Station Radio Frame Reception NAV Control
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Solution Overview
Problem
In wireless local area networks (WLANs), the existing technologies fail to provide a method for an STA to discard a PPDU without updating the NAV, leading to issues like sending collisions due to hidden stations and incorrect channel access, as they lack a procedure for realizing this function.
Innovation Solution
A method where a first functional entity of a station detects channel signal intensity, starts receiving the radio frame, and sends indications to a second functional entity about channel busy/idle states, determining if it's not a target station, and discarding the PPDU by sending specific indications to avoid updating the NAV, thus preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the STA updates the NAV after detecting any radio frame, then the channel reservation is maintained, but sending collisions occur due to hidden stations incorrectly accessing the channel
Solution Approach 1:
The patent applies local quality by making the NAV update behavior dependent on the specific type of radio frame received. Instead of uniformly updating NAV for all frames, the system selectively updates NAV only for frames intended for the local STA or containing relevant channel reservation information, while ignoring frames for other stations. This localized differentiation resolves the contradiction by preventing collision-causing NAV updates while maintaining necessary channel reservations.
Solution Approach 2:
The patent inverts the conventional approach by not updating the NAV as the default action upon detecting a radio frame. Instead, it establishes a rule where NAV is updated only under specific conditions (when the frame is intended for the local STA or contains relevant reservation info), effectively inverting the traditional always-update behavior to eliminate collision problems caused by inappropriate NAV updates.
2Productivity
If the STA discards the PPDU without updating NAV, then channel access efficiency improves, but collisions may occur due to incorrect channel state perception
Solution Approach 1:
The patent applies local quality by differentiating the handling of different radio frame types. For frames intended for the local STA, the system performs complete reception and NAV update. For frames not intended for the local STA, the system discards the PPDU without updating NAV. This localized differentiation enables efficient channel access by avoiding unnecessary NAV updates while maintaining accurate channel state perception for relevant frames.
Solution Approach 2:
The patent extracts only the necessary information from detected radio frames - specifically, it extracts and processes NAV information only from frames that are relevant to the local STA (frames intended for the STA or containing applicable channel reservation info). For irrelevant frames, the system extracts no NAV information and discards the PPDU. This selective extraction improves channel access efficiency by eliminating unnecessary processing while maintaining reliability for relevant frames.
3Loss of information
If the STA receives and processes all radio frames, then no information is missed, but energy consumption increases and processing time is wasted
Solution Approach 1:
The patent extracts only the essential information needed from detected radio frames - specifically, it checks frame headers to determine if the frame is intended for the local STA or contains relevant channel reservation information. For relevant frames, it performs complete reception and processing. For irrelevant frames, it extracts no further information and discards the PPDU immediately. This selective extraction significantly reduces energy consumption and processing time while maintaining information completeness for relevant frames.
Solution Approach 2:
The patent applies partial action by performing complete reception and processing only for radio frames that are relevant to the local STA, while performing minimal processing (header check only) and discarding irrelevant frames. This partial processing approach avoids the excessive energy consumption and processing time associated with fully receiving and processing all frames, while maintaining information completeness for the subset of frames that matter.
Data Source
AI summary
Disclosed are a method and device for receiving the radio frame. The method comprises: a first functional entity of a station detects that a channel signal intensity reaches a preset threshold, and the first functional entity starts receiving a radio frame and sends an indication that a channel detection result is busy to a second functional entity of the station; the first functional entity determines that the station is not a target station for receiving the radio frame, and sends an indication of ending up receiving the radio frame to the second functional entity; and when transmission of the radio frame ends, the first functional entity sends an indication that the channel detection result is idle to the second functional entity. The disclosure provides a reception operation processing procedure of a station having the function of discarding the radio frame while not updating a network allocation vector (NAV).