Emergency Call Speech Data Synchronization via DTMF Position
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Solution Overview
Problem
Existing emergency call systems face challenges in synchronizing speech and data channels, particularly when the Mobile Subscriber Integrated Services Digital Network Number (MSISDN) cannot be determined, leading to potential service quality issues and inefficiencies, especially during international roaming and data protection concerns.
Innovation Solution
The method involves transmitting geographical position information via both the data and speech channels, using DTMF tones or alternative modulation, ensuring redundant transmission and decoding at the service center, allowing for unambiguous identification and synchronization even if the data channel is defective, and utilizing either the mobile terminal device or base station to determine and send position coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MSISDN is used to synchronize data and speech channels, then synchronization can be achieved when available, but service quality deteriorates when MSISDN cannot be determined (e.g., during international roaming or due to data protection concerns)
Solution Approach 1:
The patent introduces position information as an intermediary element to synchronize data and speech channels when MSISDN is unavailable. Instead of directly using MSISDN for identification and synchronization, the system uses position data (coordinates) as a mediator that can be reliably obtained through GPS or base station triangulation, thereby maintaining service availability in scenarios where MSISDN cannot be determined.
Solution Approach 2:
The patent changes the identification parameter from MSISDN (telecom number) to position information (geographical coordinates). This parameter change allows the system to function in international roaming scenarios and situations where CLIR (Calling Line Identification Restriction) is activated, as position data can be obtained independently of the caller's telephone number or subscription details.
2Reliability
If position information is transmitted via speech channel using DTMF tones, then redundant transmission is achieved improving reliability, but transmission time increases at the beginning of the speech call
Solution Approach 1:
The patent applies preliminary action by transmitting position information via DTMF tones at the very beginning of the speech call, during the initial connection phase. This ensures that the redundant position data is delivered before the main conversation starts, minimizing the impact on usable call time. The system prepares and sends the position data in advance during the call setup phase.
Solution Approach 2:
The patent uses DTMF tones as a temporary, disposable transmission medium for position information. DTMF tones are simple acoustic signals that can be quickly generated and transmitted without requiring persistent connection or complex protocols. This lightweight approach provides redundant transmission capability while minimizing time consumption, as the tones are sent briefly at call start and then discarded.
3Reliability
If position information is transmitted via both data and speech channels, then synchronization reliability is improved, but system complexity increases
Solution Approach 1:
The patent makes the position information transmission system universal by designing it to work through multiple channels (data channel and speech channel) and multiple methods (direct data transmission and DTMF tone transmission). This multi-functionality allows the same position data to be transmitted through different pathways, providing redundancy without requiring separate specialized systems for each channel. The service center can receive and process position information regardless of which channel is used.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures reliable synchronization of data and speech for location-related services, enhancing service quality by providing redundant location information transmission, which can be processed even if the data channel fails, and is applicable to both call center-supported and automated services.
Implementation Method 1
the position (geographical latitude and longitude) of the mobile terminal device is transmitted, for example, in the form of DTMF (Dual Tone Multiple Frequency) tones, to the service center
Implementation Method 2
in the service center, the DTMF—Dual Tone Multi Frequency—tones are decoded and converted into the position
Data Source
AI summary
A method, system, and device are provided for transmitting emergency calls by means of a mobile device via a speech channel and a data channel. The data channel serves to transmit location information. The location information may be transmitted in encoded form. The information also may be transmitted via the speech channel. The information may then be compared for consistency in the service center.