P. Venkitasubramaniam and L. Tong
Tech. Report , December 2004.
We consider sensor networks with multiple mobile access
points (APs),
where data from sensor nodes are collected by the APs
using the slotted
ALOHA random access. Under the performance metrics of throughput and
efficiency, we obtain obtain optimal coverage areas
for non-cooperative
and cooperative APs. When the mobile APs do not cooperate, we show that
the optimal strategy to maximize throughput is to activate completely
disjoint regions, whereas, in order to maximize efficiency, the APs have
to activate fully overlapped regions. When mobile APs
collaborate in
reception, the optimal strategy depends on the signal to noise ratio
(SNR). When SNR is below a threshold, the mobile APs
have to activate
completely overlapped regions. When SNR is above the threshold, the
optimal strategy is to activate disjoint areas.