Punctured Preamble Mechanism for Dynamic Channel Switching in Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face performance limitations when operating in channels with primary services, particularly in 80 or 160 MHz bandwidths, due to restrictions on channel usage and interference from legacy devices, leading to inefficient use of bandwidth and reduced network performance.
Innovation Solution
A punctured preamble mechanism allows 20 MHz/80 MHz operating STAs to dynamically switch to secondary channels, enabling efficient use of 80 or 160 MHz channels by coordinating channel switches with the AP and applying EHT cooperative multi-band operations for simultaneous multi-band communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 20 MHz operating STA is limited to a primary 20 MHz channel, then device compatibility is maintained, but bandwidth utilization and network performance are reduced
Solution Approach 1:
The patent implements dynamic channel switching where 20 MHz operating STAs can transition between primary and secondary channels based on AP coordination. The AP sends indication information to guide STAs on which channel to use, enabling flexible adaptation without requiring STAs to support multiple fixed channel configurations, thus resolving the contradiction between channel flexibility and network performance.
Solution Approach 2:
The system changes the operating channel parameter dynamically rather than fixing it. The AP controls the channel selection by sending indication information to STAs, allowing the same 20 MHz STA to operate on different channels (primary or secondary) based on network conditions and AP decisions, thereby improving bandwidth utilization while maintaining compatibility.
2Productivity
If an AP utilizes an entire 80 MHz bandwidth, then bandwidth utilization is improved, but 20 MHz operating STAs experience performance limitations due to tone mapping misalignment
Solution Approach 1:
The 80 MHz channel is segmented into primary 20 MHz channel and secondary 20 MHz channel. The AP transmits indication information to STAs to identify which specific 20 MHz channel should be used, effectively dividing the wideband resource into manageable segments that align with 20 MHz STA capabilities while still utilizing the full 80 MHz bandwidth through coordinated channel selection.
Solution Approach 2:
The AP acts as an intermediary that resolves the tone mapping misalignment issue. By sending indication information to guide STAs on channel selection, the AP coordinates the transmission parameters to ensure proper alignment between the 80 MHz resource unit tone mapping and the 20 MHz channel tone mapping, thereby maintaining communication reliability while utilizing wideband resources.
3Reliability
If overlapping basic service set (BSS) operation is avoided in primary 80 MHz channel, then interference is reduced, but channel efficiency and bandwidth utilization are decreased
Solution Approach 1:
The patent implements dynamic channel allocation where the AP can flexibly assign STAs to primary or secondary 20 MHz channels based on interference conditions and network load. This dynamic assignment allows the system to tolerate overlapping BSS operations by coordinating channel usage, thereby improving channel efficiency without compromising interference management through adaptive resource allocation.
Data Source
AI summary
Embodiments of the present invention provide a punctured preamble enabling wireless devices to efficiently use a channel (e.g., an 80 or 160 MHz channel) where a primary service is operating. A Wideband Channel Access Mechanism for 20 MHz/80 MHz operating STAs is provided so that a 20 MHz/80 MHz operating STA can dynamically move to a secondary channel to improve wireless performance of the STA. An AP coordinates the operating channel switch of the 20 MHz/80 MHz operating STA. An EHT cooperative multi-band operation can be applied to the preamble punctured PPDU0 for simultaneous multi-band operation.