Question 1Frequency 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 2Performance 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 3Mobility 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 4Performance 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 5There 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 6Paging 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 7HLR 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 8In 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 9In 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 10To 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 11In 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 12Possible radio propagation mechanisms include
| a. Line of sight |
| b. Reflection |
| c. Scattering |
| d. all of the above |
Question 13The 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 143G wireless systems include
| a. GSM and GPRS |
| b. GPRS and IS-95 |
| c. IS-95 and cdma2000 |
| d. cdma2000 and W-CDMA |
Question 15GSM 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 16BSC
| 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 17For 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 18The 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 19For 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 20Duplexing 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 |