By Kian-Lee Tan
In our more and more cellular international the power to entry info on call for at any time and position can fulfill people's details wishes in addition to confer on them a aggressive virtue. The emergence of battery-operated, inexpensive and conveyable pcs comparable to palmtops and PDAs, coupled with the provision and exploitation of instant networks, have made attainable the capability for ubiquitous computing. during the instant networks, moveable equipments turns into an built-in a part of latest disbursed computing environments, and cellular clients may have entry to information kept at details servers situated on the static part of the community even whereas they're at the flow. routinely, details is retrieved following a request-response version. despite the fact that, this version is not any longer enough in a instant computing atmosphere. First, the instant channel is unreliable and the bandwidth is low in comparison to the stressed out counterpart. moment, the setting is largely uneven with plenty of cellular clients gaining access to a small variety of servers. 3rd, battery-operated transportable units can more often than not function just for a short while simply because of the fast battery lifespan. therefore, consumers are anticipated to be disconnected more often than not. to beat those boundaries, there was a proliferation of learn efforts on designing info supply mechanisms to aid instant computing extra successfully. facts Dissemination in instant Computing Environments specializes in such mechanisms. the aim is to supply an intensive and accomplished evaluation of fresh advances on energy-efficient info supply protocols, effective instant channel bandwidth usage, trustworthy broadcasting and cache invalidation recommendations for consumers with lengthy disconnection time. in addition to surveying present tools, this ebook additionally compares and evaluates many of the extra promising schemes.
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Extra info for Data Dissemination in Wireless Computing Environments
While all these works looked at flat programs, [111, 126] adapted schemes in [60, 61] for non-flat programs. Index schemes for unclustered indexes have been proposed in . , publication group and demand-driven group, the downlink bandwidth must be distributed between the two groups. Let the bandwidth assigned for the downlink channel, the publication group and the demand driven group be β, βp and βo respectively. Note that β = βp + βo. The downlink channel can be viewed as time slots, and objects are broadcast in slots such that for every [k · βp/β] slots allocated to broadcast objects in Page 15 the publication group, [k · βo/β] slots will be reserved for the demand-driven group, for some integer k.
The schemes in [5, 59] adopt such an allocation. Dynamic allocation. In this category, the bandwidth is assigned to the two groups based on some optimization criterion. In this way, the workload and access patterns can be factored into the decision. For example, if the workload is high, then more bandwidth can be allocated to the publication group. Different allocation techniques can be adopted. One approach is to allocate the bandwidth proportionally based on characteristics of accesses on the two groups.
4/376 subject : Mobile computing, Mobile communication systems. Page i DATA DISSEMINATION IN WIRELESS COMPUTING ENVIRONMENTS Page ii The Kluwer International Series on ADVANCES IN DATABASE SYSTEMS Series Editor Ahmed K. Elmagarmid Purdue University West Lafayette, IN 47907 Other books in the Series: MIDDLEWARE NETWORKS: Concept, Design and Deployment of Internet Infrastructure, Michah Lerner, George Vanecek, Nino Vidovic, Dad Vrsalovic; ISBN: 0-7923-7840-7 ADVANCED DATABASE INDEXING, Yannis Manolopoulos, Yannis Theodoridis, Vassilis J.