Power Headroom Reporting Across Direct and Relay Paths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication technologies struggle to effectively perform Power Headroom Reports (PHR) in multi-path scenarios involving direct and indirect transmission paths, particularly in U2N relay scenarios, where a terminal device accesses a network device through both direct and indirect paths.
Innovation Solution
A method and apparatus for reporting power headroom that triggers a report when there is a change in transmission path type, calculating power headroom based on different transmission paths, and includes reporting power headroom when specific conditions are met, such as obtaining uplink resources, to facilitate accurate power management in multi-path scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power headroom reporting is performed in multi-path scenarios, then uplink communication efficiency is improved, but device complexity increases due to multiple transmission paths
Solution Approach 1:
The patent segments the power headroom reporting by transmission path type, calculating and reporting power headroom separately for direct paths and indirect paths. This allows the network to understand power status for each path independently, improving uplink scheduling efficiency while managing complexity through structured segmentation of the reporting mechanism.
Solution Approach 2:
The patent implements dynamic triggering mechanisms for power headroom reporting based on path type changes, path loss variations, and scheduling request states. The reporting behavior adapts dynamically to current transmission conditions, ensuring timely power information is provided to the network without continuous reporting overhead, thus improving efficiency while controlling complexity.
2Measurement precision
If power headroom is calculated based on different transmission paths, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The patent segments power headroom calculation by transmission path type (direct path and indirect path), maintaining separate power headroom values for each path. This segmentation enables precise measurement of power status for each transmission mode while organizing calculations in a structured manner that manages complexity through clear separation of calculation domains.
Solution Approach 2:
The patent applies local quality by using path-specific parameters for power headroom calculation, such as path-type-specific maximum transmission powers and path loss values. Each path type uses its own characteristic parameters, ensuring measurement precision is optimized for each specific transmission scenario while keeping calculations localized to each path type.
3Reliability
If power headroom report is triggered on path type changes, then reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent implements dynamic triggering conditions for power headroom reporting that adapt to path type changes, path loss variations, and scheduling request states. Reporting is triggered only when necessary conditions are met, ensuring reliable power information is provided to the network while avoiding unnecessary signaling overhead through conditional and event-driven reporting mechanisms.
Solution Approach 2:
The patent establishes a feedback mechanism where the network receives power headroom reports and uses this information to adjust uplink scheduling decisions. The feedback loop ensures reliable power information transmission for scheduling optimization while the network can control reporting frequency and content based on actual scheduling needs, balancing reliability with overhead reduction.
Data Source
AI summary
The present disclosure provides a method for reporting power headroom, device, terminal device, and network device. The method, performed by a terminal device, includes: triggering a power headroom report when a transmission path type changes; wherein the transmission path type comprises direct path and/or indirect path; the direct path is a transmission path for direct communication between the terminal device and the network device, and the indirect path is a transmission path requiring relay by a relay device for communication between the terminal device and the network device.