Relay Device Aggregating Wakeup Frames to Reduce Bus Load
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Solution Overview
Problem
In large vehicle communication systems with numerous ECUs connected via a gateway device, the selective wakeup function increases bus load due to the need for multiple ECUs to share information on their wake-up states, potentially hindering vehicle control signal transmission and reception.
Innovation Solution
A relay device aggregates operating mode information from multiple wakeup frames to reduce the number of patterns, preparing a single aggregated wakeup frame for transmission across buses, thereby reducing communication load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple ECUs exchange wakeup frames to manage sleep/wakeup states, then selective wakeup function is achieved, but bus load increases
Solution Approach 1:
The patent combines multiple individual wakeup frames from different ECUs into a single aggregated wakeup frame. The gateway device collects wakeup patterns from multiple ECUs, merges them into one comprehensive frame containing all necessary wakeup information, and transmits this single frame to wake up multiple ECUs simultaneously. This merging approach maintains the selective wakeup function while significantly reducing the number of frames transmitted on the bus.
2Reliability
If multiple wakeup frames are transmitted to manage wakeup states, then communication between ECUs is enabled, but transmission efficiency decreases
Solution Approach 1:
The patent merges multiple wakeup frame transmissions into a single aggregated frame transmission. Instead of sending separate frames for each ECU's wakeup state, the gateway consolidates all wakeup patterns into one frame, thereby maintaining reliable communication of wakeup states while dramatically improving transmission efficiency by reducing the total number of transmissions required.
3Ease of operation
If individual wakeup frames are sent to each ECU, then precise wakeup control is achieved, but power consumption increases
Solution Approach 1:
The patent merges multiple individual wakeup frame transmissions into a single aggregated wakeup frame that can wake up multiple ECUs at once. This approach maintains precise control over which ECUs are woken up (by including only the necessary wakeup patterns in the aggregated frame) while reducing overall power consumption by minimizing the number of transmission events and allowing ECUs to remain in low-power sleep states longer.
Data Source
AI summary
A relay device in a communication system receives a plurality of wakeup frames from one or more than one communication device connected to each bus of a plurality of buses via a corresponding port. The relay device obtains an aggregated wakeup pattern by aggregating information on an operating mode of each communication device included in the plurality of wakeup frames so as to include predetermined information to be transmitted and received and reduce the number of wakeup patterns. By using the aggregated wakeup pattern obtained by aggregating the information on the operating mode, a wakeup frame for transmission to each bus via the corresponding port is prepared.