D2D Communication Resource Allocation via Two-Subslot Scheduling
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Solution Overview
Problem
In D2D communication, when minimal or no help is provided by a base station, it is challenging to achieve contention-free resource allocation and prevent interference from unwanted signals, especially in unlicensed bands, leading to unstable resource reservation and potential collisions.
Innovation Solution
A D2D communication method that involves generating scheduling request and response signals through specific subslots within resource blocks, using SINR-based selection for resource blocks with low interference, and transmitting data indication signals to ensure contention-free data transmission, thereby stabilizing resource allocation and preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contention-free resource allocation is implemented in unlicensed bands, then resource reservation stability is improved, but interference from unwanted signals increases
Solution Approach 1:
The patent applies preliminary action by implementing a two-subslot structure where the first subslot transmits scheduling request indication signals and resource block selection information before the second subslot transmits the actual scheduling request signals. This advance notification mechanism allows receiving terminals to prepare for potential interference and select resource blocks that minimize collision risks, thereby resolving the contradiction between maintaining reliable resource reservation and avoiding unwanted signal interference in contention-free unlicensed band operations.
2Adaptability or versatility
If base station provides minimal or no help to terminals, then device autonomy is improved, but resource allocation reliability deteriorates
Solution Approach 1:
The patent implements self-service by enabling terminals to autonomously perform resource block selection, scheduling request transmission, and data transmission without base station assistance. The terminal independently selects resource blocks based on interference conditions, transmits scheduling requests in a structured two-subslot format, and executes data transmission using the reserved resources. This self-service mechanism maintains device autonomy while ensuring reliable resource allocation through standardized procedures, resolving the contradiction between autonomy and reliability in unlicensed band D2D communication.
3Productivity
If centralized resource scheduling is implemented, then throughput is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the resource allocation process into distinct functional segments: resource block selection in the first subslot, scheduling request transmission in the second subslot, and data transmission in subsequently reserved resources. This segmentation allows terminals to autonomously manage different aspects of resource allocation independently, achieving efficient throughput without requiring complex centralized scheduling infrastructure. The segmented approach reduces system complexity while maintaining high productivity through standardized, modular procedures.
Data Source
AI summary
A first terminal generates a first scheduling request signal including information about first data resources for data transmission when the first terminal tries to reserve the first data resources. The first terminal generates a first scheduling request indication signal providing notification that the first scheduling request signal is to be transmitted. The first terminal transmits the first scheduling request indication signal through a first request subslot included in a first scheduling request resource before transmitting the first scheduling request signal. The first terminal transmits the first scheduling request signal through a second request subslot included in the first scheduling request resource.