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A mobile ad hoc network (MANET) is a self-configuring network of mobile nodes connected by wireless links without fixed infrastructure, which is originally designed for a cooperative environment. However, MANETs are subjected to a variety of attacks by malicious nodes, in particular for attacks on the packet routing. Compared with traditional cryptosystem based security mechanisms, trust-enhanced...
The conventional methods of improving the performance of wireless sensor network focus on proposed algorithm mechanism to increase the packet delivery ratio, reduce the delay and so on. In this paper, firstly we propose an adaptive sleep scheduled scheme to reduce the energy consumption of the whole network. Based on this, we introduce weight w to measure the importance of data. We assume that the...
In this paper, we study the cluster dynamics during network evolution in human mobile network by analyzing the GPS trajectories of taxi collected in two different urban environment. We observe that the size distribution of small clusters exhibits persistence over time, and the behavior of large clusters becomes the key to distinguishing the network state at different time step during the evolution...
In mobile ad hoc networks (MANETs), service composition faces severe challenges such as the lack of central server, node mobility and wireless network failure, which are usually not considered in web service composition on Internet. This paper designs and implements an on-demand service composition protocol for MANETs with consideration of quality of service (QoS). Based on the well-known Dynamic...
Because of user mobility, highly dynamic, error-prone wireless channels, the QoS control for mobile Peer-to-Peer (MP2P) streaming media has to face considerable challenges. Given to the advantages of policy management, we develop a policy-based QoS control (PBQC) architecture to provide QoS assurance dynamically and automatically in mobile network environment. And we also propose a MP2P streaming...
Roaming across heterogeneous wireless networks such as wireless wide area network (WWAN) and wireless local area network (WLAN) poses considerable challenges, as it is usually difficult to maintain the existing connections and guarantee the necessary end-to-end quality-of-service (QoS). This paper proposes a novel end-to-end QoS guaranteed seamless handover scheme, which can maintain the connections...
Mobile sensor networks comprise of mobile and static sensor nodes set up for the purpose of collaboratively performing tasks like sensing a phenomenon or monitoring a region. Sensor deployment is an important problem in mobile wireless sensor networks, which affects the performance and lifetime of the networks. This paper presents a distributed deployment algorithm for mobile sensors. Our algorithm...
Ad hoc network is one sort of multi-hop, self-organization and dynamically changing network. The Ad hoc On-Demand Distance Vector (AODV) protocol is an on-demand protocol specialized for mobile ad hoc network. Future network should have cognitive characters and the collection of elements that make up the network observes network conditions and then, using prior knowledge gained from previous interactions...
In uneven ubiquitous computing environments, there exists no one design paradigm, such as client/server, code on demand, remote evaluation or mobile agent, which can do well in all types of contexts. Thus, it is an important task to evaluate the performances of these paradigms in various environments in order to select and use the optimal paradigm in the specified contexts. This paper analyzes the...
Selfish behaviors significantly affect the overall performance of mobile ad hoc networks (MANETs). Reputation systems have been proved to be an efficient way to block such behaviors in MANETs. Several reputation models based on subjective logic have been proposed to improve the reputation mechanism, in which an uncertainty value is introduced for reputation computation when the local information is...
Mobile Augmented Reality (MAR) is an emerging visual computing application for the mobile Internet device (MID). In one MAR usage model, the user points the handheld device to an object (like a wine bottle or a building) and the MID automatically recognizes and displays information regarding the object. Achieving this in software on the handheld requires significant compute processing for object recognition...
As the existence of diverse network technologies, QoS signaling is needed to guarantee the end-to-end QoS for users in complex network environment. Compared with the previous QoS signaling with resource reservation, NSIS (next steps in signaling) proposed by IETF is better in flexibility and scalability. This paper proposes a new mobility-aware scheme for QoS NSLP (NSIS signaling layer protocol) in...
For mobile ad-hoc wireless network, the route protocol is very important. This paper proposes a modified CBRP scheme based on the cloud model to improve the performance. And some experiments are conducted, the results show that the ad-hoc network will be lower average end-to-end delay and higher packet delivery ratio with the proposed scheme.
Mobile computing environments pose two challenging problems for the design and configuration of mobile services: constant changes of computation contexts and resource limitation of mobile devices. This paper presents a dynamic software configuration approach implemented by using different design paradigms during execution time. After analyzing the features of these paradigms, we propose the selection...
The rapid popularity of wireless networks and portable devices spurs mobile users to access various information services. Service provision in ubiquitous computing has become a challenging issue. In this paper, we present a user-centric service provision model (TJCSPM). UCSPM is designed to support user-oriented quality of service (QoS) evaluation and dynamic service delivery, according to various...
In the mobile and resource-constrained ubiquitous computing environments, we need an effective quality of service (QoS) model to support dynamic service selection in tune with the variation of context. To serve this purpose, we explore the concept of QoS and propose a context-based QoS model with hierarchical structure. Based on the context model, the QoS model can identify different types of context...
Due to the increasing proliferation and serious resource constraints of mobile devices, using the rich-resource server can help the mobile client to perform some tasks for improving performance and saving resources is more and more needed in pervasive computing. Remote execution is a static software configuration approach that is unsuitable for constantly changing environments. In this paper, we present...
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