Multidimensional Beam Refinement Signaling for mmWave WLANs

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Solution Overview

Problem

Existing millimeter wave WLAN systems face inefficiencies in beam refinement procedures and signaling, particularly in multi-dimensional transmissions, leading to increased overhead and potential channel interference due to the limitations of single beam transmission protocols.

Innovation Solution

Implementing multidimensional beam refinement procedures and enhanced signaling methods that extend the BRP MAC packet and PPDU format to support multiple transmit-receive beam pairs, polarizations, or channels, while optimizing interframe spacing to reduce overhead and improve channel access efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If single beam transmission protocols are used for beam refinement, then protocol simplicity is maintained, but signaling overhead increases and channel access efficiency decreases

Engineering Contradiction:

Improveprotocol complexityVSAvoidsignaling overhead

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The beam refinement protocol is segmented into multiple independent dimensions (first dimension and second dimension), each handling specific beam pairs. This segmentation allows parallel processing of beam refinement operations, reducing total signaling time and overhead while maintaining protocol manageability through modular structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces multi-dimensional beam refinement by adding a second dimension to the traditional single-beam protocol. This dimensional expansion enables simultaneous refinement of multiple beam pairs across different spatial dimensions, effectively reducing signaling overhead through parallel operations without proportionally increasing protocol complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If single beam transmission protocols are used, then implementation simplicity is maintained, but channel access efficiency decreases

Engineering Contradiction:

Improveimplementation simplicityVSAvoidchannel access efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

Multiple beam refinement operations are merged into a single coordinated protocol execution. By combining operations across different beam pairs and dimensions into a unified process with shared resources, the system achieves improved channel access efficiency while maintaining implementation simplicity through consolidated control logic.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The protocol incorporates dynamic resource allocation and adaptive timing mechanisms that adjust beam refinement operations based on real-time channel conditions. This dynamic approach optimizes channel access efficiency by activating only the necessary beam pairs at optimal times, while maintaining implementation simplicity through automated adaptation rather than complex manual configuration.

Inventive Principle:

Principle #15Dynamics

3Reliability

If multidimensional beam refinement is implemented, then beam refinement performance improves, but signaling overhead increases

Engineering Contradiction:

Improvebeam refinement performanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The beam refinement protocol is designed with multi-functionality to handle multiple beam pairs and dimensions through a unified signaling framework. This universal approach allows the same protocol structure to serve multiple purposes (different beam pairs, polarizations, channels) without requiring separate signaling for each, thereby improving beam refinement performance while controlling signaling overhead growth.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent utilizes parameter changes in the signaling protocol to efficiently encode multidimensional beam refinement information. By dynamically adjusting signaling parameters (such as beam pair indices, dimension identifiers, and timing offsets) rather than adding proportional bits to the signaling message, the system achieves improved beam refinement performance with minimal increase in signaling overhead.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12451948B2Multidimensional beam refinement procedures and signaling for mmWave WLANs

Publication Date: 2025.10.21 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Systems and methods for multidimensional beam refinement procedures and signaling for millimeter wave WLANs. In some embodiments, there are multi-dimensional enhanced beam refinement protocol MAC and PHY frame designs that extend the MAC packet and the PPDU format with or without backwards compatibility. The multiple dimensions may be supported jointly or separately. In other embodiments, the increased data signaled in the eBRP frame designs may be more efficiently signaled with reduced BRP frame sizes, such as through a training type dependent BRP minimum duration selection procedure or use of null data packet BRP frames. In further embodiments, the maximum duration of the interframe spacing between BPR packets may be varied to improve the efficiency of BRP operation.