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Revision for Chapter 3-4

Revision for Chapter 3-4. In Explicit Reservation (Reservation Aloha), collisions is possible in: ALOHA mode Reserved mode Both modes.

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Revision for Chapter 3-4

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  1. Revision for Chapter 3-4

  2. In Explicit Reservation (Reservation Aloha), collisions is possible in: • ALOHA mode • Reserved mode • Both modes

  3. A starts sending to B, C does not receive this transmission. C also wants to send something to B and senses the medium. The medium appears to be free, the carrier sense fails. C also starts sending causing a collision at B. • Hidden terminals • Exposed terminals • Near and far terminals

  4. Multinumberingin GSM is an example of: • Bearer Services • Telematic Services • Supplementary Services

  5. In GSM, which of the following is NOT part of the Operation Subsystem (OSS) • Operation and Maintenance Center (OMC) • Authentication Center (AUC) • Home Location Register (HLR) • Equipment Identity Register (EIR)

  6. In Base Station Subsystem (BSS) of GSM: • Each Base Station Controller (BSC) is connected to only one Base Transceiver Station (BTS). • Each Base Station Controller (BSC) is connected to many Base Transceiver Stations (BTS). • Each Base Transceiver Station (BTS) is connected to many Base Station Controllers (BSC).

  7. The International Mobile Subscriber Identity (IMSI) • Uniquely identifies the mobile device • Uniquely identifies the Subscriber Identity Module (SIM card) • Used to hide the identity of the user for security purposes

  8. Which of the following is considered an internal handover: • transferring a call between cells within the same BSS • transferring a call between cells within the same MSC • transferring a call between cells within different MSCs

  9. Which of the following is used to transmit user data • Traffic channels (TCH) • Common control channel (CCCH) • Dedicated control channel (DCCH)

  10. Handover decision is based on: • Received signal strength • Distance of MS from BTS • Drops below power budget margin • All of the above

  11. The VLR contains data from: • HLR of the same provider • HLR of other providers • Both A and B are correct

  12. Power control is very important in wireless networks to solve: • hidden terminal problem • exposed terminal problem • near & far terminals problem

  13. Devise a frequency division duplex scheme that allocated the frequency band 500 – 600 MHz to 200 users. What will be the bandwidth available for each user? Assume a guard of 20 MHz is required between the uplink and downlink connections • 200 KHz • 400 KHz • 500 KHz

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