Wireless Channel Expansion With Fallback Access for Fair Frame Transmission
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Solution Overview
Problem
The existing wireless LAN standards for vehicle communication networks, such as IEEE 802.11p and IEEE 802.11bd, lack a clear definition of a primary channel and channel access method, which hinders efficient frame transmission and data throughput.
Innovation Solution
A method is introduced to configure a primary channel by extending the bandwidth of a 10 MHz channel to 20 MHz, utilizing channel occupancy ratios and random backoff operations to perform efficient channel access in an outside context of BSS communication, allowing fallback transmission when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the bandwidth of the primary channel is extended from 10 MHz to 20 MHz to increase data throughput, then the data throughput and transmission distance are improved, but the channel access complexity and difficulty of detecting channel state increase
Solution Approach 1:
The 20 MHz extended channel is segmented into a primary channel and a secondary channel. The primary channel (10 MHz) maintains backward compatibility with legacy terminals, while the secondary channel (10 MHz) provides additional bandwidth for extended data transmission. This segmentation allows the system to achieve higher throughput without complicating the basic channel access mechanism for all terminals.
Solution Approach 2:
The patent implements preliminary channel sensing and occupancy ratio measurement before attempting frame transmission. The communication node measures the channel occupancy ratio of both the primary and secondary channels in advance, and performs random backoff operations based on these measurements. This preliminary action prevents transmission conflicts and simplifies the overall access process by resolving channel contention before transmission begins.
2Reliability
If channel occupancy ratio measurement and random backoff operations are implemented for extended channel access, then channel access fairness is improved, but the time required for channel access increases
Solution Approach 1:
The patent dynamically adjusts the random backoff parameter based on the measured channel occupancy ratio. When the channel occupancy ratio is low, a smaller backoff range is used, reducing access time. When the occupancy ratio is high, a larger backoff range is applied to ensure fairness. This parameter adaptation allows the system to balance fairness and access time based on actual channel conditions.
3Reliability
If fallback transmission mechanism is implemented for extended channels, then transmission reliability is improved, but the device complexity increases
Solution Approach 1:
The patent implements a fallback transmission mechanism where the communication node first attempts to transmit frames using the extended 20 MHz channel (primary + secondary channels). If the transmission fails or the channel is occupied, the system automatically falls back to using only the primary 10 MHz channel. This beforehand cushioning ensures that legacy terminals can always receive transmissions on the primary channel, maintaining reliability without requiring complex modifications to all system components.
Data Source
AI summary
A method for operating a first communication node in a wireless communication network may comprise: a step for measuring the channel busy ratio of a first channel; a step for allowing fallback transmission of a first frame in the first channel on the basis of information about the channel busy ratio of the first channel; a step for performing a channel sensing operation in the first channel and a second channel; and a step for performing fallback transmission of the first frame in the first channel when, as a result of the channel sensing operation, the state of the first channel is an idle state and the state of the second channel is a busy state.