V2V Slot Selection Reducing Packet Collisions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In vehicle-to-vehicle communication systems, the increased number of terminal apparatuses at intersections leads to a higher probability of packet signal collisions, which can result in failed data transmission and hinder the objective of preventing collision accidents.
Innovation Solution
A communication system that includes an access control apparatus generating frames with reserved control slots, allowing terminal apparatuses to perform carrier sensing and select empty slots for data transmission, thereby reducing collision probability through synchronized slot usage and OFDM signal modulation with identification carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of terminal apparatuses is increased to handle high communication volume, then the communication capacity is improved, but the collision probability of packet signals increases
Solution Approach 1:
The communication channel is segmented into multiple time slots within each frame structure. Terminal apparatuses are assigned specific time slots for transmission, which divides the shared medium into discrete segments. This segmentation allows multiple devices to communicate simultaneously without collision, resolving the contradiction between handling high communication volume and maintaining low collision probability.
Solution Approach 2:
The system implements periodic frame structures with repeating time slot patterns. Each frame contains a fixed sequence of time slots that repeat at regular intervals, creating a periodic communication rhythm. This periodic action allows terminal apparatuses to predict transmission opportunities and coordinate their communications systematically, reducing collisions while maintaining high throughput.
2Productivity
If broadcast transmission is used to reach multiple terminal apparatuses simultaneously, then the communication efficiency is improved, but the collision probability increases due to lack of carrier sense
Solution Approach 1:
The system performs preliminary actions by establishing a frame structure with pre-defined time slots before actual data transmission begins. Terminal apparatuses use this predetermined slot allocation to coordinate their broadcast transmissions, ensuring that multiple devices can transmit simultaneously in different slots without collision. This preliminary structuring enables efficient broadcast communication while maintaining reliability.
3Reliability
If time slots are allocated for data transmission, then the collision probability is reduced through synchronized usage, but the frame structure complexity increases
Solution Approach 1:
The system uses homogeneous time slot structures where each slot has the same format and characteristics. This uniformity simplifies the frame structure by repeating the same pattern throughout, making it easier for terminal apparatuses to process and synchronize. The homogeneous design reduces complexity while maintaining the collision-reducing benefits of time slot allocation.
Data Source
AI summary
A control information extraction unit receives information on a frame that contains at least a plurality slots from an access control apparatus for controlling communications between radio apparatuses. The control information extraction unit generates a frame that contains at least a plurality of slots in such a manner as to synchronize with the frame corresponding to the received information. An estimation unit estimates empty slots in the plurality of slots generated. A selection unit selects, at random, at least one of the estimated. A modem unit and the like broadcast data using the selected slot.