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Emerging Wireless Technologies and the Future Mobile Internet

Answers to RF Cafe Quiz #39
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All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job.

Some of these books used in quizzes are available as prizes in the monthly RF Cafe Giveaway.

Note: Many answers contain passages quoted from the text.


Return to RF Cafe Quiz #39


RF Cafe Featured Book - Emerging Wireless Technologies and the Future Mobile InternetThis quiz is based on the information presented in Emerging Wireless Technologies and the Future Mobile Internet, by Dipankar Raychaudhuri & Mario Gerla. Published by Cambridge university Press. Note: Some of these books are available as prizes in the monthly RF Cafe Giveaway.


1.  According to a NSF Wireless Mobile Planning Group report, how is the usage scenario for Individual Wireless Devices Interfacing with the Internet classified?

b)  Mobile Computing.
This is designated "Scenario A," and includes cellular phones, PDAs, media players, digital cameras, or some type of combination consumer device.  (see page 11)




2.   According to a NSF Wireless Mobile Planning Group report, how is the usage scenario for Constellation of Wireless Devices classified?

a)  Ad hoc Nets
This is designated "Scenario B," and is motivated by a variety of settings in which multiple radio devices me be in close physical proximity and can collaborate by forming an ad hoc network.  (see page 11)




3.   According to a NSF Wireless Mobile Planning Group report, how is the usage scenario for Pervasive Systems and Sensors Networks classified?

c)  Server Nets
This is designated "Scenario C," and refers to a broad class of systems involving embedded wireless devices connected to the Internet.  (see page 12)




4.  What does the IEEE 802.11 WAVE Task Group specification cover?

b)  Data exchange between high speed vehicles and roadside infrastructure
Wireless Access in Vehicular Environments (WAVE) uses the licensed 5.9 GHz ITS (Intelligent Transportation Systems) band.  (see page 23)




5.  What is the function of a protocol's MAC layer?

d)  Brokering of channel access between contending devices
The Media Access Control layer's job is to facilitate the most efficient communications between connected devices  (see page 58)




6.  A Delay/Disruption Tolerant Network (DTN) might use what part of the network?

d)  All the above
In the DTN system, any fixed or mobile platform equipped with proper hardware can act as a transponder to help form continuous wireless communications.  (page 71)




7.  What is the name given to a scheme that uses interface components to translate data at the boundaries of large networks?

c)  Gluenet
The term Gluenet refers to using all components of the DTN (see Q6) to provide coverage at teh boundaries of major cells.  (see page 84)




8.  Which of these components might make up a Wireless Sensor Network (WSN)?

d)  All the above
Wireless Sensor Networks are an important emerging class of embedded distributed systems that consist of low-power devices integrating computation, sensing, and wireless communications.  (see page 125)




9.  What is a major limitation of Software Defined Radio (SDR) in cognitive radio networks?

a)  Latency
The significant delay and jitter between radio hardware and the host CPU will impact a host-based cognitive radio network protocol's ability to react quickly to the spectrum, and for the MAC layer to precisely control packet timing.  (see page 182)




10.  Which factor(s) is(are) unique to wireless environments versus wired environments?

Wireless networks experience data transfer issues because of a continuously varying environment.  (see page 287)
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