SCG Failure Reporting via Split Messages During MCG Suspension
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Solution Overview
Problem
In wireless communication systems with dual connectivity, preserving secondary cell group (SCG) failure information becomes challenging when the master cell group (MCG) is suspended, as the UE cannot immediately transmit SCG failure reports to the network, leading to a lack of critical information for optimizing radio access channel performance and mobility policies.
Innovation Solution
The UE stores additional information related to SCG failure, such as PSCell identifiers and timing of reconfiguration, and transmits this information in separate messages when the MCG is suspended, allowing the network to analyze and optimize SCG-related cell performance even during MCG suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE transmits SCG failure information via the MCG, then the network can analyze and optimize SCG-related cell performance, but the UE cannot transmit this information when the MCG is suspended
Solution Approach 1:
The patent introduces a third network node as an intermediary to receive SCG failure information from the UE when the MCG is suspended. This intermediary node acts as a temporary storage point, allowing the information to be preserved and later forwarded to the original MCG once it becomes available again, thus resolving the transmission blockage caused by MCG suspension
Solution Approach 2:
The patent enables preliminary transmission of SCG failure information to a third network node before the MCG becomes available again. By performing the transmission action in advance to an alternative destination, the system ensures that critical failure information is not lost during MCG suspension periods
2Reliability
If the UE stores additional SCG failure information, then the network can optimize radio access channel performance, but the message size increases
Solution Approach 1:
The patent segments the SCG failure information into distinct components (first set of information and second set of information). The first message contains essential failure information, while the second message contains additional contextual information. This segmentation allows the network to receive comprehensive data while organizing it in a structured, manageable format that reduces processing complexity
3Loss of time
If the UE transmits SCG failure information immediately upon detection, then the information is fresh and useful for optimization, but the transmission may fail if the MCG is suspended
Solution Approach 1:
The patent implements a dynamic transmission strategy where the UE adapts its information transmission behavior based on the MCG's operational state. When the MCG is available, transmission occurs immediately; when suspended, the UE transitions to storing information locally or transmitting to alternative nodes. This dynamic approach balances timeliness with transmission reliability
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device operating in dual connectivity with a master cell group (MCG) comprising a first network node and a secondary cell group (SCG) comprising a second network node. The method comprises: detecting a failure on the SCG; including a first set of information associated with the detected failure on the SCG in a first message; and determining whether the MCG is suspended. Upon determining the MCG is suspended, the method further comprises including a second set of information associated with the detected failure on the SCG in a second message and transmitting the first message and the second message to a third network node.