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Although advance network planning and dense node deployment, wireless sensor networks (WSNs) may achieve the required performance, it still face the fundamental challenge of meeting stringent power and time requirements using nodes with limited sensing capacities. To better cope with the power consumption problem, mobile sensor nodes can be introduced to dynamically reconfigure the sensor network...
For mobile multi-hop wireless network, IEEE 802.16j/MR network can not only supply large area wireless deployment, but also provide high quality network service to mobile users. In this paper, we will be focusing on QoS supporting for mobile users in the IEEE 802.16-MR network. The probability of a mobile user who visits a RS is known beforehand. With the same visiting probability of each RS and the...
Wireless mobile multimedia communications are being greatly increased in the number of users, diversity of applications and interface technologies. Future mobile based Internet will accommodate various wireless technologies and also will need to provide sufficient end-to-end QoS (Quality of Service) mechanism to provide enhanced user's satisfaction. In this paper, we propose a new adaptive end-to-end...
The advancement in wireless networking technologies and portable devices has motivated the explosive interests in heterogeneous wireless environments. However, the mobility and diversity of both devices and users bring new challenges for the design of mobile Internet applications. Seamless mobility support has always been one of the key problems. In this paper, we study context-aware adaptation for...
This paper analyzes the problems in the wireless network caused by using minimum hop count as its routing metric, and discusses ETX metric which invented by De Couto to solve these problems and the shortage of it in mobile environment, then modifies it by relatively counting as to make it suitable for such environment. This paper uses the new ETX as a metric for the OLSR routing protocol, and proves...
Mobile wireless networks have fascinating characteristics of rapid deployment and network connectivity anywhere and anytime. Due to their very nature of being mobile, grievous security issues may arise, for which some homogeneous solutions have already been proposed. However, each node may have its own security requirements depending on the available resources and the services or applications it uses...
Low-power personal area networks (LoWPANs) are still in its early stage of development, but the range of conceivable usage scenarios is tremendous. The numerous possible applications of Wireless Sensor Networks (WSNs) make obvious that mesh and multi-technology topologies will be prevalent in LoWPAN environments and mobility support will be a necessity. Mobility based communication can prolong the...
In realistic mobile heterogeneous environment, the quality perceived by user is variable and dependant on following major factors: available bit rate variation, packet loss and latency. Even though QoS management is enabled in most modern telecommunication systems, it does not ensure the actual end-user perceived quality of service level. Therefore, to make sure that operator follows SLA provisions,...
In this paper, we introduce cognitive wireless network for a disaster information system based on dynamic network reconfiguration method to improve the connectivity. Our network system is consisted of multiple mobile routers based on currently available wireless LANs including IEEE802.11b,g,j,n, IEEE802.16 (WiMAX), cellular networks. Using those different standardized wireless networks, the disaster...
The recent advances in radio and embedded system technologies have enabled the proliferation of wireless microsensor networks. Such wirelessly connected sensors are released in many diverse environments to perform various monitoring tasks. The effectiveness of these networks is determined to a large extent by the coverage provided by the sensor deployment. The positioning of sensors affect coverage,...
Contract-less wireless plans, in which customers are not locked into terms with providers, are becoming prevalent. The next step in this evolution is a contract-less competitive mobile wireless market in which a customer can, quite fluidly and seamlessly, choose to switch amongst wireless providers based on competitive terms at almost any time or place. This paper explores the concept and design of...
We study the throughput capacity of mobile wireless ad hoc networks with infrastructure support. Mobility and infrastructure support independently have been shown to be effective ways to improve capacity, but few work has analyzed the impact of their combination. In our work we consider an ad hoc network with n users and k base stations. All base stations are wired to each other with bandwidth c(n)...
Body Sensor Networks (BSNs) form a promising technology to supply healthcare to an ageing population. A large number of sensor devices, radios and MAC protocols are being developed. However, current solutions all assume a single-hop topology, while research results confirm the need for multi-hop topologies. In these multi-hop networks, because of the small scale of a BSN, node mobility will arise...
In this work, we present a monitor and rescue system utilizing hybrid networks which is a integration of stationary sensor networks and mobile sensor networks: stationary sensor networks comprised of large numbers of small, simple, and inexpensive wireless sensors, and the mobile sensor network contains a set of mobile sensors (robots). The static sensors in our network have “monitoring” ability,...
The benefits of using mobile sink to prolong sensor network lifetime have been well recognized. However, few provably theoretical results remain are developed due to the complexity caused by time-dependent network topology. In this work, we investigate the optimum routing strategy for the static sensor network. We further propose a number of motion stratifies for the mobile sink(s) to gather real...
Relayed transmission is an interesting topic in cooperative diversity. Some researchers propose power allocation schemes for relayed transmission by only considering transmission through a fixed relay node. In our paper, we analyze a relayed transmission through a mobile relay node. We build up a transmission system model and determine the long term distribution characteristics of the movement of...
Care-dependent people need assistance to carry out the normal daily activities. A situation that many of these people have to face up is going to the doctor in order to obtain the needed drugs' prescriptions. This work presents a proposal to enable patients getting prescriptions from home, avoiding going to the health-care center. With the aim of achieving a natural user interaction, something necessary...
Single-carrier frequency-division multiple-access (SC-FDMA) has been adopted in the uplink of the LTE standard due to its lower peak-to-average-power ratio (PAPR) compared to orthogonal frequency-division multiple access (OFDMA). Recent activities in the LTE-advanced (LTE-A) standardization have focused on effective uplink transmit diversity schemes with low PAPR but without considering the performance...
Mobility modeling is important to analyze the network performance of protocols since it determines the network topology inducing the network performance. In this paper, we analyze the real trace data in military operations, and design a new mobility model for military units. Based on the military training trace data of the KCTC (Korea Combat Training Center) in Hong-Cheon, Korea, we investigate the...
A mobile ad hoc network has a dynamic topology. A route probably fails if intermediate nodes of the route have high mobility. In order to choose reliable nodes in a route, we define and quantify a novel routing metric called HBR that avoids choosing nodes with frequent failure history. Thus, route failure probability is decreased. We propose a routing scheme called HAODV based on the HBR metric. In...
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