Conditional Handover Configuration Validity in 5G Wireless Terminals
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Solution Overview
Problem
Current conditional handover mechanisms in wireless communication systems, particularly in 5G NR networks, lack efficient and secure configurations for managing handovers between cells, leading to potential reliability and robustness issues.
Innovation Solution
A wireless terminal and access node system that receives and processes conditional handover configurations, including identity of candidate target cells and triggering conditions, to autonomously perform handovers while ensuring security configurations, allowing for periodic measurement reporting and validity checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover configurations are provided without validity indicators, then the handover configuration process is simpler, but the reliability and security of handover configurations deteriorates
Solution Approach 1:
The patent applies preliminary action by including validity indicator information in the conditional handover configuration message before the handover is executed. This allows the wireless terminal to pre-determine whether to apply the configuration, preventing unreliable configurations from being used while maintaining a relatively simple message structure.
Solution Approach 2:
The validity indicator acts as an intermediary element between the network device and wireless terminal. It provides a simple binary signal that mediates the complexity of full configuration validation, allowing the terminal to quickly determine configuration applicability without processing complex validation logic.
2Reliability
If full configuration is provided for all conditional handovers, then the security and completeness of configuration is improved, but the signaling overhead and resource utilization deteriorates
Solution Approach 1:
The patent applies local quality by providing different configuration types (full configuration versus configuration with validity indicator) based on local conditions. When configurations are likely to be valid, only validity indicators are transmitted. Full configurations are provided only when necessary, optimizing the balance between completeness and signaling overhead.
Solution Approach 2:
The patent uses partial action by transmitting only validity indicators rather than complete configuration messages in cases where full configuration is not needed. This reduces signaling overhead significantly while maintaining sufficient configuration information for handover execution when conditions are favorable.
3Speed
If wireless terminal autonomously determines configuration validity, then the handover execution speed is improved, but the risk of incorrect configuration application increases
Solution Approach 1:
The patent implements feedback by having the network device provide validity indicator information that guides the terminal's autonomous determination process. The terminal uses this feedback signal to confirm whether configurations should be applied, combining fast autonomous decision-making with network-guided accuracy verification.
Data Source
AI summary
A wireless terminal comprises receiver circuitry and processor circuitry. The receiver circuitry is configured to receive a message. The message comprises one or more conditional handover configurations; at least one indication; and, at least one triggering condition; each of the one or more conditional handover configurations comprising at least one identity of a candidate target cell, the at least one indication indicating whether or not the message is provided as full configuration. The processor circuitry is configured to: store the one or more conditional handover configurations and the at least one indication; perform a handover to a target cell; and determine validity of the one or more conditional handover configurations based on the indication upon or after performing the handover.