Restricted TWT Operation in OBSS Environment
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Solution Overview
Problem
In wireless LAN systems, particularly in OBSS environments, supporting traffic sensitive to time delay is challenging due to lower transmission speeds and interference, making it difficult for Wi-Fi to guarantee low-latency data transmission without channel monopolization by a central base station.
Innovation Solution
Implementing a restricted TWT operation where the more data field of the last transmitted data before the start time of the restricted TWT SP is set to zero, allowing STAs to transmit and receive data regardless of OBSS NAV, ensuring predictable and low-latency data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Wi-Fi operates in OBSS environment without channel monopolization, then network sharing and flexibility are improved, but transmission speed decreases and interference increases
Solution Approach 1:
The patent applies preliminary action by setting the More Data field to 0 in the last transmitted data frame before the restricted TWT SP start time. This preliminary configuration prevents OBSS NAV from being set, ensuring that the STA can access the channel without delay at the predetermined TWT time, thus maintaining transmission speed while allowing network sharing.
2Adaptability or versatility
If Wi-Fi operates in OBSS environment without channel monopolization, then network sharing is improved, but interference from surroundings increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the More Data field to 0 before the TWT SP starts. This prevents other STAs from setting their OBSS NAV based on the current STA's transmission, thereby preemptively eliminating the harmful effect of interference and ensuring clean channel access for time-sensitive data.
3Reliability
If OBSS NAV is set during restricted TWT SP, then channel protection is improved, but data transmission for time-sensitive traffic is blocked
Solution Approach 1:
The patent applies local quality by creating an exception for the current STA within the OBSS NAV mechanism. By setting the More Data field to 0, the current STA's transmissions do not trigger OBSS NAV in other STAs, allowing the current STA to maintain reliable channel protection while other STAs can still access the channel for their own transmissions, thus avoiding time loss for time-sensitive traffic.
4Object-affected harmful factors
If channel access is restricted by OBSS NAV, then interference protection is improved, but low-latency data transmission is prevented
Solution Approach 1:
The patent applies preliminary action by configuring the More Data field to 0 before the TWT SP begins. This preliminary setting ensures that the current STA's frames do not cause OBSS NAV to be set in other STAs, thereby maintaining interference protection through NAV while simultaneously ensuring that the current STA can transmit time-sensitive data without latency during its restricted TWT SP.
Data Source
AI summary
The present specification proposes a restricted TWP operation applicable in an OBSS environment. According to an embodiment described in the present specification, a restricted TWT operation applicable in an OBSS environment can be performed by an STA regardless of the OBSS NAV if a more data field in the final data transmitted before the start of a restricted TWT SP is set to 0.