By Kian-Lee Tan
In our more and more cellular international the power to entry details 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 desktops resembling palmtops and PDAs, coupled with the provision and exploitation of instant networks, have made attainable the aptitude for ubiquitous computing. throughout the instant networks, moveable equipments becomes an built-in a part of present dispensed computing environments, and cellular clients could have entry to information saved at details servers positioned on the static element of the community even whereas they're at the stream. usually, details is retrieved following a request-response version. even if, this version is not any longer enough in a instant computing setting. First, the instant channel is unreliable and the bandwidth is low in comparison to the stressed counterpart. moment, the atmosphere is largely uneven with a good number of cellular clients getting access to a small variety of servers. 3rd, battery-operated transportable units can mostly function just for a short while simply because of the fast battery lifespan. hence, consumers are anticipated to be disconnected as a rule. to beat those obstacles, there was a proliferation of examine efforts on designing info supply mechanisms to help instant computing extra successfully. facts Dissemination in instant Computing Environments specializes in such mechanisms. the aim is to supply an intensive and accomplished evaluate of fresh advances on energy-efficient info supply protocols, effective instant channel bandwidth usage, trustworthy broadcasting and cache invalidation thoughts for consumers with lengthy disconnection time. in addition to surveying present equipment, this ebook additionally compares and evaluates many of the extra promising schemes.
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Additional info for Data Dissemination in Wireless Computing Environments
This is unnecessary especially if the data bucket containing the target objects are uncorrupted. We shall present new data organization techniques that allow the clients to tune to the data quickly (and hence avoid excessively long access time) in the presence of errors in the access path. In Chapter 6, we focus on cache invalidation schemes for mobile clients who cache frequently accessed data. While caching can reduce the channel contention, the frequent disconnection and mobility of clients complicate the process of maintaining cache consistency: a client who reconnects is no longer certain whether its cache is still valid or not.
All the data objects are placed in the demanddriven group, and objects are only broadcast in response to explicit requests. Examples of this approach can be found in [15, 26, 123, 109]. Hybrid. In a hybrid approach, some objects are allocated for publication, while the remaining objects are to be requested before they are delivered. [5, 27, 34, 101] are examples of works that have employed this technique. As we shall see shortly, both the publication-only and demand-driven-only approaches are special cases of the hybrid approach.
Cyclic programs may also be flat or non-flat. In flat programs, all objects are of equal importance and disseminated once in a broadcast cycle. On the contrary, a non-flat program favors objects with higher access frequencies. Hence, in a broadcast cycle of a non-flat broadcast, while all objects are broadcast, some will appear more often than others. Acyclic programs are typically non-flat in nature. For simplicity, we shall refer to acyclic programs as randomized (or repetitive) programs. For cyclic programs, because a data object appears repeatedly in the broadcast, a client that misses the object may be able to get it in the same cycle (for Page 14 non-flat programs) or at most in the next cycle.