Secondary Cell Group Activation via Bandwidth Part Switching
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing secondary cell group activation for dual connectivity with multiple radio access technologies, particularly in transitioning between dormant and activated states, which affects power consumption and signaling efficiency.
Innovation Solution
The method involves operating a user equipment (UE) in a secondary cell group (SCG) using dormant or enhanced dormant downlink bandwidth parts, and switching to an activated state upon receiving a control message, leveraging downlink control information for quicker transitions and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE operates in SCG dormant state to conserve power, then power consumption is reduced, but activation time increases when transitioning to activated state
Solution Approach 1:
The UE performs measurements and maintains synchronization information in advance while in dormant state. The dormant downlink BWP is configured with measurement resources, allowing the UE to prepare for activation without full activation, thus reducing activation time when transitioning to activated state
Solution Approach 2:
The system dynamically switches between dormant and activated states based on traffic requirements. The dormant downlink BWP and activated downlink BWP are configured with different parameters, allowing flexible adaptation to varying network conditions and traffic demands while optimizing both power consumption and activation speed
2Speed
If the UE operates in SCG activated state for quick response, then activation time is reduced, but power consumption increases
Solution Approach 1:
The UE alternates between dormant and activated states based on periodic traffic patterns. During dormant state, the UE conserves power by minimizing radio operations. When traffic arrives, the UE quickly transitions to activated state using the pre-configured dormant downlink BWP, maintaining periodic readiness without continuous activation
3Adaptability or versatility
If multiple BWPs are configured for state transitions, then state switching flexibility is improved, but device complexity increases
Solution Approach 1:
The downlink bandwidth is segmented into multiple BWPs: dormant downlink BWP for low-power operations and activated downlink BWP for full functionality. Each BWP is configured with specific parameters suitable for its intended operation mode, allowing clear separation of functions and simplified management of state transitions
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may operate, in connection with a secondary cell group (SCG) for multiple radio access technology dual connectivity, in one of an SCG dormant state in a dormant downlink bandwidth part (BWP) configured for a primary secondary cell of the SCG or an SCG enhanced dormant state in an enhanced dormant downlink BWP configured for the primary secondary cell. The UE may receive a control message associated with activating the SCG for the UE, the control message indicating a BWP switch for the UE. The UE may switch, in connection with receiving the control message, from one of the dormant downlink BWP or the enhanced dormant downlink BWP to an activated downlink BWP in which the UE operates in an SCG activated state. Numerous other aspects are provided.