MOBILE COMPUTING (MC) DECEMBER 2010 COMPUTER SCIENCE SEMESTER 7

MOBILE COMPUTING (MC) DECEMBER 2010 COMPUTER SCIENCE SEMESTER 7 

Con.6599-10                                   (REVISED COURSE)                         GT-8842

                                                                (3 Hours)                              [Total Marks :-100]

N.B.: (1) Question No.1 is compulsory.
         (2) Attempt any four questions out of remaining six questions.
         (3) Make suitable assumption wherever necessary and clearly justify them. 

Q.1 (a) Which components are new in GPRS as compared to GSM? What is their
             purpose? [5 Marks]
       (b) What are the general problems of Mobile IP regarding the support of quality of
             service? [5 Marks]
       (c) Compare IEEE 802.11, HIPERLAN-2 and Bluetooth with regard to their ad-hoc
            capability. [5 Marks]
       (d) What is the simple scheme to solve the hidden terminal problem in wireless
             network? [5 Marks] 
Q.2 (a) What are the main benefits of spread spectrum system? How can spreading be achieved?
             Explain the block diagram of FHSS transmitter and receiver. [10 Marks]
       (b) Elaborate on various handover mechanism in cellular system. [10 Marks]

Q.3 (a) Explain UMTS architecture and its domains. [10 Marks]
       (b) How power management is achieved in ad-hoc and infrastructure modes of WLAN
            (802.11)? [10 Marks]

Q.4 (a) Explain WATM reference model with several access scenarios. [10 Marks]
       (b) Why traditional TCP is not suitable for mobile environment?Discuss about strengths and
             weakness of indirect -TCP, Snooping-TCP and M-TCP. [10 Marks] 

Q.5 (a) Explain the tunneling mechanism of Mobile IP using IP-in-IP, minimal and generic
             routing encapsulation respectively. Discuss pros and cons of these three
             methods. [10 Marks]  
       (b) Explain protocol architecture of DECT. [10 Marks]

Q.6 (a) How can higher data rates be achieved in standard GSM using additional schemes HSCSD,
            GPRS and EDGE? What are the main differences of these approaches? [10 Marks]
       (b) List the services offered by 3G mobile systems. Discuss the architecture of wireless local
            loop (WLL). [10 Marks]

Q.7 Write short notes on any two: [20 Marks]
        (a) Capabilities of satellite in mobile communication.
        (b) Wireless Telephony application
        (c) Bluetooth protocol stack
        (d) HIPERLAN-2