Question 1 Frequency reuse concept is used in
a. FDMA and TDMA systems
b. TDMA and CDMA systems
c. CDMA and FDMA systems
d. all of the above
Question 2 Performance measures of call admission control include
a. new call blocking probability
b. new call arrival rate
c. handoff rate
d. none of the above
Question 3 Mobility management covers
a. handoff management and power management
b. power management and location management
c. location management and handoff management
d. none of the above
Question 4 Performance metrics of handoff designs include
a. new call blocking probability, handoff call blocking probability and handoff rate
b. call dropping probability, handoff call blocking probability and successful call duration
c. call dropping probability, new call blocking probability and successful call duration
d. call dropping probability, handoff rate and successful call duration
Question 5 There are several handoff types
a. In hard handoff, a CDMA MS connects to two or more BS's at a given time
b. In a two-way softer handoff, a CDMA MS connects to two BS's
c. In soft handoff, a TDMA MS connects to two or more BS's
d. none of the above statements is correct
Question 6 Paging messages are sent from BS to MS
a. To minimize delay, cells are divided into groups and page one group at a time
b. To minimize paging traffic, page all cells at the same time
c. To minimize paging traffic, MS should send less frequent location updates
d. none of the above statements is correct
Question 7 HLR and VLR
a. Most of subscriber information are found in VLR
b. Paging areas are determined by the location of HLR rather than the location of VLR
c. To deliver a call to a MS, signaling message goes to HLR first then VLR
d. none of the above statements is correct
Question 8 In wireless multiple access,
a. collision avoidance is preferred rather than collision detection
b. collision detection is preferred rather than collision avoidance
c. both collision avoidance and collision detection are important
d. neither collision avoidance and collision detection can be implemented
Question 9 In a wireless network, a TCP packet can be lost due to
a. wireless channel errors
b. network congestion
c. handoff delay
d. all of the above
Question 10 To handle packet routing, the following information is required
a. network topology
b. network traffic status
c. network link costs
d. all of the above
Question 11 In Mobile IP, each mobile
a. has a permanent IP address
b. has a temporary IP address associated with its visiting BS
c. uses the IP address of its home agent
d. uses both its home agent IP address and its foreign agent IP address
Question 12 Possible radio propagation mechanisms include
a. Line of sight
b. Reflection
c. Scattering
d. all of the above
Question 13 The following wireless TCP protocol is asymmetric over wireless link in terms of transmission power and bandwidth
a. I-TCP
b. AIRMAIL
c. SNOOP
d. none of the above
Question 14 3G wireless systems include
a. GSM and GPRS
b. GPRS and IS-95
c. IS-95 and cdma2000
d. cdma2000 and W-CDMA
Question 15 GSM and IS-95
a. GSM is based on FDMA and IS-95 is based on CDMA
b. GSM is based on TDMA and IS-95 is based on CDMA
c. GSM is based on FDMA and IS-95 is based on TDMA
d. GSM is based on TDMA and IS-95 is based on TDMA
Question 16 BSC
a. receives radio signals from MS's
b. transmits radio signals to MS's
c. performs radio channel allocation
d. acts as an agent for roaming MS's
Question 17 For modulation schemes,
a. GSM uses BPSK/QPSK and IS-95 uses GMSK
b. GSM uses GMSK and IS-95 uses BPSK/QPSK
c. GSM and IS-95 use BPSK/QPSK
d. GSM and IS-95 use GMSK
Question 18 The main purpose of power control in CDMA is to
a. minimize interference
b. save transmit power
c. enhance code orthogonality
d. none of the above
Question 19 For the three basic ARQ schemes
a. SW is more efficient than GBN
b. GBN is more efficient than SR
c. SR is more efficient than SW
d. none of the above statements is correct
Question 20 Duplexing versus multiple access
a. TDD and FDMA are used to accomplish the same task
b. TDD and TDMA are used to accomplish the same task
c. FDD and TDMA are used to accomplish the same task
d. none of the above statements is correct
Question 21 A wireless system can be noise-limited or interference-limited
a. Range-limited scenario is closely related to interference levels
b. Coverage-limited scenario is closely related to noise levels
c. Interference-limited scenario is closely related to noise levels
d. none of the above statements is correct
Question 22 In call admission control, guard channel scheme is introduced to
a. minimize handoff call dropping probability
b. minimize new call blocking probability
c. maximize channel utilization
d. all of the above
Question 23 For a given number of channels, to reduce the new call blocking probability,
a. the number of guard channels should be increased
b. the number of guard channels should be reduced
c. the number of guard channels is irrelevant
d. none of the above statements is correct
Question 24 Call dropping probability is calculated based on information such as
a. new call request failure due to lack of available channels
b. a call handoff to another cell
c. handoff call request failure due to lack of available channels
d. all of the above
Question 25 To achieve dynamic channel allocation,
a. channels can be shared within a cell
b. channels can be shared among different cells
c. channels can be shared among different clusters
d. none of the above statements is correct