Conditional Handover Configuration Management via Concurrent Storage
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Solution Overview
Problem
During conditional handover in wireless communication networks, intermediate RRC reconfigurations can lead to inconsistencies between the UE's RRC configuration and the target cell's stored configuration, potentially causing handover failures.
Innovation Solution
The proposed solution involves checking if the target cell is configured to store concurrently multiple configuration data sets of a terminal. If so, the source cell can directly send a new Handover Request without canceling the existing Conditional Handover, ensuring consistent configurations and avoiding unnecessary signaling or delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the source cell performs RRC reconfiguration of the terminal after configuring conditional handover, then the RRC parameters can be updated to adapt to changing network conditions, but inconsistencies arise between the terminal's configuration and the target cell's stored configuration, potentially causing handover failures
Solution Approach 1:
The target cell stores multiple configuration data sets (first configuration data set from initial CHO request, second configuration data set from subsequent CHO request) in advance before the handover execution. This preliminary storage of multiple configurations allows the target cell to be prepared for different possible terminal states, eliminating the need for the source cell to cancel CHO before reconfiguration and ensuring consistent configurations during handover execution
Solution Approach 2:
The patent introduces an indication mechanism as an intermediary between the source cell and target cell. The source cell sends an indication to the target cell about whether to store multiple configuration data sets concurrently. This intermediary communication channel coordinates the configuration management between source and target cells, allowing the target cell to appropriately handle multiple configurations without causing inconsistencies during handover execution
2Reliability
If the source cell cancels the existing Conditional Handover to perform RRC reconfiguration, then configuration consistency is maintained, but unnecessary signaling and delays occur
Solution Approach 1:
The target cell performs preliminary storage of multiple configuration data sets before handover execution. By having both the first and second configuration data sets ready in advance, the target cell eliminates the need for source cell cancellation actions, thereby avoiding unnecessary signaling and delays while maintaining configuration consistency through the indication mechanism
3Quantity of substance
If the target cell stores only the latest configuration data set, then storage resources are conserved, but handover execution may fail when the terminal has different configuration due to intermediate reconfiguration
Solution Approach 1:
The target cell stores multiple configuration data sets (both first and second configuration data sets) in advance based on the indication from the source cell. This preliminary multi-configuration storage ensures that regardless of which configuration the terminal has after intermediate reconfiguration, the target cell can successfully execute handover by matching the terminal's actual configuration, thereby improving handover execution success rate
Solution Approach 2:
The patent changes the storage parameter of the target cell from storing only one configuration data set to storing multiple configuration data sets concurrently. This parameter change is controlled by the indication mechanism, allowing flexible adaptation between storing single or multiple configurations based on network conditions and terminal reconfiguration status
Data Source
AI summary
It is provided a method comprising: checking if an indication indicates that a target cell is configured to store concurrently first and second configurations of a terminal, wherein the first configuration is based on a first conditional handover request, and the second configuration data set is based on a second conditional handover request; monitoring if the source cell intends performing a radio reconfiguration of the terminal after the source cell configured the terminal for the first conditional handover; canceling the first conditional handover if the source cell intends performing the radio reconfiguration and the indication does not indicate the concurrently storing; instructing the source cell to request the second conditional handover from the target cell if the source cell intends performing the radio reconfiguration and the indication indicates the concurrently storing.