Virtual Labs

Handoff

1. What is the main aim of this experiment?

a: To measure the maximum speed of a mobile user. Explanation

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b: To understand the process of transferring an active call between cells. Explanation

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c: To calculate the total call drop probability for the entire network. Explanation

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d: To study the SINR for a user who is not moving. Explanation

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2. What is a 'handover' in a mobile network?

a: The process of starting a new call. Explanation

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b: The process of ending a call. Explanation

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c: The process of switching a call from a voice channel to a data channel. Explanation

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d: The process of transferring an ongoing call from one base station to another. Explanation

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3. According to the objectives, what two parameters are being studied for their effect on handover?

a: Call duration and user speed. Explanation

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b: Handover threshold and handover margin. Explanation

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c: SINR and call drop probability. Explanation

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d: Base station height and transmit power. Explanation

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4. What is the 'handover threshold'?

a: A signal quality level that, when dropped below, might trigger a handover. Explanation

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b: The maximum number of handovers allowed in one call. Explanation

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c: The physical boundary between two cells. Explanation

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d: The minimum data speed required to maintain a call. Explanation

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5. What is the 'handover margin' designed to prevent?

a: Users from making calls. Explanation

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b: The call from dropping due to a very strong signal. Explanation

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c: Unnecessary handovers back and forth between two cells (ping-pong effect). Explanation

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d: The SINR from ever getting too high. Explanation

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6. Setting a very **low** handover margin would likely lead to:

a: Fewer handovers and a higher call drop probability. Explanation

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b: Fewer handovers and a lower call drop probability. Explanation

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c: More handovers and a higher call drop probability. Explanation

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d: More handovers (ping-pong) but a lower call drop probability. Explanation

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7. Setting a very **high** handover margin would likely lead to:

a: Fewer handovers, but an increased call drop probability. Explanation

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b: Fewer handovers and a decreased call drop probability. Explanation

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c: More handovers, but a decreased call drop probability. Explanation

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d: More handovers and an increased call drop probability. Explanation

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8. What is 'call drop probability'?

a: The chance that a user will hang up the phone. Explanation

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b: The chance that a new call cannot be started. Explanation

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c: The chance that an ongoing call is involuntarily terminated. Explanation

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d: The chance that a handover will happen. Explanation

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9. How does SINR (Signal-to-Interference-plus-Noise Ratio) relate to this experiment?

a: The experiment studies how handover settings affect the SINR. Explanation

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b: The experiment aims to keep the SINR at zero. Explanation

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c: SINR is a measure of call cost, not quality. Explanation

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d: A high SINR is the main reason for call drops. Explanation

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10. What is 'handover probability'?

a: The likelihood that a call will be dropped. Explanation

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b: The likelihood that a call will be successfully started. Explanation

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c: The likelihood that a handover event will occur. Explanation

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d: The likelihood that the SINR is good. Explanation

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