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Wireless actuators are small scale devices that can receive/accept instructions and act on their environment. The IP Multimedia Subsystem (IMS) is a key component for 3G networks. It aims at seamless provisioning of multimedia services. Combining actuation capabilities with IMS capabilities will certainly enable novel value added services. This paper proposes an architecture for the integration of...
For ad-hoc home networks without central coordinator, IEEE 802.11 systems merely support service differentiation. In many usage scenarios of a typical home network with applications requiring a strict quality of service (QoS), this MAC functionality is not sufficient. In order to counteract this problem, we developed in previous works a modified MAC scheme based on the IEEE 802.11 enhanced distributed...
This paper proposes an analytic model to study queuing effect on the handoff performance of Mobile IPv6 (MIPv6), which has not been particularly investigated in previous literature. The presented model regards handoff process as tandem service system, and adopts a simple two-moment approximation throughout the theoretic modeling. Without other specific assumptions, the model presents a generic approach...
In this paper, we design and implement a hybrid WiMAX network testbed that integrates the NCTUns network emulator with a real-life WiMAX network. This hybrid WiMAX network testbed can seamlessly connect virtual networks (emulated by NCTUns) to a real-life WiMAX network. Thus, in this testbed real-life applications on real machines can exchange data with those on emulated (virtualized) network nodes...
The WiMedia specifications for high data rate ultra-wideband communication is an emerging protocol with its first products available on the market. One use case is wireless networking based on the Internet Protocol. Conference rooms or offices can be equipped with access points to provide high speed Internet access. Our intention is to establish WiMedia wireless networks in public transportation vehicles,...
In this paper we propose a fast and energy efficient service provisioning approach. In our work, we focus towards the management of already discovered services. We assert that if the sensor nodes share the important service information among each other, then the service re-discovery can be reduced at greater extent. Hence a significant amount of Service Discover (SD) time and the network energy cost...
Wireless mesh networks (WMNs) are comprised of nodes with multiple radio interfaces and provide broadband residential internet access or connectivity to temporal events. Our goal is to simplify the network deployment of such a mesh network, and towards that we are presenting procedures for automatic configuration and optimisation of the network. We first present an architecture framework that supports...
Internet Protocol (IP) telephone, a new way of communication, is growing rapidly in the telecommunication industry. A number of major phone carriers are competing to gain customers in home and business markets. However, there are very few schools at the university level that offer IP Telephone courses. It is rare to find documentation on curriculum and laboratory development, even though some schools...
In this paper, UDP transfer scheme is presented to address data uploading of a measurement system. Based on principal analysis, functional block of UDP transfer module is discussed. Then network interface circuits, UDP protocol stack and usage of limited random accessed memory is detailed. Experiments showed that applied UDP module met requirement of data transfer. Finally, combining with specific...
For the increasing demand on campus network, IPv6 (Internet protocol version 6) is going to replace the IPv4 protocol. IPv6 is playing an important role in many fields. Wireless sensor networks (WSNs) are undergoing rapid progress and attracted the attention of both the academic and the industrial research community in the last few years. This paper reports on the development of these protocols at...
QoS-aware service composition is to compose a composite service by selecting atomic services from service providers to maximize QoS while satisfying all the QoS constraints imposed by user requests. Many proposed schemes for service composition are atomic task oriented (ATO). Due to the possible large number of tasks contained in a composite service and the wide range of candidate services capable...
The paper shows a working project that organizes a set of jobs to improve the learning of computer networking. It uses virtual machine to create a portable laboratory on which students do hands-on exercises anywhere. It first developed an ability indicator of computer networking. Then an online curriculum material is made and available on the Internet. Students are learning the computer networking...
The purpose for integration system is to provide a unified, global view to the user over various heterogeneous sources. To answer user queries, a data integration system employs a set of semantic mapping between and mediated schema(global schema) and schemas of data sources (local schema). Such data integration raises main challenging issue: (1) Scheme creations and (2) Schema mappings. In order to...
The aim of this paper is to solve the blind source separation (BSS) problem using the temporal independent component analysis (ICA) model. In contrast to ordinary ICA, except for independent assumption, the temporal structure of the source components is taken into account. After combing the virtues of both high order statistics and the temporal second-order information of the source signals, we can...
Part of the role of universities is, today as from their earlier times, to prepare students for a productive role in the society. In this context, the role of curriculum development is to ensure that students are able-if so they wish-to acquire skills that are in demand in the work market. This is of uttermost importance in areas as IT where weak choices by students and/or universities might have...
Mobility is one of the major features of wireless communication systems. In Universal Mobile Telecommunications System (UMTS) All-IP networks, two new approaches to support real-time relocation of Serving Radio Network Controller (SRNC) were introduced by 3GPP TR 25.936. Both of these approaches duplicate packets during the relocation process, which consumes extra resources and also some packets may...
This paper describes the windows CE development platform and Embedded Visual C++(EVC) program development environment, studies the TCP/IP protocol and Socket principle, then using a set of network communication functions which is provided by WinSock API to achieve network communication program between the PDA and other network devices. A detailed implementation and programming steps are given in an...
This paper aims to develop the system of powerful computer laboratory class by simulation the ideal learning procedure, teachers and their students can keep in touch with each other in 2-way and immediately communication on Internet. This system can enhance the learning of computer laboratory class powerfully in 3 aspects: controlling, teaching, and evaluating on computer network technology with client/server...
Routing is the process to distribute and send the packets from one node to another so as to reach the desired node in the network. In static wireless networks, the routing does not get affected by the energy constraints. We focus on the static networks and discuss the constrained multipath, distributed and load balancing routing algorithm by considering a undirected graph G(V,E) and trace the algorithm...
Peer-to-Peer (P2P) systems receive growing acceptance, especially DHT based P2P systems. DHT based P2P systems have an inherent workload uneven distribution problem. Skewed workload distribution will influence the availability and the performance of the system seriously. In this paper, an algorithm based on local state for load balancing in DHT based P2P systems under churn, LSB-Chord (local state...
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