Trigger-Frame PPDU Scheduling for 320 MHz EHT A-PPDU Uplink
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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, which affects communication performance and reliability.
Innovation Solution
The method involves transmitting physical layer protocol data units (PPDUs) that carry trigger frames to solicit trigger-based aggregate PPDU (A-PPDU) transmissions from multiple stations, utilizing non-high throughput duplicate PPDUs for bandwidths of 320 MHz, and include triggered response scheduling (TRS) Control subfields to configure HE and EHT TB PPDUs, aligning HE and EHT PPDU formats for orthogonal frequency domain operation.
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 efficiency and reliability are compromised due to format misalignment between HE and EHT PPDUs
Solution Approach 1:
The patent changes the bandwidth parameter from traditional 160 MHz to 320 MHz for EHT PPDUs, and introduces a non-HT duplicate PPDU format that can operate at both 160 MHz and 320 MHz. This parameter change allows the system to maximize throughput at 320 MHz while maintaining compatibility with HE PPDUs through the duplicate format, thereby resolving the contradiction between throughput maximization and transmission reliability.
2Adaptability or versatility
If non-HT duplicate PPDU format is used for 320 MHz bandwidth, then compatibility with HE STAs is improved, but device complexity increases due to format alignment requirements
Solution Approach 1:
The patent creates a non-HT duplicate PPDU that copies the essential structure of HE PPDUs but extends it to support 320 MHz bandwidth. This duplicate format allows EHT STAs to communicate with HE STAs using a familiar format while enabling higher throughput. The copying approach maintains compatibility without requiring HE STAs to understand EHT-specific formats, thus reducing the effective complexity for multi-vendor interoperability.
3Stability of the object's composition
If orthogonal frequency domain operation is implemented for HE and EHT PPDUs, then coexistence is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent segments the PPDU format into distinct fields with clear delimiters, including a Format field that explicitly indicates whether the PPDU is an HE or EHT format. This segmentation allows receiving STAs to easily detect and differentiate between HE and EHT PPDUs by examining the Format field, thereby reducing the difficulty of detection and measurement while maintaining stable orthogonal frequency domain operation for coexistence.
Data Source
AI summary
An access point (AP), a station (STA), and a wireless communication method are provided. 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.