Radio Bearer Reconfiguration for SCG Failure Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-Advanced systems, user equipment (UE) faces challenges in continuing communication operations with base stations when a radio link failure (RLF) occurs, particularly with secondary eNBs, leading to irregular operations if not properly handled.
Innovation Solution
A communication method and system that enables a UE to detect radio link failures, suspend and resume communication with secondary base stations by transmitting SCG failure information and receiving RRC messages to reconfigure radio bearers from SCG to MCG, ensuring continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continues communication operations with the secondary eNB after detecting RLF, then communication continuity may be maintained, but communication reliability deteriorates due to irregular operations and potential service disruptions
Solution Approach 1:
The UE performs preliminary actions by suspending the SCG bearer immediately upon detecting RLF or SCG change failure, before attempting to recover communication. This preliminary suspension prevents irregular operations and maintains communication reliability, while the subsequent recovery process through RRC messages ensures communication continuity is restored
Solution Approach 2:
The system implements feedback mechanisms where the UE transmits SCG failure information messages to the MeNB, which then responds with RRC messages to reconfigure the radio bearer from SCG to MCG. This feedback loop ensures that communication reliability is maintained through proper error handling while restoring communication continuity
2Reliability
If the UE suspends and reconfigures radio bearers from SCG to MCG after RLF, then communication reliability is improved, but communication operation time increases due to recovery procedures
Solution Approach 1:
The UE prepares for potential RLF by having the RRC reconfiguration procedure ready to execute quickly. The suspension of SCG bearer and transition to MCG bearer are preliminary actions that can be performed rapidly, minimizing time loss while ensuring reliability through proper reconfiguration
Solution Approach 2:
The system changes the bearer configuration parameter from SCG to MCG upon detecting RLF. This parameter change allows the UE to quickly switch to a reliable communication path through the MeNB, restoring communication operations with minimal time loss while maintaining reliability
3Productivity
If the UE maintains SCG bearer configuration after RLF, then communication operation speed is preserved, but communication reliability deteriorates due to irregular operations
Solution Approach 1:
The UE immediately suspends the SCG bearer as a preliminary action upon detecting RLF, preventing irregular operations that would compromise reliability. This quick suspension maintains operation speed by avoiding prolonged failed communications, and the subsequent reconfiguration restores reliable high-speed communication through the MCG bearer
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A communication device of handling a communication operation with a first base station and a second base station comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise performing a communication operation with the second base station via a radio bearer configured as a SCG bearer; detecting a radio link failure on a cell of the second base station or a SCG change failure; suspending the radio bearer and transmitting a SCG failure information message in response to the detection of the radio link failure to the first base station; receiving a radio resource control (RRC) message configuring the radio bearer as a MCG bearer from the first base station; and resuming the second radio bearer in response to the reception of the RRC message.