D2D Communication with Omnidirectional Antenna Phase Matching

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Solution Overview

Problem

D2D communication systems face challenges in establishing smooth connections when multiple devices are nearby, leading to delays and potential disconnections due to the use of directional antennas and changing device positions.

Innovation Solution

A D2D communication system using omnidirectional antennas to transmit connection requests with phase difference information, allowing devices to calculate and respond only when the phase difference meets a threshold, enabling directional connections without actual directional antennas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If directional antennas are used to establish connections in specific directions, then connection directionality is improved, but device complexity increases

Engineering Contradiction:

Improveconnection directionalityVSAvoidantenna system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the omnidirectional antenna system into multiple virtual directional beams by applying different phase differences to signals transmitted through different antenna elements. This allows the system to achieve directional communication functionality without requiring physical directional antennas, thereby maintaining hardware simplicity while improving connection directionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the phase parameter of the transmitted signal for each antenna element to create directional beam patterns. By adjusting the phase difference between signals from different antenna elements, the system can steer communication beams in specific directions without changing the physical antenna structure, thus achieving directional communication with omnidirectional antennas.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If connection requests are transmitted to all neighboring devices, then connection coverage is improved, but communication delay increases

Engineering Contradiction:

Improveconnection coverageVSAvoidcommunication delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent incorporates direction information (phase difference) into the connection request signal in advance. This allows receiving devices to pre-calculate whether they match the intended communication direction before fully processing the connection request, enabling faster filtering and reducing the time required to establish connections while maintaining coverage.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses the phase difference information as a feedback mechanism where the transmitting device specifies the intended direction, and receiving devices use this information to determine whether to respond. This feedback loop enables receiving devices to quickly identify relevant connection requests without processing all requests, reducing communication delay while maintaining comprehensive coverage.

Inventive Principle:

Principle #23Feedback

3Productivity

If omnidirectional antennas transmit connection requests with phase difference information, then connection establishment speed is improved, but signal processing complexity increases

Engineering Contradiction:

Improveconnection establishment speedVSAvoidsignal processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses software-based signal processing to create virtual directional beams by applying phase shifts to signals from omnidirectional antennas. Instead of requiring complex hardware modifications, the system copies and processes signals through different phase configurations, achieving directional communication functionality through software algorithms that manage the increased processing complexity.

Inventive Principle:

Principle #26Copying

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables simultaneous connections with multiple devices in specific directions using omnidirectional antennas, ensuring stable data exchange and reducing disconnections.

Implementation Method 1

transmit a connection request, including a reception phase difference, in the same radio signal through at least two omnidirectional antennas spaced a certain distance from each other

Methodology Applied

Scientific EffectPhase difference:

Implementation Method 2

calculate a phase difference between the two radio signals, establish a connection in response to the connection request only when a difference between the calculated phase difference and the reception phase difference included in the connection request is equal to or less than a set threshold

Methodology Applied

Scientific EffectPhase difference calculation:

Data Source

PatentUS12414179B2Device to device communication system

Publication Date: 2025.09.09 OWLYNK CO LTD

AI summary

Provided is a device-to-device (D2D) communication system for communication between a plurality of devices by a peer-to-peer (P2P) method, wherein, when a transmitting device transmits a connection request, which includes a reception phase difference, in the same radio signal through at least two omnidirectional antennas spaced a certain distance from each other, a receiving device located near the transmitting device receives the connection request, calculate a phase difference of the radio signal, and establish a connection in response to the connection requests only when a difference between the calculated phase difference and the reception phase difference included in the connection request is equal to or less than a set threshold.