EHT Wireless Preamble Puncturing for 320 MHz Legacy Compatibility
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Solution Overview
Problem
Current wireless communication systems face challenges in providing bandwidth indications and truncating transmission opportunities (TXOPs) for Extremely High Throughput (EHT) operations without causing interference with legacy devices, particularly in 160+160/320 MHz channels.
Innovation Solution
The method involves using preamble puncturing techniques, where RTS/CTS frame exchange sequences and TXOP truncation are performed using subchannels indicated in a bitmap subfield, allowing for efficient bandwidth management and interference avoidance by transmitting data in non-HT duplicate PPDUs with punctured preambles across multiple stations or a single station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If preamble puncturing is used to avoid interference with legacy devices in 160+160/320 MHz channels, then legacy device compatibility is improved, but bandwidth utilization deteriorates due to punctured portions
Solution Approach 1:
The patent segments the 160+160/320 MHz channel into multiple 20 MHz subchannels and uses bitmaps to indicate which subchannels are punctured for legacy device compatibility. This allows selective preservation of certain frequency portions while avoiding others, resolving the contradiction between maintaining legacy compatibility and utilizing available bandwidth.
Solution Approach 2:
The patent implements dynamic bandwidth indication through bitmap fields in RTS/CTS frames, allowing the system to adaptively adjust which subchannels are punctured based on real-time legacy device activity. This dynamic approach optimizes bandwidth utilization while maintaining legacy compatibility when needed.
2Productivity
If bandwidth indication is provided for EHT operations in 160+160/320 MHz channels, then channel usage optimization is improved, but system complexity worsens due to additional signaling requirements
Solution Approach 1:
The patent reuses existing RTS/CTS frame structures and bitmap fields for dual purposes: traditional channel access coordination and bandwidth indication for EHT operations. This multi-functionality approach provides channel optimization without adding separate signaling protocols, thus avoiding excessive complexity.
Solution Approach 2:
The patent modifies existing frame parameters (bandwidth fields, bitmap interpretations) to convey EHT-specific bandwidth information. By changing how existing parameters are used rather than adding new signaling elements, the system achieves channel optimization while minimizing complexity increases.
3Object-affected harmful factors
If TXOP truncation is performed using preamble puncturing, then interference avoidance with legacy devices is improved, but transmission efficiency deteriorates due to truncated transmission opportunities
Solution Approach 1:
The patent performs preliminary puncturing decisions in the RTS phase, where the transmitting station indicates which subchannels will be punctured before the actual data transmission. This allows the receiving station to prepare accordingly and avoids mid-TXOP interruptions, maintaining efficiency while ensuring interference avoidance.
Solution Approach 2:
The patent allows EHT transmissions to skip over punctured subchannels during TXOP, rushing through the necessary data transmission on available subchannels without waiting for legacy device clearance. This maintains transmission efficiency by utilizing available bandwidth while still avoiding interference on protected subchannels.
Data Source
AI summary
Embodiments of the present invention are drawn to electronic systems that perform EHT operations for a wireless network supporting a 160+160 MHz/320 MHz operating mode. RTS/CTS frame exchange sequences and TXOP truncation can be performed using punctured preambles according to subchannels indicated in a bitmap subfield (e.g., an Allowed Bitmap Subfield). Preamble puncturing is supported for EHT PPDUs transmitted to multiple STAs using MU-RTS/MU-CTS frames transmitted in non-HT duplicate PPDUs. Preamble puncturing is also supported for an EHT PPDU transmitted to a single STA. The RTS and CTS frames can be sent in a non-HT duplicate PPDU with preamble puncturing, for example.