Voice Data Transmission Single Channel Optimization
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Solution Overview
Problem
In wireless communication systems using carrier sense multiple access with collision avoidance (CSMA/CA), the 'hidden node' problem occurs when a neighboring node cannot transmit due to misinterpretation of channel availability, leading to inefficient use of channel resources, especially when voice data is spread over multiple channels despite a single channel being sufficient.
Innovation Solution
A method where a transmitting node determines whether data is for voice or non-voice communication, and if voice, it transmits over a single channel, while if non-voice, it transmits over multiple channels, ensuring efficient resource utilization by allowing neighboring nodes to use other channels during voice data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voice data is transmitted over multiple channels, then channel diversity and reliability are improved, but channel resource efficiency deteriorates due to unnecessary channel avoidance by neighboring nodes
Solution Approach 1:
The patent applies local quality by differentiating transmission behavior based on data type: voice data is transmitted over a single channel while non-voice data uses multiple channels. This localized adaptation optimizes resource efficiency for voice communications while maintaining the benefits of multi-channel transmission for other data types.
Solution Approach 2:
The patent changes the transmission parameter (number of channels) based on the type of data being transmitted. By dynamically adjusting the channel count from multiple to single based on whether the data is voice or non-voice, the system resolves the contradiction between reliability and resource efficiency.
2Productivity
If voice data is transmitted over a single channel, then channel resource efficiency is improved, but transmission reliability may worsen due to potential channel conflicts
Solution Approach 1:
The patent implements self-service through the NAV mechanism where nodes automatically set avoidance periods based on detected transmissions. When a node transmits voice data on a single channel, other nodes detect this transmission and self-adjust by setting NAV timers to avoid the channel during the transmission period, ensuring reliable delivery without requiring additional redundancy.
3Reliability
If neighboring nodes avoid transmission on all channels during voice communication, then collision avoidance is improved, but overall network productivity deteriorates due to underutilization of available channels
Solution Approach 1:
The patent resolves this contradiction by applying local quality to the channel avoidance mechanism. Instead of avoiding all channels globally, nodes only avoid the specific channel(s) where voice transmission is detected. This allows neighboring nodes to simultaneously transmit non-voice data on other channels, maintaining network throughput while preventing collisions on the active voice channel.
Solution Approach 2:
The patent segments the channel avoidance behavior by data type. Voice traffic triggers channel-specific avoidance through NAV settings, while non-voice traffic does not trigger the same avoidance behavior. This segmentation allows different channels to serve different purposes simultaneously, improving overall network productivity while maintaining collision avoidance for voice communications.
Data Source
AI summary
Disclosed are methods and systems to facilitate use of a single channel for voice communications and of multiple channels for non-voice communications. In particular, a transmitting node may determine that data is to be communicated from the transmitting node to a receiving node and may then make a determination of whether the data is to be communicated as part of a voice communication. If the determination is that the data is not to be communicated as part of a voice communication, then the transmitting node may responsively communicate the data to the receiving node over two or more channels. Whereas, if the determination is that the data is to be communicated as part of a voice communication, then the transmitting node may responsively communicate the data to the receiving node over just one channel rather than communicating the data to the receiving node over two or more channels.