Signal Transmission Control for D2D In-Band Interference
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Solution Overview
Problem
In device-to-device (D2D) communications, terminals with different types transmit signals using the same resource pool, leading to significant power differences, causing in-band emission interference and signal loss in the receive-end device due to the high power signals overpowering the low power signals in the same frequency domain.
Innovation Solution
The method involves adjusting the transmit power of terminals to minimize power differences by either increasing the power of high-power terminals or decreasing the power of low-power terminals, or by using guard bands to separate resource locations, ensuring that signals are not transmitted in the same time interval and frequency domain, thereby reducing in-band emission interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different types of terminals transmit signals using the same resource pool in the same time interval and frequency domain, then resource utilization efficiency is improved, but in-band emission interference occurs and signal loss happens due to large power differences
Solution Approach 1:
The patent segments the shared resource pool into type-specific resource pools based on terminal types. Terminals of different types (e.g., vehicle-mounted, pedestrian, stationary) are assigned to different resource pools, preventing simultaneous transmissions in the same time-frequency resources. This segmentation eliminates in-band emission interference while maintaining high resource utilization within each segmented pool.
Solution Approach 2:
The patent introduces a new dimension for resource allocation by classifying terminals into different types and assigning them to different resource pools. This dimensional separation (terminal type-based classification) allows the system to resolve the interference problem caused by power differences without sacrificing overall resource utilization efficiency.
2Speed
If high power terminals transmit signals in the same frequency domain as low power terminals, then transmission distance and coverage are improved, but the high power signals cause severe interference to low power signals
Solution Approach 1:
The patent segments resources by terminal type, ensuring that high power terminals (e.g., vehicle-mounted) and low power terminals (e.g., pedestrian) operate in separate resource pools. This prevents high power signals from interfering with low power signals while allowing each terminal type to transmit at its required power level for adequate coverage.
Solution Approach 2:
The patent applies local quality by assigning different resource allocations and power levels specific to each terminal type. Each terminal type receives optimized resource allocation suited to its transmission characteristics, allowing high power terminals to achieve long distance while low power terminals maintain reliable short-range communication without mutual interference.
Data Source
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AI summary
Embodiments of the present invention provide a signal transmission control method and apparatus. In the embodiments of the present invention, a first-type terminal increases signal transmit power and/or a second-type terminal decreases signal transmit power, or when selecting a resource location for signal transmission, a terminal may exclude a resource location that is close in frequency domain to and located in a same time interval as a resource location reserved by another terminal of a different type, or resource locations used by different types of terminals to transmit signals are separated by a resource location occupied by a guard band, to reduce in-band emission interference.