Trigger Frame Signaling for Punctured Subbands in Wi-Fi 6E
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Solution Overview
Problem
In Wi-Fi Standard 802.11be, stations (STAs) face challenges in signaling and decoding punctured subbands during trigger-based uplink (UL) orthogonal frequency division multiple access (OFDMA) transmissions, as they cannot always indicate the reduced bandwidth in the signaling field, leading to inefficiencies in bandwidth utilization.
Innovation Solution
The introduction of new fields and bits in the trigger frame and UL OFDMA data frame allows STAs to signal bandwidth reduction, enabling access points (APs) to blindly detect reduced bandwidth and reducing decoding complexity by specifying rules for bandwidth reduction, including the use of BW Reduction Enable (BRE) and BW Reduction Segment Enable (BRSE) fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If STAs transmit on partial bandwidths due to busy or disallowed spectrum portions, then bandwidth utilization is improved, but signaling complexity increases because STAs cannot indicate the reduced bandwidth in the SIG field
Solution Approach 1:
The patent introduces a new trigger frame structure with specific fields (BRE and BRSE) that act as intermediaries to convey bandwidth reduction information. Instead of modifying the SIG field or requiring complex signaling from STAs, the AP uses these dedicated fields in the trigger frame to indicate which resource units have reduced bandwidth, thereby resolving the signaling complexity issue while maintaining improved bandwidth utilization
Solution Approach 2:
The patent implements preliminary action by having the AP pre-configure and signal the bandwidth reduction information in the trigger frame before the actual data transmission occurs. The BRE and BRSE fields are set in advance to indicate which RUs are punctured, allowing STAs to prepare their transmissions accordingly without needing to signal their own bandwidth reductions
2Measurement precision
If STAs signal bandwidth reduction in the SIG field, then decoding accuracy is improved, but signaling availability deteriorates because SIG field-based signaling may be unavailable in some implementations
Solution Approach 1:
The patent achieves universality by implementing bandwidth reduction signaling through the trigger frame mechanism, which is a fundamental and universally available component in trigger-based OFDMA transmissions. The BRE and BRSE fields are integrated into the existing trigger frame structure, ensuring compatibility across different implementations without relying on optional SIG field extensions or implementation-specific signaling mechanisms
3Device complexity
If APs blindly detect reduced bandwidth without signaling, then device complexity is reduced, but detection reliability deteriorates due to increased decoding complexity
Solution Approach 1:
The patent implements feedback by providing explicit bandwidth reduction information through the BRE and BRSE fields in the trigger frame. The AP signals which RUs have reduced bandwidth, and STAs feedback their actual transmission bandwidth through the presence or absence of data in the allocated RUs. This feedback mechanism allows reliable detection of bandwidth reduction without requiring complex blind detection algorithms, thereby maintaining both low decoding complexity and high detection reliability
Data Source
AI summary
In some aspects, the disclosure is directed to methods and systems for signaling and decoding of punctured sub-bands in a trigger-based PPDU. In one aspect, at least one of the communication interface or the processing circuitry of a wireless communication device is configured to generate a trigger frame that includes signaling indicating that at least one other wireless communication device is allowed to reduce a bandwidth of an allocated resource unit (RU) for transmitting data via a communication channel; transmit, via the communication channel, the trigger frame to at least one other wireless communication device; receive, via the communication channel and from the at least one other wireless communication device, an uplink (UL) orthogonal frequency division multiple access (OFDMA) frame including the data; and process the UL OFDMA frame including the data based on the signaling.