Secondary Node Change Configuration Handling in 5G Base Stations
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Solution Overview
Problem
In the context of 5G wireless communication systems, existing technologies face challenges in handling secondary cell group configurations during secondary node changes, particularly when the target node cannot comprehend the configuration set by the source node or when nodes belong to different vendors, leading to rejection of SN Addition Request messages and the need to release secondary cell groups.
Innovation Solution
A method and base station configuration where the first base station transmits an interface message for a secondary node change to a second base station without including the initial secondary cell group configuration, receives a responding message with a new secondary cell group configuration, and then sends a radio resource control message to the communication device with the new configuration and an indication to release the old configuration, allowing seamless transition to a new secondary node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first base station includes the first SCG configuration in the first interface message to the second base station, then the configuration information is complete for the target node, but the target base station may reject the message if it cannot comprehend the configuration from a different vendor
Solution Approach 1:
The patent extracts the first SCG configuration from the first interface message sent to the second base station. By removing the configuration data that causes vendor incompatibility issues, the message can be successfully processed by the target base station regardless of vendor differences, while the configuration is preserved and transmitted through alternative means (RRC message).
Solution Approach 2:
The first base station acts as an intermediary that receives the first SCG configuration from the communication device, processes it by excluding it from the inter-base station interface message, and then transmits it to the communication device in the RRC message. This intermediary role resolves the vendor compatibility issue while maintaining configuration integrity.
2Loss of information
If the first base station transmits the first SCG configuration to the second base station, then the target node has complete configuration information, but this increases the complexity and potential for configuration conflicts
Solution Approach 1:
The patent segments the configuration transmission into two separate channels: (1) the first interface message between base stations that excludes the SCG configuration to avoid complexity and conflicts, and (2) the RRC message from the first base station to the communication device that includes the complete SCG configuration. This segmentation resolves the contradiction by delivering complete information without creating configuration management complexity in the inter-base station interface.
3Productivity
If the second base station receives the first SCG configuration from the first base station, then it can potentially use the existing configuration, but it may reject the SN Addition Request if the configurations are incompatible
Solution Approach 1:
The patent applies preliminary action by having the first base station prepare the RRC message with the first SCG configuration in advance, before the second base station processes the SN Addition Request. This ensures the communication device receives the necessary configuration information proactively, allowing the node change to proceed efficiently without requiring the second base station to comprehend or reuse the first base station's configuration, thereby avoiding compatibility rejection issues.
Data Source
AI summary
A first base station is configured to execute instructions of the first BS transmitting a first interface message to a second BS for a secondary node change from a third BS to the second BS, wherein the first interface message does not comprise the first SCG configuration; the first BS receiving a second interface message responding to the first interface message, from the second BS, wherein the second interface message comprises a second SCG configuration; and the first BS transmitting a radio resource control message to a communication device, wherein the RRC message comprises the second SCG configuration and an indication indicating release of SCG.