CS 898T Mobile and Wireless Networks - Homework 3 - Name:_________________

    Assigned: Wednesday, March 31 
    Due: Monday, April 12 (in class)

    Please show all work on a separate sheet attached to this sheet.
    For each question write key points. 

    (50 points - 10 points for each question) 


    1. Give reasons for a handover in GSM and the problems associated
       with it. What are the typical steps for handover, what types
       of handover can occur? Which resources need to be allocated
       during handover for data transmission using HSCSD or GPRS
       respectively? What about QoS guarantees?


    2. How can higher data rates be achieved in standard GSM, how is
       this possible with the additional schemes HSCSD, GPRS, EDGE?
       What are the main differences of the approaches, also in terms
       of complexity? What problems remain even if the data rate is
       increased?


    3. Compare the current situation of mobile phone networks in Europe,
       Japan, China, and North America. What are the main differences,
       what are efforts to find a common system or at least interoperable
       systems?


    4. With a focus on security, what are the problems of WLANs? What
       level of security can WLANs provide, what is needed additionally
       and how far do the standards go?


    5. Compare 802.11b and 802.11g.