WLAN AP Filtering of Non-BSS MU-PPDUs for Lower Processing Load
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Solution Overview
Problem
Existing wireless local area network (WLAN) technologies face challenges in efficiently transmitting data in congested environments, particularly in achieving high throughput and compatibility with legacy systems while minimizing interference and power consumption.
Innovation Solution
A wireless device and method that generate frames with phase-rotated subchannels to support High Efficiency WLAN (HEW) systems, using phase rotation values to differentiate and decode frames, allowing for increased subcarrier efficiency and compatibility with legacy devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the AP processes MU-PPDU from non-BSS stations without filtering, then the transmission efficiency is improved by allowing concurrent uplink transmissions, but the AP consumes excessive processing resources and experiences high power consumption
Solution Approach 1:
The patent extracts and filters out MU-PPDUs from non-BSS stations before they reach the AP for processing. The AP receives PPDU, determines whether it is an MU-PPDU, identifies if the transmitting station belongs to the BSS, and discards MU-PPDUs from non-BSS stations. This prevents the AP from consuming processing resources and power on packets that should not be processed, while still allowing legitimate BSS MU-PPDUs to be processed efficiently.
2Reliability
If the AP processes all received PPDU including MU-PPDU from non-BSS stations, then no data is lost, but the channel occupancy time is excessively consumed and transmission efficiency decreases
Solution Approach 1:
The patent extracts and removes MU-PPDUs from non-BSS stations from the processing stream. By determining the BSS membership of the transmitting station and filtering out non-BSS MU-PPDUs, the system prevents these packets from occupying channel time unnecessarily, thereby improving overall transmission efficiency while maintaining reliability for legitimate BSS traffic.
Solution Approach 2:
Instead of processing all PPDU and then filtering results, the patent inverts the approach by pre-filtering MU-PPDUs based on BSS membership determination before full processing. This inversion occurs at the reception stage where the AP determines whether the station is a BSS member upon receiving MU-PPDU, and discards non-BSS packets immediately, avoiding wasted channel occupancy time.
3Use of energy by moving object
If the AP discards MU-PPDU from non-BSS stations, then processing resources are saved and power consumption reduces, but the risk of missing valid data increases
Solution Approach 1:
The patent performs preliminary verification of BSS membership before discarding MU-PPDU. The AP determines whether the transmitting station is a BSS member using information in the PPDU (such as BSS color or association identifiers) before making the discard decision. This preliminary action ensures that only confirmed non-BSS MU-PPDUs are discarded, preventing valid BSS data from being lost while still saving power by discarding genuine non-BSS packets.
Solution Approach 2:
The system uses feedback from the PPDU content (such as BSS color fields, association identifiers, or station addresses) to determine BSS membership. This feedback mechanism allows the AP to make accurate decisions about whether to process or discard each MU-PPDU, ensuring that power is saved on invalid packets while maintaining reliability by processing valid BSS packets.
4Reliability
If the AP processes HE-TWT service period requests from non-BSS stations, then service quality is maintained, but unnecessary processing overhead and latency are introduced
Solution Approach 1:
The patent performs preliminary BSS membership verification when receiving HE-TWT service period requests. Before processing the full service period establishment procedure, the AP determines whether the requesting station belongs to the BSS. This preliminary action prevents non-BSS stations from entering the time-consuming service period setup process, thereby reducing processing latency and overhead while maintaining service quality for legitimate BSS stations.
Data Source
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AI summary
A method and a device for receiving transmitting data in in a wireless local area network are provided. The device receives a physical layer protocol data unit (PPDU) from a station over a transmission bandwidth and determines whether the station is a member of a basic service set (BSS) managed by the device based on the PPDU. When the PPDU is a multi-user (MU)-PPDU, the AP determines that the station is not a member of the BSS managed by the AP. Such MU-PPDU includes a first signal field and a second signal field, the first signal field having bandwidth information indicating the transmission bandwidth, the second signal field having user-specific information with allocation for orthogonal frequency division multiple access (OFDMA) transmission.