Simultaneous Transmit Receive Frame Transmission Self-Interference Management
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Solution Overview
Problem
Current wireless LAN systems using In-band Full Duplex (IFD) or Simultaneous Transmit and Receive (STR) methods face challenges in maximizing capacity and efficiency due to self-interference, which affects the performance of frame transmission and reception.
Innovation Solution
A method for transmitting frames in a wireless LAN system that involves a wireless device performing receiving and transmitting operations simultaneously using a Simultaneous Transmit and Receive Physical Protocol Data Unit (STR PPDU), with specific carrier sensing rules and self-interference cancellation techniques to enhance performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Simultaneous Transmit and Receive (STR) method is used to increase wireless capacity, then frequency efficiency is improved, but self-interference occurs between transmission and reception signals
Solution Approach 1:
The patent segments the wireless communication process into distinct transmission and reception operations that can be managed separately. By dividing the frame structure into different portions (data field, padding field, delimiter) and assigning different carrier sensing requirements to each, the system can handle self-interference through segmented carrier sensing operations during STR mode
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of modified carrier sensing rules that act as a mediator between transmission and reception signals. The physical carrier sensing is performed on specific fields (data field, padding field, delimiter) to detect and manage self-interference, allowing the system to distinguish between actual external signals and self-generated interference
2Productivity
If In-band Full Duplex (IFD) or STR method is used to double wireless capacity, then frequency efficiency is improved, but system complexity increases due to self-interference management
Solution Approach 1:
The patent implements self-service through autonomous carrier sensing operations that automatically detect and manage self-interference without external intervention. The wireless device performs physical carrier sensing on its own transmitted fields (data field, padding field, delimiter) and automatically adjusts its reception operations based on the sensing results, eliminating the need for complex external interference management protocols
3Measurement precision
If carrier sensing is performed to detect self-interference, then signal detection accuracy is improved, but transmission time is increased due to additional sensing operations
Solution Approach 1:
The patent applies preliminary action by performing physical carrier sensing on the data field, padding field, and delimiter before final transmission decisions are made. This advance sensing allows the system to pre-identify self-interference patterns and adjust transmission parameters accordingly, preventing time loss during actual data transmission
Solution Approach 2:
The patent implements partial carrier sensing by selectively applying physical sensing only to specific fields (data field, padding field, delimiter) rather than the entire transmission signal. This partial action approach provides sufficient detection accuracy for self-interference management while minimizing the time overhead compared to complete signal sensing
Data Source
AI summary
A method for transmitting a frame in a WLAN system performed by a first wireless device may include: performing a receiving operation for a first STR PPDU within a first time resource based on a wireless channel, wherein the first STR PPDU is received from a second wireless device, and wherein a PHY header includes a BSS color information, an identification information, and an indication information, and, when the first wireless device is indicated by the identification information, in case a NAV timer value according to a logical carrier sense is equal to ‘0’, and in case a result of a physical carrier sense performed for the wireless channel, during a predetermined duration before the receiving operation is started, is in an idle state, performing a transmitting operation for a second STR PPDU within a second time resource overlapping with the first time resource based on the wireless channel.