M. Haahr, R. Cunningham, and V. Cahill. Supporting CORBA applications in a mobile environment. In Proceedings of the 5th annual ACM/IEEE International Conference on Mobile Computing and Networking, pages 36--47. ACM Press, New York, 1999.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....terms of software size and protocol suitability, as already mentioned. IIOP (i.e. the Internet Inter ORB Protocol) is the essential part of CORBA that is needed to allow communication among devices. IIOP has been successfully ported to mobile setting and used as a minimal ORB for mobile devices [27]. IIOP defines the minimum protocol necessary to transfer invocations between ORBs. In ALICE [27] hand helds with Windows CE and GSM adaptors have been used to provide support for client server architectures in nomadic environments. An adaptation of IIOP specifically for mobile (i.e. LW IOP, ....

....Inter ORB Protocol) is the essential part of CORBA that is needed to allow communication among devices. IIOP has been successfully ported to mobile setting and used as a minimal ORB for mobile devices [27] IIOP defines the minimum protocol necessary to transfer invocations between ORBs. In ALICE [27] hand helds with Windows CE and GSM adaptors have been used to provide support for client server architectures in nomadic environments. An adaptation of IIOP specifically for mobile (i.e. LW IOP, Light weight Inter Orb Protocol) has been devised in the DOLMEN project [57] caching of unsent data ....

M. Haahr, R. Cunningham, and V. Cahill. Supporting CORBA Applications in a Mobile Environment (ALICE). In 5th Int. Conf. on Mobile Computing and Networking (MobiCom). ACM Press, August 1999.

....Domain Task Force, PalmORB and Project ENNCE. The remainder of this section provides an overview of each of these. The ALICE project The ALICE (Architecture for Location Independent CORBA Environments) project is being researched at Trinity College Dublin with support from IONA Technologies [Haahr,99] The aim of the project is to develop a variant of CORBA that offers effective support for host mobility using an approach based on mobility gateways. These gateways exist at the interface between the wired and wireless networks and fulfil several roles, including acting as a proxy for the ....

M. Haahr, R. Cunningham and V. Cahill, "Supporting CORBA Applications in a Mobile Environment", Proceedings of the 5th ACM International Conference on Mobile Computing and Networking (MobiCom '99), Seattle, Washington, U.S., 15th-19th August 1999.

....on mobile devices to interact transparently with objects defined within other ORB implementations. ALICE allows server as well as client objects to reside on mobile hosts and provides a mechanism to support the movement of the servers without the requirement of a centralised location register [Haahr 99] 37 The components that make up the communications architecture in ALICE are shown in the following diagram: Figure 2 8 Client Server Communication in a Wireless Network The Mobility Gateway (MG) acts as a bridge between the wireless network and the fixed network. It takes on a similar role ....

Mads Haahr, Raymond Cunningham and Vinny Cahill. Supporting CORBA Applications in a Mobile Environment, Mobicom August 1999

....information from as many sources as possible. These sources include low level information about the changing nature of the execution environment, but also include high level knowledge and intelligence from the application being adapted and the user using the application. Traditional systems [2, 14, 15, 21, 22, 31 33] have failed to take into account the intelligence of the user and the application to drive dynamic adaptation, as the execution environment, the application resources and demands, the users resources and requirements all change, possibly in an unpredictable and erratic manner. It is ....

....the design of the Chisel framework and how adaptations are driven by a declarative policy rule script, which also describes high level contextual information influencing how the framework should adapt base level service objects. Section 4 describes an adaptive middleware system based on ALICE [2, 14, 15, 32] to demonstrate the Chisel adaptation framework. Section 5 describes related research, with conclusions and planned future work described in Section 6. 2. Using reflection to dynamically inspect and adapt software systems This section describes the use of reflection as a dynamic adaptation ....

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M. Haahr, R. Cunningham, and V. Cahill. "Supporting CORBA Applications in a Mobile Environment." in MobiCom '99: 5th International Conference on Mobile Computing and Networking. Seattle. 1999

....programming model is an anonymous event based communication model, which we discuss later. Using a non blocking event based model, we are able to achieve autonomous sentient behaviour that is independent of the problems associated with traditional blocking communication paradigms (such as RPC [3,15,20,25]) The programming model includes mechanisms for the specification of constraints on the propagation and delivery of events, and the means to express incremental real time and reliability guarantees, in the form of QoS properties. QoS is taken as a metric of predictability in terms of timeliness ....

Mads Haahr, Raymond Cunningham and Vinny Cahill. Supporting CORBA Applications in a Mobile Environment, in Proceedings of the 5 th ACM/IEEE International Conference on Mobile Computing and Networking (MobiCom), 1999.

....Developers use the ALICE framework by writing a series of software modules to interface with a set of core ALICE modules. This paper describes the overall architecture and the core modules independently of any particular application level protocol. A. Mobility Challenges Our previous work [5] identified three areas where operation in mobile environments poses a challenge compared to traditional (wired, fixed) environments: Device Limitations of the mobile host itself in the form of limited processing power, battery life, memory restrictions, etc. These limitations require software ....

....in order. 4. It must be possible to store some extra information in a server reference. 5. Forwarding of client requests towards a different server location must be possible. An example of such a protocol is the CORBA Internet Inter Orb Protocol (IIOP) with which the first version of AL ICE [5] was tested. Work is currently ongoing on supporting Java RMI and DCOM in a similar fashion. C. Mobility Model The model for communications used in the ALICE framework is that mobile hosts connect to remote hosts via mediators, or base stations, called mobility gateways, as shown in LEGEND: ....

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Mads Haahr, Raymond Cunningham, and Vinny Cahill. Supporting corba applications in a mobile environment. In Proceedings of the 5th International Conference on Mobile Computing and Networking (MobiCom '99), pages 36--47. ACM, August 1999.

....RMI client or server objects to reside on a mobile host which changes its point of connection to the Internet and which uses an unreliable wireless transport connection to interact with other RMI objects. This design is based on the Architecture for Location Independent CORBA Environments (ALICE) [4]. ALICE addresses similar mobility concerns in the Common Object Request Broker Architecture (CORBA) 5] ALICE provides support for CORBA objects on mobile hosts to interact transparently with other CORBA objects without the need for a centralised location register to monitor the location of the ....

....virtual connection and the request identifier, which is used to identify the acknowledgement of a packet. To increase efficiency, the ML will delay opening a connection for a socket until there is actual data to be sent or received for it. The ML provides four main services to the layers above it [4] . It hides broken connections by transparently restoring links when they are lost. It allows TCP ports on the MG to be allocated by the IIOP Layer to accept incoming connections. Remote Host Application S IIOP Mobility Layer TCP IP IIOP Application S IIOP IIOP Mobility Layer ....

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Mads Haahr, Raymond Cunningham and Vinny Cahill. Supporting CORBA Applications in a Mobile Environment. In Proc. of MobiCom99, Seattle, WA, pages 36--47. ACM, August 1999.

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M. Haahr, R. Cunningham, and V. Cahill. Supporting CORBA applications in a mobile environment. In Proceedings of the 5th annual ACM/IEEE International Conference on Mobile Computing and Networking, pages 36--47. ACM Press, New York, 1999.

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M. Haahr, R. Cunningham, and V. Cahill, "Supporting CORBA applications in a mobile environment," in Proceedings of the Fifth ACM/IEEE International Conference on Mobile Computing and Networking, 1999.

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M. Haahr, R. Cunningham, and V. Cahill. "Supporting CORBA Applications in a Mobile Environment," In Proceedings of the 5th International Conference on Mobile Computing and Networking (MobiCom 99), August 1999.

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M. Haahr, R. Cunningham, and V. Cahill. Supporting CORBA Applications in a Mobile Environment (ALICE). In 5th Int. Conf. on Mobile Computing and Networking (MobiCom) , pages 36--47. ACM Press, August 1999.

No context found.

M. Haahr, R. Cunningham, and V. Cahill. Supporting CORBA applications in a mobile environment. In Proceedings of the 5th annual ACM/IEEE International Conference on Mobile Computing and Networking, pages 36--47. ACM Press, New York, 1999.

No context found.

M. Haahr, R. Cunningham, and V. Cahill. Supporting CORBA Applications in a Mobile Environment (ALICE). In 5th Int. Conf. on Mobile Computing and Networking (MobiCom) , pages 36--47. ACM Press, August 1999.

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