D2D Discovery Resource Allocation via eNodeB State Segmentation
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Solution Overview
Problem
Traditional D2D discovery methods in cellular networks suffer from low signal resource utilization and conflicts due to uniform allocation of discovery signal resources without considering user equipment states, locations, or application types, leading to inefficiencies and reliability issues.
Innovation Solution
A D2D discovery method where an eNodeB allocates discovery signal resources based on user equipment states, locations, and application types, allowing for flexible resource management and conflict reduction by using GROUP A and GROUP B resources dynamically, and adjusting resource pools to optimize signal usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If discovery signal resources are uniformly allocated to all user equipments, then resource allocation is simple and fast, but signal resource utilization is low and conflicts occur frequently
Solution Approach 1:
The patent applies local quality by allocating different discovery signal resources based on user equipment states (idle/connected), locations (cell center/cell edge), and application types. This differentiated allocation strategy ensures that each UE receives resources appropriate to its specific context, reducing conflicts while improving overall resource utilization efficiency.
Solution Approach 2:
The patent implements dynamic resource allocation where the eNodeB adjusts discovery signal resources based on real-time UE states, locations, and application requirements. The system can dynamically switch between GROUP A resources (for connected state UEs) and GROUP B resources (for idle state UEs), and adjust resource pool configurations to adapt to changing network conditions, thereby reducing resource conflicts while maintaining high allocation efficiency.
2Device complexity
If discovery signal resources are allocated without considering user equipment states and locations, then allocation process is simple, but resource utilization rate decreases and conflicts increase
Solution Approach 1:
The patent segments discovery signal resources into different groups (GROUP A for connected state UEs, GROUP B for idle state UEs) and further divides them by location (cell center vs. cell edge). This segmentation allows the system to manage complexity through structured organization while improving resource utilization by assigning appropriate resources to each segment, thereby reducing conflicts without overwhelming the allocation process.
Solution Approach 2:
The patent changes key parameters including UE state (idle/connected), location (cell center/cell edge), and application type to determine resource allocation. By systematically varying these parameters and using them as decision criteria, the system improves resource utilization and reduces conflicts while maintaining manageable complexity through rule-based allocation logic.
3Ease of manufacture
If traditional uniform resource allocation is used, then implementation is straightforward, but D2D discovery reliability is poor due to conflicts and low utilization
Solution Approach 1:
The eNodeB acts as an intermediary that manages and coordinates discovery signal resource allocation. It receives information about UE states, locations, and application types, then makes intelligent allocation decisions using the differentiated resource pools (GROUP A and GROUP B). This intermediary approach improves D2D discovery reliability by preventing conflicts while keeping the implementation manageable through centralized control rather than complex distributed algorithms.
Data Source
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AI summary
A device-to-device (D2D) discovery method, an eNodeB and a user equipment are disclosed. The method includes: a user equipment acquiring discovery signal resources allocated by an eNodeB (eNB) to the user equipment, wherein the discovery signal resources include time-frequency domain resources used for sending or monitoring a discovery signal; and when the user equipment performs a D2D discovery operation, sending or monitoring the discovery signal according to acquired discovery signal resources to perform D2D discovery.