UE IMS Registration Continuity Across Radio Access Technologies
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Solution Overview
Problem
In wireless telecommunication networks, particularly with the LTE standard, the transition across different Radio Access Technologies (RATs) can lead to IMS registration challenges, resulting in service disruptions, delays, and resource wastage due to potential race conditions and 'rogue UE' issues when re-registering with a high-priority RAT after an unsuccessful registration attempt on a lower-priority RAT.
Innovation Solution
A method where a user equipment (UE) connected to a first network using a first RAT attempts registration with a second RAT's IMS, determines the registration failure, clears authorization information, and then reconnects to the first network for a second registration attempt without previous authorization data, avoiding 'forbidden' responses and ensuring seamless service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE attempts to register with a second network after being registered with a first network, then the UE can access services on the second network, but the registration may fail due to race conditions and 'rogue UE' issues causing service disruptions
Solution Approach 1:
The patent applies preliminary action by having the UE clear authorization information before attempting registration on a second network. This preparatory step prevents the UE from attempting to use invalid or outdated authorization data, thereby preventing registration failures and service disruptions while maintaining the ability to switch between networks.
2Speed
If the UE retains authorization information from a previous network registration, then the registration process can be faster, but it causes 'forbidden' responses and registration delays when switching networks
Solution Approach 1:
The patent applies preliminary action by having the UE clear authorization information before attempting registration on a second network. This preparatory step prevents the UE from attempting to use invalid or outdated authorization data, thereby preventing registration failures and service disruptions while maintaining the ability to switch between networks.
3Reliability
If the UE continuously attempts registration on different networks, then service continuity can be maintained, but it increases signaling load and wastes network resources
Solution Approach 1:
The patent applies preliminary action by having the UE clear authorization information before attempting registration on a second network. This preparatory step prevents the UE from attempting to use invalid or outdated authorization data, thereby preventing registration failures and service disruptions while maintaining the ability to switch between networks.
Data Source
AI summary
Described herein are apparatus, systems and methods for enhancing Internet protocol (“IP”) multimedia subsystem service continuity. The methods including, at a user equipment (“UE”) connected to a first network using a first Radio Access Technology (“RAT”) and authorization information, connecting to a second network using a second RAT, transmitting a first registration attempt to an IP multimedia subsystem (“IMS”) associated with the second network, determining that the registration attempt with the IMS associated with the second network did not complete, clearing the authorization information, reconnecting to the first network and transmitting a second registration attempt to the IMS associated with the first network without the authorization information.