Terminal Adaptor Emergency Registration Status Handling
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Solution Overview
Problem
In GSM and UMTS systems, mobile stations attached for emergency bearer services cannot activate PDP contexts for normal services, leading to radio modem busy conditions and unclear registration status, as applications cannot distinguish between emergency and normal attachments, causing unnecessary detach and attach procedures.
Innovation Solution
A method where a terminal adaptor in the mobile station indicates a distinct registration status for emergency bearer services to the terminal equipment, using specific codes like +CGREG: 6 or +CEREG: 6, to differentiate it from normal services, preventing unnecessary PDP context activation and radio modem busy conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station is attached for emergency bearer services, then emergency communication is enabled, but the radio modem becomes busy and normal PDP context activation is blocked
Solution Approach 1:
The patent segments the registration status into distinct types: emergency bearer service attachment and normal service attachment. By introducing a specific registration status code (e.g., +CGREG: 6 or +CEREG: 6) that differentiates emergency attachment from normal attachment, the system allows the terminal equipment to recognize and handle emergency services without mistakenly attempting to activate normal PDP contexts, thus resolving the conflict between emergency service availability and normal service activation.
2Loss of information
If the application queries registration status, then the mobile station responds with registered status, but the application cannot distinguish between emergency and normal attachments
Solution Approach 1:
The patent applies local quality by providing different levels of information detail in the registration status response. Instead of a single generic 'registered' status, the system introduces a specific status code (e.g., +CGREG: 6 or +CEREG: 6) that locally enhances the information quality at the point of query, allowing the application to precisely identify whether the attachment is for emergency or normal services.
3Duration of action of stationary object
If the mobile station continuously maintains emergency bearer service attachment, then emergency services remain available, but unnecessary detach and attach procedures occur
Solution Approach 1:
The patent implements feedback by continuously providing accurate registration status information to the terminal equipment. When the mobile station is attached for emergency bearer services, the specific status code (e.g., +CGREG: 6 or +CEREG: 6) is returned in response to application queries. This feedback mechanism prevents the terminal equipment from initiating unnecessary detach and attach procedures, as it can accurately determine the current attachment state and avoid redundant operations, thereby reducing time loss while maintaining service continuity.
Data Source
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AI summary
A method of handling an emergency bearer service for a mobile station is disclosed. The mobile station comprises a terminal adaptor and a terminal equipment. The method comprises the terminal adaptor indicating a first registration status for an emergency bearer service to the terminal equipment of the mobile station.