PPDU Frame Format with Predefined Training Field for Low Latency
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Solution Overview
Problem
Current wireless communication networks face challenges in providing efficient access to the wireless medium, particularly in scenarios with a high number of Wi-Fi devices, where existing Aggregate PHY Service Data Unit (A-PSDU) formats with High Throughput (HT) Signal (HT-SIG) fields may not support key performance indicators like high reliability and low latency alongside high throughput.
Innovation Solution
The implementation of a Physical Layer (PHY) Protocol Data Unit (PPDU) frame format that includes a predefined Training Field (TF) between data payload portions, allowing for efficient data transmission and reducing overhead, while integrating with preemption protocols to support low latency and improved reliability, especially in heavily loaded wireless networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If A-PSDU formats with HT-SIG fields are used for high throughput transmission, then data transmission rate is improved, but latency increases and reliability decreases for small packet applications
Solution Approach 1:
The PPDU is segmented into multiple data payload portions (first data payload portion and second data payload portion) that can be transmitted separately. This segmentation allows small packets to be transmitted independently without waiting for aggregation, thereby reducing latency while maintaining high throughput for larger data transmissions when aggregation is used.
Solution Approach 2:
The system dynamically selects between different transmission modes: aggregated A-PSDU formats for high throughput scenarios and non-aggregated PPDUs with predefined Training Fields for low latency scenarios. This dynamic adaptation allows the system to optimize performance based on real-time network conditions and packet characteristics.
2Productivity
If A-PSDU formats with HT-SIG fields are used for high throughput transmission, then data transmission rate is improved, but reliability decreases
Solution Approach 1:
By segmenting the transmission into separate PPDUs for small packets, each packet can be independently acknowledged and retransmitted if necessary, improving reliability through selective acknowledgment mechanisms while maintaining high overall throughput.
Solution Approach 2:
The predefined Training Field is prepared in advance between data payload portions, enabling receivers to quickly synchronize and prepare for incoming data without waiting for HT-SIG field processing, thereby improving reliability of data reception.
3Productivity
If aggregated PPDUs are used to reduce overhead, then transmission efficiency is improved, but access to wireless medium becomes less efficient in dense networks
Solution Approach 1:
The system dynamically adjusts between aggregated and non-aggregated transmission modes based on network density and traffic characteristics. In dense networks with small packets, non-aggregated PPDUs provide better medium access efficiency, while in less dense networks with large data transmissions, aggregated A-PSDU formats provide better transmission efficiency.
Solution Approach 2:
The system changes key transmission parameters such as PPDU duration, aggregation level, and Training Field placement to adapt to different network conditions, optimizing both transmission efficiency and wireless medium access efficiency for various scenarios.
Data Source
AI summary
For example, a wireless communication Station (STA) may be configured to generate a preamble of a Physical Layer (PHY) Protocol Data Unit (PPDU) according to a PPDU frame format. For example the STA may be configured to generate a data payload of the PPDU according to the PPDU frame format. For example, the data payload may include a plurality of data payload portions. For example, the PPDU may include a predefined Training Field (TF) between a first data payload portion and a second data payload portion of the plurality of data payload portions. For example, the STA may be configured to transmit the PPDU.