Wireless LAN Terminal Collision Control via State Notification
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Solution Overview
Problem
As the number of communication terminals connected to a wireless LAN increases, the probability and count of data collisions rise, leading to degraded throughput in wireless LAN communication, making it difficult to manage effectively.
Innovation Solution
A communication terminal system that includes data-storing-terminal counting, communication terminal count estimation, adjustment reference value calculation, and data transmission determination mechanisms to manage and limit data transmission based on estimated terminal counts, ensuring only a preset number of terminals transmit data simultaneously, thereby reducing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of communication terminals in wireless LAN increases, then network coverage and connectivity improve, but data collision probability and collision count increase
Solution Approach 1:
The system performs preliminary actions by having communication terminals periodically transmit state notification signals indicating their data holding status before actual data transmission occurs. This allows other terminals to acquire information about data holding status in advance, enabling them to make informed transmission decisions and avoid collisions by selecting appropriate time slots based on acquired information.
Solution Approach 2:
The system implements feedback mechanisms where communication terminals transmit state notification signals containing information about held data to other terminals. Receiving terminals use this feedback information to determine transmission timing, adjusting their transmission behavior based on the current state of the network and the data holding status of other terminals, thereby reducing collision probability.
2Productivity
If communication terminals transmit data simultaneously without coordination, then data transmission speed increases, but collision count increases and throughput degrades
Solution Approach 1:
The system segments the data transmission process by dividing it into distinct time slots and phases. Communication terminals transmit state notification signals in certain time slots to indicate data holding status, while other time slots are designated for actual data transmission. This segmentation allows the system to maintain high transmission speeds while coordinating access to prevent collisions and ensure reliable throughput.
3Reliability
If communication terminals use random backoff timing to avoid collision, then collision avoidance is achieved, but transmission efficiency decreases due to unnecessary waiting
Solution Approach 1:
The system performs preliminary actions by having terminals exchange state notification signals indicating data holding status before the actual data transmission phase. This preliminary information exchange allows terminals to make informed decisions about transmission timing, reducing the need for random backoff waiting and improving transmission efficiency while maintaining collision avoidance through coordinated time slot selection based on acquired information.
Data Source
AI summary
A data-storing-terminal counting unit counts the number of communication terminals in which each of a number of data are stored. Based on the results of the counts, a communication terminal count estimation unit estimates the number of communication terminals that will transmit data with the same timing. An adjustment reference value calculation unit computes an adjustment reference value for constraining the number of communication terminals estimated by the communication terminal count estimation unit to be less than or equal to a preset allowable number. On the basis of the adjustment reference value computed by the adjustment reference value calculation unit, a determination unit determines whether or not to permit transmission of data stored by a storing means. If the determination unit permits the transmission of said data, a data transmission unit transmits the data to a communication terminal in which said data is not stored.