D2D Communication SCI Format Detection for Interference Reduction
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Solution Overview
Problem
In the Internet of Vehicles system, terminal devices operating under different 3GPP protocol versions, such as Release-14 and Release-15, experience mutual interference when sharing a common resource pool, particularly between devices in transmission mode 3 and mode 4, affecting transmission reliability.
Innovation Solution
A method for D2D communication where a terminal device receives sidelink control information to determine the format of resource reservation bits, allowing it to avoid using conflicting time-frequency resources, thereby reducing interference by prohibiting data transmission on specific resources indicated by the control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminal devices of different 3GPP protocol versions share a common resource pool, then resource utilization efficiency is improved, but mutual interference increases and transmission reliability deteriorates
Solution Approach 1:
The patent segments the resource pool by protocol version, creating separate resource pools for Release-14 devices and Release-15 devices. This segmentation prevents mutual interference between different protocol versions while maintaining high resource utilization within each version-specific pool.
Solution Approach 2:
The patent applies local quality by configuring different resource pool parameters (such as subcarrier spacing, cyclic prefix length, and resource allocation patterns) specifically tailored to each 3GPP protocol version's requirements. Release-14 devices receive resources optimized for their protocol characteristics, while Release-15 devices receive resources optimized for their enhanced features, thereby eliminating interference while maximizing overall system productivity.
2Use of energy by moving object
If terminal devices of different protocol versions use the same resource pool, then spectrum efficiency is improved, but interference between devices increases
Solution Approach 1:
The patent divides the spectrum into separate resource pools based on protocol version, ensuring that Release-14 and Release-15 devices operate on different frequency-time resources. This segmentation eliminates inter-version interference while maintaining high spectrum efficiency by fully utilizing each version-specific resource pool.
Solution Approach 2:
The patent configures local resource pool characteristics (subcarrier spacing, resource block allocation, reference signal patterns) that are optimized for each protocol version's specific requirements. This ensures that each version operates with optimal spectrum efficiency on its dedicated resources without causing or suffering from interference from other versions.
3Device complexity
If resource reservation bit format is not differentiated, then device complexity is reduced, but resource conflict detection capability deteriorates
Solution Approach 1:
The patent creates a universal SCI format structure that can accommodate both Release-14 and Release-15 devices, with the resource reservation bit field serving multiple functions: indicating resource reservation status for Release-14 devices and indicating both reservation status and format type for Release-15 devices. This multi-functionality reduces the need for completely separate control formats while maintaining precise resource conflict detection.
Solution Approach 2:
The patent changes the interpretation parameters of the resource reservation bit based on the detected SCI format type. When the format type indicates Release-14, the resource reservation bit is interpreted in the traditional manner; when the format type indicates Release-15, the same bit is interpreted with enhanced meaning including format identification. This parameter change approach enables precise resource conflict detection without increasing structural complexity.
Data Source
AI summary
The present application discloses a method for D2D communication and a terminal device, the method including: receiving, sidelink control information (SCI) transmitted by a second terminal device; determining, by the first terminal device, that the SCI is in a first format or in a second format, where the SCI includes a resource reservation bit, and the resource reservation bit in the SCI of the first format is not used to indicate whether the second terminal device reserves a time-frequency resource for next data transmission, and the resource reservation bit in the SCI of the second format is used to indicate whether the second terminal device reserves the time-frequency resource for the next data transmission; and prohibiting data transmission on a plurality of the time-frequency resources distributed in accordance with a first time period if the first terminal device determines that the SCI is in the first format.