NR Random Access Reporting for Long-Preamble Subcarrier Spacing

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Solution Overview

Problem

Existing 3GPP TS standards for New Radio (NR) wireless networks are limited in their ability to fully report random access (RA) resource information, particularly for long preambles, due to restrictions in the subcarrier spacing field notation, which hinders network optimization and leads to inefficiencies such as increased collision probability and energy consumption.

Innovation Solution

The solution involves extending the msg1-SubcarrierSpacing field to include 1.25 kHz and 5 kHz subcarrier spacings for long preambles, and introducing an OffsetToCarrier field to report the frequency offset between Point A and the lowest usable subcarrier, allowing complete RA resource reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the subcarrier spacing field in RA information common element is restricted to conventional values, then the device complexity and standard compatibility are maintained, but the RA resource reporting completeness and network optimization capability are limited

Engineering Contradiction:

ImproveRA resource reporting capabilityVSAvoidfield notation complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extends the subcarrier spacing field to include new values (1.25 kHz and 5 kHz) beyond the conventional restrictions, allowing the system to adapt to long preamble requirements while maintaining the same field structure. This parameter extension enables complete RA resource reporting without increasing device complexity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If complete RA resource information is not reported, then the signaling overhead is reduced, but the collision probability and energy consumption increase

Engineering Contradiction:

ImproveRA procedure success rateVSAvoidUE energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent enables complete RA resource information feedback by extending the subcarrier spacing field, allowing the network to fully understand and optimize RA资源配置. This complete feedback mechanism reduces RA procedure failures, collisions, and unnecessary retransmissions, thereby reducing UE energy consumption.

Inventive Principle:

Principle #23Feedback

3Ease of manufacture

If the subcarrier spacing field does not support 1.25 kHz and 5 kHz values, then the standard simplicity is maintained, but the long preamble RA resource management is hindered

Engineering Contradiction:

Improvestandard implementation easeVSAvoidRA resource information completeness

Core Design Contradiction:

Ease of manufactureVSLoss of information

Solution Approach 1:

The patent adds a new dimension to the subcarrier spacing field by incorporating 1.25 kHz and 5 kHz values, enabling the field to represent a broader range of RA resource configurations. This dimensional extension allows complete reporting of long preamble RA resources while maintaining standard implementation simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentEP4152876B1Communication devices and methods for random access reporting

Publication Date: 2025.12.24 APPLE INC

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AI summary

The present application relates to devices and components including apparatus, systems, and methods for reporting random access configuration information in wireless networks.