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Pune University - Sem - III : Mobile Computing, April 2010

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Total No. of Questions :5] [Total No. of Pages : 2 P1065 [3733]-302 M.Sc. COMPUTER SCIENCE CS -302 : Mobile Computing (Sem. - III) (Old & New) Time :3Hours] [Max. Marks : 80 Instructions to the candidates: 1) All questions are compulsory. 2) All questions carry equal marks. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. Q1) Attempt ALL of the following : [16] a) What is profile? Name different types of profiles. b) Define record store. Why record enumeration is needed? c) Which Network protocols does J2ME supports for establishing connection? d) Define : Cluster and MIDlet. e) What is gossip protocol? f) What is variable timing advance in GSM? g) List different command types in J2ME h) What is the purpose to AUC in GSM? Q2) Attempt any FOUR of the following : [16] a) What are the main reasons for using cellular system? b) Compare FDMA and TDMA. c) Why handover is needed in GSM? What are the different handover scenarios. d) What are the goals of Mobile IP? e) How does Indirect - TCP isolate problems on the wireless link? What are the main drawbacks of this isolation? P.T.O. Q3) Attempt any FOUR of the following : [16] a) Why has a scripting language been added to WML? How can this language help saving bandwidth and reducing delay? b) What are the main benefits of spread spectrum system? What are the advantages of DSSS over FHSS? c) Explain logical reference model of location services? d) What is reverse tunneling? Why it is needed? e) What are the advantages and disadvantages of Mobile TCP? Q4) Attempt any FOUR of the following : a) [16] Explain following optimizations : i) Fast Retransmit/Fast Recovery. ii) Transaction oriented TCP. b) What are the features of WSP/B? c) What are the constraints possible on Text Box? d) What are the different identifiers associated with mobile stations in GSM? Why these identifiers are required? e) Explain cellular IP with its advantages and disadvantages. Q5) Attempt any FOUR of the following : [16] a) Why CSMA | CD fails in wireless network? b) Explain network and switching subsystems. c) Why is routing in multihop ad-hoc network is complicated? d) Explain the architecture of WAP with diagram. e) List the entities of mobile IP and describe data transfer from a mobile node to a fixed node. Why and where encapsulation is needed? OR #### [3733]-302 2

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Additional Info : M.Sc. COMPUTER SCIENCE, CS -302 : Mobile Computing ( New & Old Course) (Semister - III), Pune University
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