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A local-area and energy-efficient (LAEE) evolution model for wireless sensor networks is proposed. The process of topology evolution is divided into two phases. In the first phase, nodes are distributed randomly in a fixed region. In the second phase, according to the spatial structure of wireless sensor networks, topology evolution starts from the sink,(More)
GSM-R is a railway communication system based on the GSM technology. With the widely develop of high-speed rail, the GSM-R quality of service (QoS) is becoming much more important than ever. We analyze GSM-R by measuring field coverage and radio field coverage model, deducing the Doppler frequency offset, giving the upper and lower limits of overlap in(More)
Railway digital radio system, GSM-R, is a dedicated system for railway based on GSM system, which shoulders the demand of dedicated dispatching communication for railway. So it is extremely important to research the data transmission of GSM-R. In this paper, a data transmission method has been proposed, based on the actual measurement report of GSM-R and a(More)
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