Conditional Handover Configuration for CPAC Evaluation
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Solution Overview
Problem
In dual connectivity (DC) systems, the process of conditional primary secondary cell addition or change (CPAC) requires a conditional reconfiguration from the network, but existing technologies lack a method for the terminal to evaluate execution conditions for CPAC candidate cells effectively, hindering primary secondary cell changes during conditional handover.
Innovation Solution
A conditional handover configuration method where a terminal receives a message including configurations for CHO and CPAC candidate cells, with an execution condition for CPAC candidate cells linked to a measurement identifier of a specific measurement configuration, such as MCG, SCG, target MCG, or target SCG, allowing the terminal to evaluate and perform primary secondary cell additions or changes during conditional handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional reconfiguration is provided for CPAC candidate cells, then the terminal can perform CPAC evaluation and PSCell addition/change, but the measurement configuration complexity increases due to multiple measurement types (MCG, SCG, target MCG, target SCG)
Solution Approach 1:
The patent segments the measurement configuration into four distinct types (MCG, SCG, target MCG, target SCG), each with its own measurement identifier. This segmentation allows the terminal to clearly distinguish which measurement configuration applies to which CPAC candidate cell, reducing confusion and enabling reliable CPAC evaluation despite the increased number of configurations.
Solution Approach 2:
The patent introduces measurement identifiers as intermediaries that link execution conditions to specific measurement configurations. Each execution condition contains a measurement identifier that points to the appropriate measurement configuration (MCG/SCG/target MCG/target SCG), serving as a mediator that simplifies the relationship between multiple measurement types and their corresponding CPAC candidate cells.
2Measurement precision
If multiple measurement configurations are supported for different CPAC candidate cells, then accurate cell evaluation is enabled, but the signaling overhead and configuration message size increase
Solution Approach 1:
The patent extracts the measurement identifier from the full measurement configuration and places it directly in the execution condition. This extraction allows the terminal to reference the complete measurement configuration through a compact identifier, reducing the amount of information that needs to be transmitted in the conditional handover message while maintaining the ability to perform accurate cell evaluation.
Solution Approach 2:
The patent performs preliminary configuration by establishing the relationship between measurement identifiers and measurement configurations before the CPAC evaluation process. The network configures multiple measurement configurations in advance (MCG, SCG, target MCG, target SCG) and associates each with a unique identifier, so that during CPAC evaluation, the terminal can efficiently reference the appropriate configuration without receiving redundant information.
Data Source
AI summary
This application discloses a conditional handover configuration method, a terminal, and a network side device. The method includes: a terminal receives a conditional handover message. The conditional handover message includes a configuration for at least one CHO candidate cell and a configuration for at least one CPAC candidate cell. The configuration for the CHO candidate cell is used for conditional primary cell change; the configuration for the CPAC candidate cell is used for conditional primary secondary cell addition or change and includes an execution condition. A measurement identifier indicated by the execution condition for the CPAC candidate cell is a measurement identifier of a first measurement configuration. The first measurement configuration includes one of the following: an MCG measurement configuration, an SCG measurement configuration, a target MCG measurement configuration, or a target SCG measurement configuration. The measurement identifier is associated with a measurement object and a report configuration.