V2X Terminal Beam Power Control for Interference Protection

Solution Overview

Problem

Existing sidelink communications using beamforming technology in V2X communication cause significant interference to devices other than the communication partner, with no effective interference protection mechanisms in place.

Innovation Solution

A terminal device and method for V2X communication that incorporates interference protection mechanisms by controlling transmit beams to minimize interference to the base station and peripheral terminals through resource allocation, transmit power control, and beamforming adjustments based on interference feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If beamforming technology is used in sidelink communications, then communication efficiency and signal quality are improved, but interference to devices other than the communication partner increases significantly

Engineering Contradiction:

Improvesignal qualityVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by configuring different transmit power levels for different spatial directions. The base station determines direction-specific maximum transmit powers based on the spatial relationship between the terminal device, communication partner, and potential interference targets. This allows the terminal to transmit with higher power toward the intended recipient while limiting power in directions that would cause interference to other devices, thus achieving both high signal quality and low interference through spatially differentiated power control.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamics by making transmit power control adaptive and configurable rather than fixed. The base station dynamically configures direction-specific maximum transmit powers based on real-time spatial relationships and interference conditions. The terminal device can adjust its transmit power according to the configured parameters and actual communication needs, enabling flexible adaptation to changing environmental conditions while maintaining both communication quality and interference suppression.

Inventive Principle:

Principle #15Dynamics

2Reliability

If transmit power is increased to improve communication reliability, then signal quality improves, but interference to peripheral devices increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidinterference to peripheral devices

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by configuring different transmit power levels for different spatial directions. The base station determines direction-specific maximum transmit powers based on the spatial relationship between the terminal device, communication partner, and potential interference targets. This allows the terminal to transmit with higher power toward the intended recipient while limiting power in directions that would cause interference to other devices, thus achieving both high signal quality and low interference through spatially differentiated power control.

Inventive Principle:

Principle #3Local quality

3Use of energy by moving object

If beamforming is used to focus communication signals, then energy efficiency improves, but interference to the base station and peripheral terminals increases

Engineering Contradiction:

Improveenergy efficiencyVSAvoidinterference to base station and peripheral terminals

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by configuring different transmit power levels for different spatial directions. The base station determines direction-specific maximum transmit powers based on the spatial relationship between the terminal device, communication partner, and potential interference targets. This allows the terminal to transmit with higher power toward the intended recipient while limiting power in directions that would cause interference to other devices, thus achieving both high signal quality and low interference through spatially differentiated power control.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements feedback by having the base station monitor interference conditions and adjust the configured maximum transmit powers accordingly. The base station receives information about the spatial relationships and interference levels, then configures appropriate direction-specific power limits for terminal devices. This closed-loop feedback mechanism ensures that beamforming operations maintain energy efficiency while suppressing interference to the base station and peripheral terminals.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP3780670B1Terminal device, method, and recording medium

Publication Date: 2025.06.25 SONY GROUP CORP

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AI summary

[Problem] Provided is an interference protection mechanism for communications using a transmit beam in a sidelink. [Solution] A terminal device capable of communication using any communication method classified as vehicle-to-x (V2X) includes: an acquisition unit that acquires first information relating to allocation of a resource pool that can be used by a plurality of terminal devices using the communication method and second information relating to transmit power which is associated with a beam ID of one or a plurality of transmit beams which the terminal devices use in communication using the communication method; a parameter determination unit that determines parameters relating to the transmit beams on the basis of the first information and the second information; and a transmission processing unit that performs packet transmission processing using the communication method on the basis of the determined parameters.