D2D Resource Selection for Simultaneous Signal Transmission
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Solution Overview
Problem
In D2D communication, simultaneous transmission of multiple D2D signals using the same resource pool leads to issues such as increased PAPR, discontinuous resource assignment, and reduced transmission power density, causing SINR deterioration due to power differences and in-band emission.
Innovation Solution
A user apparatus with a resource selection unit that chooses radio resources ensuring multiple D2D signals are not transmitted using the same time resource or discontinuous frequency resources, employing time multiplexing and continuous resource assignment to prevent these issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple D2D signals are transmitted simultaneously using the same resource pool, then resource utilization efficiency is improved, but PAPR increases and transmission power density decreases
Solution Approach 1:
The patent segments the resource pool into different time resources (subframes) and assigns different D2D signals to different time resources. This temporal segmentation allows multiple signals to be transmitted simultaneously in the frequency domain while avoiding power conflicts, thus maintaining transmission power density while improving resource utilization efficiency.
2Productivity
If multiple D2D signals are transmitted simultaneously using the same resource pool, then resource utilization efficiency is improved, but SINR deteriorates due to in-band emission
Solution Approach 1:
The patent segments time resources to assign different D2D signals to different subframes. This prevents signals from overlapping in both time and frequency, eliminating in-band emission interference and maintaining SINR while still allowing efficient resource utilization through multiplexing.
Solution Approach 2:
The patent introduces time as an intermediary dimension for resource separation. By using time multiplexing, the system can transmit multiple D2D signals simultaneously in the frequency domain while preventing interference through temporal separation, thus acting as a mediator between resource utilization efficiency and signal quality.
3Adaptability or versatility
If D2D signals are transmitted using discontinuous frequency resources in the same time resource, then flexibility is improved, but PAPR increases
Solution Approach 1:
The patent segments time resources to separate D2D signal transmissions across different subframes. This allows the system to maintain flexibility in resource assignment while avoiding discontinuous frequency resource allocation within the same time resource, thereby preventing PAPR increase.
Data Source
AI summary
A user apparatus for use in a mobile communication system that supports D2D communication, including: a signal transmission unit configured to transmit a plurality of D2D signals; and a resource selection unit configured to select, from a predetermined resource pool, a radio resource having a time resource and a frequency resource for transmitting the plurality of D2D signals, wherein the resource selection unit is configured to select the radio resource such that the plurality of D2D signals are not transmitted by a same time resource.