Device Discovery Signal Resource Allocation for Half-Duplex D2D
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Solution Overview
Problem
In device-to-device communication systems, user equipment (UEs) face challenges in discovering each other due to the half-duplex characteristic, which prevents them from sending and receiving device discovery signals simultaneously, limiting the application of proximity services.
Innovation Solution
A method and apparatus for sending device discovery signals involve acquiring configuration information for discovery resources, determining optimal discovery resource elements through time or frequency division multiplexing, and sending these signals on designated resource elements, establishing a mapping relationship between adjacent resource periods to ensure effective discovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs send device discovery signals simultaneously, then the discovery process is efficient, but the UEs cannot discover each other due to half-duplex limitation
Solution Approach 1:
The patent divides the discovery resource period into multiple discovery resource elements in the time domain, allowing different UEs to transmit discovery signals in different time slots. This segmentation resolves the half-duplex conflict by ensuring that not all UEs transmit simultaneously, enabling both high discovery efficiency and successful mutual discovery.
2Adaptability or versatility
If UEs transmit discovery signals in the same time-frequency resource, then resource utilization is high, but signal collision occurs and discovery fails
Solution Approach 1:
The patent segments discovery resources into multiple time-domain elements within a discovery resource period, distributing UE transmissions across different time slots. This prevents signal collision while maintaining high resource utilization, as resources are fully utilized across the time dimension rather than being concentrated in a single slot.
Solution Approach 2:
The patent implements periodic discovery resource periods with multiple discovery resource elements, creating a structured time schedule for discovery signal transmissions. This periodic structure ensures that UEs can systematically probe for each other while avoiding simultaneous transmissions that would cause collisions.
3Adaptability or versatility
If UEs monitor all discovery resource elements, then discovery coverage is complete, but power consumption increases
Solution Approach 1:
The patent segments the discovery resource period into multiple discovery resource elements, allowing UEs to monitor only specific time slots rather than continuously monitoring all resources. This reduces power consumption while maintaining complete discovery coverage, as UEs can systematically check different time slots at lower power levels.
Data Source
AI summary
The present disclosure discloses a method, apparatus, device and system for sending device discovery signals. The method includes: acquiring configuration information indicating discovery resources for device discovery; determining discovery resource elements for sending the device discovery signals in a discovery resource period indicated by the configuration information, the discovery resource elements being obtained by dividing radio resources in the discovery resource period in a manner of time division multiplexing and/or frequency division multiplexing; and sending the device discovery signals on the determined discovery resource elements.