B.E. (Computer) MOBILE COMPUTING (Sem. -1) (2008 Pattern) (Elective-II)
Time :3 Hours] [Max. Marks :100
Instructions to the candidates:-
1) Answer 3 questions from Section I and 3 questions from Section II.
2) Answer to each section should be written in separate books.
3) Neat diagrams must be drawn wherever necessary.
SECTION – I
QIA a) Explain the following in GSM context.
i) Justify why phased implementation has been adopted for GSM.
ii) State main objectives of future PLMTS.  b) Explain the operational requirement of GSM. 
Q2) a) Define the following terms : IMEI, IMSI, TMSI, SIM. 
b) Narrate the distinction between the following service areas :
GSM, PLMN, MSC, LA and cells. 
Q3) a) What are the messages (information) transmitted over BCCH, FCCH and SCH? Justify why hopping cannot be used for these channels. 
b) List different logical channels and their associated functions. 
Q4) a) State reasons for using a dummy burst over the air. 
b) What are the TDMA standards and applications ? 
Q5) a) Why initialization is necessary for mobile after the power is turned on? 
b) What are different cases of handovers? Draw the signal and response diagram. 
Q6) a) Define the functions performed within the following procedures. 
ii) Encryption and Ciphering
iii) Call clearing
iv) IMSI attach and detach
v) Location update
b) Name three distinct states of the mobiles. What functions must mobile perform in these states. 
SECTION – II
Q7) a) For what reason is the PIN number is used? What is its main purpose?  b) Explain four different types of security services provided by GSM. 
Q8) a) Explain the various components of information security. 
b) Explain the Symbian OS architecture? 
Q9) a) Compare Spectrum efficiency of CDMA with FDMA. 
b) Name the three classes of handover. What are the two modes of
QIO) a) Differentiate CDMA and TDMA. 
b) Explain both the spread spectrum technologies. 
QII) a) Explain MAP protocols for basic services support. 
b) Enumerate the basic function of MM,CC, RR layers. Illustrate with some
Q12) a) What is the main purpose of TMSI reallocation? 
Define the terms: primitives, entity, SAP and procedure.