D2D Discovery Signal Transmission Using Buffer-Based Subperiod Sizing
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Solution Overview
Problem
In device-to-device (D2D) communication, existing methods face challenges in efficiently managing the transmission of discovery signals within a discovery period, leading to excessive buffering and resource wastage due to uneven sub-period sizes and lack of effective hopping patterns.
Innovation Solution
A method is introduced where the size of sub-periods is determined based on the buffer size within a discovery period, allowing for repeated transmission of discovery signals using a hopping pattern applied to the discovery period, minimizing unused subframes and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discovery signals are repeatedly transmitted in a discovery period using existing methods, then the discovery signal coverage is improved, but excessive buffering occurs and resources are wasted due to uneven sub-period sizes
Solution Approach 1:
The discovery period is divided into multiple equal-sized sub-periods based on the buffer size of the receiving UE. This segmentation allows the transmitting UE to distribute discovery signal transmissions across multiple sub-periods using hopping patterns, ensuring that signals are received within the buffer constraints while maintaining coverage. The equal sizing of sub-periods prevents resource wastage by optimizing the use of available time resources.
Solution Approach 2:
The patent introduces dynamic hopping patterns that change the time and frequency resources used for discovery signal transmission in each sub-period. This dynamic approach allows the system to adapt to the buffer size constraints while maintaining reliable discovery signal coverage. The hopping pattern ensures that repeated transmissions occur at different resources, improving coverage without causing excessive buffering.
2Device complexity
If discovery signals are transmitted without effective hopping patterns, then the implementation complexity is reduced, but resource allocation efficiency deteriorates due to uneven sub-period sizes
Solution Approach 1:
The patent employs periodic hopping patterns that repeat across discovery periods, providing a structured approach to resource allocation. The hopping pattern is defined by parameters such as frequency shift and subframe shift, which create a predictable periodic structure. This periodic action improves resource allocation efficiency by ensuring systematic coverage while maintaining manageable implementation complexity through standardized pattern generation.
3Adaptability or versatility
If the sub-period size is not optimized based on buffer size, then the system flexibility is maintained, but the number of unused subframes increases leading to resource wastage
Solution Approach 1:
The patent optimizes the sub-period size by changing it based on the buffer size parameter of the receiving UE. The sub-period size is calculated as a function of the buffer size, ensuring that discovery signal transmissions fit within the buffer constraints. This parameter change reduces the number of unused subframes and minimizes resource wastage while maintaining system flexibility through configurable buffer size adaptations.
Data Source
AI summary
One embodiment of the present invention relates to a method whereby a device-to-device (D2D) terminal transmits a discovery signal in a wireless communication system, the discovery signal transmission method comprising the steps of: determining the size of a subperiod in a discovery period on the basis of a buffer size; and repeatedly transmitting the discovery signal in the subperiod corresponding to the determined size by using a hopping pattern applicable to the discovery period.