Aircraft Relay Multiplexing for Out-of-Coverage Emergency Messages

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Solution Overview

Problem

Existing wireless communication systems struggle to efficiently relay emergency messages from user equipment outside network coverage areas, particularly in scenarios where traditional cellular coverage is unavailable.

Innovation Solution

Implementing a method and apparatus that utilize aircraft-based devices as mobile relays, enabling them to receive dynamic relay identifications and communicate discovery and response signals to facilitate emergency message relaying between user equipment and network entities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional cellular networks are used for emergency message relaying, then network infrastructure is required, but coverage is limited to areas with base stations

Engineering Contradiction:

Improveemergency message relaying reliabilityVSAvoidnetwork coverage area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent introduces aircraft-based devices as intermediary relay nodes between out-of-coverage user equipment and the cellular network. These aircraft relays receive emergency messages from terrestrial UEs and forward them to network entities, enabling coverage extension without requiring base stations in remote areas. The aircraft devices act as mobile mediators that bridge the gap between terrestrial users and the network infrastructure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system employs dynamic relay identification where the network assigns unique identifiers to aircraft relays based on their positions and coverage areas. The relay ID dynamically reflects the operational state and location of aircraft devices, allowing the network to manage multiple mobile relays efficiently. This dynamic approach enables flexible resource allocation and interference management as aircraft move through coverage areas.

Inventive Principle:

Principle #15Dynamics

2Area of stationary object

If multiple aircraft-based relays operate simultaneously, then coverage is extended, but interference between relays increases

Engineering Contradiction:

Improvecoverage areaVSAvoidinterference between relays

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent segments the communication resources by assigning dedicated time slots and frequency resources to different aircraft relays. Each relay is allocated specific resources for transmitting discovery signals and relaying emergency messages, preventing simultaneous transmissions that would cause interference. This segmentation allows multiple aircraft to operate in the same geographic area without mutual interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Aircraft relays transmit discovery signals before receiving emergency messages to preemptively establish their presence and claimed resources. By announcing their operational status and allocated resources in advance, relays prevent resource conflicts and interference before they occur. The network uses these preliminary discovery signals to coordinate and schedule emergency message relaying operations.

Inventive Principle:

Principle #10Preliminary action

3Difficulty of detecting and measuring

If aircraft relays transmit discovery signals continuously, then user equipment can locate them, but energy consumption increases

Engineering Contradiction:

Improverelay detection capabilityVSAvoidaircraft relay energy consumption

Core Design Contradiction:

Difficulty of detecting and measuringVSUse of energy by moving object

Solution Approach 1:

Instead of continuous transmission, aircraft relays send discovery signals periodically at predetermined intervals. This periodic transmission pattern allows user equipment to detect and locate relays while significantly reducing energy consumption compared to continuous operation. The network configures appropriate transmission intervals based on mobility patterns and coverage requirements, balancing detectability with power efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system enables user equipment to actively search for and detect aircraft relays using their own resources rather than relying solely on continuous broadcast signals from relays. Terrestrial UEs perform discovery procedures by monitoring for relay signals and calculating positions based on signal characteristics, reducing the burden on relay devices to continuously transmit at high power levels.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250351050A1Multiplexing and diversity for multi-aircraft emergency message relaying

Publication Date: 2025.11.13 QUALCOMM INC

AI summary

A method of wireless communication by an aircraft-based device includes receiving a dynamic relay identification (ID). The method also includes communicating a discovery signal with resources mapped to the relay ID. The method further includes communicating a response signal with the resources mapped to the relay ID. A method for wireless communication by a network device includes estimating a position of each of a number of aircraft-based devices. The method also includes transmitting a dynamic relay identification (ID) to each of the aircraft-based devices based on the respective estimated position relative to an out-of-coverage area.