Reduced-Preamble Preemption PPDU Format for Higher WLAN Throughput

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Solution Overview

Problem

The preemption scheme in IEEE 802.11 wireless networks, which divides large PPDUs into smaller PPDUs with predefined IFS intervals, is hindered by significant preamble overhead, reducing overall throughput.

Innovation Solution

Implementing a PPDU format where only the first transmitted PPDU includes a complete preamble, and subsequent PPDUs have reduced preambles, leveraging information from the first PPDU to process subsequent PPDUs, thereby reducing unnecessary preamble repetition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If each preemption PPDU includes a complete preamble to ensure proper signal processing and synchronization, then reliability of data reception is improved, but preamble overhead increases reducing overall throughput

Engineering Contradiction:

Improvedata reception reliabilityVSAvoidoverall throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent extracts and removes redundant preamble fields from subsequent preemption PPDUs, keeping only the essential shortened preamble components while eliminating duplicate information that is already present in the first PPDU's complete preamble, thereby reducing overhead without compromising essential signal processing

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The complete preamble of the first PPDU serves multiple functions: it provides synchronization, channel estimation, and signal detection information that can be reused for processing subsequent preemption PPDUs, eliminating the need for each PPDU to carry identical preamble information

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of time

If a large PPDU is divided into multiple smaller preemption PPDUs to enable low latency transmissions and preemption, then latency is reduced, but preamble overhead increases reducing overall throughput

Engineering Contradiction:

Improvetransmission latencyVSAvoidoverall throughput

Core Design Contradiction:

Loss of timeVSProductivity

Solution Approach 1:

The patent segments the preamble structure into two parts: a complete preamble for the first PPDU and a shortened preamble for subsequent PPDUs, allowing the data to be divided into multiple preemption PPDUs while reducing the overhead portion of each segment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the parameter of preamble length from constant (complete preamble in every PPDU) to variable (complete preamble in first PPDU, shortened preamble in subsequent PPDUs), optimizing the balance between reliability and throughput

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12495328B2Physical layer protocol data unit (PPDU) format for reducing preamble overhead of preemption PPDUs

Publication Date: 2025.12.09 NEWRACOM INC

AI summary

An embodiment is method performed by a wireless device to allow preemption in a wireless network. The method includes wirelessly transmitting a first preemption physical layer protocol data unit (PPDU) that includes a complete preamble followed by one or more subsequent preemption PPDUs that each include a reduced preamble, wherein the complete preamble includes one or more preamble fields that are omitted in the reduced preamble, wherein the first PPDU and the one or more subsequent preemption PPDUs are transmitted with a predefined interframe space interval between PPDU transmissions during which preemption is allowed.