BWP Deactivation Timer Management for Seamless Switching
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Solution Overview
Problem
Data transmission interruption occurs during Bandwidth Part (BWP) switching in communication systems due to the need to clear Semi-Persistent Scheduling (SPS) resources when a BWP timer times out, leading to unintended switching to a default or initial BWP.
Innovation Solution
A timer-based BWP switching method that allows terminal devices to determine whether to stop, start, or adjust the BWP deactivation timer based on indication information, such as PDCCH scrambled using CS-RNTI or RRC re-configuration messages, to manage non-dynamic scheduling resources and prevent data transmission interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the BWP deactivation timer is used to switch UE from non-default BWP to default BWP for energy saving, then energy consumption is reduced, but data transmission interruption occurs during BWP switching
Solution Approach 1:
The network device sends indication information in advance to activate or deactivate non-dynamic scheduling resources before the BWP timer expires. This preliminary action ensures that SPS resources are properly configured on the target BWP before switching occurs, preventing data transmission interruption while maintaining energy-saving benefits
Solution Approach 2:
The terminal device monitors the BWP timer status and provides feedback to the network device. When the timer is approaching expiration or switching is detected, the terminal can trigger resource activation/deactivation procedures, ensuring seamless BWP transition without interrupting ongoing data transmissions
2Manufacturing precision
If SPS resources are cleared during BWP switching to maintain resource consistency, then resource management accuracy is improved, but data transmission interruption occurs
Solution Approach 1:
Instead of clearing SPS resources after BWP switching, the network device performs preliminary activation or deactivation of SPS resources on the target BWP before the switch occurs. This ensures resource consistency is maintained while avoiding transmission interruption
Solution Approach 2:
The conventional approach clears resources after switching; this invention inverts the sequence by activating/deactivating resources before switching. This reversal maintains resource management accuracy while preventing the harmful effect of transmission interruption
3Extent of automation
If the BWP timer switches to default BWP automatically upon timeout, then BWP management automation is improved, but control precision over resource activation is reduced
Solution Approach 1:
The terminal device monitors BWP timer status and provides feedback to the network device, enabling the network to make informed decisions about resource activation timing. This feedback mechanism maintains automation while improving control precision over resource activation
Solution Approach 2:
The indication information acts as an intermediary between the automatic BWP timer mechanism and SPS resource management. It allows the network device to coordinate resource activation/deactivation with BWP switching events, bridging the gap between automated timer-based switching and precise resource control
Data Source
AI summary
Provided are a timer-based bandwidth part (BWP) switching method, a terminal device, and a network device. The method is applied to a terminal device. A BWP and a non-dynamic scheduling resource are configured for the current serving cell of the terminal device, and a BWP deactivation timer is configured for the currently activated BWP. The method includes: after receiving indication information, the terminal device determines whether to stop, start, or adjust the BWP deactivation timer, the indication information being used for indicating that the terminal device activates or deactivates the non-dynamic scheduling resource.