NGV PPDU Transmission with Channel State Check
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Solution Overview
Problem
In wireless LAN systems, particularly in multi-frame transmission modes, collisions between frames occur frequently, leading to inefficiencies and reduced performance, especially in Next Generation V2X (NGV) standards like 802.11bd, which use the 5.9 GHz band for Dedicated Short Range Communication (DSRC).
Innovation Solution
A method where a transmitting STA transmits a first NGV PPDU and then checks the channel state before transmitting a second NGV PPDU, deciding whether to proceed based on the channel state to avoid collisions, utilizing a frequency spacing of 156.25 kHz in the 5.9 GHz band for multi-frame transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-frame transmission is performed in NGV standard, then throughput is improved, but frame collisions occur frequently
Solution Approach 1:
The patent applies preliminary action by having the transmitting STA check the channel state before transmitting each frame in the multi-frame transmission sequence. Specifically, before transmitting the second NGV PPDU, the STA identifies the channel state and determines whether to proceed based on this identification, preventing collisions before they occur
Solution Approach 2:
The patent implements feedback by having the transmitting STA continuously monitor and identify the channel state during multi-frame transmission and use this information to determine whether to transmit the next frame. This feedback mechanism allows the system to adapt to changing channel conditions and avoid collisions
2Reliability
If channel state checking is performed before each transmission, then frame collisions are reduced, but transmission time is increased
Solution Approach 1:
The patent applies partial action by performing channel state checking only before transmitting frames that may collide, rather than continuously monitoring throughout the entire transmission process. The STA checks the channel state before the second NGV PPDU transmission and determines whether to proceed based on this specific check, avoiding unnecessary time consumption while still preventing collisions
Data Source
AI summary
One embodiment according to the present specification relates to a technique for multiple frame transmission in a wireless LAN (WLAN) system. A transmission STA can transmit a first next generation V2X physical protocol data unit (NGV PPDU) from among a plurality of NGV PPDUs for a multiple frame transmission mode. Afterwards, the transmission STA can identify a channel state for the transmission of a second NGV PPDU from among the plurality of NGV PPDUs. The transmission STA can determine, on the basis of the channel state, whether to transmit the second NGV PPDU.