PSCell Recovery Logic for Conditional PSCell Change Failures
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Solution Overview
Problem
Existing communication systems face inefficiencies in handling Conditional PSCell Change (CPC) failures in 5G networks, leading to increased signaling overhead and prolonged recovery times due to the lack of optimized procedures for Conditional PSCell Addition (CPA) when multiple target cells are prepared.
Innovation Solution
A new procedure is introduced that provides assistance information to user equipment (UE) about candidate PSCells sharing a common master cell group configuration, allowing for optimized CPA recovery by selecting suitable PSCells based on signal quality thresholds and reducing the need for SCG-Failure Indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal attempts to connect with multiple candidate PSCells after a failure condition, then connection reliability is improved, but signaling overhead increases due to additional connection attempts and indications
Solution Approach 1:
The network pre-configures multiple candidate PSCells and their associations with master cell configurations before connection failure occurs. This preliminary preparation enables the terminal to quickly attempt alternative connections without extensive signaling exchanges during the recovery process, thus improving reliability while controlling signaling overhead.
Solution Approach 2:
The terminal provides feedback to the network about connection failure conditions and which candidate PSCells are being attempted. The network uses this feedback to provide assistance information about candidate PSCell associations, enabling optimized recovery procedures that balance reliability improvement with signaling overhead management.
2Loss of time
If the terminal uses assistance information to determine whether to attempt connection with the second candidate PSCell, then recovery time is reduced, but device complexity increases due to additional determination logic
Solution Approach 1:
The network provides assistance information in advance that indicates which candidate PSCells are associated with a common master cell configuration. This pre-provided information allows the terminal to make quick determination decisions without complex real-time analysis, reducing recovery time while keeping the determination logic relatively simple.
Solution Approach 2:
The terminal autonomously determines whether to attempt connection with the second candidate PSCell by using the provided assistance information and its own failure condition assessment. This self-service approach enables fast recovery decisions without requiring continuous network control, reducing both recovery time and the need for complex centralized determination logic.
Data Source
AI summary
The following relates to an apparatus for a terminal, the apparatus comprising: means for receiving, from a master access point, assistance information, the assistance information comprising configuration information for a first candidate Primary Secondary Cell, PSCell, and a second candidate PSCell, and a first indication of whether the first and second candidate PSCell are associated with a common master cell configuration; and means for determining a failure condition that occurred when connecting with the first candidate PSCell; means for, in response to the determining, using the first indication to determine whether to attempt to connect with the second candidate PSCell.