If the Euler distance between the target node concerned and the border node is less than or equal to the diameter of the sensor node, coverage can also be realized through moving sensor nodes.
The reference sensor node is that node for which recording will be obtained for all the sets of vibration while the moving sensor nodes are those nodes on which only one recording have been taken for the particular set of vibration record.
(c) Reference sensor node on downstream truss and moving sensors on both upstream and downstream nodes to find the disparity between nodes if any.
When an object moves from one sensor node into another sensor node, the update action is triggered in both these sensor nodes.
According to the aggregation model proposed in DAB, when an object moves from a sensor node to its neighbor's sensor node, the update messages will be forward to the lowest common ancestor of these two sensor nodes.
Gathered data move from a sensor node to the nearest neighbor, are aggregated with the neighbor's data, and eventually reach a determined CH before finally being transmitted to the BS. Figure 3 illustrates the ideas of the PEGASIS protocol.
As the moving node passes by along a straight line, the distance between the moving node and the sensor node d(t) is d(t)=sqrt{(L_{0}-vt)^{2}+d_{0}^{2}}.
The reasons for different link qualities range from path loss to static and dynamic multipath propagation [24, 25] to fast moving or rotating sensor nodes [26, 27].
If a sensor node moves to a new location, it will establish pairwise keys with its new neighbors following the aforementioned public-key-based node joining procedure, and its old neighbors will also revoke the pairwise keys with it.
Robots can communicate with motes if they are in neighborhood, they are capable of picking up, moving and releasing a single sensor node in the environment, so to optimize them to shorten the trail between the nest and food.
