FD-A-PPDU Transmission Alignment Across HE and EHT MU PPDUs
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Solution Overview
Problem
The challenge in IEEE 802.11be Extremely High Throughput (EHT) Wireless Local Area Networks (WLAN) is aligning multiple Multi-User PPDUs in a Frequency Domain-Aggregated-Physical layer Protocol Data Unit (FD-A-PPDU) to ensure similar durations, particularly in EHT BSS with large bandwidths like 320 MHz.
Innovation Solution
A network device prepares a FD-A-PPDU for multiple STAs by allocating bandwidth and puncturing specific subchannels to ensure minimal misalignment time among MU PPDUs, including HE and EHT MU PPDUs, using predefined transmission parameters and generating the FD-A-PPDU based on adjusted transmission times and padding symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple MU PPDUs are transmitted in an FD-A-PPDU with different formats (HE MU PPDU and EHT MU PPDU), then the system supports both legacy and new stations, but the transmission durations of different MU PPDUs become misaligned
Solution Approach 1:
The patent applies preliminary action by calculating and determining the transmission duration of each MU PPDU format in advance before actual transmission. The network device determines the duration of HE MU PPDU and EHT MU PPDU separately based on their respective formats, then uses this pre-determined duration information to align the transmissions properly, ensuring that both legacy HE stations and new EHT stations can receive data simultaneously without duration misalignment issues
Solution Approach 2:
The patent applies local quality by treating different MU PPDU formats (HE MU PPDU and EHT MU PPDU) with different duration determination methods appropriate to each format. Instead of using a uniform approach, the system selectively applies format-specific duration calculation rules to each type of PPDU, allowing each to maintain its structural characteristics while achieving overall transmission alignment
2Productivity
If the FD-A-PPDU is transmitted over a large bandwidth (e.g., 320 MHz), then the throughput is maximized, but the scheduling complexity and difficulty of aligning multiple MU PPDUs increase
Solution Approach 1:
The patent applies segmentation by dividing the 320 MHz bandwidth into multiple non-contiguous 80 MHz frequency segments, with each segment carrying a separate MU PPDU. This segmentation approach allows the system to maintain high overall throughput by utilizing the full bandwidth while reducing scheduling complexity, as each segmented PPDU can be independently managed and aligned according to its specific format requirements
Solution Approach 2:
The patent reduces scheduling complexity through preliminary action by pre-determining the transmission duration of each MU PPDU based on its format before actual transmission scheduling. The network device calculates the duration of HE MU PPDU and EHT MU PPDU in advance, then uses this information to coordinate the simultaneous transmission across multiple frequency segments, simplifying the real-time scheduling process
Data Source
AI summary
The present disclosure provides a data transmission method applied in a network device. The method includes obtaining an initial transmission time of a Frequency Domain-Aggregated-Physical layer Protocol Data Unit (FD-A-PPDU) including at least two Multi-User (MU) PPDUs; obtaining an initial number of A-PPDU padding symbols for each of the at least two MU PPDUs; determining a first transmission time of the FD-A-PPDU and a first number of A-PPDU padding symbols for each of the at least two MU PPDUs based on the initial transmission time of the FD-A-PPDU and the initial number of A-PPDU padding symbols for each of the at least two MU PPDUs; generating the FD-A-PPDU based on the first transmission time of the FD-A-PPDU and the first number of A-PPDU padding symbols for each of the at least two MU PPDUs; and transmitting the generated FD-A-PPDU to a plurality of terminal devices.