Wireless LAN Preamble Signaling for Incompatible Frame Filtering
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Solution Overview
Problem
Communication devices that adhere to older wireless LAN standards continue to read radio frames intended for newer standards, leading to increased power consumption without being able to communicate effectively, as they are not adaptable to these newer standards.
Innovation Solution
Incorporating a preamble in radio frames that includes fields indicating the standard compatibility, allowing devices to identify and discard frames incompatible with their capabilities, thereby reducing unnecessary reading and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication devices continuously read radio frames to determine standard compatibility, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by adding a standard indication field to the preamble of radio frames before the main data field. This allows receiving devices to preliminarily determine standard compatibility during the preamble reading phase, which consumes less power, before committing to read the entire frame. This preliminary identification enables early termination of frame reading for incompatible standards, thus reducing overall power consumption while maintaining communication reliability.
2Measurement precision
If devices read complete radio frames to identify standard compatibility, then standard identification accuracy is improved, but time consumption increases
Solution Approach 1:
The patent applies segmentation by dividing the radio frame into distinct parts: the preamble (which includes the standard indication field) and the data field. The standard indication field is specifically placed in the preamble, allowing devices to segment the reading process into two stages: first reading the preamble to identify standard compatibility, and only if compatible, proceeding to read the data field. This segmentation enables accurate standard identification without the time penalty of reading entire frames for incompatible standards.
Data Source
AI summary
A communication device communicates a radio frame including a preamble and a data field of a physical layer (PHY). The preamble includes an L-STF (Legacy Short Training Field), an L-LTF (Legacy Long Training Field), an L-SIG (Legacy Signal Field), an EHT-SIG-A (Extremely High Throughput Signal A Field), an EHT-STF, and an EHT-LTF, and the EHT-SIG-A includes a field indicating a standard that the radio frame complies with.