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FUNDAMENTAL PERFORMANCE LIMITS OF WIRELESS SENSOR NETWORKS

Understanding the fundamental performance limits of wireless sensor networks is critical towards their appropriate deployment strategies. Both the data transmission rate and the lifetime of sensor networks can be constrained, due to interference among the transmissions and the limited energy source of the sensor. In addition to presenting the general results with respect to the maximum sustainable throughput of wireless sensor networks, this chapter focuses on the discussion of the energy-constrained fundamental limits with respect to the network throughput and lifetime. With an adequate definition of operational lifetimes, our asymptotic analysis shows that, with fixed node densities, operational lifetime of sensor networks decreases in the order of 1/n as the number of initially deployed nodes n grows. Even with renewable energy sources on each of the sensors (e.g., solar energy sources), our analysis concludes that the maximum sustainable throughput in energyconstrained sensor networks scales worse than the capacity based on interference among concurrent transmissions as long as the physical network size grows with n in the order greater than log n. In this case, when the number of nodes is sufficiently high, the energy-constrained network capacity