Wireless and Mobile Communications: Cell Capacity and Reuse
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Questions and Answers

What is the primary reason for dividing the total number of channels into smaller groups and allocating them to neighboring base stations?

  • To increase transmission power
  • To increase the number of users per cell
  • To reduce the number of base stations
  • To minimize interference (correct)
  • What is the term used to describe the process of transferring a call from one cell to another?

  • Cell reuse
  • Handoff (correct)
  • Channel allocation
  • Frequency hopping
  • Which cell type is typically used to provide temporary coverage in areas with high demand or to replace downed cell towers?

  • Cell site in a truck (correct)
  • Picocell
  • Microcell
  • Femtocell
  • What is the primary advantage of using smaller cells, such as microcells or picocells?

    <p>Reduced interference</p> Signup and view all the answers

    What is the shape of a cell in a cellular network, and why is it preferred?

    <p>Hexagon, due to the efficient use of space</p> Signup and view all the answers

    What is the maximum Effective Radiated Power (ERP) of a base station in rural areas?

    <p>500 W</p> Signup and view all the answers

    What is the primary purpose of a selective-cell located at the entrance of a tunnel?

    <p>To provide coverage for a small cellular area</p> Signup and view all the answers

    What is the main advantage of Dynamic Channel Assignment over Fixed Channel Assignment?

    <p>It allows for more efficient use of voice channels</p> Signup and view all the answers

    In a cellular system, what is the primary function of the Forward Voice Channel (FVC)?

    <p>To transmit voice from the BS to the MS</p> Signup and view all the answers

    What is the primary concern when implementing a Channel Assignment scheme in a cellular system?

    <p>Minimizing interference between cells</p> Signup and view all the answers

    In a cellular system, what is the primary effect of a cell borrowing channels from its neighboring cell?

    <p>It reduces the number of blocked calls</p> Signup and view all the answers

    What is the primary characteristic of a pico-cell in a cellular system?

    <p>It covers a small cellular area</p> Signup and view all the answers

    What is the total number of simultaneous calls that can be made in the 28 cells of the given cell map?

    <p>14,000</p> Signup and view all the answers

    What is the bandwidth of each simplex channel in the given FDD cellular system?

    <p>25 KHz</p> Signup and view all the answers

    What is the number of channels per cell for a seven-cell reuse pattern in the given FDD cellular system?

    <p>95 channels</p> Signup and view all the answers

    What is the primary purpose of using micro-cells in a cellular network?

    <p>To reduce interference with cells in other clusters</p> Signup and view all the answers

    What is the reuse factor (N) in a cellular system that uses 250 channels per cluster?

    <p>4</p> Signup and view all the answers

    What is the diameter of the coverage area of a macro-cell in a cellular system?

    <p>6 miles</p> Signup and view all the answers

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