Handover Failure Handling in MR-DC via Secondary Node Feedback
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Solution Overview
Problem
In the context of R16 Carrier Aggregation (CA)-Dual Connectivity (DC) enhancement, handover failures in Mobile Radio Dual Connectivity (MR-DC) scenarios lead to service interruptions and data loss due to the inability to report Master Cell Group (MCG) failure information effectively, triggering unnecessary Radio Resource Control (RRC) connection reestablishment.
Innovation Solution
A method where a terminal sends handover failure and MCG failure information to a target secondary node, which then forwards this information to a target master node or an original master node to determine a new handover procedure, avoiding RRC connection reestablishment and minimizing service disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a handover procedure is triggered to avoid MCG failure, then service continuity is improved, but handover failure occurs leading to RRC connection reestablishment and data loss
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends failure information (including handover failure information and MCG failure information) to the network side through the secondary node. This feedback allows the network to accurately identify the failure cause and make informed decisions about initiating appropriate handover procedures, thereby improving service continuity while avoiding unnecessary RRC connection reestablishment and data loss.
Solution Approach 2:
The patent introduces the secondary node as an intermediary between the terminal device and the master node. The secondary node receives failure information from the terminal, determines whether handover is needed, and forwards relevant information to the appropriate master node (target or original). This intermediary role enables efficient failure handling and handover coordination, improving service continuity while preventing data loss through proper information routing.
2Reliability
If handover failure information is not reported, then RRC connection reestablishment is avoided, but service interruption occurs due to inability to determine new handover procedure
Solution Approach 1:
The patent enables preliminary action by having the terminal device proactively report failure information to the network side through the secondary node before service interruption occurs. The network side can then pre-determine the appropriate handover procedure based on this early feedback, reducing service interruption time and ensuring continuous service without unnecessary RRC connection reestablishment.
3Reliability
If MCG failure information is sent through SCG link, then handover can be triggered to avoid MCG failure, but handover failure occurs causing RRC connection reestablishment
Solution Approach 1:
The patent uses the secondary node as an intermediary to receive failure information from the terminal and determine the appropriate action. Instead of directly triggering handover based on MCG failure information sent through the SCG link, the secondary node evaluates the situation and forwards information to the appropriate master node only when necessary. This intermediary approach prevents premature or incorrect handover decisions that could lead to handover failure and data loss.
Solution Approach 2:
The patent implements a refined feedback mechanism where the terminal sends both handover failure information and MCG failure information to the network side through the secondary node. This comprehensive feedback allows the network to accurately assess whether handover is truly needed, triggering handover only when appropriate and avoiding unnecessary RRC connection reestablishment that would cause data loss.
Data Source
AI summary
Provided are a handover method and apparatus, and a communication device. The method includes: after a terminal determines that a handover failure occurs or when a handover timer times out, sending first information to a target secondary node, wherein the first information includes handover failure information and/or MCG failure information; and the first information is forwarded to a target master node by the target secondary node, and the target master node determines a new handover process, or, the first information is forwarded to the target master node by the target secondary node and then forwarded to an original master node by the target master node, and the original master node determines the new handover process.