Managing Hierarchically Structured DTN-Like Networks

Table 2

DTN management messaging categories.

Node category	Default messaging category	Downwards (manager  agent)	Upwards (agent  manager)	Horizontally (between managers)
Terminal	Minimal	No traffic	Heartbeat	No traffic
Vehicular	Basic	Subscription of heartbeat	Status update with most important information	Subscriptions and reports related to the status updates of neighbouring vehicular nodes
Transferable	Detailed	Subscription of the status of the vehicular node and a summary of statuses of terminal nodes	Status update with detailed information	Subscriptions and reports related to the status updates of neighbouring transferable nodes
Core	Full	Subscription of the status of the transferable node. Subscription of an overview of the other transferable nodes and the vehicular nodes below	No traffic	Subscriptions and reports to exchange all relevant information that is available between the managers of the core