D2D Transmission Parameter Control via Reference Signal Feedback

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently managing device-to-device (D2D) communication links, as they often rely on base stations for data transmission, which can lead to suboptimal channel conditions and interference issues when direct D2D links are preferred.

Innovation Solution

A base station determines D2D transmission parameters by instructing one UE device to transmit a reference signal, which is received by another UE device, allowing it to report channel characteristics. Based on this information, the base station adjusts the transmission parameters for optimal D2D communication, while also assessing interference levels to efficiently reuse communication resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If D2D communication is implemented without network assistance, then direct communication between UE devices is enabled, but channel quality and interference management deteriorate

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidchannel quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The base station acts as an intermediary that assists D2D communication by providing reference signals for channel estimation and collecting channel state information from UE devices. This mediator role enables direct D2D communication while maintaining network control over channel quality and interference management.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If base station routes all D2D data transmissions, then channel quality is maintained through network control, but communication efficiency and resource utilization deteriorate

Engineering Contradiction:

Improvechannel qualityVSAvoidcommunication efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The communication function is segmented into control plane (base station for reference signals and channel state collection) and user plane (direct D2D data transmission between UE devices). This segmentation allows channel quality maintenance through network control while enabling efficient direct communication for actual data transfer.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If D2D reference signals are transmitted without network coordination, then device autonomy is improved, but interference levels and resource conflicts increase

Engineering Contradiction:

Improvedevice autonomyVSAvoidinterference levels

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The base station collects channel state information from UE devices that receive reference signals, creating a feedback loop that enables network coordination of D2D reference signal transmissions. This feedback mechanism allows device autonomy in transmission while maintaining network control to manage interference and resource allocation.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11950275B2Apparatus for controlling UE for D2D measurement results

Publication Date: 2024.04.02 KYOCERA CORP

AI summary

A base station (eNB) determines device-to-device (D2D) transmission parameters for signal transmission over a D2D communication link between a first user equipment (UE) device and a second UE device. The eNB instructs the first UE device to transmit a reference signal that is received by the second UE device. The second UE device reports D2D channel characteristic information indicative of the received reference signal. Based on the D2D channel characteristic information, the base station determines the D2D transmission parameters and provides the parameters to the first UE device.