D2D Discovery Signal Grouping and Resource Allocation
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Solution Overview
Problem
In wireless communication systems, the existing D2D discovery procedures face inefficiencies due to interference and increased latency, particularly when multiple UEs transmit discovery signals, leading to potential failures in device discovery.
Innovation Solution
The proposed method involves dividing D2D UEs into groups with designated agent UEs for long-range and short-range discovery signals, using distinct transmission powers and resources to minimize interference, and employing a hierarchical structure for efficient signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple UEs transmit discovery signals simultaneously in existing D2D discovery procedures, then device discovery coverage is improved, but interference increases and discovery reliability deteriorates
Solution Approach 1:
The patent segments UEs into different groups (first group and second group) and assigns different discovery signal transmission resources to each group. This segmentation prevents simultaneous transmissions from causing interference while maintaining comprehensive discovery coverage across all UEs.
Solution Approach 2:
The patent introduces a group dimension for resource allocation, where different UE groups use different time-frequency resources for discovery signal transmissions. This additional dimensional separation resolves the interference problem while preserving discovery coverage.
2Speed
If multiple UEs transmit discovery signals simultaneously, then discovery speed is improved, but latency increases due to retransmissions and resource conflicts
Solution Approach 1:
By segmenting UEs into groups with dedicated resources, the patent eliminates retransmissions caused by collisions, thereby reducing discovery latency while maintaining fast discovery speed through parallel group-based operations.
Solution Approach 2:
The patent performs preliminary group assignment and resource allocation before discovery signal transmissions begin. This preliminary organization prevents conflicts and retransmissions, reducing overall discovery latency.
3Device complexity
If uniform resource allocation is used for all UEs, then system complexity is reduced, but interference management capability deteriorates
Solution Approach 1:
The patent segments the UE population into groups and allocates resources accordingly. This segmented approach provides targeted interference management for each group while maintaining manageable system complexity through standardized group-based procedures.
Solution Approach 2:
The patent applies local quality by providing different resource allocation characteristics to different UE groups based on their specific interference environments and discovery requirements, optimizing interference management locally while maintaining overall system efficiency.
Data Source
AI summary
The present invention relates to a wireless communication system. Particularly, the present invention relates to a method and device by which a terminal performs a discovery step for D2D communication in a wireless communication system, the method comprising the steps of: receiving a first discovery signal (DS) including identification information of a target terminal from a member terminal of a first terminal group; checking whether the target terminal belongs to the first terminal group; and transmitting a second DS corresponding to the first DS, wherein if the target terminal belongs to the first terminal group, the second DS is transmitted to member terminals within the first terminal group, and if the target terminal does not belong to the first terminal group, the second DS is transmitted to a specific terminal within a second group different from the first group.