Probe-Before-Talk Wi-Fi Coexistence Mechanism

Solution Overview

Problem

Current wireless local area network (WLAN) devices face challenges in managing multiple Wi-Fi interfaces and coexistence with other technologies, leading to reduced transmission rates due to collisions and inefficient resource allocation.

Innovation Solution

The implementation of a Probe-Before-Talk (PBT) mechanism that allows for the setup, session management, and termination of Wi-Fi multiple interfaces and coexistence with other technologies, enabling either a wireless station or access point to initiate a transmit opportunity, and using modified Clear-to-Send (CTS) frames with future unavailability profiles to optimize resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If radio resources are dynamically time shared between infrastructure Wi-Fi connection, P2P connection, and co-existing radio access technologies, then multiple interfaces and technologies can coexist, but communications may collide leading to reduced transmission rate

Engineering Contradiction:

Improvemulti-interface and multi-technology coexistenceVSAvoidtransmission rate

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent implements a Probe-Before-Talk (PBT) mechanism where devices perform channel probing and reservation before actual data transmission. The initiator sends a Probe frame, and the responder replies with a Response frame containing a reserved time window. This preliminary action secures the channel in advance, preventing collisions with other transmissions and ensuring high transmission rates when the actual talk phase occurs.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If multiple Wi-Fi interfaces and co-existing technologies share the same radio link, then device functionality is enhanced, but resource allocation efficiency decreases due to collisions

Engineering Contradiction:

Improveinterface and technology functionalityVSAvoidresource allocation efficiency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the wireless communication process into distinct phases: Probe phase, Response phase with reserved time window, and Talk phase. By dividing the channel access into these segmented stages with clear boundaries, the system allows multiple interfaces and technologies to operate in an organized manner without interfering with each other, thus improving resource allocation efficiency while maintaining multi-functionality.

Inventive Principle:

Principle #1Segmentation

3Speed

If transmit opportunities are initiated without prior channel probing, then transmission speed is faster, but collision probability increases reducing reliability

Engineering Contradiction:

Improvetransmission speedVSAvoidtransmission reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent implements a Probe-Before-Talk (PBT) mechanism where devices perform channel probing and reservation before actual data transmission. The initiator sends a Probe frame, and the responder replies with a Response frame containing a reserved time window. This preliminary action secures the channel in advance, preventing collisions with other transmissions and ensuring high transmission rates when the actual talk phase occurs.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240188133A1Methods for Wi-Fi Infrastructure Network and P2P Connection/Co-existence Technology Management

Publication Date: 2024.06.06 APPLE INC

AI summary

Systems, methods, and mechanisms for a Probe-Before-Talk (PBT) to manage the operation of Wi-Fi multiple interfaces and/or Wi-Fi co-existence with other technologies. Further, embodiments described herein relate to systems, methods, and mechanisms for PBT setup, a PBT session, and PBT termination. The systems, methods, and mechanisms described herein may support either a wireless station or an access point as an initiator of a transmit opportunity.