D2D Discovery Resource Allocation in Multi-Macro Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in performing device-to-device (D2D) discovery procedures efficiently in a multiple macro environment, particularly in managing resource allocation and balancing resource usage among macros, which leads to resource imbalances.
Innovation Solution
A method for transmitting a discovery message in a wireless communication system that involves discovering D2D synchronization signals, classifying macros based on signal strength, receiving macro resource allocation information, sensing macro resources, determining a discovery resource, and transmitting the discovery message through the determined resource, allowing for efficient use of macro resources not associated with terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D discovery procedure is performed in multiple macro environment using conventional methods, then device-to-device communication can be established, but resource imbalance occurs between macros leading to inefficient resource utilization
Solution Approach 1:
The patent applies local quality by allowing different macros to use different discovery resources based on their local conditions. Specifically, macros are classified into first macros and second macros, where first macros use first discovery resources and second macros use second discovery resources. This localized resource allocation adapts to the specific characteristics of each macro, preventing resource imbalance and improving overall D2D discovery efficiency in multiple macro environments.
2Quantity of substance
If macro resources are shared among multiple terminals, then resource utilization increases, but resource imbalance and interference between terminals occur
Solution Approach 1:
The patent applies segmentation by dividing discovery resources into distinct types (first discovery resources and second discovery resources) that are separately allocated to different macros. This segmentation prevents terminals from interfering with each other's resource usage while maintaining high overall resource utilization. Each macro can independently use its assigned resources without conflict, ensuring both efficient utilization and fair allocation.
3Device complexity
If discovery resources are allocated without considering macro classification, then allocation process is simple, but resource imbalance and poor communication efficiency occur
Solution Approach 1:
The patent applies preliminary action by classifying macros into first macros and second macros before allocating discovery resources. This preliminary classification enables the system to assign appropriate resources (first discovery resources to first macros, second discovery resources to second macros) in advance, preventing resource imbalance and improving communication efficiency. The classification step, while adding some complexity, ensures optimal resource utilization and should be performed once during system initialization or configuration.
Data Source
AI summary
A method for transmitting a discovery message in a wireless communication system supporting device-to-device (D2D) direct communication, the method performed by the device, includes: discovering a D2D synchronization signal; classifying one or more macros by using the strength of the discovered D2D synchronization signal; receiving macro resource allocation information from a base station of the classified macro; sensing a macro resource of the classified macro based on the received macro resource allocation information; determining a macro resource for selecting a discovery resource through the sensing result; determining a discovery resource for transmitting a discovery message in the determined macro resource; and transmitting the discovery message through the determined discovery resource.