Mobile Device Hearing Impaired Call Setup Failure Resolution
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Solution Overview
Problem
Mobile communication devices and networks face challenges in providing reliable TTY functionality for hearing impaired individuals, often resulting in call setup failures and poor voice quality due to the selection of high voice quality codecs that do not support text transmission, leading to high character error rates.
Innovation Solution
The implementation of a mobile communication device that indicates a voice call as hearing impaired and provides a hearing impaired codec list to the mobile cellular network, allowing for the selection of appropriate codecs that support text transmission, and dynamically switching to alternative codecs if high character error rates are detected, thereby improving call setup success rates and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high voice quality codecs are selected for voice calls, then voice quality is improved, but text transmission capability deteriorates leading to high character error rates
Solution Approach 1:
The system dynamically switches between different voice codecs based on the type of call. For hearing impaired calls, it selects codecs from a specialized list (e.g., GSM FR, GSM HR, AMR) that support text transmission, while for regular calls it uses high-quality codecs (e.g., WB-AMR, EVS). This dynamic adaptation resolves the contradiction by choosing the appropriate codec for each call type.
Solution Approach 2:
The system changes the codec parameter based on call type identification. When a hearing impaired call is detected, the system modifies the codec selection parameter to use TTY-compatible codecs, thereby reducing character error rates while maintaining acceptable voice quality for this specific user group.
2Reliability
If a hearing impaired call is identified and a specialized codec list is provided to the network, then call setup reliability is improved, but device complexity increases
Solution Approach 1:
The system pre-configures a dedicated hearing impaired codec list containing TTY-compatible codecs. When a hearing impaired call is identified, the system already has the appropriate codec list ready and can quickly provide it to the network without complex real-time analysis, thereby improving call setup reliability with minimal added complexity.
Solution Approach 2:
Instead of creating entirely new codec handling mechanisms, the system copies and adapts existing codec frameworks. It uses the standard codec negotiation protocols but provides a specialized subset of codecs (the hearing impaired list) that are known to work reliably for TTY calls, simplifying the implementation while improving reliability.
Data Source
AI summary
A mobile communication device, a method of establishing a mobile telephone voice call and an apparatus are provided herein. In one embodiment, the mobile communication device includes: 1) a processor configured to indicate a voice call employing the mobile communication device is a hearing impaired call and (3) a modem configured to initiate establishment of the hearing impaired call with a mobile cellular network, wherein the establishment includes providing a hearing impaired codec list to the mobile cellular network.