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Personal Communications, IEEE

Issue 5 • Date Oct. 1997

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Displaying Results 1 - 8 of 8
  • Mobility and Location

    Page(s): 7
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  • A new location technique for the active office

    Page(s): 42 - 47
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    Configuration of the computing and communications systems found at home and in the workplace is a complex task that currently requires the attention of the user. Researchers have begun to examine computers that would autonomously change their functionality based on observations of who or what was around them. By determining their context, using input from sensor systems distributed throughout the environment, computing devices could personalize themselves to their current user, adapt their behaviour according to their location, or react to their surroundings. The authors present a novel sensor system, suitable for large-scale deployment in indoor environments, which allows the locations of people and equipment to be accurately determined. We also describe some of the context-aware applications that might make use of this fine-grained location information View full abstract»

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  • Piconet: embedded mobile networking

    Page(s): 8 - 15
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    Piconet is a general-purpose, low-power ad hoc radio network. It provides a base level of connectivity to even the simplest of sensing and computing objects. It is our intention that a full range of portable and embedded devices may make use of this connectivity. This article outlines the Piconet system, under development at the Olivetti and Oracle Research Laboratory (ORL). The authors discuss the motivation for providing this low-level “embedded networking”, and describe their experiences of building such a system. The article concludes with a commentary on some of the implications that power saving, and other considerations central to Piconet, have on the design of the system View full abstract»

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  • Mobilizing applications

    Page(s): 26 - 34
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    Wireless communication links are expensive and slow, and are therefore a scarce resource. Their usage should be subject to special scrutiny, especially when used by general-purpose application programs. We present the services of the “Mobile Application Framework” which supports conventional applications while using these links in three aspects: first, by optimizing outgoing communication calls via call interception and the spoofing of replies; second, by allowing disconnected operation through file logging and automatic modification reconciliation; and third, by scheduling and communication calls to allow the user to specify a monetary communications budget. As an example application, we show how the system can be used to mobilize a conventional e-mail system. Similar functionality to that provided by dedicated mobile e-mail clients and the ability to adapt to changing network environments is achieved without requiring any changes to the e-mail system itself or its user interface View full abstract»

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  • The ORL active floor [sensor system]

    Page(s): 35 - 41
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    A novel type of sensor system called the active floor is presented that allows the time-varying spatial weight distribution of the active office environment to be captured. The properties of the active floor are described, showing that it differs substantially from other commonly encountered sensor systems. Furthermore, classification of the footstep signature of a number of individuals is attempted by application of the hidden Markov model technique View full abstract»

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  • Location-oriented multimedia

    Page(s): 48 - 57
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    Location-oriented multimedia describes the integration of location-awareness technology and mobile multimedia applications. Application mobility is targeted at users rather than hosts. Since much complex execution and user interface state is set up in the course of application sessions, it is useful to be able to retain this transparently after moving an application. Distributed multimedia complicates this problem since many users can be involved, each with distributed media sources and sinks connected to one another. These communication channels must be reestablished after movement. The authors first present a flexible framework, the components of which provide the building blocks for a wide range of location-oriented application support architectures. The issues of location awareness, use of mobile agents, mobile multimedia endpoints, mobile object location, and communication systems are addressed. Second, the authors present a specific architecture that integrates these components to support location-oriented multimedia. In this architecture, mobile agents are used as controllers of multimedia sessions. The mobile agent system has been made location-aware so that applications can move to user locations and even follow users. Mobile multimedia endpoints support the reestablishment of distributed multimedia streams after movement View full abstract»

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  • Local and global handovers for mobility management in wireless ATM networks

    Page(s): 16 - 24
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    This article deals with the problem of virtual circuit (VC) management in wireless ATM (W-ATM) networks with mobile user terminals. In W-ATM networks, a VC terminating at a mobile user may require dynamic reestablishment during the short time span necessary for terminal handover due to its movement from one (macro)cell to another. The VC reestablishment procedure has to ensure in-sequence and loss-free delivery of the ATM cells containing user data. After a classification of the solutions proposed so far in the literature, a novel technique for the dynamic reestablishment of VCs in W-ATM networks is described, and its performance is evaluated through simulation. The proposed technique allows for a progressive upgrade of the fixed part of the ATM network and for the incremental introduction of user terminal mobility View full abstract»

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  • Context-aware applications: from the laboratory to the marketplace

    Page(s): 58 - 64
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    Current hardware developments are making mobile computing increasingly attractive. An important class of mobile applications are context-aware applications: applications that change their behaviour according to the user's present context-their location, who they are with, what the time of day is, and so on. This article is about software design for context-aware applications. Currently most such applications have been crafted by experts in research laboratories. Our aim is to factor out a simple class of context-aware applications and make the creation of these as easy as, say, creating Web pages View full abstract»

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Aims & Scope

This Magazine ceased publication in 2001. The current retitled publication is IEEE Wireless Communications.

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