Bandwidth Part Dormant Mode for Carrier Aggregation
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Solution Overview
Problem
In next-generation mobile communication systems, there is a need for a method to prevent processing delays associated with configuring and activating carrier aggregation technology, particularly in terminals with multiple cells, which can increase battery consumption and cause data transmission or reception delays.
Innovation Solution
A dormant mode is introduced for bandwidth parts, allowing rapid activation and deactivation of carrier aggregation technology, where a terminal can selectively activate or deactivate bandwidth parts based on received messages from the base station, reducing battery consumption and minimizing delays by skipping PDCCH monitoring and channel measurements in dormant states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cells are maintained in active state for carrier aggregation, then data transmission rate is improved, but battery consumption increases
Solution Approach 1:
The patent segments the cell states into three distinct modes: active state, dormant state, and deactivated state. This segmentation allows the terminal to selectively maintain only necessary cells in active state while transitioning others to dormant or deactivated states, thereby reducing battery consumption while preserving data transmission capabilities through carrier aggregation when needed.
Solution Approach 2:
The patent introduces dynamic state transitions between active, dormant, and deactivated states for bandwidth parts. The terminal can rapidly switch between these states based on data transmission requirements, enabling flexible adaptation that balances battery consumption and data transmission rate. The dormant state serves as an intermediate dynamic state that allows faster reactivation compared to deactivated state.
2Use of energy by moving object
If multiple cells are maintained in deactivated state to reduce battery consumption, then battery life is extended, but data transmission delay increases
Solution Approach 1:
The patent applies preliminary action by maintaining bandwidth parts in dormant state rather than deactivated state. In dormant state, the terminal performs lighter monitoring activities that preserve channel state information and reduce reactivation time. This preliminary preparation ensures that when data transmission is needed, the cells can be activated faster, reducing transmission delay while still conserving battery compared to fully active state.
Solution Approach 2:
The patent applies local quality by differentiating the monitoring and maintenance levels for different bandwidth parts. Instead of uniformly deactivating all cells, the terminal selectively transitions specific bandwidth parts to dormant or deactivated states based on local traffic requirements. This allows critical bandwidth parts to remain in dormant state with faster reactivation capability while non-critical parts are deactivated for maximum battery savings.
3Loss of time
If carrier aggregation is rapidly activated, then transmission delay is reduced, but processing complexity increases
Solution Approach 1:
The patent changes the operational parameters of bandwidth parts by introducing dormant state as an intermediate parameter between active and deactivated states. This parameter change allows the system to achieve rapid activation by transitioning from dormant to active state, which requires less processing than activation from deactivated state. The dormant state preserves essential parameters and configurations, reducing the processing complexity required for rapid reactivation.
Data Source
AI summary
The disclosure relates to a communication technique for combining a 5G communication system with an IoT technology to support a higher data transmission rate than a 4G system, and a system thereof. The disclosure may be applied to intelligent services (for example, services related to smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security and safety, etc.) based on a 5G communication technology and an IoT-related technology.In an embodiment of the disclosure, a method performed by a terminal in a wireless communication system is provided. The method comprises: receiving, from a base station, a radio resource control (RRC) message including information on an identifier to indicate a secondary cell (Scell), information on at least one bandwidth part (BWP) of the Scell, and information including first information on a first BWP to be used as dormant BWP among the at least one BWP and second information on a second BWP to be activated as non-dormant BWP from dormant BWP; receiving, from the base station, downlink control information (DCI) including a bitmap associated with a BWP activation of the Scell; and activating a BWP identified based on the identifier, the bitmap, and at least one of the first information or the second information.According to the disclosure, via a method by which a new dormant (or hibernation) mode may be operated in units of bandwidth parts (bandwidth part-level), a carrier aggregation technology can be rapidly activated, and a battery of a terminal can be saved.