UE Service Notification During Wireless Handover
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Solution Overview
Problem
There is no method to notify participating users of changes in available services when the state of a User Equipment (UE) changes during a call, such as during handover, leading to unsatisfied user demands as they are not aware of the new service availability.
Innovation Solution
A method and apparatus that updates the available service list for a UE upon a state change and sends this information to other connected UEs, allowing them to compare and notify users of the common available services, ensuring seamless service transitions during state changes like handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If service information exchange is performed only during call setup, then the initial service availability is established, but participating users are not notified of service changes when UE state changes during the call
Solution Approach 1:
The patent applies preliminary action by establishing service information exchange during call setup before the actual service begins. The available service list is determined and exchanged in advance (inclusion/exclusion criteria are set) so that when UE state changes occur during the call, the system can efficiently notify users of service changes without having to perform complete service information exchanges again.
Solution Approach 2:
The patent implements feedback by establishing a mechanism where UE state changes trigger service information re-evaluation and notification. When a UE's state changes (e.g., handover, radio conditions), the system detects this change, re-evaluates the available service list based on pre-established criteria, and notifies participating users of any service availability changes, creating a closed-loop feedback system.
2Loss of information
If service information is exchanged frequently to ensure users are aware of service changes, then user awareness of available services is improved, but signaling overhead and network load increase
Solution Approach 1:
The patent applies local quality by establishing inclusion and exclusion criteria that define specific conditions under which service information should be exchanged. Rather than uniformly exchanging service information in all UE state changes, the system selectively notifies users only when service availability actually changes according to the pre-defined criteria, reducing unnecessary signaling while ensuring relevant information is communicated.
3Measurement precision
If the available service list is updated and compared for each UE state change, then accurate service information is provided to users, but processing time and complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-establishing inclusion and exclusion criteria during call setup that define when service information should be updated and exchanged. This preliminary configuration allows the system to quickly evaluate UE state changes against these pre-defined rules rather than performing complex service information comparisons for every state change, reducing processing time while maintaining accuracy.
Data Source
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AI summary
A method and apparatus for, upon generation of an event triggering a change in the state of a UE participating in a call, sending service information changed due to the state change to the other participating entity and notifying each user of the service information are provided. When a state change event occurs to a UE, the UE checks its available services and sends a message including service information indicating the available services to the other entity connected to the UE. Therefore, the other entity has knowledge of the actual available services of the UE in a changed environment.