Selective SCG Failure Reporting in LTE-NR Dual Connectivity
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Solution Overview
Problem
In dual connectivity scenarios between LTE and NR, coordinating UE capabilities between different systems is challenging, leading to unsuccessful coordination and service suspension when a UE receives an SCG configuration beyond its capabilities, and conventional systems only transmit SCG failure information messages to the master node, limiting error handling.
Innovation Solution
A method for selectively transmitting SCG failure information messages to either the master node (MN) or secondary node (SN) based on the failure type, allowing the UE to suspend SCG transmissions and reconfigure resources, thereby improving error handling and service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SCG failure information message is transmitted only to master node (MN), then system structure is simplified, but error handling capability is limited
Solution Approach 1:
The patent segments the error handling function by dividing the failure information transmission path into two separate channels: one to the master node (MN) and another to the secondary node (SN). This segmentation allows each node to independently handle specific types of failures, improving error handling capability while maintaining a relatively simple overall system structure through dedicated transmission paths.
Solution Approach 2:
The patent introduces a conditional transmission mechanism that acts as an intermediary, determining whether to transmit failure information to MN or SN based on the failure type. This intermediary logic enables flexible error handling without requiring complex multi-node communication protocols, thus improving reliability while controlling system complexity.
2Reliability
If UE transmits SCG failure information to both MN and SN, then error handling is improved, but signaling overhead increases
Solution Approach 1:
The patent implements a dynamic transmission strategy where the destination of failure information (MN or SN) is determined based on the specific failure type. This dynamic approach ensures that information is transmitted only where needed, improving error handling reliability while minimizing unnecessary signaling overhead by avoiding redundant transmissions to both nodes simultaneously.
3Duration of action of stationary object
If UE receives SCG configuration beyond its capabilities, then service continuity is maintained through selective transmission, but coordination complexity between LTE and NR increases
Solution Approach 1:
The patent applies preliminary action by having the UE evaluate its capability compatibility with the received SCG configuration before transmission. This pre-assessment mechanism allows the UE to proactively determine the appropriate transmission destination based on failure type, maintaining service continuity while managing coordination complexity through advance decision-making rather than complex real-time coordination.
Data Source
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AI summary
Provided is a method and device for selectively transmitting a secondary cell group (SCG) failure information message to one of a master node (MN) and a secondary node (SN) in a wireless communication system. A user equipment (UE) detects a failure related to an SCG, and selectively transmits an SCG failure information message to one of an MN and an SN according to a reason for the failure related to the SCG. For example, if the reason for the failure related to the SCG is associated with the size of a hybrid automatic repeat request (HARQ) buffer, the UE ma transmit the SCG failure information message to the SN.