User Equipment SCell Reactivation Beam Selection
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Solution Overview
Problem
In 3GPP RAN4 Radio Resource Management, there is a need to reduce the time required for reactivating a deactivated Secondary Cell (SCell) in user equipment, as current methods are inefficient in transmitting accurate Channel State Information (CSI) within the specified time frame after receiving an SCell activation command.
Innovation Solution
The user equipment includes a receiving unit for measuring reference signals, a transmitting unit for reporting measurement results, and a control unit that selects a receiving beam for the reactivated SCell based on previous measurements, allowing for efficient beam management and reducing the time interval between deactivation and reactivation by applying a predetermined receiving beam if the measurement reporting time is within a specific interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional beam management procedures are used for reactivated SCell, then beam accuracy can be maintained, but activation time increases
Solution Approach 1:
The patent applies preliminary action by storing measurement results and receiving beam information before SCell deactivation occurs. When the SCell is reactivated within a predetermined time, the UE retrieves these pre-stored results and applies the previously determined receiving beam without performing new measurements, thereby significantly reducing activation time while maintaining beam accuracy.
Solution Approach 2:
The patent uses copying by reusing the previously determined receiving beam configuration for the reactivated SCell. Instead of performing complete beam management procedures again, the UE copies the beam information from the stored measurement results, which reduces the time required for SCell reactivation while maintaining communication quality.
2Reliability
If new beam measurements are performed after SCell reactivation, then communication quality can be ensured, but reactivation time increases
Solution Approach 1:
The patent performs beam measurements and determines optimal receiving beams before SCell deactivation, storing these results in advance. When reactivation occurs within the predetermined time window, the pre-performed measurements ensure communication quality without requiring time-consuming new measurements, thus resolving the contradiction between reliability and reactivation time.
Solution Approach 2:
The patent changes the time parameter by introducing a predetermined time threshold for determining whether to use stored measurement results. If the interval between deactivation and reactivation is within this threshold, the stored results are valid; otherwise, new measurements are performed. This parameter-based decision mechanism balances communication quality requirements with reactivation speed.
3Measurement precision
If the UE waits for activation command before determining receiving beam, then beam selection accuracy improves, but activation completion time increases
Solution Approach 1:
The patent performs the receiving beam determination action in advance, before receiving the SCell activation command. The UE determines and stores the optimal receiving beam based on measurement results obtained prior to deactivation. When activation occurs within the predetermined time, this pre-determined beam is applied immediately, achieving both high selection accuracy and fast activation speed.
Solution Approach 2:
The patent introduces dynamic behavior by making the beam determination timing flexible. Instead of always waiting for activation command, the system dynamically decides whether to use pre-determined beams based on the time interval since deactivation. This dynamic approach optimizes both beam selection accuracy and activation speed according to actual conditions.
Data Source
AI summary
A user equipment includes a receiving unit that receives a reference signal from a secondary cell; a transmitting unit that transmits a result of a measurement of the reference signal; and a control unit that selects, when the secondary cell is deactivated after the transmitting unit transmits the result of the measurement and the secondary cell is reactivated, and when a time interval from a timing at which the transmitting unit transmits the result of the measurement until a timing at which the secondary cell is reactivated is within a predetermined time interval, a receiving beam that is applied to the secondary cell upon transmitting the result of the measurement by the transmitting unit, as a receiving beam to be applied to the reactivated secondary cell.