Secondary Cell Dormant State Control for Carrier Aggregation Latency
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Solution Overview
Problem
Current carrier aggregation technologies experience significant delays in transitioning a secondary cell from a dormant state to an activation state, leading to inefficiencies in data transmission and user satisfaction in next-generation mobile communication systems.
Innovation Solution
A method and apparatus for controlling secondary cell states by introducing a dormant state, allowing for rapid state transitions through specific operations and procedures, including receiving state indication information via RRC messages or MAC control elements, and adjusting CQI report periods to optimize channel state reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secondary cell transitions from deactivation state to activation state using traditional carrier aggregation procedures, then the cell becomes operational for data transmission, but the process causes significant time delay and complexity
Solution Approach 1:
The patent applies preliminary action by introducing a dormant state that prepares the secondary cell in advance for full activation. Instead of directly transitioning from deactivation to activation, the cell first enters a dormant state where some functions are pre-configured, enabling faster subsequent activation and reducing overall state transition delay.
Solution Approach 2:
The patent segments the state transition process by dividing it into distinct phases: deactivation state, dormant state, and activation state. This segmentation allows the system to optimize each phase independently, with the dormant state serving as an intermediate buffer that reduces the complexity and time of the overall transition process.
2Productivity
If complex procedures are performed for carrier aggregation and secondary cell activation, then data transmission capability is achieved, but the procedure complexity increases and causes time delay
Solution Approach 1:
The dormant state performs preliminary actions by pre-configuring certain cell functions and parameters before full activation is required. This advance preparation reduces the complexity of the activation procedure and enables faster data transmission when needed.
Solution Approach 2:
The patent introduces dynamic state transitions with three distinct cell states (deactivated, dormant, activated) that can be flexibly switched based on network conditions and data transmission requirements. This dynamic approach allows the system to optimize between complexity and productivity by selecting appropriate states.
Data Source
AI summary
Provided is a method and an apparatus for for changing or controlling a state of a secondary cell in carrier aggregation. The method includes receiving secondary cell (SCell) state indication information indicating a state for a SCell from a base station through an RRC message or an MAC control element, causing a state of the SCell to transition into a dormant state when the SCell state indication information indicates the dormant state, and transmitting channel state information reporting for the SCell in the dormant state according to an dormant state CQI report period parameter set separately from an activation state CQI report period parameter.