Wireless STA Channel Access via Transmission Ending Moment
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Solution Overview
Problem
In wireless local area networks (WLANs), hidden STAs can cause transmission collisions due to the lack of clear channel access mechanisms, especially when a STA outside the coverage area of another STA transmits simultaneously, leading to interference and data transmission conflicts.
Innovation Solution
A method for a wireless STA to access a channel involves acquiring the transmission ending moment of a wireless frame and not updating its local NAV, then waiting for a specific condition to be met before accessing the channel, such as a preset waiting time or receiving a frame sequence with correctly set NAV, to avoid collisions with hidden STAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a STA drops a PPDU and does not update its local NAV when determining it is not the target receiver, then power consumption is reduced and processing efficiency is improved, but transmission collisions occur with hidden STAs that cannot detect the ACK frame
Solution Approach 1:
The STA performs preliminary actions by acquiring the transmission ending moment of the wireless frame before actually accessing the channel. This allows the STA to time its channel access to occur after the conflicting transmission ends, preventing collisions with hidden STAs while still maintaining power efficiency by not continuously monitoring the channel.
Solution Approach 2:
The transmission ending moment acts as an intermediary parameter that mediates between power saving and collision avoidance. By using this intermediate information, the STA can make informed decisions about when to access the channel without needing to continuously monitor transmissions or maintain NAV updates, thus balancing energy efficiency with reliable transmission.
2Reliability
If a STA continuously monitors the channel and updates NAV for all received frames, then transmission collisions are avoided, but power consumption increases and processing overhead increases
Solution Approach 1:
The STA applies different quality levels of NAV management to different situations. Instead of uniformly updating NAV for all frames, the STA selectively acquires transmission ending moments only when dropping frames to prevent collisions, while maintaining power efficiency by not processing every frame's NAV information. This localized approach optimizes the balance between reliability and energy consumption.
3Productivity
If a STA accesses the channel immediately after dropping a frame, then channel access efficiency is improved, but transmission collisions occur with hidden STAs
Solution Approach 1:
The STA performs preliminary acquisition of the transmission ending moment before accessing the channel. This preliminary action enables the STA to calculate the appropriate waiting period and access the channel at the optimal time - immediately after the conflicting transmission ends - thus maintaining high channel access efficiency while avoiding collisions with hidden STAs.
Solution Approach 2:
The channel access timing is dynamically adjusted based on the acquired transmission ending moment. Instead of using fixed timing or continuous monitoring, the STA dynamically determines when to access the channel by referencing the ending moment of the dropped frame, allowing flexible and efficient channel access that adapts to the actual transmission schedule.
Data Source
AI summary
Provided are a method and system for a wireless STA to access a channel. The method includes that the wireless STA acquires a transmission ending moment of a wireless frame when selecting to refuse or drop the wireless frame and not updating a locally stored Network Allocation Vector (NAV); and the wireless STA accesses the channel when the transmission of the wireless frame is ended and a preset condition is met. According to the disclosure, a collision problem may happen to the wireless STA, and the wireless STA can access the channel only when the preset condition is determined to be met after the transmission of the wireless frame is ended, so that the problem of transmission collision with a hidden STA during the wireless frame transmission of the wireless STA is solved.