Beacon Signal Interference Handling for D2D Communication

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Solution Overview

Problem

Existing D2D communication technologies face challenges in initiating communication between wireless devices when no single channel is available that is interference-free for both devices, leading to limited options for beacon signaling.

Innovation Solution

A method where a wireless device sends a beacon signal on a channel it is interfered with, indicating that no response should be sent on that channel, allowing for the use of previously unusable interfered channels for communication, and providing information on non-interfered channels for response and data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If devices select beacon channels to avoid collisions, then channel access reliability is improved, but the number of usable channels is reduced when interference scenarios differ between devices

Engineering Contradiction:

Improvebeacon channel access reliabilityVSAvoidnumber of usable channels

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Instead of avoiding interfered channels, the patent inverts the approach by deliberately selecting interfered channels for beacon transmission. The beacon signal includes a flag indicating that the channel is interfered and that no response should be sent on this channel, thereby turning the harmful interference into a usable resource for device discovery.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent converts the harmful interference on a channel into a beneficial feature by using the interference flag in the beacon signal to inform receiving devices that the channel is interfered but still usable for beacon purposes. This transforms what was previously a unusable channel into a valid option for D2D communication initiation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If devices transmit beacons on interference-free channels, then transmission quality is improved, but communication initiation fails when no common interference-free channel exists

Engineering Contradiction:

Improvebeacon transmission qualityVSAvoidD2D communication initiation success

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent inverts the traditional beacon selection strategy by allowing devices to transmit beacons on interfered channels rather than requiring interference-free channels. The beacon signal carries information about the interference status, enabling receiving devices to understand and accommodate the interference condition.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the parameter of channel selection from requiring interference-free conditions to accepting interfered channels. By modifying the beacon signal structure to include interference indication flags, the system enables communication initiation in previously inaccessible interference scenarios.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9686666B2Method and arrangement for handling D2D communication

Publication Date: 2017.06.20 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method in a first wireless device for handling Device to Device, D2D, communication between the first wireless device and a second wireless device is provided. The first wireless device sends a beacon signal to be received by the second wireless device. The beacon signal announces that the first wireless device is available for D2D communication. The beacon signal is sent on a first channel where the first wireless device is interfered. The beacon signal indicates that no response to the beacon signal shall be sent on the first channel.