Secondary Cell Group Release for Unsupported 5G Bandwidth
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Solution Overview
Problem
In a 5G and 4G network coexistence scenario, frequent re-establishment of 4G network connections occurs due to terminal devices not supporting configured 5G bandwidths, affecting communication quality.
Innovation Solution
A terminal device sends indication information when it cannot support the configured 5G bandwidth, allowing the network to release the secondary cell group (SCG) to avoid repeated 4G re-establishments, using existing NR SCG failure information to indicate abnormalities and manage SCG configuration failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device sends indication information to report SCG configuration failure, then the network device can release the SCG to avoid frequent 4G re-establishments, but this increases signaling overhead between the terminal device and network device
Solution Approach 1:
The terminal device sends indication information proactively when it detects SCG configuration failure (bandwidth mismatch), allowing the network device to release the SCG before the terminal device is forced to re-establish the 4G connection. This preliminary reporting action prevents the harmful cycle of frequent re-establishments.
Solution Approach 2:
The indication information acts as an intermediary signal that carries SCG failure cause information from the terminal device to the network device. This intermediary communication enables the network device to make informed decisions about SCG release without requiring full re-establishment procedures.
2Adaptability or versatility
If the terminal device frequently re-establishes the 4G network connection due to unsupported 5G bandwidth, then the terminal device can attempt to add SCG again, but this frequently re-establishing 4G connection affects communication quality
Solution Approach 1:
The terminal device provides feedback to the network device through indication information when SCG configuration fails due to bandwidth mismatch. This feedback loop enables the network device to recognize the terminal's capability limitations and adjust future SCG configuration decisions, preventing repeated failures and maintaining communication quality.
Data Source
AI summary
This application provides a secondary cell group configuration method and apparatus. The method includes: receiving an LTE RRC reconfiguration message, where the LTE RRC reconfiguration message includes an NR configuration parameter, and the NR configuration parameter is used to configure an SCG; sending indication information when a terminal device does not support a configuration of the SCG, where the indication information is used to indicate that the SCG is abnormal. After receiving the indication information, if the network device determines that the terminal device needs to release the SCG, the network device may indicate the terminal device to release the SCG.