Air-to-Ground Dedicated RACH Configuration for Wireless Access

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently configuring air-to-ground dedicated random access channels (RACH) for air-to-ground communications, leading to interference and resource starvation issues, particularly in scenarios involving airborne user equipment (UEs) and ground base stations.

Innovation Solution

The implementation of an air-to-ground dedicated RACH configuration, which includes specific parameters such as a higher reference signal received power (RSRP) threshold and dedicated RACH occasions, is introduced to improve the efficiency and reliability of random access procedures for airborne UEs, reducing interference from non-airborne UEs and optimizing resource usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a shared RACH configuration is used for both ground and airborne UEs, then resource utilization is efficient, but interference and resource starvation occur for airborne UEs

Engineering Contradiction:

Improverandom access reliability for airborne UEsVSAvoidinterference and resource starvation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The RACH configuration is segmented into separate dedicated configurations for airborne UEs and ground UEs. The base station transmits distinct RACH parameter sets that allow airborne UEs to access specific RACH occasions without competing with ground UEs, thereby eliminating interference and resource starvation while maintaining overall system efficiency.

Inventive Principle:

Principle #1Segmentation

2Productivity

If RACH parameters are optimized for ground UEs, then ground communication performance is good, but airborne UE access fails due to mismatched parameters

Engineering Contradiction:

Improvecommunication throughputVSAvoidadaptability to different UE types

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

Different RACH parameter sets are configured with local quality optimized for specific UE types. Airborne UE-specific parameters include higher RSRP thresholds and dedicated RACH occasions suited for aerial mobility, while ground UE parameters maintain original optimization. This allows each UE type to achieve optimal performance without compromising the other.

Inventive Principle:

Principle #3Local quality

3Reliability

If dedicated RACH resources are allocated for airborne UEs, then airborne access reliability improves, but system complexity increases

Engineering Contradiction:

Improveairborne UE random access reliabilityVSAvoidRACH configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The RACH configuration system dynamically adapts to UE type through automated identification and parameter selection. When an airborne UE initiates access, the base station automatically selects the appropriate airborne-specific RACH parameter set, eliminating manual configuration complexity while ensuring reliable airborne access. The system transitions from static shared configuration to dynamic type-specific configuration.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20240179756A1Air-to-ground dedicated random access channel configuration design for wireless air-to-ground communications

Publication Date: 2024.05.30 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, an indication of an air-to-ground (ATG) dedicated random access channel (RACH) configuration. The UE may communicate with the base station based at least in part on the ATG dedicated RACH configuration. Numerous other aspects are described.