Power Headroom Reporting Policy for Multi-Carrier Uplink Scheduling
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Solution Overview
Problem
Inaccurate power headroom reporting in communications systems due to the lack of clear determination of parameters such as carrier used for power headroom calculation and power headroom reporting type, affecting network side scheduling decisions.
Innovation Solution
Implementing a power headroom reporting method that determines the carrier used for power headroom calculation based on carrier priority and the target PHR type, using a PHR policy that specifies the first carrier with the highest priority among multiple carriers and the PHR type based on uplink transmission moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power headroom reporting is performed without clear determination of carrier and PHR type parameters, then the reporting process is simple, but the accuracy of power headroom reporting deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically determining PHR parameters (carrier index and PHR type) based on uplink transmission conditions. When uplink transmission occurs, the carrier with highest priority is selected and real PHR type is used; when no transmission occurs, virtual PHR type is used with appropriate carrier selection. This resolves the contradiction by establishing clear parameter determination rules that improve reporting accuracy without excessive complexity.
Solution Approach 2:
The terminal device autonomously determines the PHR parameters based on pre-configured carrier priority relationships and current uplink transmission status. The device self-selects the appropriate carrier and PHR type without requiring complex network-side coordination, thereby improving reporting accuracy while maintaining operational simplicity through self-service mechanisms.
2Adaptability or versatility
If multiple carriers are supported for uplink transmission, then the system capacity and flexibility are improved, but the difficulty of determining PHR parameters increases
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different carriers based on their specific characteristics and usage scenarios. Each carrier is evaluated locally according to its priority relationship, and the terminal selects the carrier with the highest priority for PHR reporting. This resolves the contradiction by providing clear local decision rules that simplify parameter determination while supporting multiple carriers with different qualities.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the selected carrier index and PHR type parameters based on the current uplink transmission state across multiple carriers. The terminal monitors uplink transmission status on each carrier and changes the PHR parameters accordingly, selecting the highest priority carrier that has uplink transmission. This approach maintains adaptability to multi-carrier scenarios while providing deterministic parameter selection rules.
Data Source
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AI summary
The present disclosure provides a power headroom reporting method and a terminal device. The method includes: performing power headroom reporting according to a power headroom report PHR policy, where the PHR policy is related to at least one of the following: a carrier used for power headroom calculation, or a target PHR type, the target PHR type includes a first PHR type and/or a second PHR type, the first PHR type includes a type 1 PHR, a type 2 PHR, or a type 3 PHR, and the second PHR type includes a real PHR or a virtual PHR.