Wireless USB Host Beacon Scheduling for Power and Interference

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Solution Overview

Problem

Wireless USB systems face significant power consumption and interference issues due to the periodic transmission of token packets and acknowledgement handshakes, which consume bandwidth and cause collisions when multiple devices attempt to transmit simultaneously.

Innovation Solution

A wireless USB host transmits a beacon designating network access times for each device, allowing them to remain in a low power state until their designated time, reducing power consumption and interference by scheduling data transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wireless USB devices transmit data periodically using token packets and acknowledgement handshakes, then data exchange between host and devices is achieved, but power consumption increases significantly

Engineering Contradiction:

Improvedata exchange reliabilityVSAvoiddevice power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system implements periodic beacon transmission from the host to schedule device access times. Devices wake up periodically at their designated access times to transmit data, then return to low power state. This periodic scheduling mechanism reduces overall power consumption while maintaining reliable data exchange.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The host transmits beacon packets in advance that contain scheduled access times for each device. Devices use this preliminary information to wake up only at their designated times, avoiding continuous operation and reducing power consumption while ensuring data exchange reliability.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If multiple wireless USB devices transmit data simultaneously, then data exchange efficiency improves, but interference and collisions increase

Engineering Contradiction:

Improvedata exchange efficiencyVSAvoidwireless interference and collisions

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The system segments the wireless medium access by assigning dedicated time slots to different devices through beacon scheduling. Each device transmits only during its designated access time, eliminating simultaneous transmissions and reducing interference while maintaining efficient data exchange through parallel time-division multiplexing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically allocates access times to devices based on their data exchange needs. The host can adjust scheduling in real-time through beacon updates, optimizing both productivity and interference reduction by adapting to changing traffic patterns.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9378177B2WiFi USB protocol

Publication Date: 2016.06.28 TEXAS INSTRUMENTS INC

AI summary

A wireless universal serial bus (USB) system that includes a wireless USB host, a first wireless USB device, and a second wireless USB device. The wireless USB host is configured to wirelessly transmit a beacon over a wireless USB network based on a wireless USB protocol. The first and second wireless USB devices are configured to exchange wireless packets with the wireless USB host. The beacon designates the wireless USB network address access times for the first and second wireless USB devices.