D2D Resource Allocation in Mobile Communication Systems
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Solution Overview
Problem
Current mobile communication systems face challenges in enabling direct Device-to-Device (D2D) proximity services without network intervention, particularly in efficiently managing and allocating time-frequency resources for D2D communication, which can lead to resource collisions and inefficient data transmission.
Innovation Solution
A mobile communication system that allows user terminals to determine and allocate data and control resources from within specified domains within available time-frequency resources, using resource information provided by a base station, and employing scheduling assignments to indicate resource locations, thereby avoiding collisions and optimizing D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If D2D communication is enabled without network intervention, then direct communication between terminals is achieved, but resource collisions occur due to inefficient resource allocation
Solution Approach 1:
The base station acts as an intermediary that provides resource information to user terminals. The base station broadcasts D2D resource information including data radio resources and control radio resources, which terminals use to allocate resources for direct communication without continuous network intervention, thus preventing resource collisions while enabling direct D2D communication
Solution Approach 2:
The base station performs preliminary resource allocation by providing D2D resource information to terminals before direct communication occurs. This preliminary action includes assigning specific data radio resources and control radio resources from the available D2D radio resources, ensuring that terminals have pre-configured resources to avoid collisions during direct communication
2Productivity
If all available time-frequency resources are used for D2D communication, then communication capacity is maximized, but resource collisions increase
Solution Approach 1:
The available D2D radio resources are segmented into different types: data radio resources and control radio resources. The base station provides specific segments (data radio resources and control radio resources) from the total available resources, allowing terminals to use different resource segments for different purposes, thus maximizing capacity while avoiding collisions through structured resource division
Solution Approach 2:
Different local qualities are assigned to different resource segments. Data radio resources are optimized for data transmission while control radio resources are optimized for control information transmission. This local quality differentiation allows efficient use of the entire resource pool while preventing collisions by assigning specific resource characteristics to specific functions
3Loss of energy
If network traffic is reduced through direct D2D communication, then battery consumption decreases, but resource management complexity increases
Solution Approach 1:
User terminals perform self-service in resource selection by autonomously determining data radio resources and control radio resources from the D2D resource information provided by the base station. This self-service approach enables direct D2D communication that reduces network traffic and battery consumption, while the base station's pre-provided resource information keeps resource management complexity manageable
Data Source
AI summary
A first user terminal supporting D2D (Device-to-Device) communication comprises a processor and a memory coupled to the processor. The processor is configured to perform processes of: receiving, D2D resource information from a base station, determining data radio resources and control radio resources on the basis of the D2D resource information, from among D2D radio resources available for the D2D communication, transmitting, D2D communication control information by using the determined control radio resources to a second user terminal, the D2D communication control information indicating locations of the determined data radio resources, and transmitting and retransmitting, D2D communication data by using the determined data radio resources to the second user terminal.