Random Access Resource Association in 5G NR

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Solution Overview

Problem

Current random access methods in 5G NR systems face challenges in reducing the number of blind detections and alleviating resource conflicts while maintaining low delay and high reliability, particularly in the RACH process.

Innovation Solution

The method involves acquiring an association between preamble resources and PUSCH resources, allowing terminal devices to determine the appropriate resources for random access, thereby reducing blind detections and conflicts by selecting from multiple associated resources based on user identification or modulation coding schemes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional random access methods are used in 5G NR systems, then the random access process can be completed, but the number of blind detections increases and resource conflicts occur

Engineering Contradiction:

Improverandom access reliabilityVSAvoidnumber of blind detections

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent establishes an association relationship between preamble resources and PUSCH resources in advance through configuration information. This preliminary action allows the terminal to directly determine the PUSCH resource for random access data transmission based on the selected preamble, eliminating the need for blind detection of PUSCH resources and reducing access delay.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If traditional random access methods are used in 5G NR systems, then the random access process can be completed, but resource conflicts occur

Engineering Contradiction:

Improverandom access efficiencyVSAvoidresource conflicts

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the random access resources by establishing one-to-one or many-to-one correspondence between preamble resources and PUSCH resources. This segmentation allows different preambles to be associated with different PUSCH resources, reducing resource conflicts when multiple terminals select the same preamble for random access.

Inventive Principle:

Principle #1Segmentation

3Loss of time

If association between preamble and PUSCH resources is established, then blind detections are reduced, but system complexity increases

Engineering Contradiction:

Improveaccess delayVSAvoidresource association management

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent enables the terminal to autonomously determine the PUSCH resource for random access data transmission by utilizing the pre-established association relationship with the selected preamble. This self-service mechanism eliminates the need for network side allocation and reduces access delay without requiring complex real-time resource management.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS11963226B2Random access method, terminal device, and network device

Publication Date: 2024.04.16 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A method for random access includes that: a terminal device acquires an association between a preamble resource and a physical uplink shared channel (PUSCH) resource; and the terminal device determines, according to the association, a preamble resource and a PUSCH resource used for the terminal device to perform random access. A method for random access includes that: a network device receives a preamble transmitted by a terminal device on a preamble resource, the preamble resource having an association with a physical uplink shared channel (PUSCH) resource; and the network device determines, according to the association between the preamble resource and the PUSCH resource, a PUSCH resource for transmitting a PUSCH by the terminal device. A terminal device and a network device are also provided.