Vehicle Network Node Wake-Up Reason Transmission
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Solution Overview
Problem
Current vehicle network technologies, such as CAN and FlexRay-based networks, fail to meet the higher transmission rate and system expandability requirements of enhanced safety and infotainment systems, and the MOST-based network is costly, leading to the use of Ethernet-based networks, which lack awareness of wake-up reasons for communication nodes transitioning from sleep to normal mode.
Innovation Solution
An operation method for communication nodes in vehicle networks that includes transitioning from sleep to normal mode upon detecting an event, transmitting a wake-up signal, generating and transmitting a network management (NM) message with information on the wake-up reason, and periodically updating the operation status, allowing other nodes to operate based on the identified reason.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If communication nodes transition to sleep mode to save energy, then energy consumption is reduced, but wake-up reason information is lost
Solution Approach 1:
The transmitting node generates and transmits the NM message containing wake-up reason information before transitioning to sleep mode. This preliminary action ensures that the information is already in the network when the node wakes up, eliminating the need to maintain continuous awareness while still preserving the wake-up reason data.
Solution Approach 2:
The NM message acts as an intermediary carrier that transfers wake-up reason information from the transmitting node to the receiving node. This allows the receiving node to obtain the wake-up reason without the transmitting node needing to remain active, thus enabling energy savings while preserving information.
2Loss of information
If communication nodes remain in normal mode to maintain awareness of wake-up reasons, then wake-up reason information is preserved, but energy consumption increases
Solution Approach 1:
The transmitting node transitions to sleep mode after transmitting the NM message and only wakes up at predetermined intervals to transmit subsequent NM messages. This periodic action pattern allows the node to conserve energy while still maintaining network functionality and information sharing at appropriate intervals.
3Device complexity
If wake-up signal is transmitted without NM message, then communication is simple, but receiving node cannot identify wake-up reason
Solution Approach 1:
The NM message is merged with the wake-up signal transmission process. The wake-up signal and NM message are transmitted together in a coordinated manner, combining the function of waking up the receiving node with the function of conveying wake-up reason information, thereby avoiding separate complex communication steps.
4Loss of information
If NM message is transmitted frequently to ensure information availability, then wake-up reason information is always available, but network traffic increases
Solution Approach 1:
NM messages are transmitted periodically at predetermined intervals rather than continuously or on-demand. This periodic transmission ensures that wake-up reason information is refreshed regularly while minimizing unnecessary network traffic, achieving a balance between information availability and traffic reduction.
Data Source
AI summary
An operation method of a communication node in a vehicle network may comprise performing a transition of an operation mode of the communication node from a sleep mode to a normal mode when a predetermined event is detected; transmitting a wake-up signal when the operation mode transitions from the sleep mode to the normal mode; generating a network management (NM) message including information indicating a wake-up reason corresponding to the wake-up signal; and transmitting the NM message.