Dormant Bandwidth Part Switching for Uplink Grant Access
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Solution Overview
Problem
In wireless communication systems, the challenge of reducing UE battery consumption while maintaining the ability to transmit essential uplink data during dormant bandwidth parts is not adequately addressed, as the wireless device cannot acquire an uplink grant when all cells in a cell group are in a dormant state.
Innovation Solution
A wireless device configures a cell group with a dormant bandwidth part where no Physical Downlink Control Channel (PDCCH) is configured, and upon triggering a scheduling request, autonomously switches the active bandwidth part to another BWP with PDCCH, enabling uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dormant bandwidth part is activated for all cells in a cell group to reduce power consumption, then PDCCH monitoring power consumption is reduced, but the wireless device cannot acquire uplink grant to transmit essential uplink data
Solution Approach 1:
The cell group is divided into two types of bandwidth parts: dormant BWP (for power saving) and non-dormant BWP (for data transmission). The wireless device can switch between these segmented states based on transmission needs, allowing simultaneous optimization of power consumption and transmission capability.
Solution Approach 2:
The bandwidth part state is made dynamic rather than static. The wireless device can autonomously switch between dormant and non-dormant states based on scheduling request triggers, enabling adaptive adjustment of power consumption vs. transmission capability according to actual needs.
2Use of energy by moving object
If the wireless device does not monitor PDCCH for all cells in a cell group to save power, then power consumption is reduced, but the device cannot acquire uplink grant when scheduling request is triggered
Solution Approach 1:
The wireless device preliminarily switches to a non-dormant bandwidth part before uplink data transmission is needed (when scheduling request is triggered). This preliminary action ensures that PDCCH monitoring capability is restored exactly when needed for acquiring uplink grant, avoiding both unnecessary power consumption and transmission failures.
Solution Approach 2:
The wireless device autonomously manages its own bandwidth part state based on internal scheduling request triggers, without requiring continuous network control. This self-service mechanism allows the device to automatically switch between power-saving mode and transmission-ready mode based on its own needs.
Data Source
AI summary
A method and apparatus for autonomous changing for dormant bandwidth part in a wireless communication system is provided. A wireless device configures a cell group including a certain cell on which a PUCCH is configured. A wireless device activates a dormant BWP of the certain cell to be an active BWP of the certain cell, wherein no PDCCH is configured on the dormant BWP. A wireless device switches the active BWP of the certain cell from the dormant BWP to another BWP upon triggering the scheduling request procedure, wherein at least one PDCCH is configured on the other BWP.