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In this paper, we first investigate the relationship between packet length and packet loss rate in the Gilbert wireless error model. Then we propose a congestion control scheme which can detect the nature of packet losses by sending large and small packets alternately. By means of updating factor and loss queue, this proposed scheme can adapt to the changes of network states quickly and improve delivery...
According to the shortcomings and deficiencies of Electric Power Monitoring System at present, this paper designs a kind of Electric Power Monitoring System based on ZigBee and GPRS. The system utilizes CC2430 as the ZigBee module, and designs the ZigBee Coordinator and ZigBee monitoring terminal nodes. The system uses GPRS for remote transmission to realize a real wireless system. The system can...
The fast response of highway emergency response system (HERS) need all departments cooperating with each other and real-time information sharing. In this paper, an integrated digit platform using geographical information system on transportation (GIS-T) is described. Based on the system analysis, the construction of HERS is established and the system functions are designed. Taking into account the...
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