CS2402 MOBILE AND PERVASIVE COMPUTING NOTES PDF

This can reduce the number of packets down to only two instead of seven. It is independent of transport protocol. Discuss the problems of a file system in mobile environment. How biometric signals are used in pervasive computing? The MAC algorithm with backoff solves this problem. An identifier is assigned uniquely to one mobile entity.

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Answers ALL Questions. Which are the new compoents added to GPRS network? User of the GSM systems work with telephone numbers. That is all users should see. These phone numbers are completely independent of the current location of the users. The system itself needs some additional information ;however,it must not reveal the identify of users.

During operation with in a location area,only a temporary identifier ,the TMSI is needed. This hides the identity of a user. But instead another temporary numbers reflects the location and any roaming required is the MSRN is used internally by the system. In what situations can collission occur in IEEE For The MAC algorithm with back-off solves this problem. In Import packets in What is adaptive modulation? It is a term used in wireless communication to denote the matching of the modulation, coding and other signal and protocol parameters to the conditions on the radio link e.

Especially over fading channels which model wireless propagation environments, adaptive modulation systems exhibit great performance enhancements compared to systems that do not exploit channel knowledge at the transmitters.

What is reverse tunneling? It is a mechanism of taking a packet out of the data part of another packet. What are the problems of proactive routing? Name the advantages and disadvantages of user acknowledgement in WTP? Classical transactional services typically benefit from user acknowledgements,for most push service user acknowledgements are not necessay, still WTP acknowledgements can improve reliability. How I-TCP isolate the problems on the wireless link?

However, this also requires that intermediate systems are able to look into IP packets to split the connection.

What is meant by pervasive computing? How is it done? Pervasive computing devices are completely connected and constantly available. Pervasive computing relies on the convergence of wireless technollogies,advanced electronics and the Internet. What makes device connectivity possible in pervasive computing? Pervasive devices cannot be used in standalone mode.

They have to be connected to the services and applications through internet. Assume What are the optimization possible? With a state chart explain the operation of DHCP? How can this language help saving bandwith and delay? How is unnecessary overhead avoided when using WSP on top of this class of web browsing?

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