier wireless communication systems, efficient power headroom reporting is challenging, especially with carrier aggregation, where independent power control for each carrier is needed to manage different quality of service requirements and interference levels, and existing methods do not effectively handle scenarios with multiple schedulers and asymmetric carrier configurations.
Innovation Solution
The implementation of component carrier-specific power headroom reports (PHRs) that include power headroom information for all or a subset of aggregated carriers, allowing for efficient transmission of UE Power Headroom Reports (PHRs) using both type 1 and type 2 PHRs, which account for uplink shared and control channels, and the use of virtual uplink control channels to determine carrier suitability for primary carrier changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If component carrier-specific power control is implemented for each aggregated carrier, then power control efficiency and QoS management are improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent divides the power control mechanism into component carrier-specific segments, where each aggregated carrier has its own power control parameters (P0, α, PL, δPUSCH). This segmentation allows independent optimization of power control for each carrier based on its specific QoS requirements and interference conditions, resolving the contradiction by enabling precise control while managing complexity through structured parameter organization.
Solution Approach 2:
The patent applies local quality by allowing different power control parameters and strategies for different component carriers within the same aggregated set. Each carrier can have customized P0 values, path loss compensation factors (α), and closed-loop corrections (δPUSCH) tailored to its specific channel conditions, QoS requirements, and interference levels, thereby achieving high power control efficiency without requiring complete reconfiguration of the entire system.
2Measurement precision
If power headroom reports are transmitted for all aggregated carriers, then accurate power information is provided for scheduling decisions, but uplink overhead increases
Solution Approach 1:
The patent extracts and reports only the essential power headroom information needed for effective scheduling decisions. Rather than transmitting complete power control parameter sets for all carriers, the system selectively reports power headroom values (PHR) that capture the critical power status information, thereby maintaining measurement precision while reducing uplink overhead through targeted information extraction.
Solution Approach 2:
The patent implements partial reporting of power headroom information across aggregated carriers. Instead of reporting full power control details for every carrier in all conditions, the system reports power headroom for carriers where it is most critical or changes significantly, using triggers and thresholds to determine which carriers require reporting. This partial action approach maintains necessary accuracy while minimizing unnecessary overhead.
3Adaptability or versatility
If independent TPC is configured for different aggregated carriers, then QoS requirements and interference levels are better managed, but configuration complexity and signaling requirements increase
Solution Approach 1:
The patent applies local quality by configuring independent Transmit Power Control (TPC) parameters for different aggregated carriers based on their specific QoS requirements and interference conditions. Each carrier can have customized open-loop parameters (P0, α, PL) and closed-loop correction mechanisms (δPUSCH), allowing the system to adapt to diverse service requirements (eMBB, URLLC, mMTC) and channel conditions without requiring a completely different configuration framework for each carrier.
Solution Approach 2:
The patent employs a universal power control framework that can accommodate multiple carriers with different requirements through a common signaling structure. The same TPC mechanism and parameter set can be applied across different aggregated carriers, providing multi-functionality that simplifies configuration management while still allowing carrier-specific customization through parameter values, thereby resolving the contradiction between adaptability and configuration complexity.
Data Source
AI summary
A method in a wireless communication terminal supports aggregated carrier access. The terminal is configured to transmit a power headroom report of a first type, determine that a condition for transmission of a power headroom report of a second type is satisfied, and transmits a power headroom report of the second type. In other embodiments, essential power headroom reports are prioritized over non-essential power headroom reports.