ECU Service Subscription During Network Updates to Limit Bus Load
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Solution Overview
Problem
Dynamic network updates in communication systems can lead to unexpected communication loads exceeding design expectations, causing inefficiencies and increased network traffic.
Innovation Solution
A communication network system where electronic control units select and adjust communication settings based on service identifiers, using offer and subscription messages to manage network updates, thereby reducing unnecessary message transmission and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new subscriber station is connected and the network is updated with reserved identifiers for dynamic communication, then the network system can perform unexpected communication scenarios, but a communication load exceeding design expectations is imposed
Solution Approach 1:
The system performs preliminary actions by pre-assigning reserved identifiers to potential service messages before actual network updates occur. This allows the network to adapt to new communication scenarios without immediately generating excessive traffic, as identifiers are prepared in advance but only activated when services are actually subscribed to.
Solution Approach 2:
The communication load is made dynamic through on-demand service subscription mechanisms. Instead of continuously transmitting all possible service messages, the system dynamically activates communication only when receiving-side electronic control units actually subscribe to specific services, allowing adaptability while controlling load based on actual needs.
2Loss of information
If all electronic control units receive all communication messages transmitted on the bus, then complete information availability is achieved, but unnecessary message transmission increases communication load
Solution Approach 1:
The system applies local quality by making information availability selective rather than universal. Each electronic control unit receives only the communication messages relevant to its subscribed services, determined by matching service identifiers in received messages against its subscription list. This ensures each unit gets complete information for its needs without receiving unnecessary messages.
Solution Approach 2:
Receiving-side electronic control units perform preliminary filtering by maintaining lists of service identifiers they are interested in receiving. Before processing incoming messages, they check whether the message's service identifier matches their subscriptions, thereby avoiding unnecessary processing and reducing effective message transmission volume while maintaining information availability for subscribed services.
Data Source
AI summary
The communication network system sends an offer message to the first communication bus by the providing-side electronic control unit when the network is updated. The electronic control unit selects whether or not to receive a service message provided by the providing-side electronic control unit by confirming the offer message. The receiving-side electronic control unit that has selected to receive the service message changes the settings to receive the service message. The receiving-side electronic control unit sends a subscription message to the first communication bus. Upon receiving the subscription message, the providing-side electronic control unit starts providing the service by the service message.