PLCA Emergency Transmission Preemption Mechanism
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Solution Overview
Problem
In physical layer collision avoidance (PLCA) networks, devices entering emergency transmission mode often face long waiting times due to the need to wait for other nodes to complete their transmission opportunities, even if those nodes have lower priority.
Innovation Solution
A method for emergency transmission in PLCA networks, where a device entering emergency mode can suspend the packet transmissions of other devices with lower transmission priorities by sending interference packets, thereby shortening its own waiting time and allowing earlier access to its transmission opportunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PLCA nodes share bandwidth evenly and wait for their transmission opportunity, then transmission order is maintained and network stability is preserved, but transmission delay increases significantly for emergency packets
Solution Approach 1:
The system dynamically adjusts transmission priorities based on packet type. Normal packets follow the standard PLCA transmission opportunity sequence, while emergency packets trigger a priority preemption mechanism that allows high-priority nodes to interrupt or skip lower-priority transmissions, reducing delay while maintaining network stability through controlled dynamic behavior
Solution Approach 2:
The invention changes the transmission parameter (priority level) based on packet type. By identifying emergency packets and assigning them a higher priority parameter, the system allows these packets to bypass the normal transmission queue, effectively reducing transmission delay without compromising the overall network stability through parameter-based differentiation
2Stability of the object's composition
If nodes with higher priority wait for their transmission opportunity, then transmission order is maintained, but emergency packet transmission is delayed until other nodes complete
Solution Approach 1:
The system performs preliminary identification of emergency packets at the source node before transmission. By detecting the emergency nature of a packet in advance, the node can prepare for priority transmission and trigger preemption mechanisms before entering the normal transmission queue, ensuring faster emergency packet delivery while maintaining overall transmission order
Solution Approach 2:
The invention introduces a priority preemption mechanism as an intermediary between the standard PLCA protocol and emergency packet transmission. This intermediary layer detects emergency packets and facilitates their priority transmission by interrupting or skipping lower-priority nodes, thereby improving emergency transmission speed without completely disrupting the established transmission order
Data Source
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AI summary
Embodiments of the disclosure provide a physical layer collision avoidance (PLCA) device (10 to 1N) and a method for performing emergency transmission thereof. The method includes: in response to determining that the PLCA device (10 to 1N) enters an emergency transmission mode, finding a first PLCA device that is performing a corresponding first packet transmission; in response to determining that a first transmission priority of the first PLCA device is lower than a transmission priority of the PLCA device (10 to 1N), suspending the first packet transmission of the first PLCA device; and in response to determining that it is the PLCA device's (10 to 1N) turn to perform a corresponding packet transmission, sending an emergency packet corresponding to the emergency transmission mode.