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This research aims to represent the ZigBee mesh routing and the performance under simulation environment for smart home. In the realistic smart home, researcher does not get some of the analysis and results. Hence, we designed and developed ZigBee best virtual smart home environment on Qualnet simulator. Finally, we suggest mixed-mode simulation methodology that integrates the smart home environment...
In recent years, issues of Wireless Sensor Networks (WSNs) have been widely studied. The energy is limited in WSNs. However, it always takes much energy to achieve highly accurate time synchronization. In this paper, a Spanning Tree-based Energy-efficient Time Synchronization (STETS) strategy for WSNs is proposed. In STETS, only a small number of sensor nodes in the WSN have the privilege to send...
During equipment tests, there exist many software faults such as incorrect design, inaccurate boundary, awful mistake managing, which result in equipment faults frequently. By systematic analysis of software test process and the equipment software's characteristics of close relation with the environment, user and operation, it is proved that there exist disadvantages among software verification tests'...
Wireless sensor network is composed of hundreds of sensor nodes involving in limited energy, efficient and low-energy consuming routing algorithm is the crucial problem to the routing design. In this paper, the LEACH protocol, which is a typical clustering routing protocol, has been researched and improved based on energy, the new algorithm is different from the LEACH in the method of determining...
A project of mobile value-added service based on P2P is proposed. In this project, wireless devices can build a P2P network dynamically and they can access and transmit information point to point. The idea will adapt to the 3G wireless network and it will become a effective solution for mobile value-added services on 3G. Utilizing JXTA and J2ME, a platform based the project is realized. The module...
Current frequency allocation scheme results in poor spectrum utility. In some frequency bands, the spectrum may not be fully utilized either on geographical or at temporal level. In addition, on some hot spot business frequency bands, spectrum resources become in short supply. Many papers discuss the new spectrum management policies, and the focus is dynamic spectrum access (DSA) technology based...
Under static frequency allotment scheme, each licensed operator is allocated a frequency band in which its user can transmit, but the spectrum may not be fully utilized either on geographical or at temporal level. On the other hand, on some hot spot business frequency bands, spectrum resources become in short supply. Dynamic spectrum access (DSA) technology based on cognitive radio is an effective...
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