Dual-Connectivity QoE Reporting via Split SRB4 Path Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting application layer measurement reporting, particularly in 5G New Radio-Dual Connectivity (NR-DC) scenarios, where mobility continuity and efficient reporting of Quality of Experience (QoE) measurements are required, especially for high-speed scenarios like trains and flights, with current specifications lacking support for SRB4 in dual connectivity.
Innovation Solution
The implementation of a split signaling radio bearer 4 (SRB4) for QoE reporting, allowing segmented transmission of application layer measurement reports via both the master node (MN) and secondary node (SN) in dual connectivity mode, with dynamic control of reporting paths based on RAN load and UE conditions, ensuring continuity and optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If application layer measurement reporting is implemented in NR-DC scenarios using traditional signaling bearers, then measurement reporting can be supported, but mobility continuity and reporting efficiency are degraded due to lack of SRB4 support and inability to handle high-speed scenarios
Solution Approach 1:
The signaling radio bearer is segmented into multiple components: SRB4 is separated from traditional signaling bearers (SRB1, SRB2, SRB3) and specifically allocated for application layer measurement reporting in NR-DC scenarios. This segmentation allows SRB4 to be optimized independently for QoE reporting while other SRBs handle traditional signaling, resolving the contradiction by providing dedicated support for NR-DC measurement reporting without compromising existing signaling functions
Solution Approach 2:
The patent implements dynamic path selection for measurement reporting by allowing the UE to switch between different reporting paths (MN-terminated or SN-terminated SRB4) based on current network conditions and UE mobility state. This dynamic adaptability enables reliable QoE reporting in high-speed scenarios while maintaining compatibility with traditional NR-DC operation, thus improving both reliability and adaptability
2Reliability
If measurement reports are transmitted through a single path in dual connectivity mode, then the system complexity is reduced, but reporting reliability and continuity are degraded during node changes or high-speed mobility
Solution Approach 1:
The patent introduces the master node as an intermediary that coordinates the split SRB4 configuration. The MN configures and manages the SRB4 bearer, which can be terminated at either the MN or SN based on current conditions. This intermediary role of the MN simplifies the overall system architecture by providing centralized control over the complex split bearer configuration, reducing device complexity while maintaining reporting reliability through coordinated multi-path support
3Measurement precision
If QoE reporting is optimized for high-speed scenarios with segmented transmission, then measurement accuracy and continuity are improved, but the configuration and management complexity increases
Solution Approach 1:
The patent implements dynamic path selection where the UE can switch between MN-terminated and SN-terminated SRB4 paths based on real-time conditions such as node changes, mobility speed, and radio link quality. This dynamic adaptation ensures continuous and accurate QoE reporting in high-speed scenarios without requiring complex static configurations, as the system automatically adjusts the reporting path to maintain measurement precision while managing complexity through runtime adaptability
Data Source
AI summary
A user equipment (UE) includes a transceiver and a processor that is configured to connect the UE to a master node (MN) in a master cell group (MCG) and a secondary node (SN) in a secondary cell group (SCG). The processor is configured to perform an application layer measurement for an application on the UE, and generate an application layer measurement report. The processor is configured to transmit, via the transceiver, the application layer measurement report in one or more segments to at least one of the MN or the SN based on an application layer measurement configuration describing at least one cell group for transmitting the application layer measurement report to a network.