d max denotes the maximum distance between the two mobile nodes.
In fact, routes from a mobile node to the MRs or to the gateways or between any two mobile nodes in the hybrid WMN may include non-stable links.
Figure 4 Illustration of the interactions among VDTN nodes: (a) a mobile node and a terminal node establishing contact; (b) a mobile node and a relay node establishing contact; and (c) two mobile nodes establishing contact.
Both scenarios consider three fixed terminal nodes, four mobile nodes, and two relay nodes.
Three different trajectories are considered, and the three mobile nodes move along them respectively.
(2). Figure 3 Example: a group of five mobile nodes movements using the RPGM model.
We determine the route expiration time between two connected mobile nodes using global positioning system (GPS).
To guarantee the communication of two mobile agent nodes in the neighbor cluster, the number of mobile agent nodes is limited by their communication ability.
Moreover, a cooperation scheme is applied where the location engine, apart from RSSI measurements from anchors, uses also RSSI measurements performed between mobile nodes, since two mobile WSN nodes are able to communicate with each other and to perform corresponding RSSI observations.
