Download Access to Mobile Services by Xu Yang, Athman Bouguettaya PDF

By Xu Yang, Athman Bouguettaya

ISBN-10: 0387887547

ISBN-13: 9780387887548

ISBN-10: 0387887555

ISBN-13: 9780387887555

Access to cellular companies specializes in tools for gaining access to broadcast established M-services from a number of instant channels. This publication provides a unique infrastructure that offers a multi-channel broadcast framework for cellular clients to successfully detect and entry composite M-services. Multi-channel algorithms are proposed for successfully getting access to composite services.

Access to cellular providers presents an in-depth survey of instant facts entry and motivates the necessity to deal with cellular companies in a different way. A instant model of provider orientated structure (SOA) can also be covered.

Designed for researchers and practitioners who paintings within the common quarter of cellular providers, this publication is usually compatible for advanced-level scholars in laptop science.

Forewords through:
Michael P. Papazoglou, Tilburg college, The Netherlands
Fabio Casati, college of Trento, Italy

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Additional resources for Access to Mobile Services

Example text

The access time consists of three parts: initial wait, initial index probe, and broadcast wait. initial wait (Ft ): It is the time spent to reach the first complete bucket. Obviously we have: Dt Ft = 2 initial index probe (Pt ): This part is the time to reach the first index segment. It can be expressed as the average time to reach the next index segment, which is calculated as the sum of the average length of index segments and data segments. Given the number of replicated level is r, the number of replicated index (Nrp ) is: 1 + n + ...

The testbed simulates data access for traditional wireless environments. The testbed is event-driven. The broadcasting of each data item, generation of each user request and processing of the request are all considered to be separate events in this testbed. They are handled independently without interference with each other. We call the testbed adaptive because (1) it can be easily extended to implement new data access methods; (2) it is capable of simulating different application environments; (3) new evaluation criteria can be added.

Some access methods use varied bucket sizes. For example, signature indexing uses two types of buckets, data bucket and signature bucket. Their sizes are different. 3. There are many factors that may affect time measurement during simulation, such as CPU speed, network delay, CPU workload, etc. Mobile user requests are simulated through a random request generator. During each simulation round, there are 500 requests generated. At the end of the round, the result is checked against the confidence level and confidence accuracy.

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