Multiple SCG Configurations with Dormant Cell Group Activation
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Solution Overview
Problem
In next-generation mobile communication systems, carrier aggregation and dual connectivity configurations face challenges such as processing delays and increased battery consumption due to continuous PDCCH monitoring across multiple cells, leading to inefficiencies in data transmission and reception.
Innovation Solution
A method and device that enable a dormant mode for secondary cell groups, allowing terminals to quickly activate and deactivate carrier aggregation or dual connectivity by managing bandwidth parts at a cell or cell group level, reducing battery consumption and minimizing latency through controlled PDCCH monitoring and channel measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous PDCCH monitoring is performed across multiple cells in carrier aggregation and dual connectivity configurations, then data transmission reliability is improved, but battery consumption increases
Solution Approach 1:
The patent introduces dynamic cell group suspension and resumption mechanisms that allow the terminal to transition between monitoring and non-monitoring states based on data transmission needs. The base station can suspend cell group monitoring when no data is transmitted and resume it when data becomes available, making the PDCCH monitoring behavior adaptive rather than static.
Solution Approach 2:
The patent implements periodic wake-up mechanisms where the terminal periodically checks for data availability before fully activating cell group monitoring. This periodic action allows the terminal to maintain readiness for data transmission while minimizing continuous monitoring duration, thus reducing battery consumption while preserving transmission reliability.
2Productivity
If multiple cells are maintained active for carrier aggregation or dual connectivity, then data transmission rate is improved, but processing delay increases
Solution Approach 1:
The patent performs preliminary channel measurement and configuration maintenance in suspended cell groups. The terminal continues to measure downlink reference signals and maintain configuration information even when fully monitoring is suspended, so that when resumption is needed, the terminal can quickly activate data transmission without undergoing complete re-initialization, thereby reducing processing delay.
Solution Approach 2:
The patent enables dynamic resumption of cell group monitoring with fast activation capabilities. When data becomes available, the base station can quickly resume cell group monitoring and activate data transmission without requiring full re-establishment procedures, thus maintaining high data transmission rates while minimizing processing delays through rapid state transitions.
3Use of energy by moving object
If cell group suspension is implemented to reduce battery consumption, then energy efficiency is improved, but activation latency increases
Solution Approach 1:
The patent performs preliminary channel measurements and maintains configuration information in suspended cell groups, so that when activation is needed, the terminal already possesses necessary measurement data and configuration parameters. This preliminary action eliminates the need for complete re-measurement and re-configuration during activation, significantly reducing activation latency.
Solution Approach 2:
The patent maintains copies of configuration information and measurement results in suspended cell groups. Instead of losing all configuration data upon suspension, the terminal retains essential configuration parameters and measurement information, allowing for rapid reactivation without re-transmitting or re-measuring these parameters, thus reducing activation latency while maintaining energy savings.
Data Source
AI summary
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a terminal in a communication system is provided. The method includes receiving, from a first base station, configuration information for a secondary cell group (SCG) including at least one serving cell associated with a second base station, receiving, from the first base station, a first message for activation or deactivation of the SCG, and in case that the SCG is deactivated based on the first message and uplink data arrives on at least one bearer of the SCG, transmitting a second message for activation of the SCG. According to the disclosure, carrier aggregation and dual connectivity can be quickly activated, thereby reducing battery consumption of a terminal.