Mobile computing refers to the use of portable devices, such as smartphones, tablets, and laptops, to access and process data wirelessly while on the move. It enables users to stay connected, work, and access information from anywhere through technologies like Wi-Fi, cellular networks, and Bluetooth. Mobile computing integrates hardware, software, and communication technologies to provide seamless connectivity, real-time data exchange, and applications like mobile banking, navigation, and cloud services. It has revolutionized how people interact with technology, making it more accessible and convenient.
23 questions and answers
What is hand-off? What are the different hand-off strategies? Discuss the merits and demerits of each such strategy?
A handoff refers to the process of transferring an active call or data session from one cell in a cellular network to another or from one channel in a cell to another.
What are hidden station problem and exposed station problem in WLAN? How are the problems solved?
B is sending data to A, and after some time C also wants to send data to B. but C is not in the range of B and so it will be unaware of the transmission between B and A,
What is WAP? Why it is used?
Wireless Application Protocol (WAP) is a technical standard for accessing information over a mobile wireless network.
What is multiple access technique? Do a comparative study among FDMA,TDMA and CDMA.
Multiple Access Techniques are techniques to access a single channel by multiple users. They provide multiple access to the channel. A “channel” refers to a system resource allocated to a given mobile user enabling the user to establish communication with the network (other users).
Write short note on
Iridium satellite system
Wireless local loop (WLL), is the use of a wireless communications link as the "last mile / first mile" connection for delivering plain old telephone service (POTS) or Internet access (marketed under the term "broadband") to telecommunications customers.
Define WLAN. Illustrate the system architecture of IEEE802.11 WLAN. Explain with diagram the protocol architectures and manage of IEEE 802.11.
WLAN (wireless local area network) is a local area network without wires. Mobile users can access information and network resources through WLAN as they are moving from one place to another. It is implemented as an extension of wired LAN within a building or campus.
Define the following terms and state their usage.
The near-far problem is a condition in which a receiver captures a strong signal and thereby makes it impossible for the receiver to detect a weaker signal.
Write short note on Call setup of GSM network for mobile-to-mobile call.
GSM (Global System for Mobile Communications), is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for second generation (2G) digital cellular networks used by wireless phones.
What is spread spectrum technique? Name two standard spread spectrum techniques and state the main difference in their principles of operation.
Spread-spectrum techniques are methods by which an electrical, electromagnetic, or acoustic signal generated with a particular bandwidth is deliberately spread in the frequency domain,
What are tunnelling and encapsulation in the context of mobile IP?
The encapsulation process creates a logical construct called a tunnel between the device that encapsulates and the one that decapsulates.
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