L-LTF Field Embeds Control Data for Wi-Fi Power Reduction
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Solution Overview
Problem
Wireless communication devices face challenges in reducing power consumption and efficiently determining whether they are the intended recipients of Wi-Fi transmissions, leading to increased power usage and potential delays in preparing receive blocks for data reception.
Innovation Solution
Incorporating destination and length information into the L-LTF field of Wi-Fi transmissions, using BPSK or 90-degree rotated BPSK signaling to maintain backward compatibility, allowing devices to quickly determine if they are the intended recipients and adjust their receive blocks accordingly, thereby reducing power consumption and improving timing budgets for reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices monitor the medium continuously to determine transmission destination and length, then reliable detection of control information is achieved, but power consumption increases
Solution Approach 1:
The patent embeds destination and length information in the L-LTF field at the beginning of the PHY preamble, allowing devices to obtain control information before the main data transmission. This preliminary provision of control information enables devices to make early decisions about whether to continue monitoring or enter sleep mode, significantly reducing overall power consumption while maintaining reliable detection capability.
2Loss of information
If devices wait for control information in later PHY fields, then complete information is available, but timing budget for receiving setup is reduced
Solution Approach 1:
By placing destination and length information in the L-LTF field at the very beginning of the transmission, the patent provides control information earlier than conventional approaches. This early provision increases the timing budget available for receiving setup, allowing devices more time to configure their receive blocks according to the specific parameters of the incoming transmission.
3Loss of time
If L-LTF field is modified to include control information, then early indication capability is improved, but backward compatibility may be compromised
Solution Approach 1:
The patent merges control information embedding with the existing L-LTF training sequence structure. By integrating destination and length information into the L-LTF field in a way that maintains the field's original channel estimation functionality, the patent achieves early control information indication while preserving backward compatibility with legacy devices that expect standard L-LTF formats.
Data Source
AI summary
A backward compatible L-LTF design that can provide control information in addition to channel estimation information in conjunction with Wi-Fi communication techniques. A wireless transmission may be received by a wireless device. The wireless transmission may include a physical layer (PHY) preamble and PHY data. The PHY preamble may include a field that has a training sequence configured for channel estimation and control information. The control information may be determined by the wireless device, and the wireless device may configure reception parameters for the wireless transmission based on the control information.