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In many adverse or dangerous application environments, parameters in path loss model for wireless channel are unknown, and neighbor nodes are unable to range using RSSI. Forcing on this kind of environment, a localization algorithm based on Particle Swarm Optimization and the mobile anchor in sensor networks is proposed in this paper. Localization process is converted into non-linear constraint optimization...
The preservation of temporal dependencies at runtime among continuous media for mobile distributed systems (MDS) is a key issue for emerging mobile applications, such as medical signal monitoring and interactive multiuser games. The preservation of temporal dependencies among continuous media and simultaneous mobile distributed sources is an open research problem. This paper proposes a temporal synchronization...
Caching of frequently accessed data in mobile ad hoc networks is significant technique that can improve the date access availability and save the communication overhead. In this paper, we propose a novel scheme for cooperative cache placement in mobile ad hoc networks. In our scheme, cache place is developed to improve the utilization rate of caching data and the cache hit ratio. As a part of cooperative...
Advances in wireless communications along with improvements in hardware have allowed smart phones to interact with each other easier in an open environment where virus can diffuse. While many studies have modeled the spread of malware, little has been done to take into account different types of devices that may concurrently exist in a mixed wireless network. In this paper, we have therefore developed...
In wireless communications system attenuation and fading limit the channel capacity of a communications link. Cooperative diversity is a transmission technique to overcome fading, multipath and inter-channel interference. As an important part of "spatial diversity" systems, cooperative diversity involving multi hop data relays is a solution to improve propagation performance, expanding coverage...
We investigate the channel formation in a Mobile Ad Hoc Network (MANET) using the NS-2 simulator. The results show that the normalized node density is a good measure for predicting the performance of a MANET: for the normalized node density of 2.8 two nodes in a MANET running the AODV routing protocol stay connected 90% of the time. For the DSR protocol this is only 70%. The results may be used in...
The Battery-Sensing Intrusion Protection System (B-SIPS) [1] initially took a non-conventional approach to intrusion detection by recognizing attacks based on anomalous Instantaneous Current (IC) drain. An extension of B-SIPS, the Multi-Vector Portable Intrusion Detection System (MVP-IDS) validates the idea of recognizing attacks based on anomalous IC drain by correlating the detected anomalies with...
Mobile multimedia application design has taken precedence in the field of wireless communications due to the growing demand for mobile devices to perform multimedia functions. To sustain such high complexity and power hungry functions on battery-powered devices, power-aware concepts should be employed in the design of mobile multimedia applications. An effective power-aware design should serve two...
Illustrating how the CDMA 1x mobile network evolutes to EV-DO network. It carries out the EV-DO network planning and analysis based on the existing CDMA 1x mobile network, which includes selecting its propagation model, planning process and main parameters of the design, etc. It gives the reference values in the planning, and simulates by CNP simulation software. At last it puts forward some technical...
Inter-vehicular communication is an important research area that is rapidly growing due to considerable advances in mobile and wireless communication technologies, as well as the growth of microprocessing capabilities inside today's cars, and other moving vehicles. A good amount of research has been done to exploit the different services that can be provided to enhance the safety and comfort of the...
This paper derives analytical expressions for the probability of link availability and the node degree distribution in mobile ad hoc networks. The expressions (1) account for system parameters such as the node density, node transmission range, and the radio channel fading; and (2) hold for an arbitrary mobility model with initially uniformly distributed spatial nodes that are allowed to move only...
This paper presents "SimPlayGround" - a framework for the stimulative evaluation of reactive and proactive power-management approaches in distributed energy harvesting systems. Our simulation framework combines the simulation of wireless communication, the behavior of reversible power supplies and the dynamics of power consumption. It supports models of the environmental power and energy...
Mobile ad hoc networks consist of mobile wireless devices which autonomously organize their infrastructure. In such networks, a central issue, ensured by routing protocols, is to find a route from one device to another. Those protocols use cryptographic mechanisms in order to prevent malicious nodes from compromising the discovered route. Our contribution is twofold. We first propose a calculus for...
The Cisco® MWR 1941-DC Mobile Wireless Edge Router is a cell-site access platform specifically designed to optimize, aggregate and transport mixed-generation Radio Access Network (RAN) traffic. It is used at a cell site as part of an IP-RAN or Cell Site DCN solution. It generates revenue from new cell-site IP-based services. In this paper, we introduce an IP RAN solution in which the MWR 1941-DC extends...
In this paper, we have presented an opportunistic multi-server scheduling scheme that distributes traffic on multiple wireless interfaces of a mobile router to improve service guarantees for competing flows during mobility. The proposed adaptive, scalable, multi-server (ASM) scheduling scheme extends guaranteed-rate(GR) service model to ensure bounded service delays for each packet of flows in accordance...
In this paper, based on a two-concentric-quasi-sphere 3-D M-M geometrical model via pondering the uniform elevation angle (EA) probability density function (pdf), the closed-form expression of the 3-D M-M wideband space-time-frequency cross-correlation function (STF-CF) with uniform circular array (UCA) configuration is derived. The STF-CF with distinct values of the maximum EA regarding propagation...
Mobile ad hoc networks are self organizing multi-hop wireless networks with no fixed infrastructure. All the users in these networks are mobile. The mobiles communicate either directly or via other nodes of the network by establishing routes. The mobility of nodes causes the existing links to be break frequently. So if we can predict future movement, the resources reservation can be made before be...
A novel password input system through receiving the telecommand of the smart phone by the embedded bluetooth module is presented in this paper. This system can prevent the disclosing of the password from peeping and the transmission of the diseases during the outbreak of infectious diseases. The bluetooth wireless communication between two ARM9 development boards was studied in detail and implemented...
The wireless ubiquitous network and various communication services are expected to be realized. The wireless ubiquitous network is defined as the converged network to integrate the mobile network with the fixed IP based network. First, the concept of wireless ubiquitous network architecture is shown which is based on IMS standardized by 3GPP. Next, Parlay is described as the solution of Open API approach...
The work presents a decentralized protocol that allows self-organization of autonomous wireless devices in mobile mesh networks. In the resulting infrastructure the routing and information services are provided in a peer-to- peer fashion. Both services are performed through multi- hop radio transmissions among participant nodes with no fixed infrastructure required and avoiding to use broadcast of...
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