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Wireless Sensor Networks (WSN), consisting of a large number of sensor nodes connected through wireless medium has emerged as a ground-breaking technology that offers the unprecedented ability to monitor the physical world accurately. Because of resource-constrained nature of sensor nodes, a number of issues have emerged out of which energy-efficiency is an important matter of concern. In this work,...
Analytical studies of Medium Access Control (MAC) layer protocols can be used to improve the performance of multi-hop Wireless Sensor Networks (WSNs) in the presence of hidden stations. The selected MAC layer protocol should conform to the distributed nature of the WSNs. The IEEE 802.11 MAC layer with Distributed Coordination Function (DCF) is well suited to WSNs. Analytical studies of IEEE 802.11...
In this paper, we analyzed the impacts of the Paris Metro Pricing (PMP) strategy that differentiates network services with price discrimination. We develop simple analytical models for both single flat pricing and the PMP pricing schemes to compare them for various user distributions. The comparison shows that 1) PMP increases the monopoly operator's revenue for various user distribution, and that...
Modeling TCP performance is an important issue which has attracted research over the past two decades. Most literatures are to measure the steady state throughput of TCP Reno, however, few existing literatures are on modeling the throughput of the other important TCP variant, TCP Selective Acknowledgment (Sack). In this paper, an analytic model for the TCP Sack steady state throughput is proposed...
Service discovery is vital in ubiquitous applications, where a large number of devices and software components collaborate unobtrusively and provide numerous services without user intervention. Existing service discovery schemes use a service matching process in order to offer services of interest to the users. Potentially, the context information of the users and surrounding environment can be used...
This paper proposes a new protocol to integrate the Mobile IP and MPLS protocols called B-MPLS. The proposed protocol is based on L2 information and a simple buffer technique. Performance analysis of proposed protocol is simulated by the Network Simulator (NS2). The primarily results show that the proposed mechanism grants seamless handover. The packet lost rate is much lower than that of mobile MPLS...
The wireless sensor networks is a network technique for the implementation of Ubiquitous computing environment. The nodes use the CSMA/CA for the communication. However, the number of nodes which are joined from the PAN coordinator is more increasing, also the competition and the overhead are more increasing. Therefore, the performance of current standard is decrease. In this paper, we design an efficient...
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