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In this paper the problem of joint localization and map estimation is studied. The objective is to determine the location of a set of fixed nodes, e.g. access-points or base-stations in a wireless network using only distance measurements acquired by a node moving in the vicinity of the fixed nodes. It is assumed, that no prior information about locations of any of the nodes (fixed or mobile) is available,...
Wireless Web services, also called mobile services or M-services, provide access to Web services through wireless networks. In this paper, we propose novel access methods and multi-channel organization for mobile users to effectively access composite M-services in wireless broadcast networks. We define a few semantics for accessing broadcast based M-services and study their impact on access efficiency.
Traditionally, every mobile station (MS) riding in the mobile vehicle uses conventional connection to the base station (BS). However, in 802.16j mobile multihop relay (MMR) networks, one of the studied usage model is ldquocoverage on mobile vehiclerdquo. Therein, a relay station (RS) is mounted on a vehicle. The RS provides service to MSs riding on the vehicle by relaying their data to the mobile...
In this paper, we propose name resolution middleware that involves positional awareness to identify target hosts in wireless visible area communication (WVAC). WVAC is a wireless communication network that enables users to exchange information with nearby hosts, especially within the users' visible area, wherein the underlying network can be locally and temporarily constructed without the aid of any...
Fixed relaying is a concept which is becoming mature within the research community due to the advantages that it can provide for future network deployments. Mobile relaying, an extension of the fixed relaying concept, has lately been investigated to highlight a possible framework for its deployment alongside fixed relay strategies. This paper aims to present the way that mobiles relays can be used...
The characteristics of node-pair paths are a primary consideration in the design of routing protocols in mobile ad-hoc networks (MANETs). Existing research studies on MANET paths focus on their dynamics in the presence of node mobility and ignore the impact of network configuration such as node density and node transmission range. In this paper, we study MANET paths using a smooth mobility model,...
Simulating human mobility is important in mobile networks because many mobile devices are either attached to or controlled by humans and it is very hard to deploy real mobile networks whose size is controllably scalable for performance evaluation. Lately various measurement studies of human walk traces have discovered several significant statistical patterns of human mobility. Namely these include...
Cellular networks are expected to change to Multi-hop Cellular Networks (MCNs). While a mobile station and the base station have a direct link in a conventional cellular network, in MCN, mobile stations with unsatisfactory path to the base station, could instead relay their data through other mobile stations with better channel conditions. This can improve coverage and capacity, and reduce the total...
When the client moving very fast, WiMAX service and from within the Wi-Fi access to the scope of services. Then quickly leave the Wi-Fi access to the service area to another within the WiMAX service. At this time will result in a short period of time the number of frequently handoff vertical, Lead to system efficiency decline, service quality has declined with the situation. This study uses the NS2...
In the integrated next-generation wireless systems (NGWS), users are always connected to the best available networks and used to switch between different networks based on their service needs. It is an important and challenging issue to support seamless handoff management in NGWS. The objective of this paper is to develop a seamless handoff management protocol for NGWS. In this paper, a fuzzy logic-based...
Current mobile terminals are often equipped with several network interfaces, which may be of different access technologies, both wireless and cellular. It is possible to select dynamically the best interface according to different attributes such as the interface characteristics, user preferences and/or application preferences, ... MADM is an algorithmic approach suitable to realize a dynamic interface...
Among different techniques that provide mobile positioning, using the Received Signal Strength (RSS) is regarded as a low-cost solution which is applicable in a wide range of wireless networks. In this paper, we propose a cooperative RSS-based positioning algorithm that utilizes the additional RSS data of the short range communications between mobile stations (MSpsilas). We use a nonlinear least square...
In this paper we present empirical results from a study, examining the effects of environmental diversity on vehicle-to-vehicle link in vehicular ad hoc networks (VANET). And packet loss rate (PLR) and received signal strength indicator (RSSI) of the wireless link are measured. The results of the measurement indicate that environment affects the quality of the wireless link in VANET greatly; the average...
Mobile Backbone Networks are heterogeneous wireless networks in which a subset of the nodes are more capable than others. The more capable nodes are referred to as Mobile Backbone Nodes (MBNs), whose primary role is to provide a mobile infrastructure in order to facilitate reliable end-to-end communication between nodes in the Network. In this paper, we consider the problem of optimally placing the...
According to the mobility framework of IEEE 802.16e, a mobile station (MS) should scan the neighbouring base stations (BSs), for selecting the best BS for a potential handover activity. However, the standard does not specify the number of BSs to be scanned leaving room for unnecessary scanning. Moreover, prolonged scanning also interrupts data transmissions thus degrading the QoS of an ongoing connection...
Simulation methods have become an integral part of almost all aspects of networking research and particularly in the area of wireless networks. Any new protocol or methodology that is proposed for wireless networks almost always will be demonstrated using simulations. However, there is little evidence that existing models of physical layer signal propagation and signal strength calculations produce...
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