In a personal communication system (PCS), a scheme for reforwarding call-terminating setup messages (SETUP messages) from a network or a cell station is used to guard against their loss. We have developed a method for evaluating the loss probability of a reforwarding scheme in which the network monitors the response messages from a personal station after forwarding a SETUP message to that perso...

We propose a framework for error robust real−time video telephony over wireless networks. In our approach we cope with packet loss on the downlink by retransmitting lost packets from the base station to the receiver terminal. The effect of lost packets is reduced using error concealment. Retransmitted packets are used for error recovery. In order to be able to use the retransmissions for error ...

In the cellular Base station (BS) network, energy consumption is not proportion to their carried traffic load. The 3G traffic displays high fluctuations both in time and over space also incurs energy waste, but energy consumption of current 3G network is not load adaptive. In this paper, we propose a Load-Adaptive Base Station Network (BSN), a solution that enables the BSN to adapt itself with ...

We propose an energy-efficient hierarchical cluster-based routing (HCR) protocol where nodes self-organize into clusters and each cluster is managed by a set of associates called head-set. Using round-robin technique, each head-set member acts a cluster head (CH). The sensor nodes transmit data to their cluster heads, which transmit the aggregated data to the base station. Moreover, the energy-...

A portable array for numerical data acquisition (PANDA) was designed and built in-house at the Center for Earthquake Research and Information (CERI), Memphis State University. The design goal was a transportable set of instruments that could record high-quality seismic data. By making modifications to traditional seismic network technology and using a super-microcomputer workstation for digital...

We present a formal speci!cation and veri!cation of the automatic circuit-breaking behavior of an electric power transformer station, using the synchronous approach to reactive real-time systems implemented by the data-4ow language SIGNAL. Synchronous languages have a mathematical model that supports the various phases of the development of a control system: speci!cation, veri!cation, simulatio...

A new and relatively straightforward approach to interpolating and spatially averaging air temperature from weather-station observations is introduced and evaluated using yearly station averages taken from the Jones et al. archive. All available terrestrial station records over the period from 1881 through to 1988 are examined. Called climatologically aided interpolation, or CAI, our procedure ...