Wireless Communication Node Handover Failure Recovery
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Solution Overview
Problem
Current wireless communication protocols face challenges in minimizing transmission delay and optimizing mobility performance, particularly during handover processes, as they require RRC connection re-establishment and lack efficient simultaneous configuration of Conditional Reconfiguration and Dual Active Protocol Stack (DAPS) handovers.
Innovation Solution
A method is introduced where a node is configured with conditional reconfiguration candidate cells, allowing for the execution of a second handover operation based on the availability of execution conditions within a time window, thereby avoiding RRC connection re-establishment and optimizing handover performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection is performed when handover failure occurs, then the UE can recover from failure, but RRC connection re-establishment is required which increases transmission delay
Solution Approach 1:
The network pre-configures the UE with multiple conditional reconfiguration candidate cells before handover failure occurs. When handover failure occurs, the UE can immediately apply one of the pre-configured candidate cells without needing to perform RRC connection re-establishment, thus reducing transmission delay while ensuring reliable failure recovery
Solution Approach 2:
The patent introduces dynamic UE behavior selection based on configuration type. When both DAPS and CHO are configured, the UE dynamically chooses between returning to source cell or selecting a CHO candidate cell based on whether source cell radio link failure occurs. This dynamic adaptation optimizes the balance between reliability and transmission delay
2Adaptability or versatility
If DAPS and CHO are independently configured, then each handover method can be optimized separately, but the UE behavior after handover failure becomes complex and difficult to optimize
Solution Approach 1:
The patent changes the configuration parameter structure by introducing a unified configuration framework that includes both DAPS and CHO candidate cells. The network configures indication information that specifies whether DAPS and CHO are simultaneously configured, which changes the UE's operational parameters and simplifies the decision-making process by providing clear behavioral rules based on the configuration type
3Reliability
If the UE returns to source cell after handover failure, then the source cell connection is restored, but transmission delay increases and mobility performance deteriorates
Solution Approach 1:
The network pre-configures multiple CHO candidate cells with their respective execution conditions before handover failure occurs. When handover failure occurs, the UE checks whether any pre-configured candidate cell meets the execution conditions and can immediately apply it, avoiding the need to return to the source cell and thus maintaining better mobility performance while ensuring reliable connection restoration
Solution Approach 2:
The patent implements feedback mechanisms where the network provides indication information to the UE about the configuration type (DAPS-only, CHO-only, or both). The UE uses this feedback to determine its post-failure behavior, creating a closed-loop system that optimizes mobility performance by selecting the appropriate recovery path based on network conditions and configuration
Data Source
AI summary
The present application provides a method and a device in a communication node for wireless communications. A communication node receives a first signaling, the first signaling indicates a configuration of a first cell; executes a first handover from a source cell to the first cell which comprises applying the configuration of the first cell; determines first handover failure and executes a first operation; the first operation is a candidate operation in a first candidate operation set which comprises at least two candidate operations of returning to the source cell and executing a second handover; the first operation is related to at least whether the first node is configured with at least one conditional reconfiguration candidate cell; when the first node is not configured with a conditional reconfiguration candidate cell, the first operation is returning to the source cell.