Primary Secondary Channel Segmentation for Vehicle WLAN Throughput
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Solution Overview
Problem
In vehicle wireless local area networks (WLANs), the lack of a clear concept and configuration method for a primary channel hinders efficient channel access and data transmission, particularly in outside context of BSS (OCB) communication networks without a wireless access point.
Innovation Solution
A method is introduced to configure and extend the bandwidth of a primary channel by defining channel access and utilizing a secondary channel, enabling efficient multi-user packet transmission through random backoff operations and channel sensing, ensuring fair access and extended bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a primary channel is defined and extended using a secondary channel in vehicle WLANs, then data throughput and transmission distance are improved, but channel access complexity and device configuration complexity increase
Solution Approach 1:
The channel is segmented into a primary channel (10 MHz) and a secondary channel (10 MHz). The primary channel is used for basic channel access and control, while the secondary channel is conditionally activated to extend bandwidth. This segmentation allows the system to achieve higher throughput when needed while maintaining simple operation when the secondary channel is not used, thus resolving the contradiction between throughput improvement and complexity increase.
2Length of stationary object
If channel extension using secondary channel is implemented, then transmission distance is improved, but ease of operation deteriorates due to complex monitoring and backoff procedures
Solution Approach 1:
The system dynamically adapts between single-channel mode and extended-channel mode based on transmission requirements. When transmission distance needs to be extended, the secondary channel is activated; when simple communication is sufficient, only the primary channel is used. This dynamic operation resolves the contradiction by making the complex extended mode available only when necessary, while maintaining simple operation for basic cases.
3Quantity of substance
If multi-user packet transmission is enabled through extended channel, then network capacity is improved, but device complexity increases due to multiple channel monitoring requirements
Solution Approach 1:
The channel access mechanism is segmented into primary channel monitoring (mandatory for all users) and secondary channel monitoring (optional for extended bandwidth). This segmentation allows the system to support multi-user packet transmission by enabling secondary channel monitoring only for devices that need extended bandwidth, thus increasing network capacity while limiting the complexity increase to only those devices that require it.
Data Source
AI summary
An operating method of a first communication node in a wireless communication network may include steps of: performing a monitoring operation on a first channel and a second channel; when states of the first channel and the second channel are idle states during a first section as a result of the monitoring operation, performing a random back-off operation in the first channel and the second channel; and when the state of the first channel and the state of the second channel are the idle states as a result of the random back-off operation, transmitting a first frame from the first channel and the second channel.