WLS 7081Kris

Global System for Mobiles

Questions & Answers

  1. GSM was developed in 1980s, and GSM standard was agreed upon by all participating countries in ______.
  2. 1985
  3. 1987
  4. 1991
  5. 1995
  6. None of the above
  1. The principle technologies incorporated in the GSM signaling specifications are:
  2. ISDN
  3. X.25
  4. SS7
  5. In band signaling
  6. All of the above
  1. The data base not specified in GSM is:
  2. HLR
  3. VLR
  4. AuR
  5. EIR
  6. All of the above
  1. By removing the SIM, the GSM subscriber disables the telephone with the exception of an ability to place emergency calls.
  2. True
  3. False
  1. Kc (Cipher key) is at the heart of GSM security and privacy operations and is stored in SIM and in the subscribers home system.
  2. True
  3. False
  1. Within the Network Switching System NSS, the switching functions are performed by the ______.
  2. VLR
  3. HLR
  4. BSC
  5. MSC
  6. PSTN
  1. HLR is the functional unit that dynamically stores the subscriber info such as location area, when the subscriber is located in the area covered by the MSC.
  2. True
  3. False
  1. For providing security and validation, the Equipment identity Register EIR is accessed by the VLR to determine whether an MS will be granted service.
  2. True
  3. False
  1. The bandwidth per channel in the GSM
  2. 10 kHz
  3. 25 kHz
  4. 30 kHz
  5. 200 kHz
  6. 1.25 KHz
  1. The Fuplink and Fdownlink for GSM channel N = 11 iare: given by
  2. 890.0, and 935.0 MHz
  3. 890.2, and 935.2 MHz
  4. 935.2, and 890.2 MHz
  5. 892.2, and 937.2 MHz
  6. None of the above
  1. Broadcast Channels (BCHs) are point to multipoint down link only channels.
  2. True
  3. False
  1. The ______control channels are used to page mobile stations.
  2. AGCH
  3. SDCCH
  4. PCH
  5. RACH
  6. ACCH
  1. The ______are bidirectional, point-to-point channels and are used to send out of band signaling and control data between the MS and the BS or to send transmission timing info from the BS to the MS.
  2. AGCH
  3. SDCCH
  4. PCH
  5. RACH
  6. ACCH
  1. The GSM time slot is equal to 0.58 ms and consists of user data ______bits.
  2. 8.25
  3. 114
  4. 156.25
  5. 1250
  6. None of the above
  1. The GSM multi frame is 120 ms and consists of 52 frames.
  2. True
  3. False
  1. The delay equalization process in the receiver is to compensate for the spread in time delays resulting from multipath propagating.
  2. True
  3. False
  1. The speech is sampled at the rate of 8000 samples per second, uniformly quantized and coded using 8 bits per sample.
  2. True
  3. False
  1. The full rate speech encoder outputs 260 bits over the 20 ms period, of which RPE excitation signal bits are:
  2. 9
  3. 36
  4. 47
  5. 188
  6. None 0f the above
  1. Interleaved data is passed though the GMSK modulator where it filtered by a ______filter applying it to a modulator.
  2. Cosine
  3. Root raised Cosine
  4. Gaussian
  5. Raleigh
  6. None of the above
  1. GSM uses GMSK modulation scheme a derivative of MSK, where in the side lobe levels are increased by the passing through a pre modulation pulse-shaping filter.
  2. True
  3. False
  1. List the sequential steps involved in paging a mobile.