Conditional Handover Release Logic for MR-DC Configuration
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Solution Overview
Problem
The integration of Conditional Handover (CHO) procedures with Multi-Radio Dual Connectivity (MR-DC) in wireless communication networks is not explicitly addressed, leading to issues such as potential handover failures, Radio Link Failures (RLF), and mismanagement of SN terminated bearers due to outdated configurations during handover execution.
Innovation Solution
A method where the UE receives a CHO configuration indicating the release of MR-DC and SN terminated bearers, and upon fulfilling the CHO conditions, it autonomously releases these configurations, ensuring up-to-date handling of SN-related configurations during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains MR-DC configuration during Conditional Handover execution, then connectivity diversity is preserved, but configuration inconsistencies and handover failures occur due to outdated SN configurations
Solution Approach 1:
The patent applies preliminary action by including release indications for MR-DC and SN terminated bearers in the CHO configuration message sent from the source gNB to the UE before handover execution. This ensures that when the CHO is executed, the UE already has the correct instruction to release outdated configurations, preventing configuration inconsistencies and handover failures.
Solution Approach 2:
The patent implements feedback by having the target gNB provide information about SN terminated bearers and MR-DC configuration status during the handover preparation phase. This feedback allows the source gNB to include appropriate release indications in the CHO configuration, ensuring the UE releases configurations that are no longer valid at the target cell.
2Manufacturing precision
If the UE releases SN terminated bearers upon CHO execution, then configuration accuracy is improved, but additional signaling and processing are required
Solution Approach 1:
The patent reduces complexity by applying preliminary action - the source gNB determines which SN terminated bearers need to be released and includes this information in the CHO configuration message before the UE executes the handover. This eliminates the need for complex post-handover configuration updates and reduces signaling overhead.
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously release SN terminated bearers and MR-DC configurations based on release indications included in the CHO configuration. The UE uses its own judgment to release configurations without requiring additional network signaling, simplifying the overall handover procedure.
Data Source
AI summary
A method performed by a User Equipment (UE) for handling a Conditional Handover (CHO) from a first cell to a second cell in a wireless communications network. The UE is served by a Master Node (MN), in the first cell and by a Secondary Node (SN) in a third cell. The UE receives a CHO configuration from the first network node acting as the MN. The CHO configuration includes an indication to release configurations of any one or more out of: Multi Radio Access Technology Dual Connectivity (MR-DC), and SN terminated bearers. Upon execution of the CHO according to the CHO configuration, the UE releases the MR-DC configuration and/or a configuration for SN terminated bearers.