Wireless Communication Device Frame Collision Detection
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Solution Overview
Problem
The existing wireless LAN communication systems, particularly those using the CSMA/CA access control method, fail to effectively detect frame collisions after the start of transmission due to complex processing requirements and inability to check neighboring devices' transmission status in real-time, leading to interference issues when communication devices move within the coverage area.
Innovation Solution
A communication device equipped with an in-transmission information generating unit, a neighboring signal presence information generating unit, and a collision detection unit that determines the transmission end point of a wireless frame and checks for signals of a predetermined level on the wireless channel post-transmission to detect potential frame collisions, simplifying the collision detection process by avoiding the need for complex signal sensing and time-series data conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex signal sensing and time-series data conversion processing is performed to detect frame collisions, then collision detection capability is improved, but device complexity and processing overhead increase significantly
Solution Approach 1:
The patent extracts only the essential collision detection function from complex signal processing. Instead of performing full time-series conversion and analysis, the system selectively monitors only the post-transmission time period for signal presence, extracting the minimal necessary information for collision detection while discarding unnecessary processing steps
Solution Approach 2:
The system determines the transmission end point in advance based on frame length and transmission rate before actual transmission completes. This preliminary determination allows the system to start monitoring at the precise moment when collision could occur, eliminating the need for continuous complex processing throughout the entire transmission period
2Measurement precision
If real-time monitoring of neighboring devices is performed after transmission starts, then collision detection accuracy is improved, but use of energy and processing resources increases
Solution Approach 1:
The system performs monitoring in a periodic manner rather than continuously. It activates signal presence monitoring only during the specific time period after transmission end point, then stops monitoring. This periodic action provides sufficient collision detection accuracy while dramatically reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The system applies partial monitoring by focusing only on the critical post-transmission period when collisions are most likely to occur. Instead of monitoring the entire transmission duration or using full-spectrum signal analysis, it performs partial monitoring of signal presence in the specific time window where collision detection is most valuable
3Reliability
If the communication device checks for signals throughout the entire transmission period, then collision detection coverage is improved, but loss of time and transmission efficiency worsen
Solution Approach 1:
The transmission end point is calculated in advance based on the frame length and transmission rate before the actual transmission completes. This preliminary action allows the system to know exactly when to start monitoring for collisions, eliminating unnecessary monitoring during the transmission period and avoiding any loss of transmission time
Solution Approach 2:
The system skips the monitoring phase during the actual transmission period and rushes directly to monitoring only after transmission completes. By skipping unnecessary monitoring during transmission and focusing only on the critical post-transmission period, the system maintains full collision detection coverage while minimizing time loss
Data Source
AI summary
A communication device includes a wireless communication unit, an in-transmission information generating unit, and a neighboring signal presence information generating unit. The wireless communication unit transmits and receives wireless frames via an antenna. The in-transmission information generating unit generates in-transmission information representing whether or not a wireless frame is being transmitted from the antenna. The neighboring signal presence information generating unit generates neighboring signal presence information representing whether or not a signal of a predetermined level or higher is present on a wireless channel that is the same as a wireless channel of the wireless frame. The collision detection unit determines a transmission end point of the wireless frame transmitted from the wireless communication unit based on the in-transmission information, determines whether or not there is a signal of the predetermined level or higher on the wireless channel through which the wireless frame is transmitted within a period from the determined transmission end point until a first time elapses, based on the neighboring signal presence information, and determines whether or not the transmitted wireless frame collided with another wireless frame, based on the determination made based on the neighboring signal presence information.