Two-Stage Uplink Scheduling Validation for Unlicensed Band Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In LTE networks, especially in unlicensed bands, the existing two-stage uplink scheduling mechanism can lead to multiple unintended uplink transmissions in a multi-UE environment, causing interference and conflicts.

Innovation Solution

A user equipment (UE) is configured to receive first-stage and second-stage uplink resource scheduling messages. The UE determines the validity of the first-stage message based on whether a second-stage message was triggered within a predetermined time period. If valid, the UE performs an uplink transmission only when the first-stage message is determined to be valid.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a two-stage uplink scheduling mechanism is used in unlicensed bands, then uplink resource allocation flexibility is improved, but multiple unintended uplink transmissions occur causing interference and conflicts

Engineering Contradiction:

Improveuplink resource allocation flexibilityVSAvoidinterference and conflicts from multiple transmissions

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by introducing a validation check before executing uplink transmission. The UE validates the first-stage message by checking whether a second-stage message was triggered within a predetermined time period prior to reception. This preliminary validation prevents multiple unintended transmissions by ensuring the scheduling messages are properly coordinated, thus resolving the contradiction between allocation flexibility and transmission conflicts.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If multiple uplink transmissions are allowed in multi-UE environment, then uplink resource utilization is improved, but interference and conflicts increase

Engineering Contradiction:

Improveuplink resource utilizationVSAvoidinterference and conflicts

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements feedback by having the UE check validation information in the first-stage message that indicates whether a second-stage message was triggered. This feedback mechanism allows the UE to determine if it should proceed with transmission, preventing multiple unintended transmissions while maintaining efficient resource utilization. The validation check acts as a feedback loop that coordinates transmissions across multiple UEs, resolving the contradiction between resource utilization and interference.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12279254B2Two-stage trigger procedure

Publication Date: 2025.04.15 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

The invention relates to a user equipment for being scheduled with uplink radio resources. The user equipment receives from a radio base station a first-stage uplink resource scheduling message, indicating uplink radio resources usable by the UE to perform an uplink transmission via an unlicensed cell. The receiver further receives a second-stage uplink resource scheduling message, which is related to the first-stage uplink resource scheduling message. Upon reception of the second-stage uplink resource scheduling message, a processor of the UE determines that an uplink transmission is scheduled in case the first-stage uplink resource scheduling message is valid. The first-stage uplink resource scheduling message is determined valid based on a determination as to whether an uplink transmission has been triggered by another second-stage uplink resource scheduling message within a predetermined time period prior to reception of the second-stage uplink resource scheduling message. The UE then performs an uplink transmission.