5G Secondary Cell Group Configuration for Faster Connection Resumption
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Solution Overview
Problem
The communication connection to a secondary node is resumed at a relatively low rate when a terminal transitions from a third mode to a connected mode in 5G networks, due to the lengthy process of reconfiguring a secondary cell group (SCG) during the transition.
Innovation Solution
A first master node determines a secondary node and obtains security parameters and SCG configuration information, which are then sent to the terminal to facilitate direct communication setup with the secondary node, thereby improving the efficiency of SCG configuration and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master node reconfigures a secondary node for the terminal during transition from third mode to connected mode, then the terminal can establish communication connection to the secondary node, but the reconfiguration process takes a relatively long time
Solution Approach 1:
The master node performs preliminary actions by determining the secondary node and obtaining SCG configuration information before the terminal transitions to connected mode. The master node sends the second message with security parameter and SCG configuration information to the terminal in advance, so that when the terminal resumes from third mode, the necessary configuration is already prepared and can be directly applied without lengthy reconfiguration procedures.
2Productivity
If the master node sends security parameter and SCG configuration information to the terminal, then the terminal can directly complete communication connection to the secondary node, but the master node needs to perform determination and obtaining operations first
Solution Approach 1:
The master node merges multiple operations (determining secondary node, obtaining security parameter, obtaining SCG configuration information) into a single streamlined process. These operations are consolidated and executed efficiently, then the results are packaged into the second message sent to the terminal. This merging reduces the overall complexity burden on the master node while enabling direct and efficient SCG configuration completion by the terminal.
Data Source
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Figure 3(a)~5(b)
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AI summary
Embodiments of this application disclose a communication method and a communications apparatus and system, and relate to the field of communications technologies, to resolve a problem that a terminal cannot quickly resume a communication connection to a secondary node. The method includes: receiving, by a first master node, a first message from a terminal, where the first message is used to request state transition of the terminal from a third mode to a connected mode; determining, by the first master node, a secondary node that serves the terminal; obtaining, by the first master node, a first security parameter, where the first security parameter is used to derive a security key used for communication between the terminal and the secondary node that serves the terminal; obtaining, by the first master node, SCG configuration information, where the SCG configuration information includes at least one of a random access resource allocated to the terminal by the secondary node that serves the terminal, information about a serving cell set of the secondary node that serves the terminal, and indication information of a master cell of the secondary node that serves the terminal; and sending, by the first master node, a second message to the terminal, where the second message includes the first security parameter and the SCG configuration information.