  We introduce the novel concept of mobility diversity for mobile sensor or
communication networks as the diversity introduced by transmitting data over
different topologies of the network. We show how node mobility can provide
diversity by changing the topology of the network. More specifically, we
consider a mobile network of a sensor node and a number of sink nodes which are
all moving randomly according to different Wiener process mobility models.
Assuming that the network topology evolves with time and assuming that the
connectivity of the sensor node to at least one sink node is needed for
successful communication, we calculate three performance measures for this
network, i) the expected number of time instants, where the sensor node is
connected to at least one sink node, ii) the probability of outage, being the
probability that no sink node is in the vicinity of the sensor node during the
observation interval, and finally, iii) the maximum number of consequent
failures in the communication. Our theoretical and numerical analysis show that
increasing the mobility parameter of the sensor node increases the average
number of successful transmissions, decreases the probability of outage, and
reduces the maximum delay in the senor-sink communication.
