Conditional PSCell Mobility Execution for Reduced Handover Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handovers, particularly in scenarios requiring robust mobility, such as those involving Conditional Handover (CHO) and Conditional Primary Secondary Cell (PSCell) Addition/Change, due to the need for extensive network signaling and suboptimal execution conditions.
Innovation Solution
A method and apparatus that enable a wireless device to receive conditional configurations for target cells, including configuration parameters for Conditional PSCell Addition (CPA) and Conditional PSCell Change (CPC), allowing selection of appropriate execution conditions based on PSCell configuration, thereby reducing the need for additional network signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate configurations are provided for CPA and CPC, then execution conditions can be optimized for each scenario, but network signaling overhead increases
Solution Approach 1:
The patent applies universality by designing a single conditional configuration structure that can serve both CPA and CPC scenarios. The conditional configuration includes execution conditions that can be interpreted based on the current PSCell configuration state, allowing the same configuration message to function for both adding a new PSCell and changing an existing PSCell, thereby reducing network signaling overhead while maintaining scenario-specific optimization capabilities
Solution Approach 2:
The patent implements dynamics by making the interpretation of execution conditions adaptive based on the PSCell configuration state. The wireless device dynamically selects which execution condition to apply (first execution condition for CPA when PSCell is not configured, second execution condition for CPC when PSCell is configured) based on real-time system state, enabling the same configuration structure to adapt to different operational scenarios
2Productivity
If multiple execution conditions are provided for CPA and CPC, then handover decisions can be optimized, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring both the first execution condition for CPA and the second execution condition for CPC in advance within the conditional configuration. The wireless device receives and stores these execution conditions beforehand, so when handover decisions need to be made, the device can directly evaluate the pre-prepared conditions without complex real-time calculations, improving decision efficiency while managing complexity through advance preparation
3Reliability
If conditional configurations are prepared in advance, then handover can be executed earlier improving mobility robustness, but configuration management complexity increases
Solution Approach 1:
The patent implements preliminary action by enabling the network to prepare and send conditional configurations in advance, including target cell configurations and execution conditions for both CPA and CPC. This allows the wireless device to have handover instructions ready before handover is actually needed, improving mobility robustness by enabling faster response to radio condition changes while the unified configuration structure helps manage the complexity of having multiple conditional scenarios
Data Source
AI summary
A method and apparatus for execution conditions for multiple types of conditional mobility is provided. A wireless device receives a conditional configuration for a target cell from a network. The conditional configuration includes configuration parameters for the target cell, and the configuration parameters include i) a configuration of the target cell, ii) a first execution condition for Conditional Primary Secondary Cell (PSCell) Addition (CPA) and iii) a second execution condition for Conditional PSCell Change (CPC). A wireless device selects one execution condition from the first execution condition and the second execution condition based on whether a PSCell is configured or not, and applies the configuration of the target cell which fulfils the one execution condition.