Trigger-Based A-PPDU Format Alignment for 320 MHz Wi-Fi
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently achieving trigger-based aggregate physical layer protocol data unit (A-PPDU) transmission, particularly in Extremely High Throughput (EHT) Basic Service Sets (BSS) with large bandwidths like 320 MHz, leading to suboptimal throughput and reliability.
Innovation Solution
The proposed solution involves an access point (AP) and station (STA) that utilize trigger frames and aggregate MPDUs to facilitate efficient TB A-PPDU transmission, aligning HE and EHT TB PPDU formats, and employing orthogonal modulation fields to maximize throughput and reliability in EHT BSS with 320 MHz bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trigger-based A-PPDU transmission is implemented in EHT BSS with 320 MHz bandwidth, then throughput is maximized, but transmission reliability deteriorates due to format alignment issues between HE and EHT STAs
Solution Approach 1:
The patent changes the parameter of PPDU format structure by introducing a unified EHT TB PPDU format that supersedes the HE TB PPDU format. This format change includes modifying the signal fields (U-SIG, EHT-SIG), training fields (EHT-STF, EHT-LTF), and data field structure to accommodate 320 MHz bandwidth while maintaining compatibility. The format parameter changes enable both HE and EHT STAs to interpret the transmission correctly, resolving the reliability issue while maintaining high throughput.
Solution Approach 2:
The patent creates a universal EHT TB PPDU format that serves multiple functions: it works for both HE STAs and EHT STAs, supports both 160 MHz and 320 MHz bandwidths, and can carry trigger-based transmissions from multiple STAs. This universal format eliminates the need for separate HE and EHT specific formats, allowing the system to achieve high throughput across different STA types and bandwidth configurations while ensuring reliable transmission through consistent format interpretation.
2Adaptability or versatility
If HE and EHT TB PPDU formats are kept separate, then compatibility with existing HE STAs is maintained, but device complexity increases due to format differentiation and interpretation requirements
Solution Approach 1:
Instead of maintaining separate HE and EHT formats as previously done, the patent inverts the approach by making the EHT TB PPDU format the universal standard that replaces the HE format. HE STAs interpret the EHT format using their existing protocols, while EHT STAs use the native format. This inversion reduces device complexity by eliminating the need for complex format detection and switching logic, as all transmissions use the same EHT format structure.
3Productivity
If 320 MHz bandwidth is utilized in EHT BSS, then throughput is maximized, but signal stability deteriorates due to increased susceptibility to interference and channel variations
Solution Approach 1:
The patent segments the 320 MHz bandwidth into multiple resource units (RUs) that can be independently allocated to different STAs and modulated using orthogonal frequency division multiplexing (OFDMA). This segmentation divides the large bandwidth into smaller, more stable sub-channels, reducing the impact of interference and channel variations on any single transmission. The trigger frame mechanism further segments the transmission by coordinating uplink transmissions from multiple STAs in a structured manner, enhancing overall signal stability while maintaining high aggregate throughput.
Data Source
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Figure 3B~4
Figure 5A
AI summary
An access point (AP), a station (STA), and a wireless communication method are provided. In an embodiment, the method includes receiving, by a STA (e.g., an EHT STA), a physical layer protocol data unit (PPDU) which carries one or more trigger frames for performing a high efficiency (HE) trigger-based (TB) PPDU transmission or an extremely high efficiency (EHT) TB PPDU transmission of a TB aggregate PPDU (A-PPDU) transmission to an AP. In another embodiment, the method includes receiving, by an EHT STA, a PPDU which carries two or more aggregate medium access control (MAC) protocol data units (A-MPDUs) for performing any of one or more HE TB PPDU transmission and one or more EHT TB PPDU transmission of a TB A-PPDU transmission to an AP. This can efficiently achieve a TB A-PPDU transmission and/or maximize throughput of an EHT basic service set (BSS) with large bandwidth (e.g., 320 MHz).