V2V Device Discovery Using Orthogonal Time-Domain Resources
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Solution Overview
Problem
In vehicle-to-vehicle (V2V) communication systems, devices face a significant delay in discovering each other due to the half-duplex mode and random selection of time-frequency resources, leading to conflicts and inefficient signal transmission.
Innovation Solution
A data transmission method where a first device determines two transmission resources according to a preconfigured transmission pattern, using one resource to send status information and another resource on a subsequent occasion, ensuring orthogonal resource occupation in the time domain, thereby reducing delays and conflicts in discovering other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices send discovery signals in multiple consecutive subframes to increase discovery probability, then the discovery reliability is improved, but the time delay increases and productivity deteriorates
Solution Approach 1:
The patent implements periodic discovery signal transmission at predetermined intervals rather than continuous transmission. Devices transmit discovery signals in periodic subframes determined by their device ID, creating a structured periodic action pattern that reduces overall transmission time while maintaining discovery reliability through regular intervals.
Solution Approach 2:
The patent pre-assigns specific subframes for discovery signal transmission based on device IDs before communication begins. This preliminary arrangement of transmission opportunities ensures that devices know in advance when they will transmit and when they can receive, eliminating random access delays and conflict resolution time.
2Adaptability or versatility
If devices randomly select time-frequency resources for discovery signal transmission, then resource allocation flexibility is improved, but resource conflicts increase and reliability deteriorates
Solution Approach 1:
The patent assigns different local transmission characteristics to different devices based on their device IDs. Specifically, each device is assigned particular subframes for transmission based on its ID, creating localized quality differences in the time domain that prevent collisions while maintaining overall system flexibility.
Solution Approach 2:
The patent changes the time-domain parameter (subframe selection) based on device-specific parameters (device IDs). By mapping device IDs to specific transmission subframes, the system transforms random resource selection into a deterministic parameter-based allocation that eliminates conflicts while preserving adaptability.
3Device complexity
If devices operate in half-duplex mode to simplify device complexity, then ease of manufacture is improved, but communication efficiency deteriorates and time loss increases
Solution Approach 1:
The patent segments the communication timeline into dedicated transmission subframes and reception subframes for each device. By dividing time into distinct phases where devices alternate between transmitting and receiving based on their assigned patterns, the system maintains half-duplex simplicity while achieving full-duplex-like discovery efficiency through temporal segmentation.
Data Source
Figure 1-1~1-3
Figure 2
Figure 3-1
AI summary
The present invention provides a data transmission method and a related device, and the method includes: determining, by a first device, a first transmission resource and a second transmission resource according to a transmission pattern, where the first transmission resource and the second transmission resource are corresponding to different locations in the transmission pattern in time domain; and sending, by the first device, status information of the first device to a second device on the first transmission resource, and sending the status information to the second device on the second transmission resource, where the first location and a second location are orthogonal in time domain during one of two consecutive times of sending by the first device, and/or a third location and a fourth location are orthogonal in time domain during the other one of the two consecutive times of sending; and the first transmission resource and the second transmission resource are resources used by the first device during the two consecutive times of sending the status information. In this way, a delay in discovering each other by the first device and the second device is effectively reduced.