Call Disconnection Control for Emergency Terminals
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Solution Overview
Problem
During calls, both the caller and called parties can inadvertently disconnect, leading to delayed rescues and difficulties for elderly users who may hang up calls incorrectly, causing disruptions in emergency situations.
Innovation Solution
A method and terminal implementation that allows only the service controlling party to initiate call disconnections by ignoring local hang-up events and rejecting disconnection messages to the network if the second terminal is on a preset controlled terminal list, ensuring disconnections can only be made by the service controlling party.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If both caller and called parties can initiate disconnection operations, then the ease of operation is improved, but the reliability deteriorates due to accidental hang-ups and inability to prevent wrong disconnections
Solution Approach 1:
The patent applies local quality by differentiating the disconnection control rights between different parties in the call. The controlling party (e.g., emergency service) is granted exclusive disconnection control, while the controlled party (e.g., caller) has restricted control. This asymmetric allocation of control rights resolves the contradiction by maintaining ease of operation for the controlled party to initiate calls while ensuring reliability through restricted disconnection capabilities.
Solution Approach 2:
The patent implements preliminary action by pre-configuring controlled terminal lists and control relationships before calls are established. The network side or controlling party pre-identifies which terminals require protected status, and the system pre-establishes control flags and disconnection restrictions. This allows the system to automatically prevent wrong disconnections without interfering with normal operation, resolving the reliability-ease of operation contradiction.
2Reliability
If the controlled party cannot initiate disconnection, then the reliability is improved by preventing wrong hang-ups, but the ease of operation deteriorates as the controlled party loses full control
Solution Approach 1:
The patent applies dynamics by making disconnection control flexible and context-dependent rather than static. The system dynamically adjusts control rights based on the call type and terminal status. Controlled terminals receive restricted disconnection control during protected calls, but can regain full control when not in protected status. This dynamic approach resolves the contradiction by adapting control levels to specific operational contexts.
Solution Approach 2:
The patent introduces the network side as an intermediary that mediates disconnection control. Rather than directly restricting the controlled party's terminal, the network side receives and processes disconnection requests, applying control rules based on pre-configured terminal lists. This intermediary layer protects against wrong disconnections while maintaining a natural user experience, resolving the contradiction between reliability and ease of operation.
3Reliability
If the system checks controlled terminal lists during disconnection, then the reliability is improved by preventing unauthorized hang-ups, but the device complexity increases due to additional control logic
Solution Approach 1:
The patent extracts the complex control logic from individual terminals and relocates it to the network side. Terminals only need to query their status in a controlled terminal list and follow simple disconnection rules, while the network side handles the complex authorization checks and control flag management. This extraction reduces terminal complexity while maintaining reliability through centralized control validation.
Solution Approach 2:
The patent uses copying by creating simplified control flags and status indicators that replicate the complex authorization state. Instead of implementing full authorization logic in each terminal, the system copies essential control information (control flags, terminal status) to terminals, allowing them to make simple yes/no disconnection decisions based on these copied indicators, thereby reducing complexity while maintaining reliability.
Data Source
AI summary
A method for controlling disconnection during a call, and a terminal are provided. The method used during the call made between a first terminal and a second terminal includes the following steps that: the first terminal detects a hang-up event generated by a hand-up operation of a local user; the first terminal determines whether or not the second terminal is a controlled terminal included in a preset controlled terminal list; and the first terminal ignores the hang-up event and rejects to send a disconnection message to a network side if the second terminal is a controlled terminal included in the preset controlled terminal list.