Wireless Frame Filtering via Energy and Sample Decoding
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Solution Overview
Problem
In congested wireless signal environments, wireless stations experience 'deafness' due to receiving misdirected transmission frames, leading to inefficiencies in filtering out unwanted frames, which results in delayed classification and potential missed frames, especially when the signal-to-noise ratio is low, causing reduced throughput and connection instability.
Innovation Solution
Implementing a two-step filtering process: the first step filters out transmission frames based on physical layer header energy, and the second step filters based on decoding a sample portion of data codewords, allowing early identification and rejection of unwanted frames, thereby reducing deafness and improving connection stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless station waits for a successfully decoded MAC header to classify transmission frames, then the classification accuracy is improved, but the deafness time increases and throughput decreases
Solution Approach 1:
The patent applies preliminary action by performing frame classification before complete MAC header decoding. The system uses the PLCP header and partial MAC header information to make early classification decisions, allowing the wireless station to identify unwanted frames before waiting for the entire A-MPDU to decode, thus reducing deafness time while maintaining classification accuracy.
2Measurement precision
If the wireless station decodes the entire MAC header to filter unwanted frames, then the filtering accuracy is improved, but the processing time increases and connection stability decreases
Solution Approach 1:
The patent applies segmentation by dividing the frame decoding process into segments. Instead of requiring complete MAC header decoding, the system processes and classifies frames based on available information from the PLCP header and partial MAC header, allowing early filtering decisions that maintain both accuracy and connection stability.
3Measurement precision
If the wireless station uses MAC header filtering based on receive address, then the intra-BSS signal filtering is improved, but the processing delay increases when signal-to-noise ratio is low
Solution Approach 1:
The patent applies preliminary action by performing filtering operations earlier in the reception process. The system uses the PLCP header information and partial decoding to make filtering decisions before complete MAC header processing, reducing processing delay while maintaining effective intra-BSS signal filtering even under low signal-to-noise ratio conditions.
Data Source
AI summary
A method of processing wireless signals, including: receiving a wireless signal carrying a transmission frame having a physical layer header including a data rate index; decoding the physical layer header including the data rate index; filtering out the transmission frame for no further processing if a measured physical layer header energy is below an energy threshold corresponding to the decoded data rate index; decode a sample portion of data codewords of the transmission frame if the transmission frame is not filtered out, wherein the sample portion of data codewords is less than all of the data codewords of the transmission frame; and filtering out the transmission frame for no further processing if the decoding of the sample portion of data codewords fails, and otherwise decode a remainder of the transmission frame.