Access Control Apparatus for V2V Slot Collision Management
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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
An access control apparatus that detects empty and collision slots within a frame structure, broadcasts control information to guide terminal apparatuses in selecting available slots for data transmission, and adjusts the frame structure based on the number of terminal apparatuses to minimize collisions, using OFDM signals with identification carriers to ensure control information detection even in collision scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of terminal apparatuses increases to handle more communication at intersections, then the communication coverage is improved, but the collision probability of packet signals increases
Solution Approach 1:
The communication frame is divided into multiple slots, and the system identifies and designates specific empty slots for terminal apparatuses to use. This segmentation of time resources reduces the probability of packet signal collisions while maintaining the ability to serve multiple terminals at intersections.
2Productivity
If broadcast communication is used to transmit information to multiple terminal apparatuses, then the communication efficiency is improved, but the collision probability of packet signals increases
Solution Approach 1:
The access control apparatus periodically identifies empty slots within frame structures and designates them for use by terminal apparatuses. This periodic slot designation system enables efficient broadcast communication while reducing collisions through structured time division.
3Adaptability or versatility
If CSMA/CA access control is used in wireless LANs, then the wireless channel sharing is improved, but the carrier sense function fails due to distance and obstacles
Solution Approach 1:
The access control apparatus acts as an intermediary that identifies empty slots and designates them to terminal apparatuses. This intermediary system replaces the unreliable carrier sense mechanism with a centralized slot management approach that works reliably despite distance and obstacles.
Data Source
AI summary
It is specified in a manner such that a frame containing a first period formed by a plurality of slots and a second period having a predetermined length is repeated. A detecting unit detects a slot, which is usable for the communications between a plurality of other terminal apparatuses, from among a plurality of slots in the first period of a frame containing the first period and the second period. A modem unit and an RF unit broadcast information on the detected slot.