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Mobile Databases with palmtops, cellular phones, car computers etc. may lead to disconnection and handoff issues due to which it is necessary to have consistent commitment of transactions in case of mobility. This paper proposes the new commitment protocol, maintains the strong transactional coherency, called as Modified Reliable Timeout Based Commit Protocol (MRTBCP), that supports off-line executions...
Recent research in human mobility patterns has shown truncated power law behavior for flight length and pause time distributions[8]. Various approaches have been applied to increase the efficiency of weighted clustering algorithms for mobile networks but no quantitative work has been done to exploit contextual mobility of human walk. In this paper we quantify the effect of human walk context through...
The railroad industry in North America is heavily involved in improving the broadband wireless connectivity of their railroad operations. We propose our approach of establishing a Mobile WiMAX test bed as a part of our collaborations with the Federal Railroad Administration (FRA) for investigating the performance of current and upcoming broadband wireless technologies in a railroad environment. The...
Most previous work on spectrum sharing in the cognitive radio (CR) networks did not take into account the influence of node mobility on link available time as well as the spectrum heterogeneity. In this paper, a spectrum sharing algorithm based on spectrum heterogeneity is presented for centralized CR network, meanwhile the individual CR users are free to be mobile. A prediction model of channel usage...
An active handoff decision strategy is proposed to improve the handoff performance in aviation data link. According to this strategy, the high-quality data link is maintained timely. The VDLM2 models are created in Network Simulator version 2 (NS2) environments. The end-to-end delay and signal quality are analyzed. Simulation results illustrate that the proposed strategy achieves better handoff performance.
Because of nodes mobility, one of important and fundamental issues in mobile sensor networks is how to cluster the nodes in network. The clustering is a method for best managing nodes energies, data collecting and sending information to base station and increasing network lifetime. In a wireless mobile network, the created clusters change continually and the nodes move from one cluster to another,...
Handover in LTE is purely hard handover. The use of break-before-connect handovers reduces the complexity of the LTE network architecture. However, the hard handover may result in data being lost. A Handover algorithm is needed for making handover decision. This decision may vary over time, depending on user's mobility. Many handover algorithms have been proposed. In this work, we optimized three...
In the past few years wireless sensor networks have received a greater interest in application such as disaster management, border protection, combat field reconnaissance and security surveillance. Sensor nodes are expected to operate autonomously in unattended environments and potentially in large numbers. WSNs cannot be deployed manually in a hostile or harsh environment. Thus, WSNs can be formed...
Mobility protocols are originally proposed to support ongoing Internet connectivity of hosts or networks in motion. However, the requirement of seamless connectivity in mobile environment and use of route optimization between the communicating nodes have introduced several security vulnerabilities to mobility protocols. In this paper, we explain with illustrative examples major security threats on...
Numerous researches about Mobile IPv6 (MIPv6) have been proposed recently and the handover delay of the Mobile Nodes (MNs) among different networks is surely a worthy noticing issue. There are three major reasons for the MIPv6 handover delay: Movement Detection, Duplicate Address Detection (DAD), and Binding Update (BU), in, which DAD occupies most of the MIPv6 handover delay and influences real-time...
Recently, there has been focus on augmenting Delay/Disruption Tolerant Networks (DTNs) with easily deployable stationary relay nodes making an unconnected infrastructure to facilitate the data delivery by increasing forwarding opportunities. Relay nodes are capable of downloading, storing, and forwarding the data messages from/to the mobile nodes. Placing the relay nodes is an important issue in DTNs...
In the next generation heterogeneous wireless networks, a user with a multi-interface terminal may have network access from different service providers using various technologies. Vertical Handover (VHO) is the capability to switch on-going connections from one Radio Access Network (RAN) to another. This switching is based on the discovered accesses, QoS constraints, operator policies, user preferences...
Recently, instant messaging service has been widely used by many users. In instant messaging, mobile users need to notify their instant messaging server of activity information periodically, so that their status should be managed and displayed as active at instant messengers of their buddies. The periodic notification, however, prevents instant messenger from entering sleep mode, and thus, results...
The RBC (Radio Block Center) handover is an important part of European Train Control System level 2 which is a typical safety-critical hybrid system. In this paper, we build a formal model of RBC handover procedure using Differential Dynamic Logic, which is a first-order dynamic logic for specifying and verifying hybrid systems, and identify some constraints that are necessary for ensuring safety...
This paper proposes an extension of Proxy Mobile IPv6 (PMIPv6) with bicasting for multi-homing and mobility support. In the proposed scheme, the Local Mobility Anchor (LMA) extends its Binding Cache Entry (BCE) for support of multiple bindings, and a mobile node (MN) performs the binding update to LMA. To support the handover, the LMA begins the bicasting of data packets to the New-Mobile Access Gateway...
This paper is a survey of new and improved recent position based routing methods in Mobile Ad-hoc Networks. The referenced materials agree on the main challenge in creating energy efficient mobile ad-hoc networks. The quest is to realize a simple, yet efficient means of routing and managing the Mobile Ad-hoc Network communications with existing technology. Although many protocols have been proposed,...
The present and next generation mobile network will support terminal mobility, personal mobility and service provider portability, making global roaming seamless. In future we need to balance heavy load. This necessitates research into the design and performance of high throughput database technologies used in mobile systems to ensure that future systems will be able to carry efficiently the anticipated...
This document provides detail on the implementation of a location awareness system which gives the user's current location, sends this location using SMS (Short Message Service) plus sharing location with friends and family and view them on Google maps. Users can also take benefit of this application in emergency situations by using emergency feature of this application. To get the location coordinates,...
Tourism industry is expected to grow tremendously in Malaysia. Mobile technology such as smart phones can be use as a tourist recommender system. This paper proposed a collaborative awareness framework in order to design a usable mobile system. The collaborative awareness framework takes into account of tourist types, tourism activities, tourist experiences, visiting phases, mobile technology capabilities...
We propose new authentication protocols that support fast hand-off for real-time applications such as voice over IP and audio/video conferencing in wireless mesh networks (WMNs). A client and a mesh access point (MAP) mutually authenticate each other using one-hop communications. The central authentication server is not involved during the handover process. Fast authentication for roaming from one...
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