Mobile Communications: Technology, tools, applications, by H. Sasaki (auth.), José L. Encarnação, Jan M. Rabaey (eds.)

By H. Sasaki (auth.), José L. Encarnação, Jan M. Rabaey (eds.)

Mobile computing is likely one of the largest problems with computing device expertise, technological know-how and this day. This e-book seems on the standards of constructing cellular computing structures and the demanding situations they pose to machine designers. It examines the necessities of cellular computing undefined, infrastructure and communications providers. details safeguard and the information safeguard elements of layout are thought of, including telecommunications amenities for linking as much as the global desktop infrastructure. The publication additionally considers the mobility of desktop clients as opposed to the portability of the apparatus. The textual content additionally examines present purposes of cellular computing within the public quarter and destiny leading edge applications.

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Additional info for Mobile Communications: Technology, tools, applications, authentication and security IFIP World Conference on Mobile Communications 2 – 6 September 1996, Canberra, Australia

Example text

We believe that in a typical mobile environment, it is best to employ a hybrid broadcast and on-demand communication paradigms so that the hot items will be broadcast while the cold items will be disseminated on-demand. The size of the air-storage will thus depend on the relative ratio of the response time between on-demand and broadcast queries. For instance, if the average response time for an ondemand query is t, the response time for queries against broadcast database should not exceed t or clients might as well access the data on demand.

While caching is performed on an entity basis, the spatial locality information among the different cached items in database applications is lost. This is amplified by the time lag until the server is aware of the access patterns on database items issued by the clients. This in turn implies that conventional replacement strategies that perform good (such as least recently used or LRU) (Korth and Silberschatz, 1991) are no longer suitable in the new context since they are based on the principle of locality.

If the air-storage is not exhausted, an entity is cached if its cumulative access frequency is higher than a certain threshold T. However, if the air-storage is exhausted, an entity is cached only if its accumulated access frequency is higher than the lowest access frequency of a cached entity. In other words, with an air-storage of size c, only those c items with the highest access frequencies are broadcast. Alternatively, a window for the access frequencies spanning several broadcast cycles could be maintained for each entity.

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