D2D Resource Allocation via UE Interest Indication
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Solution Overview
Problem
In wireless communication systems, especially for public safety networks, Device-to-Device (D2D) operations face inefficiencies due to the need for UEs to monitor D2D discovery signals across the entire resource pool, which can lead to missed cellular downlink signals, particularly for UEs with limited resources and single receiving units.
Innovation Solution
The method involves UEs informing the network of specific resources they are interested in for D2D operations, allowing the network to allocate and configure resources efficiently, ensuring reliable D2D communication while minimizing interference with cellular communication by restricting downlink signal monitoring to only necessary resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors the entire resource pool for D2D discovery signals, then the D2D discovery reliability is improved, but the UE may miss cellular downlink signals and resource utilization efficiency deteriorates
Solution Approach 1:
The resource pool is segmented into multiple parts based on UE interest. The UE indicates its interested resources to the network, which then allocates D2D discovery resources only in those specific segments rather than requiring monitoring of the entire resource pool. This segmentation allows the UE to focus monitoring efforts on relevant portions, maintaining D2D discovery reliability while improving resource utilization efficiency.
2Device complexity
If the UE has only one receiving unit, then device complexity is reduced, but the ability to simultaneously receive cellular and D2D signals deteriorates
Solution Approach 1:
The system dynamically adapts resource allocation based on UE capability. When the UE has only one receiving unit, the network dynamically adjusts by allocating D2D resources in time-frequency slots that do not conflict with cellular downlink receptions. The UE dynamically indicates its interested resources, and the network responds by configuring appropriate resource allocations, enabling single-receiving-unit UEs to function effectively without missing critical signals.
3Area of stationary object
If the network allocates D2D resources in the entire resource pool, then D2D operation coverage is improved, but interference with cellular communication increases
Solution Approach 1:
The network applies local quality by allocating D2D resources specifically in the portions of the resource pool where UEs have indicated interest, rather than uniformly across the entire pool. This localized resource allocation ensures that D2D operations have adequate coverage in needed areas while minimizing resource consumption and interference in areas where D2D is not required, thereby reducing harmful effects on cellular communication.
Data Source
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AI summary
Provided are a device-to-device (D2D) operation method of a user equipment (UE) in a wireless communication system and a UE using the method. The method comprises the steps of: transmitting sidelink UE information to a network; and receiving a D2D resource configuration determined on the basis of the sidelink UE information, wherein the sidelink UE information comprises at least one of information indicating whether the UE is interested in receiving a D2D signal, and a resource allocation request for transmitting the D2D signal.