Mobile Device Automatic Redial for Failed Emergency Calls
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Solution Overview
Problem
Mobile phone users face failed calls due to lack of service or radio frequency coverage, especially during emergency situations, where they cannot reinitiate calls to seek assistance.
Innovation Solution
A method and system for automatically retrying failed calls from mobile devices, which includes storing dialed numbers, determining if they are emergency numbers, and enabling automatic redialing with an emergency or non-emergency retry service, along with message recording and playback features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic redialing is implemented for failed calls, then call reconnection capability is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by detecting call failure conditions and automatically initiating redial sequences without requiring user intervention. The mobile device monitors call status, identifies failed calls, and triggers automatic redialing based on pre-configured parameters such as retry intervals and maximum attempt limits.
Solution Approach 2:
The automatic redial system enables the mobile device to serve itself by autonomously detecting call failures, determining retry parameters, and executing redial operations without external assistance. The system manages its own call reconnection process through integrated detection and control mechanisms.
2Reliability
If emergency call retry service is implemented, then emergency assistance access is improved, but loss of time for service configuration increases
Solution Approach 1:
The emergency call retry service is pre-configured and activated automatically when emergency calls fail, eliminating the need for time-consuming service configuration during critical moments. The system detects emergency call failures and immediately initiates retry sequences using pre-established parameters.
Solution Approach 2:
The system applies different retry service qualities to different call types: emergency calls receive immediate, aggressive retry attempts with higher priority, while non-emergency calls use more conservative retry parameters. This localized quality differentiation ensures optimal response for critical emergency situations.
3Reliability
If multiple retry attempts are made for failed calls, then call connection reliability is improved, but use of energy increases
Solution Approach 1:
The system employs periodic retry actions with strategically determined intervals between attempts. Rather than continuous retrying, the mobile device waits for specified time periods between redial attempts, allowing network conditions to potentially improve while minimizing energy consumption during idle intervals.
Solution Approach 2:
The system performs a limited number of retry attempts rather than exhaustive continuous retrying. By setting maximum retry limits and stopping after a predetermined number of attempts, the system achieves sufficient call reconnection reliability without excessive energy expenditure on futile retry cycles.
Data Source
AI summary
A mobile device and method in one example for automatically redialing a dialed number when a call has failed is provided. The mobile device stores the dialed number when the call is initially being placed. If the call fails, the mobile device determines if a call retry service should be invoked. If so, the mobile device determines whether a call retry system has already been enabled. If the call retry system has been enabled, the mobile device will continually and automatically call the dialed number until a terminating party at the dialed number answers or a selectable time limit has expired. When the terminating party answers the call, the mobile device rings so that a subscriber of the mobile device may answer the ring and connect the call. The mobile device may also detect if the dialed number is an emergency number or non-emergency number. A recorded message recorded by the subscriber may be automatically played to the terminating party if the subscriber does not answer the ring. Alternatively, or in addition to, a default recorded message may be played to the terminating party if the subscriber does not answer the ring.