Selective Power Headroom Reporting for Dual Connectivity
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Solution Overview
Problem
In dual connectivity scenarios, the conventional power headroom reporting (PHR) triggers for both cell groups result in high overhead due to the reporting of PH information for all active serving cells, leading to inefficient power allocation and scheduling decisions.
Innovation Solution
A method and apparatus for power headroom reporting that allows disabling cross cell group reporting, enabling the terminal device to create a PH report including information from only one of the cell groups, reducing overhead and improving system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If cross cell group PH reporting is enabled, then complete power headroom information for both cell groups is reported, but reporting overhead increases
Solution Approach 1:
The patent segments the PH reporting into separate reports for MCG and SCG cell groups. Instead of reporting all PH information in a single cross-cell group report, the terminal device generates separate PH reports for each cell group, allowing selective reporting based on which cell group triggers the PHR condition first.
Solution Approach 2:
The patent implements partial reporting by only including PH information for the triggering cell group in each PH report, rather than reporting all PH information for both cell groups. This partial action reduces overhead while still providing the necessary power headroom information for scheduling decisions.
2Reliability
If PH information for all active serving cells is reported, then comprehensive power allocation decisions can be made, but scheduling efficiency decreases due to high overhead
Solution Approach 1:
The patent divides the PH reporting into separate MCG and SCG reports, allowing the network to process power allocation decisions for each cell group independently based on its respective PH information, improving scheduling efficiency while maintaining allocation accuracy.
Solution Approach 2:
The patent implements timely feedback by reporting PH information as soon as the triggering condition is met for either cell group, rather than waiting to collect all PH information. This feedback mechanism enables the network to make scheduling decisions promptly based on available PH data.
3Quantity of substance
If selective PH reporting is implemented, then reporting overhead is reduced, but power management flexibility is limited
Solution Approach 1:
The patent implements dynamic selective reporting where the terminal device adaptively chooses which cell group's PH information to report based on which cell group's PHR triggering condition is met first. This dynamic approach maintains power management flexibility while reducing overhead by reporting only when necessary.
Solution Approach 2:
The patent enables the terminal device to autonomously determine when and what PH information to report based on internal PHR triggering conditions for each cell group, without requiring complex network configuration. This self-service mechanism maintains flexibility while simplifying power management.
Data Source
AI summary
Embodiments of the present disclosure relate to power headroom report in dual connectivity. A terminal device obtain a power headroom reporting indication, which indicates disabling cross cell group PH reporting, wherein PH information of activated serving cells of both the first cell group and the second cell group are reported in the cross cell group PH reporting; and create, based on the PH reporting indication, a PH report, including PH information regarding one of the first cell group and the second cell group. In this way, signaling overhead and power consumption can be reduced.