RACH Occasion Configuration for Wireless Access

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently determining time-frequency resources for RACH Occasions in both two-step and four-step random access procedures, particularly in minimizing channel accesses and managing resource conflicts.

Innovation Solution

A method and system for a network device to transmit a RACH Occasion configuration to a terminal device, which includes separate time and frequency resource indications for two-step and four-step random access procedures, allowing the terminal device to transmit RACH preambles accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If separate time-frequency resources are allocated for two-step and four-step random access procedures, then resource conflicts are reduced and access efficiency is improved, but device complexity and configuration complexity increase

Engineering Contradiction:

Improverandom access efficiencyVSAvoidconfiguration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the random access resources by separating time-frequency resources for two-step and four-step procedures. Specifically, it allocates different RACH Occasions and PUSCH resources for each procedure type, preventing resource conflicts and improving access efficiency by ensuring dedicated resources for each random access method

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces additional configuration parameters and dimensions to the resource allocation system. It adds separate time resource indications, frequency resource indications, and PUSCH resource configurations for two-step and four-step procedures, creating a multi-dimensional resource space that resolves conflicts between different random access procedures

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If shared time-frequency resources are used for both two-step and four-step random access procedures, then device complexity is reduced, but resource conflicts increase and access latency increases

Engineering Contradiction:

Improveconfiguration complexityVSAvoidaccess latency

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary resource allocation and configuration before random access occurs. By pre-defining separate time-frequency resources and PUSCH configurations for both two-step and four-step procedures, the system eliminates the need for dynamic resource negotiation during access, thereby reducing latency

Inventive Principle:

Principle #10Preliminary action

3Reliability

If dedicated PUSCH resources are configured for two-step random access, then transmission reliability is improved, but resource overhead and system complexity increase

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent applies local quality by providing dedicated PUSCH resource configurations specifically for two-step random access where needed, rather than uniformly across all procedures. The configuration includes specific frequency offsets, resource block allocations, and modulation schemes optimized for two-step access scenarios, improving reliability only where the enhanced procedure is utilized

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes key parameters including frequency offset configurations, resource block allocations, and modulation schemes for PUSCH transmissions in two-step random access. By adjusting these parameters specifically for two-step procedures, the system achieves higher transmission reliability while managing resource overhead through targeted rather than universal parameter changes

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12267879B2Network device, terminal device, and methods therein

Publication Date: 2025.04.01 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method of transmitting a Random Access Channel (RACH) Occasion configuration to a terminal device and receiving a RACH preamble according to the RACH Occasion configuration. The RACH Occasion configuration comprises a first time resource indication identifying a first set of time resources in which the terminal device is allowed to transmit a RACH preamble according to a first random access procedure, a first frequency resource indication identifying at least a first set of frequency resources in which the terminal device is allowed to transmit the RACH preamble, a second time resource indication identifying a second set of time resources in which the terminal device is allowed to transmit a RACH preamble according to a second random access procedure, and a second frequency resource indication identifying at least a second set of frequency resources in which the terminal device is allowed to transmit the RACH preamble.