Power Headroom Reporting for MR-DC Cell Group Activation
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Solution Overview
Problem
In multi-radio dual connectivity (MR-DC) systems, the network struggles to perform uplink scheduling due to unclear triggering of power headroom reports (PHR) during selective activation of cell groups, leading to potential failures and increased signaling overhead.
Innovation Solution
A method and apparatus for reporting power headroom information, where user equipment (UE) determines, based on configuration information, whether to perform power headroom reports (PHR) for candidate cell groups, and network devices transmit configuration information to instruct UE on when to perform PHR, enabling efficient scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network configures the UE with selective activation of cell groups through configuration information, then the signaling overhead and interruption time of CG change are reduced, but it becomes unclear how to trigger reporting of the PHR for cell groups, leading to failure of uplink scheduling
Solution Approach 1:
The patent changes the triggering parameters of PHR reporting by introducing new trigger conditions specifically for selectively activated cell groups. When a cell group is selectively activated or deactivated, this state change serves as a trigger for PHR reporting, ensuring the network receives power headroom information without requiring continuous reporting, thus maintaining reliable uplink scheduling while reducing signaling overhead.
2Loss of time
If the UE applies configuration information of RRC reconfiguration to selectively activate or deactivate the cell group, then the delay of selective activation of the cell groups is reduced, but the network cannot perform uplink scheduling according to the PHR due to unclear triggering conditions
Solution Approach 1:
The patent establishes preliminary triggering conditions for PHR reporting that are activated in advance when cell groups are selectively activated or deactivated. The UE is configured to automatically trigger PHR reporting when these specific events occur, ensuring the network receives timely power headroom information without requiring additional signaling or manual configuration, thus preventing information loss while maintaining fast activation.
3Loss of substance
If the UE performs configuration of selective activation of cell groups, then the signaling overhead is reduced, but it is not clear how to trigger reporting of the PHR for cell groups
Solution Approach 1:
The patent enables the UE to self-determine when to trigger PHR reporting based on predefined conditions related to cell group activation state changes. The UE autonomously monitors its own cell group activation status and triggers PHR reporting when appropriate, without requiring additional network commands or complex signaling, thus reducing signaling overhead while maintaining ease of operation through automatic self-service triggering.
Data Source
AI summary
A method for reporting power headroom information is performed by a user equipment and includes: receiving configuration information transmitted by a network device, wherein the configuration information comprises information for configuring a candidate cell group; and determining, based on the configuration information, whether to perform power headroom report.