Selective Wake-Up Signal for Vehicle Network Nodes
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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 advanced safety systems like telematics and infotainment, leading to inefficient power consumption and unnecessary wake-up of communication nodes.
Innovation Solution
A selective wake-up technique that uses a wake-up signal with an identifier to specifically target communication nodes in a vehicle network, allowing the PHY layer unit to transmit the signal without waking up the controller unit if the node is not required, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wake-up signal is transmitted to all communication nodes in the vehicle network, then all nodes can be activated when needed, but unnecessary power is consumed at nodes that do not need to be woken up
Solution Approach 1:
The wake-up signal is segmented to include identification information that allows receiving nodes to determine whether they are the intended target. The PHY layer unit compares the identification information in the wake-up signal with its own node identifier, and only activates the controller unit if there is a match. This segmentation approach resolves the contradiction by enabling selective wake-up of only necessary nodes while maintaining reliable wake-up functionality.
2Speed
If the controller unit is always kept in ON state to respond to wake-up signals, then response time is reduced, but power consumption increases significantly
Solution Approach 1:
The controller unit dynamically transitions between OFF and ON states based on whether it is the intended target of a wake-up signal. When the PHY layer unit determines that the controller unit should remain in OFF state (by comparing node identifiers), power consumption is minimized. When activation is necessary, the controller unit transitions to ON state to handle the wake-up event, ensuring appropriate response speed only when needed.
3Speed
If traditional Ethernet-based network is used to support high transmission rates, then transmission rate requirement is met, but cost increases
Solution Approach 1:
The vehicle network utilizes existing Ethernet infrastructure and protocols to provide high-speed communication capabilities. The wake-up signal mechanism with identification information enables efficient network management and power saving features that reduce overall system operational costs, making the Ethernet-based solution more economically viable while meeting transmission rate requirements.
Data Source
AI summary
An operation method of an end node including a physical (PHY) layer unit and a controller unit in a vehicle network includes: detecting, by the controller unit, a local event; in response to detecting the local event, transitioning an operation state of the controller unit from an OFF state to an ON state; transmitting, by the controller unit, to the PHY layer unit an indicator requesting to transmit a wake-up signal in accordance with the local event; and transmitting, by the PHY layer unit, the wake-up signal including an identifier of at least one end node required to be woken up by the local event.