In-Vehicle Node Wake-Up Signaling for Sleep-State Recovery
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Solution Overview
Problem
In in-vehicle communication systems, the second node may unintentionally transition to a sleep state due to unexpected factors during communication with the first node, leading to disrupted communication.
Innovation Solution
The system includes a first node that can activate itself in response to an activation factor, transmit an activation request signal to a second node via a communication line, and retransmit the signal when a transmission condition is met, ensuring the second node remains active for continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If nodes remain in sleep state to save energy, then energy consumption is reduced, but communication reliability deteriorates when unexpected factors cause unintentional sleep transitions
Solution Approach 1:
The system performs preliminary actions by having the first node continuously monitor communication status and prepare activation request signals in advance. When the second node unintentionally transitions to sleep state, the first node can immediately transmit the pre-prepared activation request signal to wake up the second node, ensuring quick recovery without delaying communication restoration.
Solution Approach 2:
The system implements feedback mechanisms where the first node monitors whether the second node is properly activated and communicating. If communication fails or the second node transitions to sleep state, the first node detects this through feedback signals and retransmits activation request signals accordingly. This closed-loop feedback ensures communication reliability while allowing nodes to sleep when conditions permit.
2Reliability
If activation request signals are transmitted frequently to ensure node wakefulness, then communication reliability is improved, but energy consumption increases
Solution Approach 1:
The system uses periodic action by transmitting activation request signals only when necessary - specifically when the first node detects that the second node has unintentionally transitioned to sleep state. Rather than continuous transmission, the system employs conditional periodic transmission based on communication status monitoring, thereby maintaining reliability while minimizing energy consumption from unnecessary signal transmissions.
Solution Approach 2:
The system enables self-service where each node monitors its own and partner node's communication status and autonomously determines when activation request signals are needed. The first node independently detects communication failures or sleep transitions and initiates retransmission without external intervention, optimizing the balance between reliability and energy usage based on actual communication needs.
Data Source
AI summary
An in-vehicle communication system includes a first node and a second node configured to perform communication with the first node via a first communication line in accordance with a predetermined communication standard. The first node is configured to activate the first node in response to occurrence of an activation factor in the first node in a sleep state, transmit an activation request signal to the second node, and transmit the activation request signal to the second node via the first communication line when a transmission condition is satisfied with the second node. The second node is configured to be activated upon receiving the activation request signal from the first communication line while the second node is in the sleep state.