User Equipment SCell Activation Logic for BWP-Aware PHR Triggering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
User equipment (UE) faces challenges in handling SCell activation commands when the secondary cell (SCell) is already in an activated state, particularly in determining the appropriate action for the active bandwidth part (BWP) and whether to trigger a power headroom report (PHR).
Innovation Solution
The UE determines the state of the SCell and the type of its active BWP upon receiving an activation command, triggering a PHR only if the BWP is non-dormant, and activating the BWP for first activation if the types differ, while not triggering a PHR if both BWPs are dormant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE triggers a PHR every time it receives an SCell activation command, then the network can always obtain up-to-date power headroom information, but unnecessary PHR transmissions occur when the SCell is already activated causing increased signaling overhead and energy consumption
Solution Approach 1:
The invention changes the parameter of PHR triggering behavior based on the SCell state. When the SCell is already in an activated state, the UE determines not to trigger a PHR upon receiving an activation command. This conditional parameter change eliminates unnecessary PHR transmissions while maintaining accurate power headroom reporting when actually needed, thus reducing energy consumption without sacrificing information accuracy.
2Ease of operation
If the UE always activates a pre-configured BWP when receiving an SCell activation command, then the activation process is simplified, but the BWP may not be appropriate if the SCell is already activated with a different active BWP
Solution Approach 1:
The invention makes the BWP activation behavior dynamic based on the SCell's current state. When the SCell is already activated, the UE determines the type of the active BWP and compares it with the pre-configured BWP, activating the pre-configured BWP only if they differ. This dynamic approach ensures BWP configuration appropriateness while maintaining operational simplicity through automated state-based decision-making.
3Loss of information
If the UE triggers a PHR when the active BWP is a dormant BWP, then the network receives comprehensive power headroom reports, but it causes unnecessary signaling overhead and processing burden
Solution Approach 1:
The invention applies different PHR triggering behavior to different BWP types. Specifically, when the active BWP is determined to be a dormant BWP, the UE does not trigger a PHR. This local quality differentiation ensures that power headroom reporting is maintained for active BWPs while avoiding unnecessary signaling for dormant BWPs, thus reducing processing complexity without significantly compromising reporting completeness.
Data Source
AI summary
Provided in the present invention are a method performed by user equipment, and user equipment. The method performed by user equipment is a method in which UE, after receiving a command for activating an SCell, triggers a PHR, the method including the following steps: receiving, by UE, an activation command for activating an SCell; when the UE receives the activation command, determining, by the UE, the state of the SCell; and when the UE determines that the SCell is in an activated state before the activation command is received, determining, by the UE, the type of an active BWP of the SCell; and when the UE determines that the type of the active BWP is a non-dormant BWP, triggering, by the UE, a PHR.