Mobile Station Emergency Call Prefix Segmentation
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Solution Overview
Problem
Emergency calls with added prefixes are often treated as general calls, failing to break through access control or prioritize emergency call handling.
Innovation Solution
A mobile communication system and method that separates calling number information into a prefix and a number, allowing the mobile station to transmit emergency calls as such, with a call control device identifying the prefix to determine the appropriate treatment and connection to emergency call answering points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station treats calls with prefixes as general calls to protect personal information, then the called party notification control is achieved, but the emergency call priority and access control bypass are lost
Solution Approach 1:
The calling number information is segmented into two parts: a prefix indicating notification preference and a main calling number. The mobile station extracts and transmits both parts separately in the Emergency Setup message, allowing the network to identify emergency calls even when prefixes are present, while still enabling the called party notification control function.
Solution Approach 2:
The prefix acts as an intermediary element that carries dual information: it indicates the caller's notification preference to the network while also serving as part of the complete calling number identification. The network uses this intermediary prefix to distinguish emergency calls from general calls without compromising the caller's privacy preferences.
2Reliability
If the Emergency Setup message does not include calling number information, then personal information protection is simplified, but the ability to notify called parties of emergency call numbers is lost
Solution Approach 1:
The caller's notification preference is determined in advance through the prefix selection before the emergency call is placed. This preliminary action allows the system to prepare the appropriate notification handling in advance, ensuring that calling number information is only transmitted when the caller has pre-indicated consent through the prefix.
3Ease of operation
If emergency calls with prefixes are treated as general calls, then calling number notification control is maintained, but access control bypass and priority control fail
Solution Approach 1:
The solution adds a new dimension to the Emergency Setup message by including both the prefix and the main calling number in separate information elements. This dimensional expansion allows the message to carry both notification preference information and complete calling number information simultaneously, enabling the network to provide both notification control and emergency call priority handling.
Data Source
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AI summary
The invention provides a mobile communication system, a mobile station, a call control device, and a mobile communication method that are capable of allowing an emergency call, even to which a prefix indicating how to treat the emergency call is added, to break through access control, and applying priority control to the emergency call, as in the case of a normal emergency call without the addition of the prefix. UE (100) separates acquired calling number information into a prefix and a calling number, and sends an MSC (210) an Emergency Setup which includes the prefix and an Emergency Category linked with the calling number. The MSC (210) determines how to treat the emergency call (such as to block notification of a telephone number of a calling party) based on the prefix included in the Emergency Setup, and connects the emergency call to a PSAP (400) corresponding to the Emergency Category.