Wireless Communication Apparatus BSS Identification Preamble Detection
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Solution Overview
Problem
In overcrowded wireless LAN environments, preamble detection rates are decreased, leading to difficulties in demodulating data signals and configuring network allocation vectors, which can result in incorrect channel utilization status recognition and increased interference with adjacent devices.
Innovation Solution
A wireless communication apparatus that acquires BSS identification information to determine whether to receive or not receive a physical layer frame, configuring it to avoid frames addressed to different BSS, and performing standby operations based on IFS periods, thereby improving preamble detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless LAN device receives all physical layer frames in overcrowded environments, then the CCA-ED threshold is set high to detect all signals, but this increases interference with adjacent wireless LAN devices
Solution Approach 1:
The patent segments the reception process by dividing frames into those addressed to the same BSS and those addressed to different BSSs. The wireless communication apparatus selectively receives only frames addressed to its own BSS, while ignoring frames from other BSSs. This segmentation allows the CCA-ED threshold to be optimized for detecting relevant frames without being constrained by the need to detect all frames, thereby reducing interference with adjacent devices.
Solution Approach 2:
Instead of the conventional approach of receiving all frames and then filtering, the patent inverts the logic by proactively determining which frames to ignore based on BSS identification information in the preamble. The apparatus decides not to receive frames addressed to different BSSs before fully processing them, turning the filtering operation into a selective reception strategy that improves both detection accuracy and reduces interference.
2Reliability
If the wireless LAN device performs reception operation on all physical layer frames, then channel utilization status can be recognized, but preamble detection rate decreases in overcrowded environments
Solution Approach 1:
The patent segments the frame reception based on BSS identification. By dividing frames into relevant (same BSS) and irrelevant (different BSS) categories, the apparatus can focus its detection efforts on relevant frames only. This segmentation improves preamble detection rate for frames that matter, while still maintaining reliable channel utilization status recognition through selective reception and standby operations.
Solution Approach 2:
The patent applies preliminary action by performing reception execution determination before full frame reception. The apparatus uses BSS identification information in the preamble to pre-determine whether to proceed with receiving the entire frame. This preliminary filtering action improves detection efficiency by avoiding processing of irrelevant frames, while maintaining reliability through proper standby operations based on IFS periods.
3Object-affected harmful factors
If the wireless communication apparatus selectively ignores frames from different BSS, then interference with adjacent devices is reduced, but the apparatus must accurately identify BSS to make correct reception decisions
Solution Approach 1:
The patent uses preliminary action by extracting and using BSS identification information from the preamble before making reception decisions. The apparatus performs this identification early in the frame processing sequence, allowing it to make accurate go/no-go decisions about receiving the entire frame. This preliminary identification reduces interference while maintaining accuracy because the BSS information is obtained before the selective ignoring takes effect.
Solution Approach 2:
The BSS identification information in the preamble acts as an intermediary that mediates between the received frame and the reception decision. Instead of making direct reception decisions based on all frame contents, the apparatus uses this intermediary BSS information to filter frames. This intermediary mechanism simplifies the detection process and reduces interference while maintaining identification accuracy.
Data Source
AI summary
A BSS to which a destination wireless communication apparatus of a physical layer frame belongs is identified, and accuracy of preamble detection is improved by changing a reception operation. A wireless communication apparatus includes a reception unit that detects a frame including information for identifying a BSS, and a control unit that switches between a first operation in a case where the frame is a frame which is associated with a BSS to which the wireless communication apparatus belongs and a second operation in a case where the frame is a frame which is not associated with the BSS to which the wireless communication apparatus belongs. Carrier sensing is not performed in the first operation, and the carrier sensing is performed in the second operation.