On the retrial and redial phenomena in GSM networks

Onur, Ertan
Ersoy, C
Caglayan, MU
GSM operators work with call data that include retrials and redials as well. Based on these inflated, virtual call attempt statistics, it appears that enormous demands are put on the available spectrum. In this paper, we develop simple models to estimate the expected number of retrials and redials per original call attempt, which is used to determine the effective load and the number of traffic channels required to meet the grade of service. It is shown that significantly fewer channels are capable of handling high traffic loads.


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Our work shows that the query latency for selective search over a topically partitioned collection can be reduced by up to 55%. We achieve this by physically storing the documents in each topical cluster across all shards and building a cluster-skipping index at each shard. Our approach also achieves uniform load balance among the shards.
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Recently XML has established itself as the standard for representing data in scientific and business applications. Starting out as a standard data exchange format over the web, it has become instrumental in all kinds of applications. Almost all standardization efforts on the web today are based on XML. As a consequence, the amount of XML data being stored and processed is large and will be increasing at a very rapid rate. This has caused XML data management to become a focus of research efforts in the datab...
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In pattern recognition, when data has different structures in different parts of the input space, fitting one global model can be slow and inaccurate. Learning methods can quickly learn the structure of the data in local regions, consequently, offering faster and more accurate model fitting. Breaking training data set into smaller subsets may lead to curse of dimensionality problem, as a training sample subset may not be enough for estimating the required set of parameters for the submodels. Increasing the ...
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Citation Formats
E. Onur, C. Ersoy, and M. Caglayan, “On the retrial and redial phenomena in GSM networks,” 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55009.