Random Access Resource Selection in SBFD Uplink Subbands

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Solution Overview

Problem

In networks with SubBand Full Duplex (SBFD) features, there is a lack of a solution for determining uplink resources during the random access procedure.

Innovation Solution

A random access method and apparatus that allows terminals to determine resources used in target transmissions, including PRACH and uplink transmissions, through a random access mode, enhancing flexibility and effectiveness in resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If random access uses uplink resources in uplink subband configured in semi-static downlink symbols or semi-static flexible symbols, then resource utilization flexibility is improved, but the ability to determine specific uplink resources is worsened

Engineering Contradiction:

Improveresource utilization flexibilityVSAvoidability to determine specific uplink resources

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent segments the uplink resources into specific designated resources within the uplink subband, separating them from general downlink resources. This allows the system to maintain flexibility in using semi-static downlink/flexible symbols while being able to precisely identify and allocate specific time-frequency resources for random access procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism (random access mode configuration) that mediates between the flexible resource usage requirement and the need for precise resource determination. This intermediary layer enables the terminal to identify specific uplink resources through configured parameters while still utilizing the flexible uplink subband resources.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If random access procedure is implemented in SBFD network, then network capacity is improved, but time delay increases due to lack of clear resource determination

Engineering Contradiction:

Improvenetwork capacityVSAvoidtime delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring the random access mode parameters and uplink resource specifications before the random access procedure begins. The terminal receives configuration information in advance that clearly defines which uplink resources will be used, eliminating uncertainty and reducing processing time during the actual random access execution.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes parameter changes by dynamically adjusting the resource configuration parameters based on the specific SBFD network conditions. The random access mode parameters are modified to reflect the actual uplink resource availability in semi-static downlink/flexible symbols, optimizing both capacity and reducing time delay through adaptive parameter selection.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260040368A1Random access method and apparatus, terminal, network device, and medium

Publication Date: 2026.02.05 VIVO MOBILE COMM CO LTD

AI summary

A random access method and apparatus, a terminal, a network device, and a medium, are provided. The random access method includes: executing, by a terminal, random access in a random access mode, where the random access mode is used for determining resources used by a target transmission, and the target transmission includes at least one of the following: a Physical Random Access CHannel (PRACH) transmission corresponding to the random access or a target uplink transmission during a process of the random access.