Secondary Cell Group Deactivation With TAT Hold for Low-Latency 5G
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Solution Overview
Problem
Next-generation wireless communication systems face challenges with processing delays and increased power consumption due to the activation and deactivation of carrier aggregation (CA) or dual connectivity (DC) technologies, as terminals must perform physical downlink control channel monitoring for multiple cells, leading to inefficiencies in data transmission and reception.
Innovation Solution
A method involving the detection and recovery of beam failure through a radio resource control (RRC) message that includes information for deactivating a secondary cell group (SCG) with a continuing timing alignment timer, allowing for MAC reset without interrupting the timer, thereby optimizing power consumption and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If carrier aggregation or dual connectivity technologies are configured and activated for a terminal, then data transmission rate is improved, but processing delay increases
Solution Approach 1:
The patent applies preliminary action by maintaining the configuration information of the second cell group in a pre-configured state before activation is needed. When activation is required, the terminal can quickly restore and use the pre-configured cell group without undergoing lengthy configuration procedures, thus reducing processing delay while maintaining high data transmission rates.
2Productivity
If multiple cells are activated for carrier aggregation or dual connectivity, then data transmission capability is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic cell group management by allowing the terminal to activate or deactivate the second cell group based on actual service requirements. When high data transmission capability is needed, the second cell group is activated; when service demands are low, it is deactivated to save power. This dynamic adjustment resolves the contradiction between transmission capability and power consumption.
3Reliability
If the terminal performs physical downlink control channel monitoring for multiple cells, then reception reliability is improved, but power consumption increases
Solution Approach 1:
The patent segments the cell groups into a first cell group and a second cell group, allowing independent management of monitoring activities. The terminal performs physical downlink control channel monitoring selectively based on which cell group is currently activated, rather than continuously monitoring all cells. This segmentation enables the terminal to maintain reception reliability for active cells while avoiding unnecessary power consumption from monitoring deactivated cells.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Provided is a method performed by a terminal in a wireless communication system that includes receiving a radio resource control (RRC) message including information associated with a deactivation of a secondary cell group (SCG), and resetting a medium access control (MAC) of the SCG based on the RRC message, with a timing alignment timer (TAT) associated with the SCG not being stopped for resetting the MAC of the SCG.