DRU Uplink 4×LTF Guard Interval Tuning for Higher Throughput

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The IEEE 802.11 standard's high-efficiency and extremely high throughput modes face challenges with high overhead and lower throughput due to the use of a 3.2 μs guard interval for transmitting the full set of long training field tones, which is not suitable for distributed resource units (DRUs) and results in inefficient data transmission.

Innovation Solution

Implementing a 4×LTF mode with guard intervals less than 3.2 μs, such as 1.6 μs or 0.8 μs, to transmit the full set of tones, reducing overhead and increasing throughput for DRUs in UL OFDMA transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a 3.2 μs guard interval is used for transmitting the full set of long training field tones, then training accuracy is improved, but overhead increases and throughput decreases

Engineering Contradiction:

Improvetraining accuracyVSAvoidthroughput

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent changes the guard interval parameter from the conventional 3.2 μs to shorter values (1.6 μs or 0.8 μs) while maintaining 4×LTF mode, thereby reducing overhead and improving throughput while preserving training accuracy through alternative means

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses 4×LTF mode to transmit the full set of long training field tones, which is more than the minimum required (1×LTF), thereby ensuring adequate training accuracy even with reduced guard interval

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If a 3.2 μs guard interval is used, then signal reliability is improved, but data transmission efficiency deteriorates

Engineering Contradiction:

Improvesignal reliabilityVSAvoiddata transmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the guard interval parameter to reduce overhead and improve data transmission efficiency, while maintaining signal reliability through the use of 4×LTF mode and other compensation mechanisms

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If 4×LTF mode is used with 3.2 μs guard interval, then training completeness is improved, but overhead increases

Engineering Contradiction:

Improvetraining completenessVSAvoidoverhead

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent changes the guard interval parameter to reduce overhead while maintaining 4×LTF mode to ensure training completeness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses 4×LTF mode to transmit the full set of long training field tones, which is more than the minimum required, thereby ensuring training completeness even with reduced guard interval

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20260039523A1GUARD INTERVAL (GI) AND LONG TRAINING FIELD (LTF) OPTION FOR DISTRIBUTED RESOURCE UNITS (DRUs)

Publication Date: 2026.02.05 MAXLINEAR INC

AI summary

A station (STA) may include a processing device. The processing device may select, at a STA for transmission to an access point (AP), a long training field (LTF) mode in which the LTF mode is 4×LTF. The processing device may select, at the STA for the transmission to the AP, a first guard interval having a value of less than 3.2 μs in which the first guard interval is used for one or more of training symbols or data symbols. The STA may include a transceiver. The transceiver may transmit, from the STA to the AP, the transmission using the LTF mode and the first guard interval. The transceiver may transmit, from the STA to the AP, the transmission using one or more distributed resource units (DRUs).