PC5 Transmit Power Control for Dense-Area V2X Communication

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Solution Overview

Problem

V2X communication systems face issues with limited resources, large latency, and packet loss due to high data volume, especially in densely populated areas, leading to deteriorated communication performance and potential misidentification of risk areas, with the server often bearing the liability for accidents.

Innovation Solution

A V2X communication method that adjusts the transmit power of the PC5 interface based on UE density information, using global information to determine the transmit power adjustments, thereby improving communication quality and reducing power consumption while avoiding server liability for accidents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the V2X server sends V2X messages at high frequency (up to 50 Hz) to improve communication quality, then communication reliability is improved, but network resource consumption increases and latency increases

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidlatency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements dynamic transmit power adjustment based on UE density information. The network element receives UE density information and dynamically configures different transmit power levels for the PC5 interface according to the current UE density, allowing the system to adapt communication parameters in real-time rather than using fixed high-frequency transmission

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the communication parameter from fixed high-frequency transmission to variable transmit power levels. By adjusting the transmit power configuration information based on UE density, the system optimizes resource usage while maintaining communication reliability, avoiding the need for constant high-frequency messaging

Inventive Principle:

Principle #35Parameter changes

2Area of stationary object

If the V2X server sends large volume of data to improve communication coverage, then communication coverage is improved, but network resource consumption increases and packet loss increases

Engineering Contradiction:

Improvecommunication coverageVSAvoiddata volume

Core Design Contradiction:

Area of stationary objectVSQuantity of substance

Solution Approach 1:

The patent applies local quality by adjusting transmit power based on local UE density conditions. Different areas with different UE densities receive different transmit power configurations, optimizing resource usage locally rather than uniformly across the entire network coverage area

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system dynamically adjusts transmit power levels according to real-time UE density information, allowing communication coverage to be optimized without consistently using large data volumes. The network element configures appropriate power levels based on current network conditions

Inventive Principle:

Principle #15Dynamics

3Reliability

If the transmit power of PC5 interface is increased to improve communication quality, then communication reliability is improved, but power consumption of UE increases

Engineering Contradiction:

Improvecommunication qualityVSAvoidpower consumption of UE

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the fixed transmit power parameter to a dynamic parameter that adjusts based on UE density. The network element provides transmit power configuration information that optimizes power usage while maintaining communication quality, avoiding unnecessary high power consumption in low-density areas

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses feedback from UE density information to adjust transmit power levels. The network element receives UE density information and configures appropriate power levels, creating a feedback loop that optimizes power consumption while maintaining communication quality

Inventive Principle:

Principle #23Feedback

4Speed

If the V2X server determines risk areas using local information only, then response speed is improved, but measurement precision deteriorates due to lack of global information

Engineering Contradiction:

Improveresponse speedVSAvoidrisk area identification accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent introduces a network element as an intermediary that collects and processes global UE density information. This intermediary aggregates information from multiple sources and provides comprehensive transmit power configuration to UEs, improving risk area identification accuracy without significantly impacting response speed

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12574864B2V2X communication method and apparatus

Publication Date: 2026.03.10 HUAWEI TECH CO LTD

AI summary

The technology of this application relates to a V2X communication method and an apparatus. The method includes a first network element obtains UE density information of a first area in which target UE is located, and the first network element sends first information to the target UE based on the UE density information, where the first information is used by the target UE to adjust transmit power of a PC5 interface. The method provided in this application can improve V2X communication quality, and further reduce power consumption of UE. In addition, it can also be avoided that primary responsibility of an accident is transferred to a server, and information received by the UE is determined using global information, so that an error can be reduced.