Guard Timer for Rapid IMS Registration on Alternative Networks

The patent applies preliminary action by pre-configuring a maximum retry count parameter in the UE before the IMS registration process begins. This allows the device to have a predetermined limit on retry attempts, preventing indefinite retry loops while ensuring adequate attempt coverage for reliable registration. The UE can quickly determine when to switch to alternate RAN based on this pre-set criterion, resolving the contradiction between reliability and time by establishing a clear stopping condition.

The patent implements dynamics by making the retry behavior adaptive rather than static. The UE dynamically adjusts its registration strategy based on the outcome of each retry attempt, using the maximum retry count as a dynamic threshold. When the retry count reaches this threshold, the system automatically transitions from persistent retrying to switching access networks, creating a flexible response that balances connection stability attempts with user experience protection.

The patent applies parameter changes by modifying the retry count parameter to a specific maximum value that optimizes the balance between accuracy and speed. This parameter adjustment allows the UE to perform sufficient retry attempts to accurately determine WiFi availability while preventing excessive delays. By tuning this parameter, the system achieves both accurate network selection and acceptable registration completion time.