D2D Resource Hopping for Half-Duplex Discovery
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Solution Overview
Problem
Device-to-device (D2D) communication is limited due to its half-duplex characteristic, which prevents UEs from synchronously sending discovery signals and discovering each other.
Innovation Solution
The method involves determining the position of resources within D2D resource periods using predefined hopping rules, such as inter-group and inter-period hopping rules, to establish mapping relationships between resource positions, allowing D2D signals to be sent on physical resources corresponding to these positions, thereby overcoming the half-duplex limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs send discovery signals simultaneously in D2D communication, then spectrum efficiency is improved, but the half-duplex characteristic prevents mutual discovery
Solution Approach 1:
The discovery signal transmission is segmented into multiple resource pools with different time-frequency positions. UEs are assigned to different resource pools based on their identifiers, allowing simultaneous transmission without collision while maintaining mutual discovery capability through the resource pool structure.
Solution Approach 2:
The resource pool configuration is made dynamic through frequency hopping patterns that change over time. The hopping rules allow UEs to switch between different frequency resources, enabling simultaneous discovery signal transmission while ensuring that UEs can discover each other through the dynamic resource allocation.
2Device complexity
If D2D resources are allocated without hopping rules, then resource allocation simplicity is improved, but resource utilization and interference management deteriorate
Solution Approach 1:
Frequency hopping is implemented as a periodic action with defined hopping patterns and cycles. The resource allocation uses periodic resource pools that repeat at regular intervals, providing structured resource management that improves utilization while maintaining manageable complexity through the periodic structure.
Solution Approach 2:
The hopping rules change parameters such as frequency offset and time shift based on UE identifiers and resource pool configurations. This parameter-based approach allows flexible resource allocation that improves utilization while keeping the allocation mechanism relatively simple through standardized parameter sets.
Data Source
AI summary
A method and device for device-to-device communication and a device for controlling device-to-device communication are provided. The method includes: a position of a first resource included in the Device-to-Device (D2D) resources in a D2D resource period is determined; a position of a second resource is determined according to the position of the first resource and a predefined hopping rule, and a D2D signal is sent on physical resources corresponding to the first resource and the second resource or on a physical resource corresponding to the second resource.