Dynamic Data Packet Transmission Rate Estimation

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Solution Overview

Problem

Current Car2Car and Car2X communication systems face inefficiencies due to vehicles transmitting data packets at maximum rates, leading to increased data packet collisions and channel congestion, reducing the probability of successful information transmission without feedback on reception quality.

Innovation Solution

A method to estimate the reception probability of data packets by determining signal quality based on antenna gain, transmission power, distance, and environmental factors, allowing for adjustment of transmission rates to achieve a predetermined threshold of successful information transmission without additional data load.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If vehicles transmit data packets at maximum transmission rate, then information delivery speed is improved, but data packet collisions increase and channel congestion occurs

Engineering Contradiction:

Improvetransmission rateVSAvoidsuccessful information transmission probability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The transmission rate is made dynamic rather than static. The system continuously adjusts the transmission rate based on real-time channel conditions and reception probability estimates, allowing the transmission rate to adapt to changing environmental conditions while maintaining reliable communication

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the transmission rate parameter based on estimated reception probability. By calculating the likelihood of successful packet reception and adjusting the transmission rate accordingly, the system optimizes both speed and reliability by transmitting faster when conditions are good and slower when conditions deteriorate

Inventive Principle:

Principle #35Parameter changes

2Productivity

If maximum transmission rate is used, then data transmission speed increases, but channel congestion and packet collisions worsen

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoiddata packet collisions

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The system implements feedback by estimating reception probability based on received signal strength indicator (RSSI) measurements and adjusting transmission rate accordingly. This feedback loop allows the system to learn from past transmissions and optimize future transmission rates to minimize collisions while maintaining high productivity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary estimation of reception probability before actual data transmission. By predicting the likelihood of successful reception in advance, the system can pre-adjust the transmission rate to avoid collisions before they occur, rather than reacting after collisions have happened

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3138221B1Estimating a data packet transmission rate

Publication Date: 2022.03.02 VOLKSWAGEN AG

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AI summary

In order to estimate the probability that a data packet wirelessly transmitted from a transmitter, which is a traffic infrastructure object or a vehicle (10), to a receiver will be received, the following steps are carried out: estimating a signal quality of the data packet; estimating the probability that the data packet will be received on the basis of the estimated signal quality.