UE Master Node Failure Reporting via Split SRB Secondary Path
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Solution Overview
Problem
Current methods for reporting Master Node (MN) radio link failures in New Radio (NR) networks are inefficient, particularly when a User Equipment (UE) is configured with a split signaling radio bearer (SRB), leading to potential handover failures due to the inability to send measurement reports.
Innovation Solution
A method for a UE to detect MN radio link failures, determine if configured with a split SRB, and transmit an MN failure report using the secondary node (SN) path of the split SRB, while maintaining measurement configurations and suspending transmissions, thereby avoiding RRC reestablishment and ensuring continuous measurement reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses the MCG path for transmitting failure reports, then the reporting method is simple, but the handover reliability deteriorates due to inability to send measurement reports after MN radio link failure
Solution Approach 1:
The split SRB is divided into two independent paths: MCG path and SCG path. The UE can selectively use the SCG path for transmitting failure reports and measurement reports when MN radio link failure occurs, while the MCG path remains available for normal operations. This segmentation allows the system to maintain reporting capability through the SCG path when the MCG path fails, thereby improving handover reliability without significantly increasing overall system complexity.
2Loss of energy
If the UE suspends all transmissions to MN after radio link failure, then transmission resources are preserved, but measurement reporting continuity deteriorates
Solution Approach 1:
The UE applies different transmission strategies to different paths: the MCG path transmissions are suspended to preserve resources and avoid interference, while the SCG path transmissions continue normally to maintain measurement reporting capability. This localized differentiation allows the system to preserve transmission resources where needed while maintaining measurement continuity through the SCG path, resolving the contradiction between resource preservation and reporting continuity.
Data Source
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AI summary
Some of the present implementations provide a method for a user equipment (UE) for reporting a master node (MN) failure. The method, in some of the present implementations detects, at the UE, a failure in a radio link to the MN. The method determines whether the UE is configured with a split signaling radio bearer (SRB). The method then transmits an MN failure report to the MN using a secondary node (SN) path of the split SRB after determining that the UE is configured with the split SRB. The method of some of the present implementations maintains current measurement configurations received from the MN and the SN, and continues to perform measurements based on the configurations received from the MN and the SN after determining that the radio link to the MN has failed.