Vehicle Hands-Free Wireless LAN Speech Data Communication
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Solution Overview
Problem
Conventional hands-free phone conversations in vehicles using wireless LANs face significant speech data delay issues due to asynchronous data communication systems, which can lead to poor speech transmission quality and annoyance, as they require postponing speech data transmission until other terminals have completed their communication, resulting in maximum waiting times of approximately 65 ms.
Innovation Solution
An asynchronous speech data communication system that includes a communication control section to limit the packet size of data from other devices and prioritize polling of the speech communication terminal, reducing waiting times and maintaining speech transmission quality by ensuring speech data can be transmitted within a fixed delay time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless LAN is used for speech data transmission, then data communication capability is improved, but speech data delay increases due to asynchronous communication protocol
Solution Approach 1:
The system dynamically adjusts the packet size of non-speech data based on current network conditions and speech traffic load. When speech data is detected, the access point limits the packet size of other data transmissions to reduce waiting time, creating a dynamic adaptation mechanism that resolves the contradiction between data communication capability and speech data delay.
2Productivity
If large packet size is used for data transmission, then data transmission efficiency is improved, but waiting time for speech data transmission increases
Solution Approach 1:
The system changes the packet size parameter dynamically based on traffic type. When speech data is detected in the network, the access point limits the packet size of non-speech data to a smaller value, reducing the waiting time for speech data transmission. This parameter adjustment resolves the contradiction by allowing large packets for general data efficiency while using smaller packets during speech transmission to minimize delay.
3Productivity
If multiple terminals communicate simultaneously, then network utilization is improved, but speech data transmission delay increases due to collision avoidance protocol
Solution Approach 1:
The access point implements a feedback mechanism that monitors the type of data being transmitted by each terminal. When speech data is detected from any terminal, the access point provides feedback to limit the packet size of other terminals' transmissions, creating a controlled environment that prioritizes speech data and reduces waiting time while maintaining network utilization.
Data Source
AI summary
An asynchronous speech data communication system, which is capable of making a hands-free phone conversation at a high speed without causing annoyance in a vehicle, and a communication method therefor are provided. A vehicle-mounted hands-free system includes a speech communication terminal having a speech data communication function, an access point for enabling communication using an asynchronous wireless LAN with other electronic devices, such as a PDA and a mobile audio, including the speech communication terminal, and a communication control section for limiting the packet size of data to be communicated of the other electronic devices when there is communication of speech data by the speech communication terminal.