We consider a hybrid wireless sensor network with regular and

transmit-only sensors. The transmit-only sensors do not have the

receiver circuit (or have a very low data-rate one), hence are cheaper

and less energy consuming, but their transmissions cannot be

coordinated. Regular sensors, also called cluster-heads, are

responsible for receiving information from the transmit-only sensors

and forwarding it to sinks. The main goal of such a hybrid network is

to reduce the cost of deployment while achieving some performance

goals (minimum coverage, sensing rate, etc).

In this paper we are interested in the communication between the

transmit-only sensors and the cluster-heads. Since the sensors have no

feedback, their transmission schedule is random. The cluster-heads, on

the contrary, adapt their reception policy to achieve the performance

goals. Using a mathematical model of random access networks developed

in [BlaszczyszynRadunovic2007] we define and evaluate packet

admission policies for different performance criteria. We show that

the proposed hybrid network architecture, using the optimal policies,

can achieve substantial dollar cost and power consumption savings as

compared to conventional architectures while providing the same

performance guarantees.

In  INFOCOM

Publisher  IEEE Communications Society
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