Dormant BWP Power Saving via Inactivity Timer Suspension
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Solution Overview
Problem
In next-generation wireless communication systems, there is a need for advanced power saving mechanisms to prevent unintended transitions from dormant bandwidth parts (BWP) to default BWP, especially in scenarios where power efficiency is crucial, such as in massive machine-type communication and ultra-reliable low-latency communications.
Innovation Solution
Implementing a method where the BWP inactivity timer is not used when the user equipment (UE) is in a dormant state, allowing the UE to maintain power savings without forcibly transitioning to a default BWP, and allowing continued CSI measurement on the dormant BWP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the BWP inactivity timer is used to manage BWP transitions, then the system can automatically transition from dormant BWP to default BWP, but this causes unintended transitions that increase power consumption and reduce battery life
Solution Approach 1:
The patent extracts the BWP inactivity timer mechanism from the dormant BWP operation context. Specifically, when the UE is in dormant BWP, the network configures the UE to not use the BWP inactivity timer, thereby removing the source of unintended transitions and associated power consumption while maintaining automatic transition capability when needed
Solution Approach 2:
The patent implements dynamic behavior of the BWP inactivity timer based on the BWP state. The timer is configured differently for dormant BWP versus active BWP - it is suspended or not used during dormant state to save power, and activated during active state for proper BWP management, allowing the system to adapt its operation mode according to the current state
2Speed
If the UE frequently transitions between dormant BWP and default BWP, then the system can maintain responsive communication, but this increases power consumption and reduces battery life
Solution Approach 1:
The patent implements periodic monitoring of BWP inactivity timer values rather than continuous operation. The UE monitors the timer at specific intervals and only transitions when the timer expires or is explicitly reset by the network, reducing the frequency of state changes and associated power consumption while maintaining responsiveness when actual inactivity occurs
Solution Approach 2:
The patent changes the operational parameters of the BWP inactivity timer based on the current BWP state. When in dormant BWP, the timer parameter is set to infinity or suspended, preventing transitions. When transitioning to active BWP, the timer parameter is reset to a finite value, enabling responsive transitions only when appropriate, thus balancing speed and power consumption
Data Source
AI summary
The present specification relates to a method for receiving dormant bandwidth part (BWP) configuration information, performed by a terminal in a wireless communication system, the method comprising: receiving the dormant BWP configuration information from a base station, wherein the dormant BWP configuration information is information about a downlink BWP used as the dormant BWP among at least one downlink BWP set to the terminal; receiving, from the base station, downlink control information (DCI) notifying activation of the dormant BWP; and stopping monitoring of a physical downlink control channel (PDCCH) on the dormant BWP, wherein a BWP inactivity timer is not used on the basis of the activation of the dormant BWP, and the BWP inactivity timer is a timer for a transition to a default BWP.