D2D Frame Structure with Contention Period for Collision-Free Scheduling

Solution Overview

Problem

Current device-to-device (D2D) communication technologies face challenges in efficiently allocating scheduling information on time/frequency resources, leading to potential collisions and inefficient data transmission, especially as mobile traffic continues to increase.

Innovation Solution

A method and apparatus for allocating scheduling information in a D2D communication system, utilizing a D2D frame structure with a contention period for control information and a data period for data transmission, including contention-based SA periods, DM-RS periods, and SA guard periods, to prevent collisions and optimize resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple transmission terminals transmit scheduling information simultaneously on the same time/frequency resource, then the resource utilization is high, but collisions occur and transmission reliability deteriorates

Engineering Contradiction:

Improveresource utilizationVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The resource pool is segmented into multiple contention-based SA periods, and each transmission terminal is assigned to a specific period through contention resolution. This segmentation allows multiple terminals to transmit scheduling information simultaneously without collisions, maintaining high resource utilization while ensuring transmission reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A contention resolution mechanism is implemented before actual data transmission to allocate time/frequency resources to multiple transmission terminals. This preliminary action prevents collisions by ensuring that each terminal has a dedicated resource assignment before transmitting scheduling information, thus maintaining both high resource utilization and transmission reliability.

Inventive Principle:

Principle #10Preliminary action

2Speed

If scheduling information is transmitted without collision prevention mechanisms, then the transmission speed is fast, but collisions occur and resource allocation efficiency deteriorates

Engineering Contradiction:

Improvetransmission speedVSAvoidresource allocation efficiency

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

A contention resolution mechanism is implemented before actual data transmission to allocate time/frequency resources to multiple transmission terminals. This preliminary action prevents collisions by ensuring that each terminal has a dedicated resource assignment before transmitting scheduling information, thus maintaining both high resource utilization and transmission reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A base station acts as an intermediary to manage resource allocation among multiple transmission terminals. The base station coordinates the contention-based SA periods and assigns resources to terminals, enabling fast transmission while preventing collisions and maintaining high resource allocation efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If traditional D2D communication technologies are used, then the device complexity is low, but they cannot support long-distance communication and traffic distribution effectively

Engineering Contradiction:

Improvedevice complexityVSAvoidcommunication distance and traffic distribution capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

A base station acts as an intermediary to manage resource allocation among multiple transmission terminals. The base station coordinates the contention-based SA periods and assigns resources to terminals, enabling fast transmission while preventing collisions and maintaining high resource allocation efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10187902B2Method and apparatus for performing device-to-device direct communication between devices in wireless communication system

Publication Date: 2019.01.22 LG ELECTRONICS INC

AI summary

The present invention relates to a method and apparatus for performing a D2D communication between device-to-device (D2D) devices in a wireless communication system in which a D2D direct communication is supported performed by a D2D transmission user equipment (UE), and the method includes transmitting control information related to a scheduling assignment through a D2D frame defined for the D2D communication to a D2D reception UE, and transmitting D2D data to the D2D reception UE through the D2D frame, wherein the D2D frame includes a contention period in which the control information is transmitted and a D2D data period in which the D2D data is transmitted, and wherein the contention period is located in front of the D2D data period.