Let’s be honest: in standard networking, you have the luxury of a physical cable. In Wireless and Mobile Computing, your medium is literally thin air—and air is a messy, unpredictable place. Between signal fading, multipath interference, and the sheer logistical nightmare of keeping a connection stable while a user is moving at 100 km/h, this subject can make even the brightest students feel a bit “disconnected.”
Below is the exam paper download link
Past Paper On Wireless And Mobile Computing For Revision
Above is the exam paper download link
If you’re staring down an upcoming exam, you’ve likely realized that memorizing “G” generations (3G, 4G, 5G) isn’t enough. Your examiners want to know about the physics of the signal, the efficiency of the MAC layer, and the logic behind cellular handoffs.
To help you get your signal strength back to 100%, we’ve tackled the big questions that show up year after year. Plus, there is a direct link to download a full Wireless and Mobile Computing past paper at the bottom of this page.
Your Wireless Revision: The Questions That Actually Matter
Q: What is “Frequency Reuse,” and why is the hexagonal cell shape so important?
Spectrum is expensive and limited. You can’t give every user their own unique frequency. Frequency Reuse allows us to use the same frequencies in different geographic areas (cells). We use a hexagonal grid in exams because it’s the simplest shape that covers an entire area without gaps or overlaps, making it much easier to calculate the distance between co-channel cells.
Q: What is a “Handoff” (or Handover), and what happens when it fails?
A handoff occurs when a mobile device moves from one base station’s coverage area to another. A Hard Handoff (“break-before-make”) drops the old connection before picking up the new one, common in FDMA/TDMA. A Soft Handoff (“make-before-break”) connects to the new station before releasing the old one, which is much smoother but resource-heavy. If the “Target Cell” has no free channels, the call is simply dropped.
Q: How does CSMA/CA differ from the CSMA/CD used in wired Ethernet?
In a wire, you can “detect” a collision ($CD$) by listening for voltage spikes. In wireless, you can’t listen while you’re talking because your own signal drowns everything else out. Instead, we use Collision Avoidance ($CA$). Devices send a “Request to Send” ($RTS$) and wait for a “Clear to Send” ($CTS$) before transmitting. This solves the famous “Hidden Terminal Problem.”
Q: Why is “Multipath Propagation” considered both a curse and a blessing?
It’s a curse because signals reflect off buildings and mountains, arriving at your phone at slightly different times and causing interference (fading). It’s a blessing because modern technology like MIMO (Multiple Input Multiple Output) actually uses these different paths to send more data at once, significantly boosting speed.
Strategy: How to Use the Past Paper for Maximum Gain
Don’t just skim the PDF and think you’ve got it. Wireless exams often require “back-of-the-envelope” math and diagramming.
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The Modulation Challenge: Look at the questions regarding QAM, PSK, or FSK. Practice drawing the constellation diagrams. If the paper asks about 16-QAM, do you know how many bits per symbol that represents?
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The TCP/IP over Wireless Gap: Be ready to explain why standard TCP performs poorly on wireless. (Hint: TCP thinks packet loss is due to “congestion” and slows down, but in wireless, loss is usually just a bad signal).
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The 5G Architecture: Make sure you can explain the difference between mmWave (high speed, short range) and Sub-6 GHz (lower speed, better coverage).
Ready to Master the Airwaves?
Wireless computing is the foundation of the modern world, from your smartphone to the sensors in a smart city. Mastering the theory is the only way to understand how these invisible networks stay standing.
We’ve curated a comprehensive revision paper that covers everything from Mobile IP and WAP to Ad-hoc networks (MANETs) and Satellite communication.
