Access Terminal Silence-Frame Rate Control for Vocoder Mute Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, access terminals face challenges in preventing vocoders from entering a mute state during silence intervals, which can lead to call drops due to insufficient transmission of silence frames, as the threshold rates for vocoders vary and it is difficult to determine when a vocoder has ceased transmitting audio data.
Innovation Solution
An access terminal dynamically increases the silence-frame rate to reduce the duration of transmission absence below the threshold time interval, ensuring continuous audio data transmission by monitoring the vocoder's activity and adjusting the silence-frame rate to prevent the vocoder from entering a mute state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the access terminal uses discontinuous transmission during silence intervals, then bandwidth consumption is reduced, but the vocoder may enter a mute state causing call drops
Solution Approach 1:
The access terminal dynamically adjusts the silence-frame rate based on real-time vocoder activity monitoring. When the vocoder shows signs of entering mute state, the terminal increases the transmission frequency of silence frames to prevent call drops, while maintaining lower transmission rates during stable silence periods to conserve bandwidth.
Solution Approach 2:
The system implements feedback control by continuously monitoring vocoder activity status and using this information to adjust the silence-frame rate. The access terminal detects when the vocoder has ceased transmitting audio data and responds by increasing transmission frequency to prevent the vocoder from entering mute state.
2Device complexity
If the access terminal transmits silence frames at a fixed rate, then the transmission pattern is simple, but it cannot adapt to varying vocoder thresholds causing call drops
Solution Approach 1:
The access terminal transitions from fixed-rate transmission to dynamic transmission by continuously monitoring vocoder activity and adjusting the silence-frame rate in real-time. This allows the system to adapt to varying vocoder thresholds and prevent call drops without requiring complex manual configuration.
Solution Approach 2:
The access terminal autonomously monitors its own transmission effectiveness by detecting vocoder activity status and automatically adjusts its transmission strategy. The system serves itself by using the vocoder's own behavior (whether it has ceased transmitting audio data) as feedback to control its own transmission rate.
3Reliability
If the access terminal increases the silence-frame rate to prevent vocoder mute state, then call continuity is improved, but bandwidth consumption increases
Solution Approach 1:
The system dynamically adjusts the silence-frame rate based on real-time conditions. During periods when the vocoder is stable and not approaching mute state, the terminal uses lower transmission rates to conserve bandwidth. When the vocoder shows signs of entering mute state, the terminal temporarily increases the transmission rate to prevent call drops.
Solution Approach 2:
The access terminal changes the transmission parameter (silence-frame rate) based on the vocoder's operational state. By monitoring whether the vocoder has ceased transmitting audio data, the terminal adjusts the frame rate parameter accordingly, increasing it only when necessary to prevent mute state while maintaining lower rates during normal operation.
Data Source
AI summary
A method and system is disclosed for control of discontinuous transmission based on vocoder and voice activity. An access terminal (AT) may engage in a communication session via an encoder-decoder in a network device in a wireless network. During silence intervals of the communication session, when the AT has no data to transmit, the AT may transmit periodic silence frames at a silence-frame rate to the encoder-decoder. The silence frames may contain parameters for generation of audio noise by the network device. Upon determining that the encoder-decoder has ceased transmitting data to the AT in response to a prolonged absence of transmissions from the AT, the AT may increase the silence-frame rate so as to reduce the duration of the absence of transmissions from the AT, and correspondingly cause the encoder-decoder to begin transmitting audio data to the AT.