Sidelink Channel Utilization Feedback for Hidden Node Interference

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Solution Overview

Problem

In mobile communication systems, sidelink communication faces interference issues due to the hidden node problem, where user equipment (UEs) within range of each other but out of range of the network cannot successfully receive signals due to shared radio resources, leading to communication failures.

Innovation Solution

The proposed communication control method involves UEs in a PC5-RRC connected state measuring channel utilization and sharing this information to reselect or request new transmission resources, ensuring interference-free communication by using different radio resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If user equipment autonomously selects radio resources for sidelink communication, then communication flexibility and autonomy are improved, but interference from hidden node problems occurs leading to communication failures

Engineering Contradiction:

Improveresource selection autonomyVSAvoidcommunication reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where user equipment measures channel utilization and shares this information with peer UEs through PC5-RRC signaling. This feedback loop enables UEs to make informed resource selection decisions based on actual channel conditions, resolving the hidden node problem while maintaining autonomous resource selection capability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by having user equipment measure and report channel utilization before actual data transmission occurs. This advance information sharing allows peer UEs to select resources that are likely to be free from interference, preventing communication failures before they happen.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If user equipment shares channel utilization information with peer equipment, then resource selection accuracy is improved, but communication overhead increases

Engineering Contradiction:

Improvechannel utilization measurement accuracyVSAvoidcommunication overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies local quality by having each user equipment measure and share channel utilization information specific to its local channel conditions and perspective. Each UE reports measurements relevant to its own transmission and reception experiences, providing localized quality information that helps peer UEs make better resource decisions without requiring global network knowledge.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230262826A1Communication control method

Publication Date: 2023.08.17 KYOCERA CORP

AI summary

An embodiment provides a communication control method in a mobile communication system including a first user equipment and a second user equipment. The first user equipment and the second user equipment communicate wirelessly with each other by sidelink communication. The communication control method includes, by the first user equipment in a PC5-Radio Resource Control (RRC) connected state with the second user equipment, measuring a channel utilization of a radio resource used for the sidelink communication and transmitting the measured channel utilization to the second user equipment. Furthermore, the communication control method includes receiving, by the second user equipment, the channel utilization.