V2V Communication Pilot Resource Allocation for Interference Mitigation
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Solution Overview
Problem
In vehicle-to-vehicle (V2V) communication, the distributed transmission mode of device-to-device (D2D) technology leads to increased interference due to resource reuse, affecting the correct demodulation of data and impairing drivers' ability to perceive traffic conditions beyond their line of sight, potentially leading to dangerous situations.
Innovation Solution
A V2V communication method where terminals receive scheduling assignment messages containing pilot resources and diversity multiplexing modes used by other terminals, allowing them to select alternative resources and modes for data transmission, thereby avoiding interference and improving demodulation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed transmission mode is used for V2V communication, then resource utilization is improved, but interference between terminals increases
Solution Approach 1:
The patent implements a feedback mechanism where terminals report channel state information and interference levels to the base station. The base station uses this feedback to dynamically adjust resource allocation, pilot resource assignment, and power control parameters, resolving the contradiction by adapting resource utilization to actual interference conditions in real-time
Solution Approach 2:
The patent changes key parameters including pilot resource allocation patterns, transmission power levels, and resource block assignments based on channel conditions and interference measurements. By dynamically adjusting these parameters, the system maintains high resource utilization while suppressing interference between terminals
2Productivity
If resource reuse between terminals is increased, then system capacity is improved, but demodulation accuracy deteriorates
Solution Approach 1:
The patent segments the available pilot resources into multiple orthogonal sets and assigns different segments to different terminals or terminal groups. This segmentation allows resource reuse while maintaining orthogonality within each segment, thereby preserving demodulation accuracy even as system capacity increases through broader resource reuse
Solution Approach 2:
The base station acts as an intermediary that coordinates resource allocation between terminals. It manages pilot resource assignment and power control to ensure that resource reuse does not compromise demodulation accuracy, enabling system capacity expansion while maintaining communication reliability
3Productivity
If pilot resources are reused by multiple terminals, then resource efficiency is improved, but interference to data demodulation increases
Solution Approach 1:
The patent applies local quality by assigning different pilot resource characteristics (such as cyclic shifts, frequency offsets, or code sequences) to different terminals even when they share the same time-frequency resources. This local differentiation maintains resource efficiency while minimizing interference to data demodulation through improved channel estimation accuracy
Data Source
AI summary
The present invention relates to a V2V communication method, apparatus, and terminal. The method includes: receiving, by a first terminal, a first scheduling assignment SA message that is sent by a second terminal, where the first SA message includes a first pilot resource and a first diversity multiplexing mode that are used by the second terminal; determining, by the first terminal based on the first pilot resource and the first diversity multiplexing mode, a second pilot resource and a second diversity multiplexing mode that are to be used by the first terminal; and sending, by the first terminal, a data stream to a third terminal based on the second pilot resource and the second diversity multiplexing mode.