Dynamic Subband Sounding for Beamforming Under Interference

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in spectrum usage and interference management, particularly in environments with varying traffic loads and interference levels, and lack flexibility in adapting to changing conditions, impacting signal quality and compatibility with legacy devices.

Innovation Solution

Implementing Dynamic Subband Operation (DSO) to dynamically adjust subband allocation based on interference, traffic load, and environmental conditions, enabling single-user beamforming and multi-user MIMO operations, with mechanisms for sounding sequences during DSO transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If Dynamic Subband Operation is implemented to adaptively allocate bandwidth, then spectral efficiency and signal quality improve, but device complexity and protocol overhead increase

Engineering Contradiction:

Improvespectral efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements dynamic subband operation where the AP can flexibly allocate different bandwidth portions (20MHz, 40MHz, 80MHz) to STAs based on real-time channel conditions, traffic load, and interference levels. This dynamic allocation allows the system to adapt spectrum usage patterns continuously, improving spectral efficiency while managing device complexity through automated resource management

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters including bandwidth allocation size, subcarrier spacing, and cyclic prefix length based on channel conditions. By dynamically adjusting these parameters, the system optimizes spectral efficiency for different transmission scenarios while maintaining compatibility through standardized parameter sets defined in the protocol

Inventive Principle:

Principle #35Parameter changes

2Productivity

If bandwidth is increased for high data rates, then throughput improves, but susceptibility to interference and signal quality deteriorate

Engineering Contradiction:

ImprovethroughputVSAvoidinterference susceptibility

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the total bandwidth into multiple subbands (e.g., dividing 80MHz into four 20MHz subbands). The AP can allocate different subbands to different STAs or use them for different purposes (data transmission, sounding, reference signals). This segmentation allows the system to achieve high throughput by aggregating multiple subbands while reducing interference susceptibility by selecting subbands with favorable channel conditions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different subbands are allocated based on their local channel quality characteristics. The AP assesses channel conditions for each subband and allocates resources accordingly, placing high-throughput requirements on subbands with good signal quality and using subbands with poorer conditions for less demanding transmissions or for sounding purposes

Inventive Principle:

Principle #3Local quality

3Reliability

If sounding sequences are performed for beamforming, then signal quality and reliability improve, but transmission time and protocol overhead increase

Engineering Contradiction:

Improvesignal qualityVSAvoidtransmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs sounding sequences in advance before actual data transmission to establish channel state information and optimize beamforming parameters. By conducting sounding during idle periods or before traffic bursts, the system prepares beamforming weights and channel knowledge beforehand, ensuring high signal quality during data transmission while minimizing the impact on overall throughput

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent combines multiple functions into unified transmissions. For example, sounding references signals (RS) are integrated with data transmissions, and beamforming training is combined with channel sounding. This merging reduces the total time required by eliminating separate transmission phases and allows simultaneous optimization of multiple parameters

Inventive Principle:

Principle #5Merging (Combining)

4Productivity

If new wireless standards are introduced for improved performance, then spectral efficiency and reliability improve, but compatibility with legacy devices becomes challenging

Engineering Contradiction:

Improvespectral efficiencyVSAvoidlegacy compatibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent designs the DSO mechanism to be universally applicable across different device types and wireless standards. The AP can dynamically allocate bandwidth and configure transmission parameters while maintaining compatibility with legacy STAs that cannot utilize advanced features. Legacy devices can operate on allocated subbands using standard protocols, while advanced devices can exploit the full dynamic allocation capabilities, allowing the system to serve multiple device generations simultaneously

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4657769A1Sounding with dynamic subband operation

Publication Date: 2025.12.03 INTEL CORP

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AI summary

This disclosure describes systems, methods, and devices related to dynamic subband. A device may perform a dynamic subband operation, DSO, initial phase. The device may generate a sequence of sounding messages to be used after the DSO initial phase. The device may perform the sequence of sounding messages while operating on a secondary channel. The device may initiate a beam forming report poll (BFRP) trigger frame (TF) as part of the sequence of sounding message.