D. Duchamp. Issues in wireless mobile computing. In Proceedings of the 3rd IEEE Workshop on Workstation Operating Systems, pages 2--10, Key Biscayne, Floride, USA, Apr. 1992.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....any modification to the application and with little overhead. To the best of our knowledge, previous implementations of adaptations of this nature have relied on modifying the application. 1 Introduction The need for application adaptation in mobile and wireless environments is well established [6, 11, 12, 19, 30, 31]. Many approaches to adaptation have been proposed before, and many taxonomies of adaptation are possible. We focus here on where the adaptation is implemented, and recognize system based [20, 25] and applicationbased adaptation [13, 14, 17, 32] as the opposite ends of the spectrum. As the names ....

DUCHAMP, D. Issues in wireless mobile computing. In Proceedings of Third Workshop on Workstation Operating Systems (Key Biscayne, Florida, Apr. 1992), pp. 1--7.

....server crashes, or for load balancing reasons. Almost all applications servers with enterprise Java beans support include this functionality, e.g. are BEA Weblogic[4] and Oracle Application Server[39] The denition for enterprise Java beans servers can be found at: 13] It is a widely accepted[12, 34, 17] that applications in a mobile environment benet from adapting to the changing environments. As stated earlier, the network of tomorrow is likely to be heterogeneous. A mobile device will have multiple network interfaces, and for popular services there will be several service providers for the ....

D. Duchamp. Issues in wireless mobile computing. In Proceedings of the Third Workshop on Workstation Operating Systems, pages 210, Key Biscayne, FL, USA, April 1992. 93

.... These inelude unpredictable variation in network quality, wide disparity in the availability of remote services, limitations on local resources imposed by weight and size constraints, concern for battery power consumption, and lowered trust and robustness resulting from exposure and motion [5 15, 31]. Once the need for adaptation is recognized, many questions follow. What form should such adaptation take Which system components should bear responsibility for adaptation How does one characterize the adaptive capability of a mobile client How does one compare alternative designs from the ....

D. Duchamp. Issues in Wireless Mobile Computing. In Proceedings of the Third lEEE Workshop on Workstation Operating Systems, Key Biscayne, FL, April 1992.

....use by portable computers. And, unfortunately, battery technology has been improving at only a modest pace in terms of increased capacity per unit weight and volume. The highest capacity battery technology currently used in portables is lithium ion, providing as much as 380 W h L and 135 W h kg [10]. This is an improvement over the roughly 260 330 W h L and 120 W h kg achievable from them in 1995 and the roughly 180 W h L achievable from them in 1991. Most impressive, though, is their improvement over earlier battery technologies, such as nickel metal hydride with its 150 W h L and 50 ....

D. Duchamp, "Issues in wireless mobile computing," Proc. Third IEEE Workshop on Workstation Operating Sys., Key Biscayne, FL, Apr. 1992, pp. 2--10.

....o er the agility of the former in four of ve scenarios and the stability of the latter in three of four scenarios. Keywords mobile netw ork estimation, ltering, adaptive systems 1. INTRODUCTION It is widely recognized that adaptation to changing networking conditions is critical to mobility [8, 13]. Ho wever, to adapt to netw ork conditions one must rst know what they are and how they change over time. Speci cally, a mobile node must knowthe######### ####### ######## that it could potentially utilize. This is a dicult problem, since the e ective latency and bandwidth betw een a mobile ....

D. Duchamp. Issues in wireless mobile computing. In ########### ## ### ##### ######## ## ########### ######### #######, pages 2-10, Key Biscayne, FL, USA, April 1992.

....the movement between different administrative domains. These problems are also present in todays distributed systems, but in mobile computing they are central problems as opposed to unlikely occurrences or error conditions. For a more thorough description of the issues of mobile computing, see [Duc92] MDC93] and [IB94] CHAPTER 1. INTRODUCTION 3 1.2.1.1 Host Migration The fact that a mobile host may actually migrate from one network to another, complicates the network related matters of locating a specific host and determining the optimal route of a packet to a specific host. There ....

Daniel Duchamp. Issues in Wireless Mobile Computing. In Proceedings of the Third Workshop on Workstation Operating Systems, pages 1--7. IEEE, April 1992.

....data at the resolution at which a user requests it and save the client time, sending first a very coarse version for browsing, and subsequently sending more details when the user zooms in. 1. 1 Adaptation The need for application adaptation in mobile and wireless environments is well established [4, 16, 20, 27, 43, 44]. Many approaches to adaptation have been proposed before, and many taxonomies of adaptation are possible. We focus here on the types of adaptation policies as well as the location of the implemented adaptation. Adaptation policies can be grouped into two types: data and control [14] Data ....

D. Duchamp, "Issues in wireless mobile computing," Proceedings of Third Workshop on Workstation Operating Systems, Key Biscayne, Florida, 1992, pp. 1-7.

....offer the agility of the former in four of five scenarios and the stability of the latter in three of four scenarios. Keywords mobile network estimation, filtering, adaptive systems 1 Introduction It is widely recognized that adaptation to changing networking conditions is critical to mobility [8, 13]. However, to adapt to network conditions one must first know what they are and how they change over time. Specifically, a mobile node must know the available network capacity that it could potentially utilize. This is a difficult problem, since the effective latency and bandwidth between a ....

D. Duchamp. Issues in wireless mobile computing. In Proceedings of the Third Workshop on Workstation Operating Systems, pages 2--10, Key Biscayne, FL, USA, April 1992.

....that Puppeteer can achieve average reductions in user latency of up to 84.22 for PowerPoint documents loaded over a 384 Kb sec link and 76.42 for HTML documents loaded over 56 Kb sec link. 1 Introduction The need for application adaptation in mobile and wireless environment is well established [3, 10, 11, 18, 30, 29]. Users want to use the same tools in a mobile environment as they do in their well connected office. Users want to access the same files, even in cases where the files are quite large and the bandwidth is limited, leading to long latencies for file upload and download. Many approaches to ....

DUCHAMP, D. Issues in wireless mobile computing. In Proceedings of Third Workshop on Workstation Operating Systems (Key Biscayne, Florida, Apr. 1992), pp. 1--7.

....work and conclude the paper in Section 7. 2 Previous Work The benefit of adaptation in protocols is clear, for example in the TCP IP protocol s adaptation to increases and decreases in bottleneck bandwidth[11] More aggressive forms of protocol adaptation have been attempted in the wireless domain[14, 4, 12] because the complexity and variation of link behavior is high. In [14] adaptation is performed on the basis of application characteristics. The work reported in [6] showed that link layer adaptation can significantly improve performance. Adaptation in the structure of protocols was achieved ....

D. Duchamp. Issues in Wireless Mobile Computing. In Proceedings of the 3rd Workshop on Workstation Operating Systems, pages 2--10, April 1992.

....is important that such standards and technologies remain responsive to new developments in computer and communications technologies. This paper reports on experiences of applying ODP standards, and more specifically the ANSAware distributed systems platform, in the new area of mobile computing [Duchamp92, Katz94]. The paper is structured as follows. Section 2 summarises the main body of research carried out in the MOST Project (Mobile Open Systems Technology for the Utilities Industries) at Lancaster, which has looked at the potential of RM ODP technology and wireless communications to support mobile ....

Duchamp, D., "Issues in Wireless Mobile Computing", Proceedings 3rd Workshop on Workstation Operating Systems, Key Biscayne, Florida, U.S., pp. 2-10, 1992.

....Serializability is a widely accepted correctness criterion for executions of transactions [8] This correctness criterion is also adopted in this paper. In order to reduce the contention on the narrow bandwidth of the wireless channel, usually part of a database is cached in mobile computers [7, 2, 3]. Some caching strategies for mobile computers have been introduced in [3] The performance of these strategies and the impact of client s disconnection times on these strategies are evaluated. In [11] various static and dynamic data allocation (caching) methods are proposed to optimize the ....

D. Duchamp. Issues in Wireless Mobile Computing. In Proceedings. Third Workshop on Workstation Operating Systems, pages 2--10, 1992.

....apposite direction receives redundant information proportional to . As a consequence, in wireless multimedia applications [22] mobile subscribers could experience severe jitter as they traverse cell boundaries during a multimedia broadcast session. In mobile distributed computing applications [8, 9, 10, 12], this situation could result in loss of critical data. This problem could pose particularly severe difficulties in micro cellular [21] systems and wireless local area networks [11] where cell transitions occur frequently. In Section 2, we present a more illustrative example of this phenomena. To ....

D. Duchamp, "Issues in wireless mobile computing," Third Workshop on Workstation Operating Systems, pp. 2 -- 10, (1992).

....communications quality ofservice. 1: Introduction Future computer environments will include mobile computers which will either be disconnected, weakly interconnected by low speed wireless networks such as GSM, or fully inter connected by high speed networks ranging from Ethernet to ATM ([1, 2]) Two key characteristics of such environments are: i) a heterogeneous processing environment (including relatively low power mobile hosts) and, ii) rapid and massive fluctuations in the quality of service (QoS) provided by the underlying communications infrastructure. The first of these ....

Duchamp, D. "Issues in Wireless Mobile Computing." Proc. Third Workshop on Workstation Operating Systems, Key Biscayne, Florida, U.S., 1992. IEEE Computer Society Press, Pages 2-10.

....heterogeneity of the network, security, address migration mobile routing, location dependent information, low power design, restricted disk and memory and user interfaces. They attempt to show the kind of constraints that these factors put on the software system for mobile computers. Duchamp in [39] also provides a similar overview. He deals with the challenges that mobile computing poses to internetworking and service providing, amongst others, and lists the research issues that need to be addressed. Another review is provided by Caldwell[27] His focus, however, is on how such systems ....

D. Duchamp, Issues in Wireless Mobile Computing, Proceedings 4th IEEE Workshop on Workstation Operating Systems, IEEE Comput. Soc. Press, October 1993, pp. 2--10.

....virtualizes the computing environment or working session to make it independent of locations. We call this method computing environment migration. It is difficult to migrate a computing environment dynamically from one system to another. Many ideas and issues have recently been proposed [Wei91, DM92, Duc92]. The structures and mechanisms of existing operating systems need to be modified to support the functionality of computing environment migration. File systems may need aggressive caching strategies and support for disconnect operations [HHRB92, KS92] Network connections may require transparent ....

....environment migration. File systems may need aggressive caching strategies and support for disconnect operations [HHRB92, KS92] Network connections may require transparent protocols [TYT91, IDM91, CPR92] for mobile computers. Window systems are also required to support transparent migrations [Wei91, Duc92]. This paper proposes a process capturing mechanism to support computing environment migration. The mechanism is a simple extension to the existing Unix process management. We have implemented a process capturing mechanism in Ultrix 4.3 operating system and a capture shell. The shell can migrate ....

D. Duchamp. Issues in Wireless Mobile Computing. In The Third Workshop on Workstation Operating Systems, 1992.

....issue would not have been very important. However, on current mobile computing devices, which have limited communications capability, the resolution of this issue is the characteristic that differentiates models. Two commonly cited models, the terminal and workstation models, as described by [4], represent the two extremes of partitioning. The terminal model of mobile computing views mobile machines as input devices, which relay all data to a remote server (i.e. on the other end of the communication channel) No data manipulation is done on the mobile unit itself. The workstation model, ....

D. Duchamp, "Issues in Wireless Mobile Computing," in Proceedings of the Third Workshop on Workstation Operating Systems, (Key Biscayne, FL), IEEE, April 1992.

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D. Duchamp. Issues in wireless mobile computing. In Proceedings of the 3rd IEEE Workshop on Workstation Operating Systems, pages 2--10, Key Biscayne, Floride, USA, Apr. 1992.

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Duchamp, D. Issues in wireless mobile computing. Proceedings of the IEEE Workshop on Workstation Operating Systems, 2--10, April 1992.

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D. Duchamp. Issues in wireless mobile computing. In Proceedings of 3rd IEEE Workshop on Workstation Operating Systems, 1992.

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D. Duchamp, \Issues in wireless mobile computing," in Proceedings of Third Workshop on Workstation Operating Systems, pp. 1-7, (Key Biscayne, Florida), Apr. 1992.

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D. Duchamp. Issues in wireless mobile computing. In Proceedings of the 3rd IEEE Workshop on Workstation Operating Systems, pages 2--10, Key Biscayne, Floride, USA, Apr. 1992.

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D. Duchamp. Issues in wireless mobile computing. In Proceedings of the 3rd IEEE Workshop on Workstation Operating Systems, pages 2--10, Key Biscayne, Floride, USA, Apr. 1992.

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Duchamp, D., "Issues in Wireless Mobile Computing", Proc. Third Workshop on Workstation Operating Systems, Key Biscayne, Florida, U.S.A., pp 2-10, 1992.

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Duchamp, D. Issues in wireless mobile computing. Proceedings of the Third IEEE Workshopon WorkstationOperating Systems, Key Biscayne, FL, 2--10, April 1992.

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