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Mobile Database Systems

Vijay Kumar

Chapter 9

Wireless Information Broadcast - all with Video Answers

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Chapter Questions

Problem 1

Investigate how data flows through a wireless channel. If a data stream is continuously dispatched on the same channel, then the channel can be thought of as a storage media for the data stream. Thus the broadcast server could continuously send all its data on a set of channels and eliminate the disk altogether. Is this storage model acceptable to you? If not, then what problems do you see in this model?

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Problem 2

Investigate additional properties of push and pull approaches. Develop a set of criteria, which will help us to select when to use push and when to use pull for efficiently manage data on wireless and mobile systems.

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Problem 3

Investigate limitation of the broadcast disk approach of storing data.

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Problem 4

Why indexing is required for accessing broadcast. Suppose the server dispatches weather information of a dedicated channel. A user just tunes this channel and downloads the weather information. This seems to be easy, then why do we need index for data download from a broadcast?

Kaylee Mcclellan
Kaylee Mcclellan
Numerade Educator

Problem 5

How the use of major and minor index improves the data access from a broadcast?' Do you think that creating more levels of indexing would further improve data access? Explain your answer and give an example to support your answer.

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