Non-long range preamble spoofing symbols for wireless packet processing
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Solution Overview
Problem
Wireless devices that do not support the long range physical layer protocol data unit (PPDU) unnecessarily consume power attempting to decode the legacy preamble and long range portion before discarding the long range PPDU.
Innovation Solution
Incorporating spoofing symbols and a repetition of these symbols in the non-long range preamble portion of the PPDU allows non-legacy devices to determine the PPDU type at an extended range without decoding the long range portion, thereby saving power and ensuring backwards compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the long range PPDU includes a legacy preamble followed by a long range portion, then the transmission range is extended, but non-legacy devices unnecessarily consume power attempting to decode the entire packet
Solution Approach 1:
The PPDU is segmented into distinct portions: a legacy preamble portion that all devices can process, and a long range portion that only legacy-capable devices need to decode. The segmentation allows non-legacy devices to stop processing after the legacy preamble, saving power, while legacy devices continue to decode the long range portion for extended range communication.
Solution Approach 2:
The legacy preamble portion is placed at the beginning of the PPDU as a preliminary structure that all devices can decode. This preliminary action enables non-legacy devices to identify and discard unsupported packets early, before consuming power on the long range portion, while legacy devices use this same preamble as a foundation for further decoding.
2Adaptability or versatility
If the long range PPDU uses a legacy preamble format, then backwards compatibility is maintained, but non-legacy devices cannot distinguish long range packets from legacy packets at extended ranges
Solution Approach 1:
Different portions of the PPDU are given different qualities: the legacy preamble portion maintains exact compatibility with legacy standards for all devices, while the long range portion introduces new formats that only legacy-capable devices can decode. This local differentiation allows non-legacy devices to successfully process the legacy portion and discard the packet, while legacy devices continue to the long range portion for extended range operation.
3Measurement precision
If non-legacy devices decode the entire long range PPDU, then packet type identification is accurate, but power is wasted on packets that cannot be processed
Solution Approach 1:
The legacy preamble portion is extracted as a separate, self-contained structure that all devices can decode independently. This extraction allows non-legacy devices to obtain sufficient information from the legacy portion alone to identify unsupported packet types and discard them, without needing to invest power in decoding the entire long range PPDU.
Data Source
AI summary
A method and system comprises receiving a signal over an air interface. A binary sequence is detected in the signal. A legacy signal (L-SIG) field of a physical layer protocol data circuit (PPDU) is decoded based on the detected binary sequence and based on decoding the L-SIG field, two spoofing symbols which directly follow the L-SIG field is checked in the PPDU, wherein the two spoofing symbols comprise binary phase shift keying (BPSK) symbols. Based a presence of the two spoofing symbols, a long range portion of the PPDU is processed; and based on an absence of the two spoofing symbols, the PPDU is processed as a legacy PPDU.