5G UE SRB Selection for Radio Link Failure
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Solution Overview
Problem
In the context of 5G NR DC scenarios, there is a challenge in determining the appropriate signaling radio bearers (SRBs) for user equipment (UE) to transmit radio link failure information efficiently, especially when multiple connections are configured, which can lead to delays and reliability issues in communication.
Innovation Solution
The method involves detecting radio link failures in user equipment and determining which SRBs, either MCG split SRB or SCG SRB, are operational and suitable for transmitting the failure message, based on indications from the base stations and link quality assessments, allowing for reliable and timely communication by suspending data radio bearers and selecting the best available SRB for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If all measurement and reconfiguration information is transmitted through MeNB via the interface between MeNB and SeNB, then centralized control is maintained, but transmission delay increases
Solution Approach 1:
The patent segments the signaling radio bearers into two types: MCG SRB for centralized control functions and SCG SRB for time-sensitive functions. This segmentation allows measurement and reconfiguration information to be transmitted directly through SeNB via SCG SRB, bypassing the MeNB interface for these specific functions, thus reducing transmission delay while maintaining centralized control through the MCG SRB path.
2Reliability
If MCG split SRB is used for radio link failure notification, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic selection of signaling radio bearers based on the operational status of the MCG and SCG. The UE determines whether to use MCG split SRB or SCG SRB for radio link failure notification based on real-time link conditions and configuration. This dynamic approach allows the system to use the more reliable MCG split SRB when available, while falling back to SCG SRB when MCG is unavailable, thus maintaining reliability without requiring complex permanent dual-path configurations.
3Adaptability or versatility
If multiple types of SRBs are configured for different functions, then adaptability is improved, but ease of operation deteriorates
Solution Approach 1:
The patent introduces a base station as an intermediary that provides explicit indications to the UE about which SRB type to use for specific purposes. The base station configures and signals the appropriate SRB selection, eliminating the need for the UE to independently determine complex SRB selection policies. This intermediary approach maintains the adaptability benefits of multiple SRB types while simplifying UE operation through centralized guidance.
Data Source
AI summary
The present disclosure provides a method used in user equipment (UE), the user equipment being provided with one or more signaling radio bearers (SRBs) comprising a master cell group (MCG) split SRB and/or one or more secondary cell group (SCG) SRBs, and the method comprising: detecting a radio link failure between the UE and an MCG base station; determining, in the configured one or more SRBs, one or more SRBs for transmitting a message related to the radio link failure; and transmitting the message by means of the determined one or more SRBs.