Grant-Free Emergency Notification Transmission in V2X

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Solution Overview

Problem

Current wireless communication networks face challenges in achieving ultra-reliable low latency communications, particularly in emergency notification scenarios for V2X or D2D user equipment, due to latency caused by scheduling and access granting, which is not adequately addressed by existing technologies.

Innovation Solution

The implementation of a transceiver configured to transmit emergency notifications using a guard resource or reference symbols within the wireless communication system, with the option to increase transmit power beyond the maximum allowed power, allowing for grant-free access and immediate notification in critical situations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional scheduling and access granting procedures are used for emergency notifications, then network resource management is maintained, but transmission latency increases

Engineering Contradiction:

Improveemergency notification deliveryVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system pre-configures grant-free transmission resources and emergency notification parameters in advance, allowing UEs to immediately transmit emergency notifications without waiting for scheduling grants. This preliminary setup enables instant transmission while the network maintains overall resource management through pre-defined resource pools.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a grant-free transmission mechanism as an intermediary channel that bypasses the traditional scheduling grant process for emergency notifications. This intermediary path allows direct transmission while the network core still manages resources through pre-configured parameter sets and resource pools.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If transmit power is increased beyond maximum allowed power, then notification signal detectability improves, but regulatory compliance and interference control deteriorate

Engineering Contradiction:

Improvesignal detection accuracyVSAvoidinterference and regulatory compliance

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The system applies different transmit power levels locally based on the transmission type: maximum allowed power for normal communications, but higher power specifically for emergency notifications. This localized power adjustment ensures emergency signals are detectable while maintaining regulatory compliance for general operations.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the transmit power parameter dynamically based on the notification type. For emergency notifications, the system temporarily allows transmit power to exceed maximum allowed power levels, while maintaining normal power constraints for regular communications. This parameter change enables better signal detection for critical messages.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If guard resources and reference symbols are used for notification transmission, then transmission reliability improves, but available resources for other communications decrease

Engineering Contradiction:

Improvenotification transmission reliabilityVSAvoidavailable communication resources

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system uses guard resources and reference symbols partially - only when emergency notifications need to be transmitted. These resources are not continuously occupied but are available for normal communications during non-emergency periods, thus maintaining resource availability while ensuring reliability when needed.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements periodic monitoring of emergency conditions, where guard resources and reference symbols are utilized for emergency notifications only when detected as necessary. This periodic approach ensures high reliability for emergency transmissions while leaving resources available for regular communications during normal operation.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11589321B2Emergency notification requesting spontaneous grant free transmission for V2X

Publication Date: 2023.02.21 FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV

AI summary

Embodiments provide a user equipment for a wireless communication system. The user equipment is configured to communicate with at least one other user equipment of the wireless communication system using a sidelink resource pool of the wireless communication system. Further, the user equipment is configured to transmit, responsive to an external emergency situation, an emergency notification signal on a resource of the wireless communication system. Thereby, the user equipment is configured to transmit the emergency notification signal with a transmit power that is greater than a regular transmit power used by the user equipment for transmitting regular signals.