Embedded Rule-based Management for Content-based DTNs - Advances in Network-Embedded Management and Applications - page 93

DTN

RON PDP

RMOON

lubot
drivers...

USB / Serial

usb4all

modules...

Sensors

Fig. 3. Architecture of a DEMOS sensor node

{ Carriers. These are the mobile nodes that relay information from the Sensor
Nodes to Collector in an opportunistic fashion. Usually these are children's XO
laptops.
{ Management Station. All data is summarized and prepared for analysis here.
Also, rules are prepared and deployed from here.

Sensor Nodes, Carriers, and Collectors participate in an Opportunistic Network,
and thus run the supporting service, RON. Additionally, Sensor Nodes run a mon-
itoring service attached to the sensing hardware.

4.1 Common Node Architecture

On Figure 3 the general architecture of DEMOS sensor node is shown. RON and
associated PDP modules are responsible for the opportunistic routing of messages.
They must be available on all edge and mobile nodes participating in the DTN.
RON is the routing service, and it relies on PDP, a general purpose Policy Decision
Point, to take decisions that aect the routing. The PDP service will be described
with more detail in the Section 5.2.
Rmoon is the monitoring service, responsible for collecting and sending sensor
data through the network. The internal architecture of the Rmoon module and
associated sensor device will be described in more detail in Section 5.3.
Mobile nodes for DEMOS only have the RON and associated PDP modules
installed. PDP module is available for other uses besides opportunistic routing.