Wi-Fi Data Transmission Preemption to Reduce Channel-Access Delay
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Solution Overview
Problem
Interference between Wi-Fi devices causes conflicts in sharing radio frequency air interface resources, leading to prolonged data transmission delays and packet loss.
Innovation Solution
A method involving a transmit device sending a preemption frame with first indication information to determine a silent duration, followed by sending a data frame when the channel is idle for a preset time period, ensuring timely data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple Wi-Fi devices share radio frequency air interface resources according to protocol, then resource sharing is achieved, but data transmission delay increases and packet loss occurs
Solution Approach 1:
The patent applies preliminary action by sending a preemption frame before the actual data frame to reserve the channel in advance. The preemption frame includes duration information that causes other devices to remain silent for a specified period, ensuring the channel is free when the data transmission needs to occur, thus reducing transmission delay while maintaining resource sharing capability
2Ease of operation
If Wi-Fi devices follow protocol-based channel access, then fair resource allocation is achieved, but data transmission timeliness deteriorates
Solution Approach 1:
The patent segments the channel access process into two distinct phases: a preemption phase using a preemption frame to quickly secure the channel, and a data transmission phase. This segmentation allows the system to maintain fair resource allocation through protocol while introducing a fast-track mechanism that divides the access process to achieve timely data transmission
3Productivity
If devices preempt radio frequency air interface resources simultaneously, then resource utilization improves, but channel conflicts increase
Solution Approach 1:
The patent introduces a preemption frame as an intermediary element that mediates channel access between multiple devices. This intermediary carries duration information that coordinates the silent periods of different devices, allowing them to preempt resources simultaneously without conflict, thus improving resource utilization while maintaining reliability
Data Source
AI summary
This application provides a data transmission method and an apparatus, and may be applied to a wireless local area network system that supports 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax, for example, 802.11be, Wi-Fi 7, or EHT, and a next-generation protocol of 802.11be or Wi-Fi 8. According to the method, before a transmit device sends a to-be-sent data frame, the transmit device first sends a preemption frame, where the preemption frame includes first indication information used to determine first duration. After the transmit device sends the preemption frame, if a time period for which a channel keeps idle reaches a preset time period, the transmit device sends the to-be-sent data frame.