BWP Switching for 5G UE Dormant State Power Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, there is a need for efficient bandwidth part (BWP) switching and management to optimize performance and power consumption when a secondary cell enters or leaves a dormant state, as existing methods lack efficient mechanisms for BWP selection and timer management during state transitions.
Innovation Solution
A method for a user equipment (UE) to switch between configured BWPs based on signaling, stopping or starting timers, and performing CSI measurements only when necessary, with the ability to determine whether to switch to a dormant or non-dormant BWP, and to select a pre-configured BWP for power optimization during dormant state operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UE switches to a dormant BWP when the secondary cell enters a dormant state, then power consumption is reduced, but the activation delay increases when switching back to active state
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple BWPs (including dormant and active BWPs) before the cell enters dormant state. The UE is pre-configured with a dormant BWP that it can quickly switch to when needed, and pre-configured with active BWPs that enable rapid switch-back when the cell becomes active again, thus reducing the activation delay while maintaining power savings.
Solution Approach 2:
The patent implements dynamics by enabling the UE to dynamically switch between different BWPs based on the operational state of the secondary cell. The UE can flexibly transition between dormant BWP (for power saving) and active BWP (for rapid activation), optimizing the balance between power consumption and activation delay according to real-time network conditions.
2Measurement precision
If the UE monitors all configured BWPs continuously, then BWP selection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by having the UE monitor only the necessary BWPs rather than all configured BWPs continuously. The UE monitors the active BWP for accurate channel state information and the dormant BWP for power saving, without continuously monitoring all other BWPs, thus reducing power consumption while maintaining sufficient BWP selection accuracy for the current operational state.
Solution Approach 2:
The patent implements local quality by applying different monitoring strategies to different BWPs based on their specific roles. The active BWP receives continuous monitoring for accurate channel state information, while the dormant BWP is monitored only when needed for state transition, optimizing the balance between measurement precision and power consumption for each BWP according to its local requirements.
3Productivity
If the UE switches to a non-dormant BWP upon secondary cell entering dormant state, then system performance is maintained, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the BWP configuration parameters to include both dormant and active BWPs with different characteristics. The dormant BWP is configured with parameters optimized for power saving (e.g., reduced bandwidth, reduced monitoring), while the active BWP maintains parameters for optimal system performance. The UE can switch between these parameter sets based on whether the secondary cell is in dormant or active state, thus optimizing the trade-off between system performance and power consumption.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for bandwidth part (BWP) operating of a serving cell, adapted to a user equipment (UE) in a first BWP, is provided. The method includes: receiving a signaling; and determining whether to switch to a second BWP from the first BWP according to the signaling.