RRC Reconfiguration Delta Updates for Secondary Node Mobility
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Solution Overview
Problem
The mobility scenario of secondary nodes (SN) in wireless communication systems, particularly in inactive and suspend states, has not been adequately addressed in existing technologies, especially in dual connectivity (DC) scenarios.
Innovation Solution
A method and apparatus for RRC reconfiguration in wireless communication systems, involving a master node (MN) that transmits RRC reconfiguration parameters, requests and receives UE context from source and target SNs, and applies delta configurations for seamless SN mobility, including inactive and suspend states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RRC reconfiguration parameters are transmitted for SN mobility in inactive and suspend states, then UE performance is enhanced and system efficiency is improved, but signaling overhead and complexity of the reconfiguration process increase
Solution Approach 1:
The RRC reconfiguration parameters are segmented into a full configuration and a delta configuration. The full configuration contains complete RRC parameters, while the delta configuration contains only the changed parameters. This segmentation allows the UE to apply only the necessary updates rather than processing complete reconfiguration sets, reducing signaling overhead and processing complexity while maintaining system efficiency.
Solution Approach 2:
The source SN stores the full RRC configuration in the UE context before mobility. When SN change occurs, this pre-stored configuration is retrieved and compared with the target SN requirements to generate the delta configuration. This preliminary action eliminates the need for the UE to receive and process complete reconfiguration parameters, reducing signaling overhead while ensuring accurate configuration updates.
2Loss of information
If delta configuration is used for RRC reconfiguration, then signaling overhead is reduced, but the precision and completeness of configuration transfer may be compromised
Solution Approach 1:
The system implements feedback through the SN addition request acknowledgment message, which carries the delta configuration from target SN to source SN. The source SN uses this feedback to determine the exact configuration changes needed. This feedback mechanism ensures that only necessary configuration parameters are transferred with high precision, reducing signaling overhead while maintaining configuration accuracy.
Solution Approach 2:
The source SN acts as an intermediary between the target SN and the UE. It receives the full configuration requirements from the target SN, compares them with the stored UE context, and generates the delta configuration. This intermediary role ensures precise configuration transfer by filtering and translating configuration data, reducing the information that needs to be signaled to the UE while maintaining completeness.
3Adaptability or versatility
If suspend and resume functionality is implemented for ReconfigurationWithSync parameters, then mobility scenario support is improved, but the complexity of state management increases
Solution Approach 1:
The RRC configuration structure is designed to be universal, supporting both connected and inactive/suspend states through the same framework. The ReconfigurationWithSync parameters can be suspended and resumed without requiring separate handling mechanisms for different states. This multi-functionality approach enables broad mobility scenario support while avoiding the complexity of separate state management systems.
Data Source
AI summary
The present disclosure relates to a reconfiguration in a wireless communication system. According to various embodiments, a method performed by a master node (MN) serving a wireless device with a source secondary node (SN) in a dual connectivity (DC) in a wireless communication system comprises: transmitting, to the wireless device, radio resource control (RRC) reconfiguration parameters; transmitting, to the source SN, a request message for a user equipment (UE) context stored in the source SN; receiving, from the source SN, a response message comprising the UE context; transmitting, to a target SN, a SN addition request message comprising the UE context; receiving, from the target SN, a SN addition request acknowledgement message comprising a delta configuration for the RRC reconfiguration parameters, wherein the delta configuration comprises a configuration that is changed with respect to the RRC reconfiguration parameters in the UE context; and transmitting, to the wireless device, a RRC reconfiguration message for SN mobility comprising the delta configuration.