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In: Computers and Technology

Submitted By omar50
Words 3176
Pages 13
Wireless Wide Area Networks: Trends and Issues

Wireless Wide Area Networks: Trends and Issues
Mobile computing devices are getting smaller and more powerful, while the amount of information is growing astronomically. As the demand for connecting these devices to content-rich networks rises, WWAN technology seems like the perfect answer. But today's wireless WANs have some limitations. This white paper discusses those limitations and how NetMotion™ overcomes them. · Specialized equipment and custom applications were needed for deployment over these proprietary wireless systems. · Often the wireless infrastructures themselves were difficult to deploy. · Only a small percentage of the working population was mobile, so corporations considered wireless data deployment a significant investment with little return. Why the resurgence of interest in wireless data networking technologies now? In the late twentieth century, a few interesting social and technological developments took place. In the late 1990's, businesses began seeing the economic benefit of having employees who work away from their campuses. These remote (and sometimes nomadic) workers needed access to everyday corporate information to do their jobs. Providing workers with remote connectivity became a growing challenge for the information staff. Handheld and pocket-sized computers became powerful enough to be useful. The convergence of Internet networking technologies made IP the de facto standard. New standards such as General Packet Radio Services (GPRS) were being adopted to provide wireless network services. With the development of such technology, the promise of faster access speeds from new wide area wireless interconnects began to approach (or in some cases exceed) standard connections over landlines. These factors created the environment for the anytime, anywhere connected worker.


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...two syllable constraints that are specific to syllables, Onset (violated by any syllable not containing a filled onset) and NoCoda (violated by any segment in a coda) (see, e.g., [Fery & van de Vijver, 2003]); these can be usefully compared with Pulgram’s Rules of maximum open syllabicity, and of minimal coda, as discussed above. One could imagine a different set of constraints, couched within an optimality theoretic framework, that would account for syllabification, but most work to date has assumed some version of these constraints, or constraint families. If faithfulness constraints (Dep, Max) are ranked lower than the syllable constraints, then a language will use either epenthesis or deletion to ensure that surface forms are of the form CVCVCV. If Onset is ranked higher than the faithfulness constraints, which are in turn ranked higher than NoCoda, then some strategy, such as consonant epenthesis, will emerge to provide a consonant to precede any vowel that is not preceded by a consonant. If the faithfulness constraints outrank the syllable constraints, then codas, coda clusters, and onset clusters may emerge, if the lexicon and the morphology provide such circumstances.[Fery & van de Vijver, 2003]. Such an account uses cover terms such as NoCoda, which can be viewed either as promissory notes, or better, as implicit hooks into whatever theory of phonological representation one chooses to use, provided it permits access to coda-labeling as such.12 1.15 Must we choose......

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