WiFi PPDU Reception Signaling for Unsynchronized Zero-Power STAs
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Solution Overview
Problem
Zero-power-consumption stations (STAs) in WiFi communications face challenges in maintaining accurate time synchronization with access points (APs), leading to poor precision in signal transmission and reception.
Innovation Solution
A wireless communication method where the AP indicates to the zero-power-consumption STA whether to receive the data part of a PPDU frame, using first information to indicate the frame type, time information, or receiving terminal, allowing the STA to determine reception based on this indication rather than relying on accurate time synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a zero-power-consumption STA is used to reduce power consumption, then power consumption is reduced, but time synchronization precision deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism where the AP sends indication information to guide the STA on whether to receive data parts of PPDU frames. This mediator (indication information) allows the STA to operate with poor local timing precision while still achieving accurate information reception, as the AP compensates for the timing synchronization deficiency through explicit reception instructions.
2Measurement precision
If the STA maintains accurate time synchronization to improve transmission precision, then transmission precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the time synchronization function from the STA and relocates it to the AP. Instead of requiring the STA to maintain accurate local timing, the system separates the synchronization responsibility to the AP, which sends indication information to guide reception. This extraction reduces the STA's device complexity while maintaining transmission precision.
3Reliability
If the STA receives all PPDU frames to ensure no data is missed, then information completeness is improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by having the STA receive only selected PPDU frames based on indication information from the AP, rather than all frames. The indication information enables the STA to perform partial reception (only when needed), reducing power consumption while the AP ensures information completeness by controlling what the STA should receive.
4Use of energy by moving object
If the STA uses poor precision local timing to reduce power consumption, then power consumption is reduced, but information transmission accuracy deteriorates
Solution Approach 1:
The indication information acts as an intermediary that bridges the gap between poor local timing precision and accurate information transmission. The AP sends this intermediary signal to compensate for the STA's timing deficiencies, allowing the STA to use low-precision local timing while still achieving accurate information reception through AP-guided selection.
Data Source
AI summary
A wireless communication method includes: a STA being indicated by an AP whether to receive a data part of a first PPDU frame.