WLAN Trigger Frame Bandwidth Signaling for EHT TB PPDU Uplink
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Solution Overview
Problem
Existing IEEE 802.11be EHT WLAN systems face challenges in maximizing throughput with large bandwidths by effectively soliciting high efficiency (HE) and extremely high throughput (EHT) physical layer protocol data unit (PPDU) transmissions using trigger frames.
Innovation Solution
The implementation of a method and apparatus for generating and transmitting trigger frames that indicate the type and bandwidth of TB PPDUs, including HE, EHT, or FD-A-PPDUs, to optimize bandwidth allocation and transmission among stations in a WLAN, using subfields in the trigger frame to specify the bandwidth of solicited PPDUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If trigger frames are used to solicit TB PPDU transmissions in EHT WLAN with large bandwidths (160 MHz or 320 MHz), then multi-user transmission capability is improved, but bandwidth allocation efficiency deteriorates due to lack of explicit bandwidth indication mechanisms
Solution Approach 1:
The bandwidth indication is segmented into multiple subfields within the trigger frame: UL BW subfield for basic bandwidth indication, and optional UL BW Extension subfield and Delta EHT UL BW subfield for extended bandwidth specification. This segmentation allows flexible representation of different bandwidth sizes (20, 40, 80, 160, 320 MHz) while maintaining backward compatibility with existing HE STAs that only process the basic UL BW subfield.
Solution Approach 2:
The patent adds a new dimension to the trigger frame structure by introducing extension subfields that provide additional bandwidth information. This dimensional expansion allows the system to indicate larger bandwidths (beyond the original 2-bit UL BW subfield capability) without disrupting the existing frame format, enabling EHT STAs to utilize 160 MHz and 320 MHz channels efficiently.
2Adaptability or versatility
If the trigger frame format is extended to support EHT bandwidth indications, then support for 320 MHz bandwidth is improved, but device complexity increases due to additional subfields and processing requirements
Solution Approach 1:
The trigger frame structure is made dynamic and configurable. The presence of extension subfields (UL BW Extension and Delta EHT UL BW) is optional and determined by specific conditions. This dynamic structure allows the system to adapt to different deployment scenarios: when 320 MHz support is needed, the extension subfields are utilized; when not needed, the basic format suffices, reducing processing complexity for devices that don't require extended functionality.
Solution Approach 2:
The extended trigger frame format serves multiple functions: it maintains compatibility with existing HE STAs through the basic UL BW subfield while simultaneously enabling EHT STAs to access larger bandwidths using the extension subfields. This multi-functionality allows a single trigger frame structure to serve both legacy and advanced devices, reducing the need for separate processing paths and minimizing overall device complexity.
3Reliability
If existing 802.11ax trigger frames are used without enhancement, then backward compatibility is maintained, but throughput maximization in large bandwidth EHT BSS cannot be achieved
Solution Approach 1:
The patent prepares the trigger frame structure in advance to accommodate future bandwidth requirements. By pre-defining the extension subfields and their encoding schemes in the 802.11be standard, the system ensures that when EHT STAs operate in 160 MHz or 320 MHz BSS, the bandwidth indication mechanism is already in place and optimized, eliminating the need for retroactive modifications and enabling immediate throughput maximization in large bandwidth scenarios.
Data Source
AI summary
Embodiments of the disclosure provide methods and apparatuses for soliciting a trigger-based (TB) physical layer protocol data unit (PPDU) transmission in wireless local area network (WLAN). The method includes: receiving, by a STA, a trigger frame which is used to solicit a type of TB PPDU transmissions from a plurality of STAs in the WLAN, the type of TB PPDU transmissions including high efficiency (HE) trigger-based (TB) PPDU transmissions, extremely high throughput (EHT) TB PPDU transmissions, or TB frequency domain aggregated PPDU (FD-A-PPDU) transmissions, and one or two subfields in the trigger frame indicate a bandwidth (BW) of the solicited TB PPDU, and transmitting, by the STA, the solicited TB PPDU in the BW indicated by the one or two subfields in the trigger frame.