SRB3 Configuration and SCG Failure Handling in Dual Connectivity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling signaling radio bearer type 3 (SRB3) and secondary cell group (SCG) failures, particularly in dual connectivity scenarios, which can lead to network instability and reduced performance.
Innovation Solution
A method and apparatus for managing SRB3 and SCG failures through specific communication exchanges between a user equipment (UE) and secondary nodes, including configuration and release procedures, to ensure robust connectivity and minimize disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRB3 is configured for direct communication between UE and secondary node, then communication efficiency is improved, but network complexity increases
Solution Approach 1:
The patent segments the signaling bearer configuration into multiple types (SRB1, SRB2, SRB3) with different functions and management approaches. SRB3 is specifically configured for direct UE-to-secondary-node communication, separating this functionality from other signaling paths and enabling optimized handling of secondary node communications.
Solution Approach 2:
The patent introduces the master node as an intermediary that manages SRB3 configuration and release. The master node coordinates with both the UE and secondary node, controlling when SRB3 is activated and deactivated based on dual connectivity conditions, thereby managing the complexity of direct UE-secondary node communication.
2Loss of energy
If SRB3 is released during SCG failure, then resource utilization is improved, but communication reliability deteriorates
Solution Approach 1:
The patent implements preliminary actions by configuring the UE with fallback RRC message transmission capabilities before SCG failure occurs. The UE is pre-prepared to send RRC reconfiguration complete messages and failure indication messages through alternative paths (SRB1 via master node) when SRB3 becomes unavailable, ensuring continuous communication reliability.
Solution Approach 2:
The patent establishes feedback mechanisms where the UE monitors SCG connection status and provides feedback about SRB3 availability. When SCG failure is detected, the UE sends feedback messages to the network indicating the failure condition, enabling the network to adjust resource allocation and maintain communication through alternative bearers.
3Loss of time
If direct UE-secondary node communication is enabled, then latency is reduced, but system robustness decreases
Solution Approach 1:
The patent implements dynamic configuration of SRB3 based on dual connectivity conditions. The master node configures SRB3 when the UE is in dual connectivity mode with a secondary node, enabling low-latency direct communication. When SCG failure occurs or dual connectivity is released, the system dynamically transitions to using only SRB1/SRB2 through the master node, maintaining system robustness through adaptive bearer management.
Data Source
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AI summary
A user equipment (UE) can include processing circuitry configuring the UE for Dual Connectivity (DC) with a Master Node-B (MN) and a Secondary Node-B (SN). The processing circuitry is to decode connection reconfiguration information received from the MN. The connection reconfiguration information includes signaling radio bearer type 3 (SRB3) configuration information. The SRB3 configuration information originating from the SN and configuring a SRB3, where the SRB3 is for direct communication between the UE and the SN. At least one of a radio resource control (RRC) reconfiguration completion message or a measurement report message is encoded for transmission to the SN.